Class: Source::Bibtex

Inherits:

Source

Object
ActiveRecord::Base
ApplicationRecord
Source
Source::Bibtex

show all

Extended by:: SoftValidationExtensions::Klass

Includes:: Shared::OriginRelationship, SoftValidationExtensions::Instance

Defined in:: app/models/source/bibtex.rb

Overview

Bibtex - Subclass of Source that represents most references.

Cached values are formatted using the 'zootaxa' style from 'csl/styles'

TaxonWorks(TW) relies on the bibtex-ruby gem to input or output BibTeX bibliographies, and has a strict list of required fields. TW itself only requires that :bibtex_type be valid and that one of the attributes in TW_REQUIRED_FIELDS be defined. This allows a rapid input of incomplete data, but also means that not all TW Source::Bibtex objects can be added to a BibTeX bibliography.

The following information is taken from BibTeXing, by Oren Patashnik, February 8, 1988 ftp.math.purdue.edu/mirrors/ctan.org/biblio/bibtex/contrib/doc/btxdoc.pdf (and snippets are cut from this document for the attribute descriptions)

BibTeX fields in a BibTex bibliography are treated in one of three ways:

REQUIRED: Omitting the field will produce a warning message and, rarely, a badly formatted bibliography entry. If the required information is not meaningful, you are using the wrong entry type. However, if the required information is meaningful but, say, already included is some other field, simply ignore the warning.
OPTIONAL: The field's information will be used if present, but can be omitted

without causing any formatting problems. You should include the optional
     field if it will help the reader.

IGNORED: The field is ignored. BibTEX ignores any field that is not required or

optional, so you can include any fields you want in a bib file entry. It's a

good idea to put all relevant information about a reference in its bib file
entry - even information that may never appear in the bibliography.

Dates in Source Bibtex:

It is common for there two be two (or more) dates associated with the origin of a source:
  1) If you only have reference to a single value, it goes in year (month, day)
  2) If you have reference to two year values, the actual year of publication goes in year, and the stated year of publication goes in stated_year.
  3) If you have month or day publication, they go in month or day.

We do not track stated_month or stated_day if they are present in addition to actual month and actual day.

BibTeX has month.
BibTeX does not have day.

Author:

Elizabeth Frank <eef@illinois.edu> INHS University of IL
Matt Yoder

Defined Under Namespace

Modules: SoftValidationExtensions

Constant Summary collapse

DEFAULT_CSL_STYLE = Type will change

'taxonworks'

GRAPH_ENTRY_POINTS =

[:origin_relationships]

BIBTEX_REQUIRED_FIELDS = Used in soft validation

{
  article: [:author, :title, :journal, :year],
  book: [:author, :editor, :title, :publisher, :year],
  booklet: [:title],
  conference: [:author, :title, :booktitle, :year],
  inbook: [:author, :editor, :title, :chapter, :pages, :publisher, :year],
  incollection: [:author, :title, :booktitle, :publisher, :year],
  inproceedings:  [:author, :title, :booktitle, :year],
  manual: [:title],
  mastersthesis: [:author, :title, :school, :year],
  misc: [],
  phdthesis: [:author, :title, :school, :year],
  proceedings: [:title, :year],
  techreport: [:author,:title,:institution, :year],
  unpublished: [:author, :title, :note]
}

TW_REQUIRED_FIELDS = TW required fields (must have one of these fields filled in) either year or stated_year is acceptable

[:author, :editor, :booktitle, :title, :url, :journal, :year, :stated_year].freeze

IGNORE_SIMILAR =

[:verbatim, :cached, :cached_author_string, :cached_nomenclature_date].freeze

IGNORE_IDENTICAL =

IGNORE_SIMILAR.dup.freeze

Instance Attribute Summary collapse

#abstract ⇒ String
#address ⇒ #String^?

BibTeX standard field (optional for types: book, inbook, incollection, inproceedings, manual, mastersthesis, phdthesis, proceedings, techreport) Usually the address of the publisher or other type of institution.
#annote ⇒ String^?

BibTeX standard field (ignored by standard processors) An annotation.
#author ⇒ String^?

“Last name, FirstName MiddleName”.
#authors_to_create ⇒ Object

DEFAULT_CSL_STYLE = 'zootaxa'.
#bibtex_type ⇒ String

One of VALID_BIBTEX_TYPES (config/initializers/constants/_controlled_vocabularies/bibtex_constants.rb, keys there are symbols).
#booktitle ⇒ nil

@return the title of the book BibTeX standard field (required for types: )(optional for types:) A TW required attribute (TW requires a value in one of the required attributes.) Title of a book, part of which is being cited.
#chapter ⇒ String^?

BibTeX standard field (required for types: )(optional for types:) A chapter (or section or whatever) number.
#copyright ⇒ String
#crossref ⇒ nil

@return the key of the cross referenced source BibTeX standard field (ignored by standard processors) The database key(key attribute) of the entry being cross referenced.
#day ⇒ Integer

the actual publication month, NOT a BibTex standard field If day is present there must be a month and day must be valid for the month.
#doi ⇒ String
#edition ⇒ nil

@return the edition of the book BibTeX standard field (required for types: )(optional for types:) The edition of a book(for example, “Second”).
#editor ⇒ String
#howpublished ⇒ nil

@return a description of how this source was published BibTeX standard field (required for types: )(optional for types:) How something unusual has been published.
#institution ⇒ nil

@return the name of the institution publishing this source BibTeX standard field (required for types: )(optional for types:) The sponsoring institution of a technical report.
#isbn ⇒ String
#issn ⇒ String
#journal ⇒ Array

Journal, nil or name.
#key ⇒ String^?

BibTeX standard field (may be used in a bibliography for alphabetizing & cross referencing) Used by bibtex-ruby gem method identifier as a default value when no other identifier is present.
#language ⇒ String

BibTeX field for the name of the language used.
#language_id ⇒ Integer

Language, from a controlled vocabulary.
#month ⇒ nil

@return The three-letter lower-case abbreviation for the month in which this source was published.
#note ⇒ nil

@return the BibTeX note associated with this source BibTeX standard field (required for types: unpublished)(optional for types:) Any additional information that can help the reader.
#number ⇒ nil

@return the number in a series, issue or technical report number associated with this source BibTeX standard field (required for types: )(optional for types:) The number of a journal, magazine, technical report, or of a work in a series.
#organization ⇒ nil

@return the organization associated with this source BibTeX standard field (required for types: )(optional for types:) The organization that sponsors a conference or that publishes a manual.
#pages ⇒ String

BibTeX standard field (required for types: )(optional for types:) One or more page numbers or range of numbers, such as 42–111 or 7,41,73–97 or 43+ (the `+' in this last example indicates pages following that don't form a simple range).
#publisher ⇒ String
#school ⇒ String
#series ⇒ String
#stated_year ⇒ String
#title ⇒ String

A TW required attribute (TW requires a value in one of the required attributes.).
#translator ⇒ String

bibtex-ruby gem supports translator, it's not clear whether TW will or not.
#type ⇒ String
#url ⇒ String

A TW required attribute for certain bibtex_types (TW requires a value in one of the required attributes.).
#verbatim ⇒ String

Non-Bibtex attribute that is cross-referenced.
#verbatim_contents ⇒ String
#verbatim_keywords ⇒ String
#volume ⇒ String
#year ⇒ Integer

the actual publication year.
#year_suffix ⇒ String

Like 1950a.

Attributes inherited from Source

#cached, #cached_author_string, #no_year_suffix_validation, #serial_id

Attributes included from Housekeeping::Users

#by

Class Method Summary collapse

.bibtex_author_to_person(bibtex_author) ⇒ Person, Boolean

New person, or false.
.new_from_bibtex(bibtex_entry = nil) ⇒ Source::BibTex.new

Instantiates a Source::Bibtex instance from a BibTeX::Entry Note: * note conversion is handled in note setter.
.new_from_bibtex_text(text = nil) ⇒ BibTeX::Entry

Instance Method Summary collapse

#author_year ⇒ String

A string that represents the authors last_names and year (no suffix).
#authority_name(reload = true) ⇒ String^?

Last names formatted as displayed in nomenclatural authority (iczn), prioritizes normalized People before BibTeX `author` !! This is NOT a legal BibTeX format !!.
#bibtex_bibliography ⇒ BibTex::Bibliography

Initialized with this Source as an entry.
#cached_nomenclature_date ⇒ Date || Time

<sigh> An memoizer, getter for cached_nomenclature_date, computes if not .persisted?.
#cached_string(format = 'text') ⇒ String

String must be length > 0.
#check_has_field ⇒ Ignored protected

must have at least one of the required fields (TW_REQUIRED_FIELDS).
#create_authors ⇒ Ignored protected
#create_related_people_and_roles ⇒ Array, Boolean

TODO: Not used.
#get_author ⇒ String^?

Priority is Person, string !! Not the cached value !!.
#get_bibtex_names(role_type) ⇒ String protected

The BibTeX version of the name strings created from People BibTeX format is 'lastname, firstname and lastname, firstname and lastname, firstname' This only references People, i.e.
#get_cached ⇒ Object protected
#has_authors? ⇒ Boolean

is there a bibtex author or author roles?.
#has_editors? ⇒ Boolean
#has_some_year? ⇒ Boolean
#has_writer? ⇒ Boolean

True contains either an author or editor.
#identifier_string_of_type(type_value) ⇒ Identifier

The identifier of this type, relies on Identifier to enforce has_one for Global identifiers !! behaviour for Identifier::Local types may be unexpected.
#italics_are_paired ⇒ Object protected
#nomenclature_year ⇒ Integer

The effective year of publication as per nomenclatural rules.
#render_with_style(style = 'vancouver', format = 'text', normalize_names = true) ⇒ String

This source, rendered in the provided CSL style, as text.
#serial_id(value) ⇒ Fixnum^?

Non-Bibtex attribute that is cross-referenced.
#set_cached ⇒ Ignored protected

TODO: Replace with taxonworks.csl.
#sv_cached_names ⇒ Object protected

this cannot be moved to soft_validation_extensions.
#to_bibtex ⇒ BibTeX::Entry, false

rubocop:disable Metrics/MethodLength.
#to_citeproc(normalize_names = true) ⇒ Object

Hash a to_citeproc with values updated for literal handling via `{}` in TaxonWorks.
#url_as_uri ⇒ URI

turn bibtex URL field into a Ruby URI object.
#valid_bibtex? ⇒ Boolean

Whether the BibTeX::Entry representation of this source is valid.
#validate_year_suffix ⇒ Object protected
#verbatim_journal ⇒ String
#year_with_suffix ⇒ String

A string that represents the year with suffix as seen in a BibTeX bibliography.

Methods included from SoftValidationExtensions::Instance

#sv_contains_a_writer, #sv_duplicate_title, #sv_has_authors, #sv_has_booktitle, #sv_has_chapter_or_pages, #sv_has_institution, #sv_has_note, #sv_has_publisher, #sv_has_school, #sv_has_some_type_of_year, #sv_has_title, #sv_has_year, #sv_is_article_missing_journal, #sv_match_fields?, #sv_missing_roles

Methods included from Shared::OriginRelationship

#new_objects, #old_objects, #reject_origin_relationships, #set_origin

Methods inherited from Source

batch_create, batch_preview, #cited_objects, #clone, #is_bibtex?, #is_in_project?, #nomenclature_date, #reject_project_sources, select_optimized, #sv_fix_cached_names, used_recently

Methods included from SoftValidation

#clear_soft_validations, #fix_for, #fix_soft_validations, #soft_fixed?, #soft_valid?, #soft_validate, #soft_validated?, #soft_validations, #soft_validators

Methods included from Shared::HasPapertrail

#attribute_updated, #attribute_updater

Methods included from Shared::IsData

#errors_excepting, #full_error_messages_excepting, #identical, #is_community?, #is_destroyable?, #is_editable?, #is_in_use?, #is_in_users_projects?, #metamorphosize, #similar

Methods included from Shared::HasRoles

#has_roles?

Methods included from Shared::Documentation

#document_array=, #documented?, #reject_documentation, #reject_documents

Methods included from Shared::Tags

#reject_tags, #tag_with, #tagged?, #tagged_with?

Methods included from Shared::Notes

#concatenated_notes_string, #reject_notes

Methods included from Shared::Identifiers

#dwc_occurrence_id, #identified?, #next_by_identifier, #previous_by_identifier, #reject_identifiers

Methods included from Shared::DataAttributes

#import_attributes, #internal_attributes, #keyword_value_hash, #reject_data_attributes

Methods included from Shared::AlternateValues

#all_values_for, #alternate_valued?

Methods included from Housekeeping::Timestamps

#data_breakdown_for_chartkick_recent

Methods included from Housekeeping::Users

#set_created_by_id, #set_updated_by_id

Methods inherited from ApplicationRecord

transaction_with_retry

Instance Attribute Details

#abstract ⇒ `String`

TODO:

Returns:

(String)

# File 'app/models/source/bibtex.rb', line 302

class Source::Bibtex < Source

  # Type will change
  DEFAULT_CSL_STYLE = 'taxonworks'
  #DEFAULT_CSL_STYLE = 'zootaxa'

  attr_accessor :authors_to_create

  include Shared::OriginRelationship
  include Source::Bibtex::SoftValidationExtensions::Instance
  extend Source::Bibtex::SoftValidationExtensions::Klass

  is_origin_for 'Source::Bibtex', 'Source::Verbatim'
  originates_from 'Source::Bibtex', 'Source::Verbatim'

  GRAPH_ENTRY_POINTS = [:origin_relationships]

  # Used in soft validation
  BIBTEX_REQUIRED_FIELDS = {
    article: [:author, :title, :journal, :year],
    book: [:author, :editor, :title, :publisher, :year],
    booklet: [:title],
    conference: [:author, :title, :booktitle, :year],
    inbook: [:author, :editor, :title, :chapter, :pages, :publisher, :year],
    incollection: [:author, :title, :booktitle, :publisher, :year],
    inproceedings:  [:author, :title, :booktitle, :year],
    manual: [:title],
    mastersthesis: [:author, :title, :school, :year],
    misc: [],
    phdthesis: [:author, :title, :school, :year],
    proceedings: [:title, :year],
    techreport: [:author,:title,:institution, :year],
    unpublished: [:author, :title, :note]
  }

  # TW required fields (must have one of these fields filled in)
  # either year or stated_year is acceptable
  TW_REQUIRED_FIELDS = [:author, :editor, :booktitle, :title, :url, :journal, :year, :stated_year].freeze

  IGNORE_SIMILAR = [:verbatim, :cached, :cached_author_string, :cached_nomenclature_date].freeze
  IGNORE_IDENTICAL = IGNORE_SIMILAR.dup.freeze

  belongs_to :serial, inverse_of: :sources

  # handle conflict with BibTex language field.
  belongs_to :source_language, class_name: 'Language', foreign_key: :language_id, inverse_of: :sources

  has_many :author_roles, -> { order('roles.position ASC') }, class_name: 'SourceAuthor',
    as: :role_object, validate: true

  has_many :authors, -> { order('roles.position ASC') }, through: :author_roles, source: :person, validate: true

  has_many :editor_roles, -> { order('roles.position ASC') }, class_name: 'SourceEditor',
    as: :role_object, validate: true
  has_many :editors, -> { order('roles.position ASC') }, through: :editor_roles, source: :person, validate: true

  accepts_nested_attributes_for :authors, :editors, :author_roles, :editor_roles, allow_destroy: true

  before_validation :create_authors, if: -> { !authors_to_create.nil? }
  before_validation :check_has_field

  validates_inclusion_of :bibtex_type,
    in: ::VALID_BIBTEX_TYPES,
    message: '"%{value}" is not a valid source type'

  validates_presence_of :year,
    if: -> { !month.blank? || !stated_year.blank? },
    message: 'is required when month or stated_year is provided'

  validates :year, date_year: {
    min_year: 1000, max_year: Time.now.year + 2,
    message: 'must be an integer greater than 999 and no more than 2 years in the future'}

  validates_presence_of :month,
    unless: -> { day.blank? },
    message: 'is required when day is provided'

  validates_inclusion_of :month,
    in: ::VALID_BIBTEX_MONTHS,
    allow_blank: true,
    message: ' month'

  validates :day, date_day: {year_sym: :year, month_sym: :month},
            unless: -> { year.blank? || month.blank? }

  validates :url, format: {
    with: URI::regexp(%w(http https ftp)),
    message: '[%{value}] is not a valid URL'}, allow_blank: true

  validate :italics_are_paired, unless: -> { title.blank? }
  validate :validate_year_suffix, unless: -> { self.no_year_suffix_validation || (self.type != 'Source::Bibtex') }

  # includes nil last, exclude it explicitly with another condition if need be
  scope :order_by_nomenclature_date, -> { order(:cached_nomenclature_date) }

  # @param [BibTeX::Name] bibtex_author
  # @return [Person, Boolean] new person, or false
  def self.bibtex_author_to_person(bibtex_author)
    return false if bibtex_author.class != BibTeX::Name
    p = Person.new(
      first_name: bibtex_author.first,
      prefix: bibtex_author.prefix,
      last_name: bibtex_author.last,
      suffix: bibtex_author.suffix)
    p.namecase_names
    p
  end

  # @return [BibTeX::Entry]
  def self.new_from_bibtex_text(text = nil)
    a = BibTeX::Bibliography.parse(text, filter: :latex).first
    new_from_bibtex(a)
  end

  # Instantiates a Source::Bibtex instance from a BibTeX::Entry
  # Note:
  #    * note conversion is handled in note setter.
  #    * identifiers are handled in associated setter.
  #    * !! Unrecognized attributes are added as import attributes.
  #
  # Usage:
  #    a = BibTeX::Entry.new(bibtex_type: 'book', title: 'Foos of Bar America', author: 'Smith, James', year: 1921)
  #    b = Source::Bibtex.new_from_bibtex(a)
  #
  # @param [BibTex::Entry] bibtex_entry the BibTex::Entry to convert
  # @return [Source::BibTex.new] a new instance
  # @todo annote to project specific note?
  # @todo if it finds one & only one match for serial assigns the serial ID, and if not it just store in journal title
  # serial with alternate_value on name .count = 1 assign .first
  # before validate assign serial if matching & not doesn't have a serial currently assigned.
  # @todo if there is an ISSN it should look up to see it the serial already exists.
  def self.new_from_bibtex(bibtex_entry = nil)
    return false if !bibtex_entry.kind_of?(::BibTeX::Entry)

    s = Source::Bibtex.new(bibtex_type: bibtex_entry.type.to_s)

    import_attributes = []

    bibtex_entry.fields.each do |key, value|
      if key == :keywords
        s.verbatim_keywords = value
        next
      end

      v = value.to_s.strip
      if s.respond_to?(key.to_sym) && key != :type
        s.send("#{key}=", v)
      else
        import_attributes.push({import_predicate: key, value: v, type: 'ImportAttribute'})
      end
    end
    s.data_attributes_attributes = import_attributes
    s
  end

  # @return [Array] journal, nil or name
  def journal
    [read_attribute(:journal), (serial.blank? ? nil : serial.name)].compact.first
  end

  # @return [String]
  def verbatim_journal
    read_attribute(:journal)
  end

  # @return [Boolean]
  #   whether the BibTeX::Entry representation of this source is valid
  def valid_bibtex?
    to_bibtex.valid?
  end

  # @return [String] A string that represents the year with suffix as seen in a BibTeX bibliography.
  #   returns "" if neither :year or :year_suffix are set.
  def year_with_suffix
    [year, year_suffix].compact.join
  end

  # @return [String] A string that represents the authors last_names and year (no suffix)
  def author_year
    return 'not yet calculated' if new_record?
    [cached_author_string, year].compact.join(', ')
  end

  # TODO: Not used
  #
  # Modified from build, the issues with polymorphic has_many and build
  # are more than we want to tackle right now.
  #
  # @return [Array, Boolean] of names, or false
  def create_related_people_and_roles
    return false if !self.valid? ||
      self.new_record? ||
      (self.author.blank? && self.editor.blank?) ||
      self.roles.count > 0

    bibtex = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(bibtex)

    begin
      Role.transaction do
        if bibtex.authors
          bibtex.authors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceAuthor.create!(role_object: self, person: p)
          end
        end

        if bibtex.editors
          bibtex.editors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceEditor.create!(role_object: self, person: p)
          end
        end
      end
    rescue ActiveRecord::RecordInvalid
      raise
    end
    true
  end

  #region getters & setters

  # @param [String, Integer] value
  # @return [Integer] value of year
  def year=(value)
    if value.class == String
      value =~ /\A(\d\d\d\d)([a-zA-Z]*)\z/
      write_attribute(:year, $1.to_i) if $1
      write_attribute(:year_suffix, $2) if $2
      write_attribute(:year, value) if self.year.blank?
    else
      write_attribute(:year, value)
    end
  end

  # @param [String] value
  # @return [String]
  def month=(value)
    v = Utilities::Dates::SHORT_MONTH_FILTER[value]
    v = v.to_s if !v.nil?
    write_attribute(:month, v)
  end

  # Used only on import from BibTeX records
  # @param [String] value
  # @return [String]
  def note=(value)
    write_attribute(:note, value)
    if !self.note.blank? && self.new_record?
      if value.include?('||')
        a = value.split(/||/)
        a.each do |n|
          self.notes.build({text: n + ' [Created on import from BibTeX.]'})
        end
      else
        self.notes.build({text: value + ' [Created on import from BibTeX.]'})
      end
    end
  end

  # @param [String] value
  # @return [String]
  def isbn=(value)
    write_attribute(:isbn, value)
    unless value.blank?
      if tw_isbn = self.identifiers.where(type: 'Identifier::Global::Isbn').first
        if tw_isbn.identifier != value
          tw_isbn.destroy!
          self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
      end
    end
  end

  # @return [String]
  def isbn
    identifier_string_of_type('Identifier::Global::Isbn')
  end

  # @param [String] value
  # @return [String]
  def doi=(value)
    write_attribute(:doi, value)
    unless value.blank?
      if tw_doi = self.identifiers.where(type: 'Identifier::Global::Doi').first
        if tw_doi.identifier != value
          tw_doi.destroy!
          self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
      end
    end
  end

  # @return [String]
  def doi
    identifier_string_of_type('Identifier::Global::Doi')
  end

  # @todo Are ISSN only Serials now? Maybe - the raw bibtex source may come in with an ISSN in which case
  # we need to set the serial based on ISSN.
  # @param [String] value
  # @return [String]
  def issn=(value)
    write_attribute(:issn, value)
    unless value.blank?
      tw_issn = self.identifiers.where(type: 'Identifier::Global::Issn').first
      unless tw_issn.nil? || tw_issn.identifier != value
        tw_issn.destroy
      end
      self.identifiers.build(type: 'Identifier::Global::Issn', identifier: value)
    end
  end

  # @return [String]
  def issn
    identifier_string_of_type('Identifier::Global::Issn')
  end

  # turn bibtex URL field into a Ruby URI object
  # @return [URI]
  def url_as_uri
    URI(self.url) unless self.url.blank?
  end

  # @param [String] type_value
  # @return [Identifier]
  #   the identifier of this type, relies on Identifier to enforce has_one for Global identifiers
  #   !! behaviour for Identifier::Local types may be unexpected
  def identifier_string_of_type(type_value)
    # Also handle in memory
    identifiers.each do |i|
      return i.identifier if i.type == type_value
    end
    nil
    # identifiers.where(type: type_value).first&.identifier
  end

 #endregion getters & setters

  # @return [Boolean]
  # is there a bibtex author or author roles?
  def has_authors?
    return true if !author.blank?
    return false if new_record?
    # self exists in the db
    authors.count > 0 ? true : false
  end

  # @return [Boolean]
  def has_editors?
    return true if editor
    # editor attribute is empty
    return false if new_record? # WHY!?
    # self exists in the db
    editors.count > 0 ? true : false
  end

  # @return [Boolean]
  #  true contains either an author or editor
  def has_writer?
    (has_authors? || has_editors?) ? true : false
  end

  # @return [Boolean]
  def has_some_year? # is there a year or stated year?
    return false if year.blank? && stated_year.blank?
    true
  end

  # @return [Integer]
  #  The effective year of publication as per nomenclatural rules
  def nomenclature_year
    cached_nomenclature_date.year
  end

  # @return [Date || Time] <sigh>
  #  An memoizer, getter for cached_nomenclature_date, computes if not .persisted?
  def cached_nomenclature_date
    if !persisted?
      nomenclature_date
    else
      read_attribute(:cached_nomenclature_date)
    end
  end

  # rubocop:disable Metrics/MethodLength
  # @return [BibTeX::Entry, false]
  #   !! Entry equivalent to self, this should round-trip with no changes.
  def to_bibtex
    return false if bibtex_type.nil?
    b = BibTeX::Entry.new(bibtex_type: bibtex_type)

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank?
        b[f] = v
      end
    end

    b[:keywords] = verbatim_keywords unless verbatim_keywords.blank?
    b[:note] = concatenated_notes_string unless concatenated_notes_string.blank?

    unless serial.nil?
      b[:journal] = serial.name
      issns  = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    unless serial.nil?
      b[:journal] = serial.name
      issns = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    uris = identifiers.where(type: 'Identifier::Global::Uri')
    unless uris.empty?
      b[:url] = uris.first.identifier # TW only allows one URI per object
    end

    isbns = identifiers.where(type: 'Identifier::Global::Isbn')
    unless isbns.empty?
      b[:isbn] = isbns.first.identifier # TW only allows one ISBN per object
    end

    dois = identifiers.where(type: 'Identifier::Global::Doi') #.of_type(:isbn)
    unless dois.empty?
      b[:doi] = dois.first.identifier # TW only allows one DOI per object
    end

    # Overiden by `author` and `editor` if present
    b.author = get_bibtex_names('author') if author_roles.load.any? # unless (!authors.load.any? && author.blank?)
    b.editor = get_bibtex_names('editor') if editor_roles.load.any? # unless (!editors.load.any? && editor.blank?)

    # TODO: use global_id or replace with UUID or DOI if available
    b.key = id unless new_record?
    b
  end

  # @return Hash
  #   a to_citeproc with values updated for literal
  #   handling via `{}` in TaxonWorks
  def to_citeproc(normalize_names = true)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names

    a = b.to_citeproc

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank? && (v =~ /\A{(.*)}\z/)
        a[f.to_s] = {literal: $1}
      end
    end

    a['year-suffix'] = year_suffix unless year_suffix.blank?
    a['original-date'] = {"date-parts" => [[ stated_year ]]} unless stated_year.blank?
    a['language'] = Language.find(language_id).english_name.to_s unless language_id.nil?
    a['translated-title'] = alternate_values.where(type: "AlternateValue::Translation", alternate_value_object_attribute: 'title').pluck(:value).first
    a['note'] = note unless note.blank?
    a
  end

  # @return [String, nil]
  #  priority is Person, string
  #  !! Not the cached value !!
  def get_author
    a = authors.load
    if a.any?
      get_bibtex_names('author')
    else
      author.blank? ? nil : author
    end
  end

  # @return [BibTex::Bibliography]
  #   initialized with this Source as an entry
  def bibtex_bibliography
    TaxonWorks::Vendor::BibtexRuby.bibliography([self])
 end

  # @param [String] style
  # @param [String] format
  # @return [String]
  #   this source, rendered in the provided CSL style, as text
  def render_with_style(style = 'vancouver', format = 'text', normalize_names = true)
    s = ::TaxonWorks::Vendor::BibtexRuby.get_style(style)
    cp = CiteProc::Processor.new(style: s, format: format)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names
    cp.import( [to_citeproc(normalize_names)] )
    cp.render(:bibliography, id: cp.items.keys.first).first.strip
  end

  # @param [String] format
  # @return [String]
  #   a full representation, using bibtex
  # String must be length > 0
  def cached_string(format = 'text')
    return nil unless (format == 'text') || (format == 'html')
    str = render_with_style(DEFAULT_CSL_STYLE, format)
    str.sub('(0ADAD)', '') # citeproc renders year 0000 as (0ADAD)
  end

  # @return [String, nil]
  #   last names formatted as displayed in nomenclatural authority (iczn), prioritizes
  #   normalized People before BibTeX `author`
  #   !! This is NOT a legal BibTeX format  !!
  def authority_name(reload = true)
    reload ? authors.reload : authors.load
    if !authors.any? # no normalized people, use string, !! not .any? because of in-memory setting?!
      if author.blank?
        return nil
      else
        b = to_bibtex
        ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b)
        return Utilities::Strings.authorship_sentence(b.author.tokens.collect{ |t| t.last })
      end
    else # use normalized records
      return Utilities::Strings.authorship_sentence(authors.collect{ |a| a.full_last_name })
    end
  end

  protected

  def validate_year_suffix
    a = get_author
    unless year_suffix.blank? || year.blank? || a.blank?
      if new_record?
        s = Source.where(author: a, year: year, year_suffix: year_suffix).first
      else
        s = Source.where(author: a, year: year, year_suffix: year_suffix).not_self(self).first
      end
      errors.add(:year_suffix, " '#{year_suffix}' is already used for #{a} #{year}") unless s.nil?
    end
  end

  def italics_are_paired
    l = title.scan('<i>')&.count
    r = title.scan('</i>')&.count
    errors.add(:title, 'italic markup is not paired') unless l == r
  end

  # @param [String] type either `author` or `editor`
  # @return [String]
  #   The BibTeX version of the name strings created from People
  #   BibTeX format is 'lastname, firstname and lastname, firstname and lastname, firstname'
  #   This only references People, i.e. `authors` and `editors`.
  #   !! Do not adapt to reference the BibTeX attributes `author` or `editor`
  def get_bibtex_names(role_type)
    # so, we can not reload here
    send("#{role_type}s").collect{ |a| a.bibtex_name}.join(' and ')
  end

  # @return [Ignored]
  def create_authors
    begin
      Person.transaction do
        authors_to_create.each do |shs|
          p = Person.create!(shs)
          author_roles.build(person: p)
        end
      end
    rescue
      errors.add(:base, 'invalid author parameters')
    end
  end

  # TODO: Replace with taxonworks.csl.  Move unsupported fields to
  # wrappers in vue rendering.
  # set cached values and copies active record relations into bibtex values
  # @return [Ignored]
  def set_cached
    if errors.empty?
      attributes_to_update = {}
      attributes_to_update[:author] = get_bibtex_names('author') if authors.reload.size > 0
      attributes_to_update[:editor] = get_bibtex_names('editor') if editors.reload.size > 0
      attributes_to_update.merge!(
        cached: get_cached,
        cached_nomenclature_date: nomenclature_date,
        cached_author_string: authority_name(false)
      )
      update_columns(attributes_to_update)
    end
  end

  def get_cached
    if errors.empty?
      c = cached_string('html') # preserves our convention of <i>
      return c
    end
    nil
  end

  #region hard validations

  # must have at least one of the required fields (TW_REQUIRED_FIELDS)
  # @return [Ignored]
  def check_has_field
    valid = false
    TW_REQUIRED_FIELDS.each do |i|
      if !self[i].blank?
        valid = true
        break
      end
    end
    #TODO This test for auth doesn't work with a new record.
    if (self.authors.count > 0 || self.editors.count > 0 || !self.serial.nil?)
      valid = true
    end
    if !valid
      errors.add(
        :base,
        'Missing core data. A TaxonWorks source must have one of the following: author, editor, booktitle, title, url, journal, year, or stated year'
      )
    end
  end

  def sv_cached_names # this cannot be moved to soft_validation_extensions
    is_cached = true

    if author.to_s != get_bibtex_names('author') ||
        editor.to_s != get_bibtex_names('editor') ||
        cached != get_cached ||
        cached_nomenclature_date != nomenclature_date ||
        cached_author_string.to_s != authority_name(false)
      is_cached = false
    end

    soft_validations.add(
      :base, 'Cached values should be updated',
      success_message: 'Cached values were updated',
      failure_message:  'Failed to update cached values') if !is_cached
  end
end

#address ⇒ `#String`^?

BibTeX standard field (optional for types: book, inbook, incollection, inproceedings, manual, mastersthesis, phdthesis, proceedings, techreport) Usually the address of the publisher or other type of institution. For major publishing houses, van Leunen recommends omitting the information entirely. For small publishers, on the other hand, you can help the reader by giving the complete address.

Returns:

(#String) —

the address
(nil) —

means the attribute is not stored in the database.

# File 'app/models/source/bibtex.rb', line 302

class Source::Bibtex < Source

  # Type will change
  DEFAULT_CSL_STYLE = 'taxonworks'
  #DEFAULT_CSL_STYLE = 'zootaxa'

  attr_accessor :authors_to_create

  include Shared::OriginRelationship
  include Source::Bibtex::SoftValidationExtensions::Instance
  extend Source::Bibtex::SoftValidationExtensions::Klass

  is_origin_for 'Source::Bibtex', 'Source::Verbatim'
  originates_from 'Source::Bibtex', 'Source::Verbatim'

  GRAPH_ENTRY_POINTS = [:origin_relationships]

  # Used in soft validation
  BIBTEX_REQUIRED_FIELDS = {
    article: [:author, :title, :journal, :year],
    book: [:author, :editor, :title, :publisher, :year],
    booklet: [:title],
    conference: [:author, :title, :booktitle, :year],
    inbook: [:author, :editor, :title, :chapter, :pages, :publisher, :year],
    incollection: [:author, :title, :booktitle, :publisher, :year],
    inproceedings:  [:author, :title, :booktitle, :year],
    manual: [:title],
    mastersthesis: [:author, :title, :school, :year],
    misc: [],
    phdthesis: [:author, :title, :school, :year],
    proceedings: [:title, :year],
    techreport: [:author,:title,:institution, :year],
    unpublished: [:author, :title, :note]
  }

  # TW required fields (must have one of these fields filled in)
  # either year or stated_year is acceptable
  TW_REQUIRED_FIELDS = [:author, :editor, :booktitle, :title, :url, :journal, :year, :stated_year].freeze

  IGNORE_SIMILAR = [:verbatim, :cached, :cached_author_string, :cached_nomenclature_date].freeze
  IGNORE_IDENTICAL = IGNORE_SIMILAR.dup.freeze

  belongs_to :serial, inverse_of: :sources

  # handle conflict with BibTex language field.
  belongs_to :source_language, class_name: 'Language', foreign_key: :language_id, inverse_of: :sources

  has_many :author_roles, -> { order('roles.position ASC') }, class_name: 'SourceAuthor',
    as: :role_object, validate: true

  has_many :authors, -> { order('roles.position ASC') }, through: :author_roles, source: :person, validate: true

  has_many :editor_roles, -> { order('roles.position ASC') }, class_name: 'SourceEditor',
    as: :role_object, validate: true
  has_many :editors, -> { order('roles.position ASC') }, through: :editor_roles, source: :person, validate: true

  accepts_nested_attributes_for :authors, :editors, :author_roles, :editor_roles, allow_destroy: true

  before_validation :create_authors, if: -> { !authors_to_create.nil? }
  before_validation :check_has_field

  validates_inclusion_of :bibtex_type,
    in: ::VALID_BIBTEX_TYPES,
    message: '"%{value}" is not a valid source type'

  validates_presence_of :year,
    if: -> { !month.blank? || !stated_year.blank? },
    message: 'is required when month or stated_year is provided'

  validates :year, date_year: {
    min_year: 1000, max_year: Time.now.year + 2,
    message: 'must be an integer greater than 999 and no more than 2 years in the future'}

  validates_presence_of :month,
    unless: -> { day.blank? },
    message: 'is required when day is provided'

  validates_inclusion_of :month,
    in: ::VALID_BIBTEX_MONTHS,
    allow_blank: true,
    message: ' month'

  validates :day, date_day: {year_sym: :year, month_sym: :month},
            unless: -> { year.blank? || month.blank? }

  validates :url, format: {
    with: URI::regexp(%w(http https ftp)),
    message: '[%{value}] is not a valid URL'}, allow_blank: true

  validate :italics_are_paired, unless: -> { title.blank? }
  validate :validate_year_suffix, unless: -> { self.no_year_suffix_validation || (self.type != 'Source::Bibtex') }

  # includes nil last, exclude it explicitly with another condition if need be
  scope :order_by_nomenclature_date, -> { order(:cached_nomenclature_date) }

  # @param [BibTeX::Name] bibtex_author
  # @return [Person, Boolean] new person, or false
  def self.bibtex_author_to_person(bibtex_author)
    return false if bibtex_author.class != BibTeX::Name
    p = Person.new(
      first_name: bibtex_author.first,
      prefix: bibtex_author.prefix,
      last_name: bibtex_author.last,
      suffix: bibtex_author.suffix)
    p.namecase_names
    p
  end

  # @return [BibTeX::Entry]
  def self.new_from_bibtex_text(text = nil)
    a = BibTeX::Bibliography.parse(text, filter: :latex).first
    new_from_bibtex(a)
  end

  # Instantiates a Source::Bibtex instance from a BibTeX::Entry
  # Note:
  #    * note conversion is handled in note setter.
  #    * identifiers are handled in associated setter.
  #    * !! Unrecognized attributes are added as import attributes.
  #
  # Usage:
  #    a = BibTeX::Entry.new(bibtex_type: 'book', title: 'Foos of Bar America', author: 'Smith, James', year: 1921)
  #    b = Source::Bibtex.new_from_bibtex(a)
  #
  # @param [BibTex::Entry] bibtex_entry the BibTex::Entry to convert
  # @return [Source::BibTex.new] a new instance
  # @todo annote to project specific note?
  # @todo if it finds one & only one match for serial assigns the serial ID, and if not it just store in journal title
  # serial with alternate_value on name .count = 1 assign .first
  # before validate assign serial if matching & not doesn't have a serial currently assigned.
  # @todo if there is an ISSN it should look up to see it the serial already exists.
  def self.new_from_bibtex(bibtex_entry = nil)
    return false if !bibtex_entry.kind_of?(::BibTeX::Entry)

    s = Source::Bibtex.new(bibtex_type: bibtex_entry.type.to_s)

    import_attributes = []

    bibtex_entry.fields.each do |key, value|
      if key == :keywords
        s.verbatim_keywords = value
        next
      end

      v = value.to_s.strip
      if s.respond_to?(key.to_sym) && key != :type
        s.send("#{key}=", v)
      else
        import_attributes.push({import_predicate: key, value: v, type: 'ImportAttribute'})
      end
    end
    s.data_attributes_attributes = import_attributes
    s
  end

  # @return [Array] journal, nil or name
  def journal
    [read_attribute(:journal), (serial.blank? ? nil : serial.name)].compact.first
  end

  # @return [String]
  def verbatim_journal
    read_attribute(:journal)
  end

  # @return [Boolean]
  #   whether the BibTeX::Entry representation of this source is valid
  def valid_bibtex?
    to_bibtex.valid?
  end

  # @return [String] A string that represents the year with suffix as seen in a BibTeX bibliography.
  #   returns "" if neither :year or :year_suffix are set.
  def year_with_suffix
    [year, year_suffix].compact.join
  end

  # @return [String] A string that represents the authors last_names and year (no suffix)
  def author_year
    return 'not yet calculated' if new_record?
    [cached_author_string, year].compact.join(', ')
  end

  # TODO: Not used
  #
  # Modified from build, the issues with polymorphic has_many and build
  # are more than we want to tackle right now.
  #
  # @return [Array, Boolean] of names, or false
  def create_related_people_and_roles
    return false if !self.valid? ||
      self.new_record? ||
      (self.author.blank? && self.editor.blank?) ||
      self.roles.count > 0

    bibtex = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(bibtex)

    begin
      Role.transaction do
        if bibtex.authors
          bibtex.authors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceAuthor.create!(role_object: self, person: p)
          end
        end

        if bibtex.editors
          bibtex.editors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceEditor.create!(role_object: self, person: p)
          end
        end
      end
    rescue ActiveRecord::RecordInvalid
      raise
    end
    true
  end

  #region getters & setters

  # @param [String, Integer] value
  # @return [Integer] value of year
  def year=(value)
    if value.class == String
      value =~ /\A(\d\d\d\d)([a-zA-Z]*)\z/
      write_attribute(:year, $1.to_i) if $1
      write_attribute(:year_suffix, $2) if $2
      write_attribute(:year, value) if self.year.blank?
    else
      write_attribute(:year, value)
    end
  end

  # @param [String] value
  # @return [String]
  def month=(value)
    v = Utilities::Dates::SHORT_MONTH_FILTER[value]
    v = v.to_s if !v.nil?
    write_attribute(:month, v)
  end

  # Used only on import from BibTeX records
  # @param [String] value
  # @return [String]
  def note=(value)
    write_attribute(:note, value)
    if !self.note.blank? && self.new_record?
      if value.include?('||')
        a = value.split(/||/)
        a.each do |n|
          self.notes.build({text: n + ' [Created on import from BibTeX.]'})
        end
      else
        self.notes.build({text: value + ' [Created on import from BibTeX.]'})
      end
    end
  end

  # @param [String] value
  # @return [String]
  def isbn=(value)
    write_attribute(:isbn, value)
    unless value.blank?
      if tw_isbn = self.identifiers.where(type: 'Identifier::Global::Isbn').first
        if tw_isbn.identifier != value
          tw_isbn.destroy!
          self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
      end
    end
  end

  # @return [String]
  def isbn
    identifier_string_of_type('Identifier::Global::Isbn')
  end

  # @param [String] value
  # @return [String]
  def doi=(value)
    write_attribute(:doi, value)
    unless value.blank?
      if tw_doi = self.identifiers.where(type: 'Identifier::Global::Doi').first
        if tw_doi.identifier != value
          tw_doi.destroy!
          self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
      end
    end
  end

  # @return [String]
  def doi
    identifier_string_of_type('Identifier::Global::Doi')
  end

  # @todo Are ISSN only Serials now? Maybe - the raw bibtex source may come in with an ISSN in which case
  # we need to set the serial based on ISSN.
  # @param [String] value
  # @return [String]
  def issn=(value)
    write_attribute(:issn, value)
    unless value.blank?
      tw_issn = self.identifiers.where(type: 'Identifier::Global::Issn').first
      unless tw_issn.nil? || tw_issn.identifier != value
        tw_issn.destroy
      end
      self.identifiers.build(type: 'Identifier::Global::Issn', identifier: value)
    end
  end

  # @return [String]
  def issn
    identifier_string_of_type('Identifier::Global::Issn')
  end

  # turn bibtex URL field into a Ruby URI object
  # @return [URI]
  def url_as_uri
    URI(self.url) unless self.url.blank?
  end

  # @param [String] type_value
  # @return [Identifier]
  #   the identifier of this type, relies on Identifier to enforce has_one for Global identifiers
  #   !! behaviour for Identifier::Local types may be unexpected
  def identifier_string_of_type(type_value)
    # Also handle in memory
    identifiers.each do |i|
      return i.identifier if i.type == type_value
    end
    nil
    # identifiers.where(type: type_value).first&.identifier
  end

 #endregion getters & setters

  # @return [Boolean]
  # is there a bibtex author or author roles?
  def has_authors?
    return true if !author.blank?
    return false if new_record?
    # self exists in the db
    authors.count > 0 ? true : false
  end

  # @return [Boolean]
  def has_editors?
    return true if editor
    # editor attribute is empty
    return false if new_record? # WHY!?
    # self exists in the db
    editors.count > 0 ? true : false
  end

  # @return [Boolean]
  #  true contains either an author or editor
  def has_writer?
    (has_authors? || has_editors?) ? true : false
  end

  # @return [Boolean]
  def has_some_year? # is there a year or stated year?
    return false if year.blank? && stated_year.blank?
    true
  end

  # @return [Integer]
  #  The effective year of publication as per nomenclatural rules
  def nomenclature_year
    cached_nomenclature_date.year
  end

  # @return [Date || Time] <sigh>
  #  An memoizer, getter for cached_nomenclature_date, computes if not .persisted?
  def cached_nomenclature_date
    if !persisted?
      nomenclature_date
    else
      read_attribute(:cached_nomenclature_date)
    end
  end

  # rubocop:disable Metrics/MethodLength
  # @return [BibTeX::Entry, false]
  #   !! Entry equivalent to self, this should round-trip with no changes.
  def to_bibtex
    return false if bibtex_type.nil?
    b = BibTeX::Entry.new(bibtex_type: bibtex_type)

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank?
        b[f] = v
      end
    end

    b[:keywords] = verbatim_keywords unless verbatim_keywords.blank?
    b[:note] = concatenated_notes_string unless concatenated_notes_string.blank?

    unless serial.nil?
      b[:journal] = serial.name
      issns  = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    unless serial.nil?
      b[:journal] = serial.name
      issns = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    uris = identifiers.where(type: 'Identifier::Global::Uri')
    unless uris.empty?
      b[:url] = uris.first.identifier # TW only allows one URI per object
    end

    isbns = identifiers.where(type: 'Identifier::Global::Isbn')
    unless isbns.empty?
      b[:isbn] = isbns.first.identifier # TW only allows one ISBN per object
    end

    dois = identifiers.where(type: 'Identifier::Global::Doi') #.of_type(:isbn)
    unless dois.empty?
      b[:doi] = dois.first.identifier # TW only allows one DOI per object
    end

    # Overiden by `author` and `editor` if present
    b.author = get_bibtex_names('author') if author_roles.load.any? # unless (!authors.load.any? && author.blank?)
    b.editor = get_bibtex_names('editor') if editor_roles.load.any? # unless (!editors.load.any? && editor.blank?)

    # TODO: use global_id or replace with UUID or DOI if available
    b.key = id unless new_record?
    b
  end

  # @return Hash
  #   a to_citeproc with values updated for literal
  #   handling via `{}` in TaxonWorks
  def to_citeproc(normalize_names = true)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names

    a = b.to_citeproc

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank? && (v =~ /\A{(.*)}\z/)
        a[f.to_s] = {literal: $1}
      end
    end

    a['year-suffix'] = year_suffix unless year_suffix.blank?
    a['original-date'] = {"date-parts" => [[ stated_year ]]} unless stated_year.blank?
    a['language'] = Language.find(language_id).english_name.to_s unless language_id.nil?
    a['translated-title'] = alternate_values.where(type: "AlternateValue::Translation", alternate_value_object_attribute: 'title').pluck(:value).first
    a['note'] = note unless note.blank?
    a
  end

  # @return [String, nil]
  #  priority is Person, string
  #  !! Not the cached value !!
  def get_author
    a = authors.load
    if a.any?
      get_bibtex_names('author')
    else
      author.blank? ? nil : author
    end
  end

  # @return [BibTex::Bibliography]
  #   initialized with this Source as an entry
  def bibtex_bibliography
    TaxonWorks::Vendor::BibtexRuby.bibliography([self])
 end

  # @param [String] style
  # @param [String] format
  # @return [String]
  #   this source, rendered in the provided CSL style, as text
  def render_with_style(style = 'vancouver', format = 'text', normalize_names = true)
    s = ::TaxonWorks::Vendor::BibtexRuby.get_style(style)
    cp = CiteProc::Processor.new(style: s, format: format)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names
    cp.import( [to_citeproc(normalize_names)] )
    cp.render(:bibliography, id: cp.items.keys.first).first.strip
  end

  # @param [String] format
  # @return [String]
  #   a full representation, using bibtex
  # String must be length > 0
  def cached_string(format = 'text')
    return nil unless (format == 'text') || (format == 'html')
    str = render_with_style(DEFAULT_CSL_STYLE, format)
    str.sub('(0ADAD)', '') # citeproc renders year 0000 as (0ADAD)
  end

  # @return [String, nil]
  #   last names formatted as displayed in nomenclatural authority (iczn), prioritizes
  #   normalized People before BibTeX `author`
  #   !! This is NOT a legal BibTeX format  !!
  def authority_name(reload = true)
    reload ? authors.reload : authors.load
    if !authors.any? # no normalized people, use string, !! not .any? because of in-memory setting?!
      if author.blank?
        return nil
      else
        b = to_bibtex
        ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b)
        return Utilities::Strings.authorship_sentence(b.author.tokens.collect{ |t| t.last })
      end
    else # use normalized records
      return Utilities::Strings.authorship_sentence(authors.collect{ |a| a.full_last_name })
    end
  end

  protected

  def validate_year_suffix
    a = get_author
    unless year_suffix.blank? || year.blank? || a.blank?
      if new_record?
        s = Source.where(author: a, year: year, year_suffix: year_suffix).first
      else
        s = Source.where(author: a, year: year, year_suffix: year_suffix).not_self(self).first
      end
      errors.add(:year_suffix, " '#{year_suffix}' is already used for #{a} #{year}") unless s.nil?
    end
  end

  def italics_are_paired
    l = title.scan('<i>')&.count
    r = title.scan('</i>')&.count
    errors.add(:title, 'italic markup is not paired') unless l == r
  end

  # @param [String] type either `author` or `editor`
  # @return [String]
  #   The BibTeX version of the name strings created from People
  #   BibTeX format is 'lastname, firstname and lastname, firstname and lastname, firstname'
  #   This only references People, i.e. `authors` and `editors`.
  #   !! Do not adapt to reference the BibTeX attributes `author` or `editor`
  def get_bibtex_names(role_type)
    # so, we can not reload here
    send("#{role_type}s").collect{ |a| a.bibtex_name}.join(' and ')
  end

  # @return [Ignored]
  def create_authors
    begin
      Person.transaction do
        authors_to_create.each do |shs|
          p = Person.create!(shs)
          author_roles.build(person: p)
        end
      end
    rescue
      errors.add(:base, 'invalid author parameters')
    end
  end

  # TODO: Replace with taxonworks.csl.  Move unsupported fields to
  # wrappers in vue rendering.
  # set cached values and copies active record relations into bibtex values
  # @return [Ignored]
  def set_cached
    if errors.empty?
      attributes_to_update = {}
      attributes_to_update[:author] = get_bibtex_names('author') if authors.reload.size > 0
      attributes_to_update[:editor] = get_bibtex_names('editor') if editors.reload.size > 0
      attributes_to_update.merge!(
        cached: get_cached,
        cached_nomenclature_date: nomenclature_date,
        cached_author_string: authority_name(false)
      )
      update_columns(attributes_to_update)
    end
  end

  def get_cached
    if errors.empty?
      c = cached_string('html') # preserves our convention of <i>
      return c
    end
    nil
  end

  #region hard validations

  # must have at least one of the required fields (TW_REQUIRED_FIELDS)
  # @return [Ignored]
  def check_has_field
    valid = false
    TW_REQUIRED_FIELDS.each do |i|
      if !self[i].blank?
        valid = true
        break
      end
    end
    #TODO This test for auth doesn't work with a new record.
    if (self.authors.count > 0 || self.editors.count > 0 || !self.serial.nil?)
      valid = true
    end
    if !valid
      errors.add(
        :base,
        'Missing core data. A TaxonWorks source must have one of the following: author, editor, booktitle, title, url, journal, year, or stated year'
      )
    end
  end

  def sv_cached_names # this cannot be moved to soft_validation_extensions
    is_cached = true

    if author.to_s != get_bibtex_names('author') ||
        editor.to_s != get_bibtex_names('editor') ||
        cached != get_cached ||
        cached_nomenclature_date != nomenclature_date ||
        cached_author_string.to_s != authority_name(false)
      is_cached = false
    end

    soft_validations.add(
      :base, 'Cached values should be updated',
      success_message: 'Cached values were updated',
      failure_message:  'Failed to update cached values') if !is_cached
  end
end

#annote ⇒ `String`^?

BibTeX standard field (ignored by standard processors) An annotation. It is not used by the standard bibliography styles, but may be used by others that produce an annotated bibliography. (compare to a note which is any additional information which may be useful to the reader) In most cases these are personal annotations; TW will translate these into notes with a specified project so they will only be visible within the project where the note was made. <== Under debate with Matt.

Returns:

(String) —

the annotation
(nil) —

means the attribute is not stored in the database.

# File 'app/models/source/bibtex.rb', line 302

class Source::Bibtex < Source

  # Type will change
  DEFAULT_CSL_STYLE = 'taxonworks'
  #DEFAULT_CSL_STYLE = 'zootaxa'

  attr_accessor :authors_to_create

  include Shared::OriginRelationship
  include Source::Bibtex::SoftValidationExtensions::Instance
  extend Source::Bibtex::SoftValidationExtensions::Klass

  is_origin_for 'Source::Bibtex', 'Source::Verbatim'
  originates_from 'Source::Bibtex', 'Source::Verbatim'

  GRAPH_ENTRY_POINTS = [:origin_relationships]

  # Used in soft validation
  BIBTEX_REQUIRED_FIELDS = {
    article: [:author, :title, :journal, :year],
    book: [:author, :editor, :title, :publisher, :year],
    booklet: [:title],
    conference: [:author, :title, :booktitle, :year],
    inbook: [:author, :editor, :title, :chapter, :pages, :publisher, :year],
    incollection: [:author, :title, :booktitle, :publisher, :year],
    inproceedings:  [:author, :title, :booktitle, :year],
    manual: [:title],
    mastersthesis: [:author, :title, :school, :year],
    misc: [],
    phdthesis: [:author, :title, :school, :year],
    proceedings: [:title, :year],
    techreport: [:author,:title,:institution, :year],
    unpublished: [:author, :title, :note]
  }

  # TW required fields (must have one of these fields filled in)
  # either year or stated_year is acceptable
  TW_REQUIRED_FIELDS = [:author, :editor, :booktitle, :title, :url, :journal, :year, :stated_year].freeze

  IGNORE_SIMILAR = [:verbatim, :cached, :cached_author_string, :cached_nomenclature_date].freeze
  IGNORE_IDENTICAL = IGNORE_SIMILAR.dup.freeze

  belongs_to :serial, inverse_of: :sources

  # handle conflict with BibTex language field.
  belongs_to :source_language, class_name: 'Language', foreign_key: :language_id, inverse_of: :sources

  has_many :author_roles, -> { order('roles.position ASC') }, class_name: 'SourceAuthor',
    as: :role_object, validate: true

  has_many :authors, -> { order('roles.position ASC') }, through: :author_roles, source: :person, validate: true

  has_many :editor_roles, -> { order('roles.position ASC') }, class_name: 'SourceEditor',
    as: :role_object, validate: true
  has_many :editors, -> { order('roles.position ASC') }, through: :editor_roles, source: :person, validate: true

  accepts_nested_attributes_for :authors, :editors, :author_roles, :editor_roles, allow_destroy: true

  before_validation :create_authors, if: -> { !authors_to_create.nil? }
  before_validation :check_has_field

  validates_inclusion_of :bibtex_type,
    in: ::VALID_BIBTEX_TYPES,
    message: '"%{value}" is not a valid source type'

  validates_presence_of :year,
    if: -> { !month.blank? || !stated_year.blank? },
    message: 'is required when month or stated_year is provided'

  validates :year, date_year: {
    min_year: 1000, max_year: Time.now.year + 2,
    message: 'must be an integer greater than 999 and no more than 2 years in the future'}

  validates_presence_of :month,
    unless: -> { day.blank? },
    message: 'is required when day is provided'

  validates_inclusion_of :month,
    in: ::VALID_BIBTEX_MONTHS,
    allow_blank: true,
    message: ' month'

  validates :day, date_day: {year_sym: :year, month_sym: :month},
            unless: -> { year.blank? || month.blank? }

  validates :url, format: {
    with: URI::regexp(%w(http https ftp)),
    message: '[%{value}] is not a valid URL'}, allow_blank: true

  validate :italics_are_paired, unless: -> { title.blank? }
  validate :validate_year_suffix, unless: -> { self.no_year_suffix_validation || (self.type != 'Source::Bibtex') }

  # includes nil last, exclude it explicitly with another condition if need be
  scope :order_by_nomenclature_date, -> { order(:cached_nomenclature_date) }

  # @param [BibTeX::Name] bibtex_author
  # @return [Person, Boolean] new person, or false
  def self.bibtex_author_to_person(bibtex_author)
    return false if bibtex_author.class != BibTeX::Name
    p = Person.new(
      first_name: bibtex_author.first,
      prefix: bibtex_author.prefix,
      last_name: bibtex_author.last,
      suffix: bibtex_author.suffix)
    p.namecase_names
    p
  end

  # @return [BibTeX::Entry]
  def self.new_from_bibtex_text(text = nil)
    a = BibTeX::Bibliography.parse(text, filter: :latex).first
    new_from_bibtex(a)
  end

  # Instantiates a Source::Bibtex instance from a BibTeX::Entry
  # Note:
  #    * note conversion is handled in note setter.
  #    * identifiers are handled in associated setter.
  #    * !! Unrecognized attributes are added as import attributes.
  #
  # Usage:
  #    a = BibTeX::Entry.new(bibtex_type: 'book', title: 'Foos of Bar America', author: 'Smith, James', year: 1921)
  #    b = Source::Bibtex.new_from_bibtex(a)
  #
  # @param [BibTex::Entry] bibtex_entry the BibTex::Entry to convert
  # @return [Source::BibTex.new] a new instance
  # @todo annote to project specific note?
  # @todo if it finds one & only one match for serial assigns the serial ID, and if not it just store in journal title
  # serial with alternate_value on name .count = 1 assign .first
  # before validate assign serial if matching & not doesn't have a serial currently assigned.
  # @todo if there is an ISSN it should look up to see it the serial already exists.
  def self.new_from_bibtex(bibtex_entry = nil)
    return false if !bibtex_entry.kind_of?(::BibTeX::Entry)

    s = Source::Bibtex.new(bibtex_type: bibtex_entry.type.to_s)

    import_attributes = []

    bibtex_entry.fields.each do |key, value|
      if key == :keywords
        s.verbatim_keywords = value
        next
      end

      v = value.to_s.strip
      if s.respond_to?(key.to_sym) && key != :type
        s.send("#{key}=", v)
      else
        import_attributes.push({import_predicate: key, value: v, type: 'ImportAttribute'})
      end
    end
    s.data_attributes_attributes = import_attributes
    s
  end

  # @return [Array] journal, nil or name
  def journal
    [read_attribute(:journal), (serial.blank? ? nil : serial.name)].compact.first
  end

  # @return [String]
  def verbatim_journal
    read_attribute(:journal)
  end

  # @return [Boolean]
  #   whether the BibTeX::Entry representation of this source is valid
  def valid_bibtex?
    to_bibtex.valid?
  end

  # @return [String] A string that represents the year with suffix as seen in a BibTeX bibliography.
  #   returns "" if neither :year or :year_suffix are set.
  def year_with_suffix
    [year, year_suffix].compact.join
  end

  # @return [String] A string that represents the authors last_names and year (no suffix)
  def author_year
    return 'not yet calculated' if new_record?
    [cached_author_string, year].compact.join(', ')
  end

  # TODO: Not used
  #
  # Modified from build, the issues with polymorphic has_many and build
  # are more than we want to tackle right now.
  #
  # @return [Array, Boolean] of names, or false
  def create_related_people_and_roles
    return false if !self.valid? ||
      self.new_record? ||
      (self.author.blank? && self.editor.blank?) ||
      self.roles.count > 0

    bibtex = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(bibtex)

    begin
      Role.transaction do
        if bibtex.authors
          bibtex.authors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceAuthor.create!(role_object: self, person: p)
          end
        end

        if bibtex.editors
          bibtex.editors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceEditor.create!(role_object: self, person: p)
          end
        end
      end
    rescue ActiveRecord::RecordInvalid
      raise
    end
    true
  end

  #region getters & setters

  # @param [String, Integer] value
  # @return [Integer] value of year
  def year=(value)
    if value.class == String
      value =~ /\A(\d\d\d\d)([a-zA-Z]*)\z/
      write_attribute(:year, $1.to_i) if $1
      write_attribute(:year_suffix, $2) if $2
      write_attribute(:year, value) if self.year.blank?
    else
      write_attribute(:year, value)
    end
  end

  # @param [String] value
  # @return [String]
  def month=(value)
    v = Utilities::Dates::SHORT_MONTH_FILTER[value]
    v = v.to_s if !v.nil?
    write_attribute(:month, v)
  end

  # Used only on import from BibTeX records
  # @param [String] value
  # @return [String]
  def note=(value)
    write_attribute(:note, value)
    if !self.note.blank? && self.new_record?
      if value.include?('||')
        a = value.split(/||/)
        a.each do |n|
          self.notes.build({text: n + ' [Created on import from BibTeX.]'})
        end
      else
        self.notes.build({text: value + ' [Created on import from BibTeX.]'})
      end
    end
  end

  # @param [String] value
  # @return [String]
  def isbn=(value)
    write_attribute(:isbn, value)
    unless value.blank?
      if tw_isbn = self.identifiers.where(type: 'Identifier::Global::Isbn').first
        if tw_isbn.identifier != value
          tw_isbn.destroy!
          self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
      end
    end
  end

  # @return [String]
  def isbn
    identifier_string_of_type('Identifier::Global::Isbn')
  end

  # @param [String] value
  # @return [String]
  def doi=(value)
    write_attribute(:doi, value)
    unless value.blank?
      if tw_doi = self.identifiers.where(type: 'Identifier::Global::Doi').first
        if tw_doi.identifier != value
          tw_doi.destroy!
          self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
      end
    end
  end

  # @return [String]
  def doi
    identifier_string_of_type('Identifier::Global::Doi')
  end

  # @todo Are ISSN only Serials now? Maybe - the raw bibtex source may come in with an ISSN in which case
  # we need to set the serial based on ISSN.
  # @param [String] value
  # @return [String]
  def issn=(value)
    write_attribute(:issn, value)
    unless value.blank?
      tw_issn = self.identifiers.where(type: 'Identifier::Global::Issn').first
      unless tw_issn.nil? || tw_issn.identifier != value
        tw_issn.destroy
      end
      self.identifiers.build(type: 'Identifier::Global::Issn', identifier: value)
    end
  end

  # @return [String]
  def issn
    identifier_string_of_type('Identifier::Global::Issn')
  end

  # turn bibtex URL field into a Ruby URI object
  # @return [URI]
  def url_as_uri
    URI(self.url) unless self.url.blank?
  end

  # @param [String] type_value
  # @return [Identifier]
  #   the identifier of this type, relies on Identifier to enforce has_one for Global identifiers
  #   !! behaviour for Identifier::Local types may be unexpected
  def identifier_string_of_type(type_value)
    # Also handle in memory
    identifiers.each do |i|
      return i.identifier if i.type == type_value
    end
    nil
    # identifiers.where(type: type_value).first&.identifier
  end

 #endregion getters & setters

  # @return [Boolean]
  # is there a bibtex author or author roles?
  def has_authors?
    return true if !author.blank?
    return false if new_record?
    # self exists in the db
    authors.count > 0 ? true : false
  end

  # @return [Boolean]
  def has_editors?
    return true if editor
    # editor attribute is empty
    return false if new_record? # WHY!?
    # self exists in the db
    editors.count > 0 ? true : false
  end

  # @return [Boolean]
  #  true contains either an author or editor
  def has_writer?
    (has_authors? || has_editors?) ? true : false
  end

  # @return [Boolean]
  def has_some_year? # is there a year or stated year?
    return false if year.blank? && stated_year.blank?
    true
  end

  # @return [Integer]
  #  The effective year of publication as per nomenclatural rules
  def nomenclature_year
    cached_nomenclature_date.year
  end

  # @return [Date || Time] <sigh>
  #  An memoizer, getter for cached_nomenclature_date, computes if not .persisted?
  def cached_nomenclature_date
    if !persisted?
      nomenclature_date
    else
      read_attribute(:cached_nomenclature_date)
    end
  end

  # rubocop:disable Metrics/MethodLength
  # @return [BibTeX::Entry, false]
  #   !! Entry equivalent to self, this should round-trip with no changes.
  def to_bibtex
    return false if bibtex_type.nil?
    b = BibTeX::Entry.new(bibtex_type: bibtex_type)

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank?
        b[f] = v
      end
    end

    b[:keywords] = verbatim_keywords unless verbatim_keywords.blank?
    b[:note] = concatenated_notes_string unless concatenated_notes_string.blank?

    unless serial.nil?
      b[:journal] = serial.name
      issns  = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    unless serial.nil?
      b[:journal] = serial.name
      issns = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    uris = identifiers.where(type: 'Identifier::Global::Uri')
    unless uris.empty?
      b[:url] = uris.first.identifier # TW only allows one URI per object
    end

    isbns = identifiers.where(type: 'Identifier::Global::Isbn')
    unless isbns.empty?
      b[:isbn] = isbns.first.identifier # TW only allows one ISBN per object
    end

    dois = identifiers.where(type: 'Identifier::Global::Doi') #.of_type(:isbn)
    unless dois.empty?
      b[:doi] = dois.first.identifier # TW only allows one DOI per object
    end

    # Overiden by `author` and `editor` if present
    b.author = get_bibtex_names('author') if author_roles.load.any? # unless (!authors.load.any? && author.blank?)
    b.editor = get_bibtex_names('editor') if editor_roles.load.any? # unless (!editors.load.any? && editor.blank?)

    # TODO: use global_id or replace with UUID or DOI if available
    b.key = id unless new_record?
    b
  end

  # @return Hash
  #   a to_citeproc with values updated for literal
  #   handling via `{}` in TaxonWorks
  def to_citeproc(normalize_names = true)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names

    a = b.to_citeproc

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank? && (v =~ /\A{(.*)}\z/)
        a[f.to_s] = {literal: $1}
      end
    end

    a['year-suffix'] = year_suffix unless year_suffix.blank?
    a['original-date'] = {"date-parts" => [[ stated_year ]]} unless stated_year.blank?
    a['language'] = Language.find(language_id).english_name.to_s unless language_id.nil?
    a['translated-title'] = alternate_values.where(type: "AlternateValue::Translation", alternate_value_object_attribute: 'title').pluck(:value).first
    a['note'] = note unless note.blank?
    a
  end

  # @return [String, nil]
  #  priority is Person, string
  #  !! Not the cached value !!
  def get_author
    a = authors.load
    if a.any?
      get_bibtex_names('author')
    else
      author.blank? ? nil : author
    end
  end

  # @return [BibTex::Bibliography]
  #   initialized with this Source as an entry
  def bibtex_bibliography
    TaxonWorks::Vendor::BibtexRuby.bibliography([self])
 end

  # @param [String] style
  # @param [String] format
  # @return [String]
  #   this source, rendered in the provided CSL style, as text
  def render_with_style(style = 'vancouver', format = 'text', normalize_names = true)
    s = ::TaxonWorks::Vendor::BibtexRuby.get_style(style)
    cp = CiteProc::Processor.new(style: s, format: format)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names
    cp.import( [to_citeproc(normalize_names)] )
    cp.render(:bibliography, id: cp.items.keys.first).first.strip
  end

  # @param [String] format
  # @return [String]
  #   a full representation, using bibtex
  # String must be length > 0
  def cached_string(format = 'text')
    return nil unless (format == 'text') || (format == 'html')
    str = render_with_style(DEFAULT_CSL_STYLE, format)
    str.sub('(0ADAD)', '') # citeproc renders year 0000 as (0ADAD)
  end

  # @return [String, nil]
  #   last names formatted as displayed in nomenclatural authority (iczn), prioritizes
  #   normalized People before BibTeX `author`
  #   !! This is NOT a legal BibTeX format  !!
  def authority_name(reload = true)
    reload ? authors.reload : authors.load
    if !authors.any? # no normalized people, use string, !! not .any? because of in-memory setting?!
      if author.blank?
        return nil
      else
        b = to_bibtex
        ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b)
        return Utilities::Strings.authorship_sentence(b.author.tokens.collect{ |t| t.last })
      end
    else # use normalized records
      return Utilities::Strings.authorship_sentence(authors.collect{ |a| a.full_last_name })
    end
  end

  protected

  def validate_year_suffix
    a = get_author
    unless year_suffix.blank? || year.blank? || a.blank?
      if new_record?
        s = Source.where(author: a, year: year, year_suffix: year_suffix).first
      else
        s = Source.where(author: a, year: year, year_suffix: year_suffix).not_self(self).first
      end
      errors.add(:year_suffix, " '#{year_suffix}' is already used for #{a} #{year}") unless s.nil?
    end
  end

  def italics_are_paired
    l = title.scan('<i>')&.count
    r = title.scan('</i>')&.count
    errors.add(:title, 'italic markup is not paired') unless l == r
  end

  # @param [String] type either `author` or `editor`
  # @return [String]
  #   The BibTeX version of the name strings created from People
  #   BibTeX format is 'lastname, firstname and lastname, firstname and lastname, firstname'
  #   This only references People, i.e. `authors` and `editors`.
  #   !! Do not adapt to reference the BibTeX attributes `author` or `editor`
  def get_bibtex_names(role_type)
    # so, we can not reload here
    send("#{role_type}s").collect{ |a| a.bibtex_name}.join(' and ')
  end

  # @return [Ignored]
  def create_authors
    begin
      Person.transaction do
        authors_to_create.each do |shs|
          p = Person.create!(shs)
          author_roles.build(person: p)
        end
      end
    rescue
      errors.add(:base, 'invalid author parameters')
    end
  end

  # TODO: Replace with taxonworks.csl.  Move unsupported fields to
  # wrappers in vue rendering.
  # set cached values and copies active record relations into bibtex values
  # @return [Ignored]
  def set_cached
    if errors.empty?
      attributes_to_update = {}
      attributes_to_update[:author] = get_bibtex_names('author') if authors.reload.size > 0
      attributes_to_update[:editor] = get_bibtex_names('editor') if editors.reload.size > 0
      attributes_to_update.merge!(
        cached: get_cached,
        cached_nomenclature_date: nomenclature_date,
        cached_author_string: authority_name(false)
      )
      update_columns(attributes_to_update)
    end
  end

  def get_cached
    if errors.empty?
      c = cached_string('html') # preserves our convention of <i>
      return c
    end
    nil
  end

  #region hard validations

  # must have at least one of the required fields (TW_REQUIRED_FIELDS)
  # @return [Ignored]
  def check_has_field
    valid = false
    TW_REQUIRED_FIELDS.each do |i|
      if !self[i].blank?
        valid = true
        break
      end
    end
    #TODO This test for auth doesn't work with a new record.
    if (self.authors.count > 0 || self.editors.count > 0 || !self.serial.nil?)
      valid = true
    end
    if !valid
      errors.add(
        :base,
        'Missing core data. A TaxonWorks source must have one of the following: author, editor, booktitle, title, url, journal, year, or stated year'
      )
    end
  end

  def sv_cached_names # this cannot be moved to soft_validation_extensions
    is_cached = true

    if author.to_s != get_bibtex_names('author') ||
        editor.to_s != get_bibtex_names('editor') ||
        cached != get_cached ||
        cached_nomenclature_date != nomenclature_date ||
        cached_author_string.to_s != authority_name(false)
      is_cached = false
    end

    soft_validations.add(
      :base, 'Cached values should be updated',
      success_message: 'Cached values were updated',
      failure_message:  'Failed to update cached values') if !is_cached
  end
end

#author ⇒ `String`^?

“Last name, FirstName MiddleName”. FirstName and MiddleName can be initials. Additional authors are joined with ` and `. All names before the comma are treated as a single last name.

The contents of `author` follow the following rules:

`author` (a) and `authors` (People) (b) can both be used to generate the author string
if a & !b then `author` = a verbatim (and therefor may not match the BibTeX format)
if !a & b then `author` = b, collected and rendered in BibTeX format
if a & b then `author` = b, collected and rendered in BibTeX format on each update. !! Updates to `author` directly will be overwritten !!

`author` is automatically populated from `authors` if the latter is provided !! This is different behavious from TaxonName, where `verbatim_author` has priority over taxon_name_author (People) in rendering.

#authors_to_create ⇒ `Object`

DEFAULT_CSL_STYLE = 'zootaxa'



308
309
310

# File 'app/models/source/bibtex.rb', line 308

def authors_to_create
  @authors_to_create
end

#bibtex_type ⇒ `String`

Returns one of VALID_BIBTEX_TYPES (config/initializers/constants/_controlled_vocabularies/bibtex_constants.rb, keys there are symbols).

Returns:

(String) —

one of VALID_BIBTEX_TYPES (config/initializers/constants/_controlled_vocabularies/bibtex_constants.rb, keys there are symbols)

# File 'app/models/source/bibtex.rb', line 302

class Source::Bibtex < Source

  # Type will change
  DEFAULT_CSL_STYLE = 'taxonworks'
  #DEFAULT_CSL_STYLE = 'zootaxa'

  attr_accessor :authors_to_create

  include Shared::OriginRelationship
  include Source::Bibtex::SoftValidationExtensions::Instance
  extend Source::Bibtex::SoftValidationExtensions::Klass

  is_origin_for 'Source::Bibtex', 'Source::Verbatim'
  originates_from 'Source::Bibtex', 'Source::Verbatim'

  GRAPH_ENTRY_POINTS = [:origin_relationships]

  # Used in soft validation
  BIBTEX_REQUIRED_FIELDS = {
    article: [:author, :title, :journal, :year],
    book: [:author, :editor, :title, :publisher, :year],
    booklet: [:title],
    conference: [:author, :title, :booktitle, :year],
    inbook: [:author, :editor, :title, :chapter, :pages, :publisher, :year],
    incollection: [:author, :title, :booktitle, :publisher, :year],
    inproceedings:  [:author, :title, :booktitle, :year],
    manual: [:title],
    mastersthesis: [:author, :title, :school, :year],
    misc: [],
    phdthesis: [:author, :title, :school, :year],
    proceedings: [:title, :year],
    techreport: [:author,:title,:institution, :year],
    unpublished: [:author, :title, :note]
  }

  # TW required fields (must have one of these fields filled in)
  # either year or stated_year is acceptable
  TW_REQUIRED_FIELDS = [:author, :editor, :booktitle, :title, :url, :journal, :year, :stated_year].freeze

  IGNORE_SIMILAR = [:verbatim, :cached, :cached_author_string, :cached_nomenclature_date].freeze
  IGNORE_IDENTICAL = IGNORE_SIMILAR.dup.freeze

  belongs_to :serial, inverse_of: :sources

  # handle conflict with BibTex language field.
  belongs_to :source_language, class_name: 'Language', foreign_key: :language_id, inverse_of: :sources

  has_many :author_roles, -> { order('roles.position ASC') }, class_name: 'SourceAuthor',
    as: :role_object, validate: true

  has_many :authors, -> { order('roles.position ASC') }, through: :author_roles, source: :person, validate: true

  has_many :editor_roles, -> { order('roles.position ASC') }, class_name: 'SourceEditor',
    as: :role_object, validate: true
  has_many :editors, -> { order('roles.position ASC') }, through: :editor_roles, source: :person, validate: true

  accepts_nested_attributes_for :authors, :editors, :author_roles, :editor_roles, allow_destroy: true

  before_validation :create_authors, if: -> { !authors_to_create.nil? }
  before_validation :check_has_field

  validates_inclusion_of :bibtex_type,
    in: ::VALID_BIBTEX_TYPES,
    message: '"%{value}" is not a valid source type'

  validates_presence_of :year,
    if: -> { !month.blank? || !stated_year.blank? },
    message: 'is required when month or stated_year is provided'

  validates :year, date_year: {
    min_year: 1000, max_year: Time.now.year + 2,
    message: 'must be an integer greater than 999 and no more than 2 years in the future'}

  validates_presence_of :month,
    unless: -> { day.blank? },
    message: 'is required when day is provided'

  validates_inclusion_of :month,
    in: ::VALID_BIBTEX_MONTHS,
    allow_blank: true,
    message: ' month'

  validates :day, date_day: {year_sym: :year, month_sym: :month},
            unless: -> { year.blank? || month.blank? }

  validates :url, format: {
    with: URI::regexp(%w(http https ftp)),
    message: '[%{value}] is not a valid URL'}, allow_blank: true

  validate :italics_are_paired, unless: -> { title.blank? }
  validate :validate_year_suffix, unless: -> { self.no_year_suffix_validation || (self.type != 'Source::Bibtex') }

  # includes nil last, exclude it explicitly with another condition if need be
  scope :order_by_nomenclature_date, -> { order(:cached_nomenclature_date) }

  # @param [BibTeX::Name] bibtex_author
  # @return [Person, Boolean] new person, or false
  def self.bibtex_author_to_person(bibtex_author)
    return false if bibtex_author.class != BibTeX::Name
    p = Person.new(
      first_name: bibtex_author.first,
      prefix: bibtex_author.prefix,
      last_name: bibtex_author.last,
      suffix: bibtex_author.suffix)
    p.namecase_names
    p
  end

  # @return [BibTeX::Entry]
  def self.new_from_bibtex_text(text = nil)
    a = BibTeX::Bibliography.parse(text, filter: :latex).first
    new_from_bibtex(a)
  end

  # Instantiates a Source::Bibtex instance from a BibTeX::Entry
  # Note:
  #    * note conversion is handled in note setter.
  #    * identifiers are handled in associated setter.
  #    * !! Unrecognized attributes are added as import attributes.
  #
  # Usage:
  #    a = BibTeX::Entry.new(bibtex_type: 'book', title: 'Foos of Bar America', author: 'Smith, James', year: 1921)
  #    b = Source::Bibtex.new_from_bibtex(a)
  #
  # @param [BibTex::Entry] bibtex_entry the BibTex::Entry to convert
  # @return [Source::BibTex.new] a new instance
  # @todo annote to project specific note?
  # @todo if it finds one & only one match for serial assigns the serial ID, and if not it just store in journal title
  # serial with alternate_value on name .count = 1 assign .first
  # before validate assign serial if matching & not doesn't have a serial currently assigned.
  # @todo if there is an ISSN it should look up to see it the serial already exists.
  def self.new_from_bibtex(bibtex_entry = nil)
    return false if !bibtex_entry.kind_of?(::BibTeX::Entry)

    s = Source::Bibtex.new(bibtex_type: bibtex_entry.type.to_s)

    import_attributes = []

    bibtex_entry.fields.each do |key, value|
      if key == :keywords
        s.verbatim_keywords = value
        next
      end

      v = value.to_s.strip
      if s.respond_to?(key.to_sym) && key != :type
        s.send("#{key}=", v)
      else
        import_attributes.push({import_predicate: key, value: v, type: 'ImportAttribute'})
      end
    end
    s.data_attributes_attributes = import_attributes
    s
  end

  # @return [Array] journal, nil or name
  def journal
    [read_attribute(:journal), (serial.blank? ? nil : serial.name)].compact.first
  end

  # @return [String]
  def verbatim_journal
    read_attribute(:journal)
  end

  # @return [Boolean]
  #   whether the BibTeX::Entry representation of this source is valid
  def valid_bibtex?
    to_bibtex.valid?
  end

  # @return [String] A string that represents the year with suffix as seen in a BibTeX bibliography.
  #   returns "" if neither :year or :year_suffix are set.
  def year_with_suffix
    [year, year_suffix].compact.join
  end

  # @return [String] A string that represents the authors last_names and year (no suffix)
  def author_year
    return 'not yet calculated' if new_record?
    [cached_author_string, year].compact.join(', ')
  end

  # TODO: Not used
  #
  # Modified from build, the issues with polymorphic has_many and build
  # are more than we want to tackle right now.
  #
  # @return [Array, Boolean] of names, or false
  def create_related_people_and_roles
    return false if !self.valid? ||
      self.new_record? ||
      (self.author.blank? && self.editor.blank?) ||
      self.roles.count > 0

    bibtex = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(bibtex)

    begin
      Role.transaction do
        if bibtex.authors
          bibtex.authors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceAuthor.create!(role_object: self, person: p)
          end
        end

        if bibtex.editors
          bibtex.editors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceEditor.create!(role_object: self, person: p)
          end
        end
      end
    rescue ActiveRecord::RecordInvalid
      raise
    end
    true
  end

  #region getters & setters

  # @param [String, Integer] value
  # @return [Integer] value of year
  def year=(value)
    if value.class == String
      value =~ /\A(\d\d\d\d)([a-zA-Z]*)\z/
      write_attribute(:year, $1.to_i) if $1
      write_attribute(:year_suffix, $2) if $2
      write_attribute(:year, value) if self.year.blank?
    else
      write_attribute(:year, value)
    end
  end

  # @param [String] value
  # @return [String]
  def month=(value)
    v = Utilities::Dates::SHORT_MONTH_FILTER[value]
    v = v.to_s if !v.nil?
    write_attribute(:month, v)
  end

  # Used only on import from BibTeX records
  # @param [String] value
  # @return [String]
  def note=(value)
    write_attribute(:note, value)
    if !self.note.blank? && self.new_record?
      if value.include?('||')
        a = value.split(/||/)
        a.each do |n|
          self.notes.build({text: n + ' [Created on import from BibTeX.]'})
        end
      else
        self.notes.build({text: value + ' [Created on import from BibTeX.]'})
      end
    end
  end

  # @param [String] value
  # @return [String]
  def isbn=(value)
    write_attribute(:isbn, value)
    unless value.blank?
      if tw_isbn = self.identifiers.where(type: 'Identifier::Global::Isbn').first
        if tw_isbn.identifier != value
          tw_isbn.destroy!
          self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
      end
    end
  end

  # @return [String]
  def isbn
    identifier_string_of_type('Identifier::Global::Isbn')
  end

  # @param [String] value
  # @return [String]
  def doi=(value)
    write_attribute(:doi, value)
    unless value.blank?
      if tw_doi = self.identifiers.where(type: 'Identifier::Global::Doi').first
        if tw_doi.identifier != value
          tw_doi.destroy!
          self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
      end
    end
  end

  # @return [String]
  def doi
    identifier_string_of_type('Identifier::Global::Doi')
  end

  # @todo Are ISSN only Serials now? Maybe - the raw bibtex source may come in with an ISSN in which case
  # we need to set the serial based on ISSN.
  # @param [String] value
  # @return [String]
  def issn=(value)
    write_attribute(:issn, value)
    unless value.blank?
      tw_issn = self.identifiers.where(type: 'Identifier::Global::Issn').first
      unless tw_issn.nil? || tw_issn.identifier != value
        tw_issn.destroy
      end
      self.identifiers.build(type: 'Identifier::Global::Issn', identifier: value)
    end
  end

  # @return [String]
  def issn
    identifier_string_of_type('Identifier::Global::Issn')
  end

  # turn bibtex URL field into a Ruby URI object
  # @return [URI]
  def url_as_uri
    URI(self.url) unless self.url.blank?
  end

  # @param [String] type_value
  # @return [Identifier]
  #   the identifier of this type, relies on Identifier to enforce has_one for Global identifiers
  #   !! behaviour for Identifier::Local types may be unexpected
  def identifier_string_of_type(type_value)
    # Also handle in memory
    identifiers.each do |i|
      return i.identifier if i.type == type_value
    end
    nil
    # identifiers.where(type: type_value).first&.identifier
  end

 #endregion getters & setters

  # @return [Boolean]
  # is there a bibtex author or author roles?
  def has_authors?
    return true if !author.blank?
    return false if new_record?
    # self exists in the db
    authors.count > 0 ? true : false
  end

  # @return [Boolean]
  def has_editors?
    return true if editor
    # editor attribute is empty
    return false if new_record? # WHY!?
    # self exists in the db
    editors.count > 0 ? true : false
  end

  # @return [Boolean]
  #  true contains either an author or editor
  def has_writer?
    (has_authors? || has_editors?) ? true : false
  end

  # @return [Boolean]
  def has_some_year? # is there a year or stated year?
    return false if year.blank? && stated_year.blank?
    true
  end

  # @return [Integer]
  #  The effective year of publication as per nomenclatural rules
  def nomenclature_year
    cached_nomenclature_date.year
  end

  # @return [Date || Time] <sigh>
  #  An memoizer, getter for cached_nomenclature_date, computes if not .persisted?
  def cached_nomenclature_date
    if !persisted?
      nomenclature_date
    else
      read_attribute(:cached_nomenclature_date)
    end
  end

  # rubocop:disable Metrics/MethodLength
  # @return [BibTeX::Entry, false]
  #   !! Entry equivalent to self, this should round-trip with no changes.
  def to_bibtex
    return false if bibtex_type.nil?
    b = BibTeX::Entry.new(bibtex_type: bibtex_type)

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank?
        b[f] = v
      end
    end

    b[:keywords] = verbatim_keywords unless verbatim_keywords.blank?
    b[:note] = concatenated_notes_string unless concatenated_notes_string.blank?

    unless serial.nil?
      b[:journal] = serial.name
      issns  = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    unless serial.nil?
      b[:journal] = serial.name
      issns = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    uris = identifiers.where(type: 'Identifier::Global::Uri')
    unless uris.empty?
      b[:url] = uris.first.identifier # TW only allows one URI per object
    end

    isbns = identifiers.where(type: 'Identifier::Global::Isbn')
    unless isbns.empty?
      b[:isbn] = isbns.first.identifier # TW only allows one ISBN per object
    end

    dois = identifiers.where(type: 'Identifier::Global::Doi') #.of_type(:isbn)
    unless dois.empty?
      b[:doi] = dois.first.identifier # TW only allows one DOI per object
    end

    # Overiden by `author` and `editor` if present
    b.author = get_bibtex_names('author') if author_roles.load.any? # unless (!authors.load.any? && author.blank?)
    b.editor = get_bibtex_names('editor') if editor_roles.load.any? # unless (!editors.load.any? && editor.blank?)

    # TODO: use global_id or replace with UUID or DOI if available
    b.key = id unless new_record?
    b
  end

  # @return Hash
  #   a to_citeproc with values updated for literal
  #   handling via `{}` in TaxonWorks
  def to_citeproc(normalize_names = true)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names

    a = b.to_citeproc

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank? && (v =~ /\A{(.*)}\z/)
        a[f.to_s] = {literal: $1}
      end
    end

    a['year-suffix'] = year_suffix unless year_suffix.blank?
    a['original-date'] = {"date-parts" => [[ stated_year ]]} unless stated_year.blank?
    a['language'] = Language.find(language_id).english_name.to_s unless language_id.nil?
    a['translated-title'] = alternate_values.where(type: "AlternateValue::Translation", alternate_value_object_attribute: 'title').pluck(:value).first
    a['note'] = note unless note.blank?
    a
  end

  # @return [String, nil]
  #  priority is Person, string
  #  !! Not the cached value !!
  def get_author
    a = authors.load
    if a.any?
      get_bibtex_names('author')
    else
      author.blank? ? nil : author
    end
  end

  # @return [BibTex::Bibliography]
  #   initialized with this Source as an entry
  def bibtex_bibliography
    TaxonWorks::Vendor::BibtexRuby.bibliography([self])
 end

  # @param [String] style
  # @param [String] format
  # @return [String]
  #   this source, rendered in the provided CSL style, as text
  def render_with_style(style = 'vancouver', format = 'text', normalize_names = true)
    s = ::TaxonWorks::Vendor::BibtexRuby.get_style(style)
    cp = CiteProc::Processor.new(style: s, format: format)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names
    cp.import( [to_citeproc(normalize_names)] )
    cp.render(:bibliography, id: cp.items.keys.first).first.strip
  end

  # @param [String] format
  # @return [String]
  #   a full representation, using bibtex
  # String must be length > 0
  def cached_string(format = 'text')
    return nil unless (format == 'text') || (format == 'html')
    str = render_with_style(DEFAULT_CSL_STYLE, format)
    str.sub('(0ADAD)', '') # citeproc renders year 0000 as (0ADAD)
  end

  # @return [String, nil]
  #   last names formatted as displayed in nomenclatural authority (iczn), prioritizes
  #   normalized People before BibTeX `author`
  #   !! This is NOT a legal BibTeX format  !!
  def authority_name(reload = true)
    reload ? authors.reload : authors.load
    if !authors.any? # no normalized people, use string, !! not .any? because of in-memory setting?!
      if author.blank?
        return nil
      else
        b = to_bibtex
        ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b)
        return Utilities::Strings.authorship_sentence(b.author.tokens.collect{ |t| t.last })
      end
    else # use normalized records
      return Utilities::Strings.authorship_sentence(authors.collect{ |a| a.full_last_name })
    end
  end

  protected

  def validate_year_suffix
    a = get_author
    unless year_suffix.blank? || year.blank? || a.blank?
      if new_record?
        s = Source.where(author: a, year: year, year_suffix: year_suffix).first
      else
        s = Source.where(author: a, year: year, year_suffix: year_suffix).not_self(self).first
      end
      errors.add(:year_suffix, " '#{year_suffix}' is already used for #{a} #{year}") unless s.nil?
    end
  end

  def italics_are_paired
    l = title.scan('<i>')&.count
    r = title.scan('</i>')&.count
    errors.add(:title, 'italic markup is not paired') unless l == r
  end

  # @param [String] type either `author` or `editor`
  # @return [String]
  #   The BibTeX version of the name strings created from People
  #   BibTeX format is 'lastname, firstname and lastname, firstname and lastname, firstname'
  #   This only references People, i.e. `authors` and `editors`.
  #   !! Do not adapt to reference the BibTeX attributes `author` or `editor`
  def get_bibtex_names(role_type)
    # so, we can not reload here
    send("#{role_type}s").collect{ |a| a.bibtex_name}.join(' and ')
  end

  # @return [Ignored]
  def create_authors
    begin
      Person.transaction do
        authors_to_create.each do |shs|
          p = Person.create!(shs)
          author_roles.build(person: p)
        end
      end
    rescue
      errors.add(:base, 'invalid author parameters')
    end
  end

  # TODO: Replace with taxonworks.csl.  Move unsupported fields to
  # wrappers in vue rendering.
  # set cached values and copies active record relations into bibtex values
  # @return [Ignored]
  def set_cached
    if errors.empty?
      attributes_to_update = {}
      attributes_to_update[:author] = get_bibtex_names('author') if authors.reload.size > 0
      attributes_to_update[:editor] = get_bibtex_names('editor') if editors.reload.size > 0
      attributes_to_update.merge!(
        cached: get_cached,
        cached_nomenclature_date: nomenclature_date,
        cached_author_string: authority_name(false)
      )
      update_columns(attributes_to_update)
    end
  end

  def get_cached
    if errors.empty?
      c = cached_string('html') # preserves our convention of <i>
      return c
    end
    nil
  end

  #region hard validations

  # must have at least one of the required fields (TW_REQUIRED_FIELDS)
  # @return [Ignored]
  def check_has_field
    valid = false
    TW_REQUIRED_FIELDS.each do |i|
      if !self[i].blank?
        valid = true
        break
      end
    end
    #TODO This test for auth doesn't work with a new record.
    if (self.authors.count > 0 || self.editors.count > 0 || !self.serial.nil?)
      valid = true
    end
    if !valid
      errors.add(
        :base,
        'Missing core data. A TaxonWorks source must have one of the following: author, editor, booktitle, title, url, journal, year, or stated year'
      )
    end
  end

  def sv_cached_names # this cannot be moved to soft_validation_extensions
    is_cached = true

    if author.to_s != get_bibtex_names('author') ||
        editor.to_s != get_bibtex_names('editor') ||
        cached != get_cached ||
        cached_nomenclature_date != nomenclature_date ||
        cached_author_string.to_s != authority_name(false)
      is_cached = false
    end

    soft_validations.add(
      :base, 'Cached values should be updated',
      success_message: 'Cached values were updated',
      failure_message:  'Failed to update cached values') if !is_cached
  end
end

#booktitle ⇒ `nil`

@return the title of the book BibTeX standard field (required for types: )(optional for types:) A TW required attribute (TW requires a value in one of the required attributes.) Title of a book, part of which is being cited. See the LaTEX book for how to type titles. For book entries, use the title field instead.

Returns:

(nil) —

means the attribute is not stored in the database.

# File 'app/models/source/bibtex.rb', line 302

class Source::Bibtex < Source

  # Type will change
  DEFAULT_CSL_STYLE = 'taxonworks'
  #DEFAULT_CSL_STYLE = 'zootaxa'

  attr_accessor :authors_to_create

  include Shared::OriginRelationship
  include Source::Bibtex::SoftValidationExtensions::Instance
  extend Source::Bibtex::SoftValidationExtensions::Klass

  is_origin_for 'Source::Bibtex', 'Source::Verbatim'
  originates_from 'Source::Bibtex', 'Source::Verbatim'

  GRAPH_ENTRY_POINTS = [:origin_relationships]

  # Used in soft validation
  BIBTEX_REQUIRED_FIELDS = {
    article: [:author, :title, :journal, :year],
    book: [:author, :editor, :title, :publisher, :year],
    booklet: [:title],
    conference: [:author, :title, :booktitle, :year],
    inbook: [:author, :editor, :title, :chapter, :pages, :publisher, :year],
    incollection: [:author, :title, :booktitle, :publisher, :year],
    inproceedings:  [:author, :title, :booktitle, :year],
    manual: [:title],
    mastersthesis: [:author, :title, :school, :year],
    misc: [],
    phdthesis: [:author, :title, :school, :year],
    proceedings: [:title, :year],
    techreport: [:author,:title,:institution, :year],
    unpublished: [:author, :title, :note]
  }

  # TW required fields (must have one of these fields filled in)
  # either year or stated_year is acceptable
  TW_REQUIRED_FIELDS = [:author, :editor, :booktitle, :title, :url, :journal, :year, :stated_year].freeze

  IGNORE_SIMILAR = [:verbatim, :cached, :cached_author_string, :cached_nomenclature_date].freeze
  IGNORE_IDENTICAL = IGNORE_SIMILAR.dup.freeze

  belongs_to :serial, inverse_of: :sources

  # handle conflict with BibTex language field.
  belongs_to :source_language, class_name: 'Language', foreign_key: :language_id, inverse_of: :sources

  has_many :author_roles, -> { order('roles.position ASC') }, class_name: 'SourceAuthor',
    as: :role_object, validate: true

  has_many :authors, -> { order('roles.position ASC') }, through: :author_roles, source: :person, validate: true

  has_many :editor_roles, -> { order('roles.position ASC') }, class_name: 'SourceEditor',
    as: :role_object, validate: true
  has_many :editors, -> { order('roles.position ASC') }, through: :editor_roles, source: :person, validate: true

  accepts_nested_attributes_for :authors, :editors, :author_roles, :editor_roles, allow_destroy: true

  before_validation :create_authors, if: -> { !authors_to_create.nil? }
  before_validation :check_has_field

  validates_inclusion_of :bibtex_type,
    in: ::VALID_BIBTEX_TYPES,
    message: '"%{value}" is not a valid source type'

  validates_presence_of :year,
    if: -> { !month.blank? || !stated_year.blank? },
    message: 'is required when month or stated_year is provided'

  validates :year, date_year: {
    min_year: 1000, max_year: Time.now.year + 2,
    message: 'must be an integer greater than 999 and no more than 2 years in the future'}

  validates_presence_of :month,
    unless: -> { day.blank? },
    message: 'is required when day is provided'

  validates_inclusion_of :month,
    in: ::VALID_BIBTEX_MONTHS,
    allow_blank: true,
    message: ' month'

  validates :day, date_day: {year_sym: :year, month_sym: :month},
            unless: -> { year.blank? || month.blank? }

  validates :url, format: {
    with: URI::regexp(%w(http https ftp)),
    message: '[%{value}] is not a valid URL'}, allow_blank: true

  validate :italics_are_paired, unless: -> { title.blank? }
  validate :validate_year_suffix, unless: -> { self.no_year_suffix_validation || (self.type != 'Source::Bibtex') }

  # includes nil last, exclude it explicitly with another condition if need be
  scope :order_by_nomenclature_date, -> { order(:cached_nomenclature_date) }

  # @param [BibTeX::Name] bibtex_author
  # @return [Person, Boolean] new person, or false
  def self.bibtex_author_to_person(bibtex_author)
    return false if bibtex_author.class != BibTeX::Name
    p = Person.new(
      first_name: bibtex_author.first,
      prefix: bibtex_author.prefix,
      last_name: bibtex_author.last,
      suffix: bibtex_author.suffix)
    p.namecase_names
    p
  end

  # @return [BibTeX::Entry]
  def self.new_from_bibtex_text(text = nil)
    a = BibTeX::Bibliography.parse(text, filter: :latex).first
    new_from_bibtex(a)
  end

  # Instantiates a Source::Bibtex instance from a BibTeX::Entry
  # Note:
  #    * note conversion is handled in note setter.
  #    * identifiers are handled in associated setter.
  #    * !! Unrecognized attributes are added as import attributes.
  #
  # Usage:
  #    a = BibTeX::Entry.new(bibtex_type: 'book', title: 'Foos of Bar America', author: 'Smith, James', year: 1921)
  #    b = Source::Bibtex.new_from_bibtex(a)
  #
  # @param [BibTex::Entry] bibtex_entry the BibTex::Entry to convert
  # @return [Source::BibTex.new] a new instance
  # @todo annote to project specific note?
  # @todo if it finds one & only one match for serial assigns the serial ID, and if not it just store in journal title
  # serial with alternate_value on name .count = 1 assign .first
  # before validate assign serial if matching & not doesn't have a serial currently assigned.
  # @todo if there is an ISSN it should look up to see it the serial already exists.
  def self.new_from_bibtex(bibtex_entry = nil)
    return false if !bibtex_entry.kind_of?(::BibTeX::Entry)

    s = Source::Bibtex.new(bibtex_type: bibtex_entry.type.to_s)

    import_attributes = []

    bibtex_entry.fields.each do |key, value|
      if key == :keywords
        s.verbatim_keywords = value
        next
      end

      v = value.to_s.strip
      if s.respond_to?(key.to_sym) && key != :type
        s.send("#{key}=", v)
      else
        import_attributes.push({import_predicate: key, value: v, type: 'ImportAttribute'})
      end
    end
    s.data_attributes_attributes = import_attributes
    s
  end

  # @return [Array] journal, nil or name
  def journal
    [read_attribute(:journal), (serial.blank? ? nil : serial.name)].compact.first
  end

  # @return [String]
  def verbatim_journal
    read_attribute(:journal)
  end

  # @return [Boolean]
  #   whether the BibTeX::Entry representation of this source is valid
  def valid_bibtex?
    to_bibtex.valid?
  end

  # @return [String] A string that represents the year with suffix as seen in a BibTeX bibliography.
  #   returns "" if neither :year or :year_suffix are set.
  def year_with_suffix
    [year, year_suffix].compact.join
  end

  # @return [String] A string that represents the authors last_names and year (no suffix)
  def author_year
    return 'not yet calculated' if new_record?
    [cached_author_string, year].compact.join(', ')
  end

  # TODO: Not used
  #
  # Modified from build, the issues with polymorphic has_many and build
  # are more than we want to tackle right now.
  #
  # @return [Array, Boolean] of names, or false
  def create_related_people_and_roles
    return false if !self.valid? ||
      self.new_record? ||
      (self.author.blank? && self.editor.blank?) ||
      self.roles.count > 0

    bibtex = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(bibtex)

    begin
      Role.transaction do
        if bibtex.authors
          bibtex.authors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceAuthor.create!(role_object: self, person: p)
          end
        end

        if bibtex.editors
          bibtex.editors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceEditor.create!(role_object: self, person: p)
          end
        end
      end
    rescue ActiveRecord::RecordInvalid
      raise
    end
    true
  end

  #region getters & setters

  # @param [String, Integer] value
  # @return [Integer] value of year
  def year=(value)
    if value.class == String
      value =~ /\A(\d\d\d\d)([a-zA-Z]*)\z/
      write_attribute(:year, $1.to_i) if $1
      write_attribute(:year_suffix, $2) if $2
      write_attribute(:year, value) if self.year.blank?
    else
      write_attribute(:year, value)
    end
  end

  # @param [String] value
  # @return [String]
  def month=(value)
    v = Utilities::Dates::SHORT_MONTH_FILTER[value]
    v = v.to_s if !v.nil?
    write_attribute(:month, v)
  end

  # Used only on import from BibTeX records
  # @param [String] value
  # @return [String]
  def note=(value)
    write_attribute(:note, value)
    if !self.note.blank? && self.new_record?
      if value.include?('||')
        a = value.split(/||/)
        a.each do |n|
          self.notes.build({text: n + ' [Created on import from BibTeX.]'})
        end
      else
        self.notes.build({text: value + ' [Created on import from BibTeX.]'})
      end
    end
  end

  # @param [String] value
  # @return [String]
  def isbn=(value)
    write_attribute(:isbn, value)
    unless value.blank?
      if tw_isbn = self.identifiers.where(type: 'Identifier::Global::Isbn').first
        if tw_isbn.identifier != value
          tw_isbn.destroy!
          self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
      end
    end
  end

  # @return [String]
  def isbn
    identifier_string_of_type('Identifier::Global::Isbn')
  end

  # @param [String] value
  # @return [String]
  def doi=(value)
    write_attribute(:doi, value)
    unless value.blank?
      if tw_doi = self.identifiers.where(type: 'Identifier::Global::Doi').first
        if tw_doi.identifier != value
          tw_doi.destroy!
          self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
      end
    end
  end

  # @return [String]
  def doi
    identifier_string_of_type('Identifier::Global::Doi')
  end

  # @todo Are ISSN only Serials now? Maybe - the raw bibtex source may come in with an ISSN in which case
  # we need to set the serial based on ISSN.
  # @param [String] value
  # @return [String]
  def issn=(value)
    write_attribute(:issn, value)
    unless value.blank?
      tw_issn = self.identifiers.where(type: 'Identifier::Global::Issn').first
      unless tw_issn.nil? || tw_issn.identifier != value
        tw_issn.destroy
      end
      self.identifiers.build(type: 'Identifier::Global::Issn', identifier: value)
    end
  end

  # @return [String]
  def issn
    identifier_string_of_type('Identifier::Global::Issn')
  end

  # turn bibtex URL field into a Ruby URI object
  # @return [URI]
  def url_as_uri
    URI(self.url) unless self.url.blank?
  end

  # @param [String] type_value
  # @return [Identifier]
  #   the identifier of this type, relies on Identifier to enforce has_one for Global identifiers
  #   !! behaviour for Identifier::Local types may be unexpected
  def identifier_string_of_type(type_value)
    # Also handle in memory
    identifiers.each do |i|
      return i.identifier if i.type == type_value
    end
    nil
    # identifiers.where(type: type_value).first&.identifier
  end

 #endregion getters & setters

  # @return [Boolean]
  # is there a bibtex author or author roles?
  def has_authors?
    return true if !author.blank?
    return false if new_record?
    # self exists in the db
    authors.count > 0 ? true : false
  end

  # @return [Boolean]
  def has_editors?
    return true if editor
    # editor attribute is empty
    return false if new_record? # WHY!?
    # self exists in the db
    editors.count > 0 ? true : false
  end

  # @return [Boolean]
  #  true contains either an author or editor
  def has_writer?
    (has_authors? || has_editors?) ? true : false
  end

  # @return [Boolean]
  def has_some_year? # is there a year or stated year?
    return false if year.blank? && stated_year.blank?
    true
  end

  # @return [Integer]
  #  The effective year of publication as per nomenclatural rules
  def nomenclature_year
    cached_nomenclature_date.year
  end

  # @return [Date || Time] <sigh>
  #  An memoizer, getter for cached_nomenclature_date, computes if not .persisted?
  def cached_nomenclature_date
    if !persisted?
      nomenclature_date
    else
      read_attribute(:cached_nomenclature_date)
    end
  end

  # rubocop:disable Metrics/MethodLength
  # @return [BibTeX::Entry, false]
  #   !! Entry equivalent to self, this should round-trip with no changes.
  def to_bibtex
    return false if bibtex_type.nil?
    b = BibTeX::Entry.new(bibtex_type: bibtex_type)

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank?
        b[f] = v
      end
    end

    b[:keywords] = verbatim_keywords unless verbatim_keywords.blank?
    b[:note] = concatenated_notes_string unless concatenated_notes_string.blank?

    unless serial.nil?
      b[:journal] = serial.name
      issns  = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    unless serial.nil?
      b[:journal] = serial.name
      issns = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    uris = identifiers.where(type: 'Identifier::Global::Uri')
    unless uris.empty?
      b[:url] = uris.first.identifier # TW only allows one URI per object
    end

    isbns = identifiers.where(type: 'Identifier::Global::Isbn')
    unless isbns.empty?
      b[:isbn] = isbns.first.identifier # TW only allows one ISBN per object
    end

    dois = identifiers.where(type: 'Identifier::Global::Doi') #.of_type(:isbn)
    unless dois.empty?
      b[:doi] = dois.first.identifier # TW only allows one DOI per object
    end

    # Overiden by `author` and `editor` if present
    b.author = get_bibtex_names('author') if author_roles.load.any? # unless (!authors.load.any? && author.blank?)
    b.editor = get_bibtex_names('editor') if editor_roles.load.any? # unless (!editors.load.any? && editor.blank?)

    # TODO: use global_id or replace with UUID or DOI if available
    b.key = id unless new_record?
    b
  end

  # @return Hash
  #   a to_citeproc with values updated for literal
  #   handling via `{}` in TaxonWorks
  def to_citeproc(normalize_names = true)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names

    a = b.to_citeproc

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank? && (v =~ /\A{(.*)}\z/)
        a[f.to_s] = {literal: $1}
      end
    end

    a['year-suffix'] = year_suffix unless year_suffix.blank?
    a['original-date'] = {"date-parts" => [[ stated_year ]]} unless stated_year.blank?
    a['language'] = Language.find(language_id).english_name.to_s unless language_id.nil?
    a['translated-title'] = alternate_values.where(type: "AlternateValue::Translation", alternate_value_object_attribute: 'title').pluck(:value).first
    a['note'] = note unless note.blank?
    a
  end

  # @return [String, nil]
  #  priority is Person, string
  #  !! Not the cached value !!
  def get_author
    a = authors.load
    if a.any?
      get_bibtex_names('author')
    else
      author.blank? ? nil : author
    end
  end

  # @return [BibTex::Bibliography]
  #   initialized with this Source as an entry
  def bibtex_bibliography
    TaxonWorks::Vendor::BibtexRuby.bibliography([self])
 end

  # @param [String] style
  # @param [String] format
  # @return [String]
  #   this source, rendered in the provided CSL style, as text
  def render_with_style(style = 'vancouver', format = 'text', normalize_names = true)
    s = ::TaxonWorks::Vendor::BibtexRuby.get_style(style)
    cp = CiteProc::Processor.new(style: s, format: format)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names
    cp.import( [to_citeproc(normalize_names)] )
    cp.render(:bibliography, id: cp.items.keys.first).first.strip
  end

  # @param [String] format
  # @return [String]
  #   a full representation, using bibtex
  # String must be length > 0
  def cached_string(format = 'text')
    return nil unless (format == 'text') || (format == 'html')
    str = render_with_style(DEFAULT_CSL_STYLE, format)
    str.sub('(0ADAD)', '') # citeproc renders year 0000 as (0ADAD)
  end

  # @return [String, nil]
  #   last names formatted as displayed in nomenclatural authority (iczn), prioritizes
  #   normalized People before BibTeX `author`
  #   !! This is NOT a legal BibTeX format  !!
  def authority_name(reload = true)
    reload ? authors.reload : authors.load
    if !authors.any? # no normalized people, use string, !! not .any? because of in-memory setting?!
      if author.blank?
        return nil
      else
        b = to_bibtex
        ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b)
        return Utilities::Strings.authorship_sentence(b.author.tokens.collect{ |t| t.last })
      end
    else # use normalized records
      return Utilities::Strings.authorship_sentence(authors.collect{ |a| a.full_last_name })
    end
  end

  protected

  def validate_year_suffix
    a = get_author
    unless year_suffix.blank? || year.blank? || a.blank?
      if new_record?
        s = Source.where(author: a, year: year, year_suffix: year_suffix).first
      else
        s = Source.where(author: a, year: year, year_suffix: year_suffix).not_self(self).first
      end
      errors.add(:year_suffix, " '#{year_suffix}' is already used for #{a} #{year}") unless s.nil?
    end
  end

  def italics_are_paired
    l = title.scan('<i>')&.count
    r = title.scan('</i>')&.count
    errors.add(:title, 'italic markup is not paired') unless l == r
  end

  # @param [String] type either `author` or `editor`
  # @return [String]
  #   The BibTeX version of the name strings created from People
  #   BibTeX format is 'lastname, firstname and lastname, firstname and lastname, firstname'
  #   This only references People, i.e. `authors` and `editors`.
  #   !! Do not adapt to reference the BibTeX attributes `author` or `editor`
  def get_bibtex_names(role_type)
    # so, we can not reload here
    send("#{role_type}s").collect{ |a| a.bibtex_name}.join(' and ')
  end

  # @return [Ignored]
  def create_authors
    begin
      Person.transaction do
        authors_to_create.each do |shs|
          p = Person.create!(shs)
          author_roles.build(person: p)
        end
      end
    rescue
      errors.add(:base, 'invalid author parameters')
    end
  end

  # TODO: Replace with taxonworks.csl.  Move unsupported fields to
  # wrappers in vue rendering.
  # set cached values and copies active record relations into bibtex values
  # @return [Ignored]
  def set_cached
    if errors.empty?
      attributes_to_update = {}
      attributes_to_update[:author] = get_bibtex_names('author') if authors.reload.size > 0
      attributes_to_update[:editor] = get_bibtex_names('editor') if editors.reload.size > 0
      attributes_to_update.merge!(
        cached: get_cached,
        cached_nomenclature_date: nomenclature_date,
        cached_author_string: authority_name(false)
      )
      update_columns(attributes_to_update)
    end
  end

  def get_cached
    if errors.empty?
      c = cached_string('html') # preserves our convention of <i>
      return c
    end
    nil
  end

  #region hard validations

  # must have at least one of the required fields (TW_REQUIRED_FIELDS)
  # @return [Ignored]
  def check_has_field
    valid = false
    TW_REQUIRED_FIELDS.each do |i|
      if !self[i].blank?
        valid = true
        break
      end
    end
    #TODO This test for auth doesn't work with a new record.
    if (self.authors.count > 0 || self.editors.count > 0 || !self.serial.nil?)
      valid = true
    end
    if !valid
      errors.add(
        :base,
        'Missing core data. A TaxonWorks source must have one of the following: author, editor, booktitle, title, url, journal, year, or stated year'
      )
    end
  end

  def sv_cached_names # this cannot be moved to soft_validation_extensions
    is_cached = true

    if author.to_s != get_bibtex_names('author') ||
        editor.to_s != get_bibtex_names('editor') ||
        cached != get_cached ||
        cached_nomenclature_date != nomenclature_date ||
        cached_author_string.to_s != authority_name(false)
      is_cached = false
    end

    soft_validations.add(
      :base, 'Cached values should be updated',
      success_message: 'Cached values were updated',
      failure_message:  'Failed to update cached values') if !is_cached
  end
end

#chapter ⇒ `String`^?

BibTeX standard field (required for types: )(optional for types:) A chapter (or section or whatever) number.

Returns:

(String) —

the chapter or section number.
(nil) —

means the attribute is not stored in the database.

# File 'app/models/source/bibtex.rb', line 302

class Source::Bibtex < Source

  # Type will change
  DEFAULT_CSL_STYLE = 'taxonworks'
  #DEFAULT_CSL_STYLE = 'zootaxa'

  attr_accessor :authors_to_create

  include Shared::OriginRelationship
  include Source::Bibtex::SoftValidationExtensions::Instance
  extend Source::Bibtex::SoftValidationExtensions::Klass

  is_origin_for 'Source::Bibtex', 'Source::Verbatim'
  originates_from 'Source::Bibtex', 'Source::Verbatim'

  GRAPH_ENTRY_POINTS = [:origin_relationships]

  # Used in soft validation
  BIBTEX_REQUIRED_FIELDS = {
    article: [:author, :title, :journal, :year],
    book: [:author, :editor, :title, :publisher, :year],
    booklet: [:title],
    conference: [:author, :title, :booktitle, :year],
    inbook: [:author, :editor, :title, :chapter, :pages, :publisher, :year],
    incollection: [:author, :title, :booktitle, :publisher, :year],
    inproceedings:  [:author, :title, :booktitle, :year],
    manual: [:title],
    mastersthesis: [:author, :title, :school, :year],
    misc: [],
    phdthesis: [:author, :title, :school, :year],
    proceedings: [:title, :year],
    techreport: [:author,:title,:institution, :year],
    unpublished: [:author, :title, :note]
  }

  # TW required fields (must have one of these fields filled in)
  # either year or stated_year is acceptable
  TW_REQUIRED_FIELDS = [:author, :editor, :booktitle, :title, :url, :journal, :year, :stated_year].freeze

  IGNORE_SIMILAR = [:verbatim, :cached, :cached_author_string, :cached_nomenclature_date].freeze
  IGNORE_IDENTICAL = IGNORE_SIMILAR.dup.freeze

  belongs_to :serial, inverse_of: :sources

  # handle conflict with BibTex language field.
  belongs_to :source_language, class_name: 'Language', foreign_key: :language_id, inverse_of: :sources

  has_many :author_roles, -> { order('roles.position ASC') }, class_name: 'SourceAuthor',
    as: :role_object, validate: true

  has_many :authors, -> { order('roles.position ASC') }, through: :author_roles, source: :person, validate: true

  has_many :editor_roles, -> { order('roles.position ASC') }, class_name: 'SourceEditor',
    as: :role_object, validate: true
  has_many :editors, -> { order('roles.position ASC') }, through: :editor_roles, source: :person, validate: true

  accepts_nested_attributes_for :authors, :editors, :author_roles, :editor_roles, allow_destroy: true

  before_validation :create_authors, if: -> { !authors_to_create.nil? }
  before_validation :check_has_field

  validates_inclusion_of :bibtex_type,
    in: ::VALID_BIBTEX_TYPES,
    message: '"%{value}" is not a valid source type'

  validates_presence_of :year,
    if: -> { !month.blank? || !stated_year.blank? },
    message: 'is required when month or stated_year is provided'

  validates :year, date_year: {
    min_year: 1000, max_year: Time.now.year + 2,
    message: 'must be an integer greater than 999 and no more than 2 years in the future'}

  validates_presence_of :month,
    unless: -> { day.blank? },
    message: 'is required when day is provided'

  validates_inclusion_of :month,
    in: ::VALID_BIBTEX_MONTHS,
    allow_blank: true,
    message: ' month'

  validates :day, date_day: {year_sym: :year, month_sym: :month},
            unless: -> { year.blank? || month.blank? }

  validates :url, format: {
    with: URI::regexp(%w(http https ftp)),
    message: '[%{value}] is not a valid URL'}, allow_blank: true

  validate :italics_are_paired, unless: -> { title.blank? }
  validate :validate_year_suffix, unless: -> { self.no_year_suffix_validation || (self.type != 'Source::Bibtex') }

  # includes nil last, exclude it explicitly with another condition if need be
  scope :order_by_nomenclature_date, -> { order(:cached_nomenclature_date) }

  # @param [BibTeX::Name] bibtex_author
  # @return [Person, Boolean] new person, or false
  def self.bibtex_author_to_person(bibtex_author)
    return false if bibtex_author.class != BibTeX::Name
    p = Person.new(
      first_name: bibtex_author.first,
      prefix: bibtex_author.prefix,
      last_name: bibtex_author.last,
      suffix: bibtex_author.suffix)
    p.namecase_names
    p
  end

  # @return [BibTeX::Entry]
  def self.new_from_bibtex_text(text = nil)
    a = BibTeX::Bibliography.parse(text, filter: :latex).first
    new_from_bibtex(a)
  end

  # Instantiates a Source::Bibtex instance from a BibTeX::Entry
  # Note:
  #    * note conversion is handled in note setter.
  #    * identifiers are handled in associated setter.
  #    * !! Unrecognized attributes are added as import attributes.
  #
  # Usage:
  #    a = BibTeX::Entry.new(bibtex_type: 'book', title: 'Foos of Bar America', author: 'Smith, James', year: 1921)
  #    b = Source::Bibtex.new_from_bibtex(a)
  #
  # @param [BibTex::Entry] bibtex_entry the BibTex::Entry to convert
  # @return [Source::BibTex.new] a new instance
  # @todo annote to project specific note?
  # @todo if it finds one & only one match for serial assigns the serial ID, and if not it just store in journal title
  # serial with alternate_value on name .count = 1 assign .first
  # before validate assign serial if matching & not doesn't have a serial currently assigned.
  # @todo if there is an ISSN it should look up to see it the serial already exists.
  def self.new_from_bibtex(bibtex_entry = nil)
    return false if !bibtex_entry.kind_of?(::BibTeX::Entry)

    s = Source::Bibtex.new(bibtex_type: bibtex_entry.type.to_s)

    import_attributes = []

    bibtex_entry.fields.each do |key, value|
      if key == :keywords
        s.verbatim_keywords = value
        next
      end

      v = value.to_s.strip
      if s.respond_to?(key.to_sym) && key != :type
        s.send("#{key}=", v)
      else
        import_attributes.push({import_predicate: key, value: v, type: 'ImportAttribute'})
      end
    end
    s.data_attributes_attributes = import_attributes
    s
  end

  # @return [Array] journal, nil or name
  def journal
    [read_attribute(:journal), (serial.blank? ? nil : serial.name)].compact.first
  end

  # @return [String]
  def verbatim_journal
    read_attribute(:journal)
  end

  # @return [Boolean]
  #   whether the BibTeX::Entry representation of this source is valid
  def valid_bibtex?
    to_bibtex.valid?
  end

  # @return [String] A string that represents the year with suffix as seen in a BibTeX bibliography.
  #   returns "" if neither :year or :year_suffix are set.
  def year_with_suffix
    [year, year_suffix].compact.join
  end

  # @return [String] A string that represents the authors last_names and year (no suffix)
  def author_year
    return 'not yet calculated' if new_record?
    [cached_author_string, year].compact.join(', ')
  end

  # TODO: Not used
  #
  # Modified from build, the issues with polymorphic has_many and build
  # are more than we want to tackle right now.
  #
  # @return [Array, Boolean] of names, or false
  def create_related_people_and_roles
    return false if !self.valid? ||
      self.new_record? ||
      (self.author.blank? && self.editor.blank?) ||
      self.roles.count > 0

    bibtex = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(bibtex)

    begin
      Role.transaction do
        if bibtex.authors
          bibtex.authors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceAuthor.create!(role_object: self, person: p)
          end
        end

        if bibtex.editors
          bibtex.editors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceEditor.create!(role_object: self, person: p)
          end
        end
      end
    rescue ActiveRecord::RecordInvalid
      raise
    end
    true
  end

  #region getters & setters

  # @param [String, Integer] value
  # @return [Integer] value of year
  def year=(value)
    if value.class == String
      value =~ /\A(\d\d\d\d)([a-zA-Z]*)\z/
      write_attribute(:year, $1.to_i) if $1
      write_attribute(:year_suffix, $2) if $2
      write_attribute(:year, value) if self.year.blank?
    else
      write_attribute(:year, value)
    end
  end

  # @param [String] value
  # @return [String]
  def month=(value)
    v = Utilities::Dates::SHORT_MONTH_FILTER[value]
    v = v.to_s if !v.nil?
    write_attribute(:month, v)
  end

  # Used only on import from BibTeX records
  # @param [String] value
  # @return [String]
  def note=(value)
    write_attribute(:note, value)
    if !self.note.blank? && self.new_record?
      if value.include?('||')
        a = value.split(/||/)
        a.each do |n|
          self.notes.build({text: n + ' [Created on import from BibTeX.]'})
        end
      else
        self.notes.build({text: value + ' [Created on import from BibTeX.]'})
      end
    end
  end

  # @param [String] value
  # @return [String]
  def isbn=(value)
    write_attribute(:isbn, value)
    unless value.blank?
      if tw_isbn = self.identifiers.where(type: 'Identifier::Global::Isbn').first
        if tw_isbn.identifier != value
          tw_isbn.destroy!
          self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
      end
    end
  end

  # @return [String]
  def isbn
    identifier_string_of_type('Identifier::Global::Isbn')
  end

  # @param [String] value
  # @return [String]
  def doi=(value)
    write_attribute(:doi, value)
    unless value.blank?
      if tw_doi = self.identifiers.where(type: 'Identifier::Global::Doi').first
        if tw_doi.identifier != value
          tw_doi.destroy!
          self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
      end
    end
  end

  # @return [String]
  def doi
    identifier_string_of_type('Identifier::Global::Doi')
  end

  # @todo Are ISSN only Serials now? Maybe - the raw bibtex source may come in with an ISSN in which case
  # we need to set the serial based on ISSN.
  # @param [String] value
  # @return [String]
  def issn=(value)
    write_attribute(:issn, value)
    unless value.blank?
      tw_issn = self.identifiers.where(type: 'Identifier::Global::Issn').first
      unless tw_issn.nil? || tw_issn.identifier != value
        tw_issn.destroy
      end
      self.identifiers.build(type: 'Identifier::Global::Issn', identifier: value)
    end
  end

  # @return [String]
  def issn
    identifier_string_of_type('Identifier::Global::Issn')
  end

  # turn bibtex URL field into a Ruby URI object
  # @return [URI]
  def url_as_uri
    URI(self.url) unless self.url.blank?
  end

  # @param [String] type_value
  # @return [Identifier]
  #   the identifier of this type, relies on Identifier to enforce has_one for Global identifiers
  #   !! behaviour for Identifier::Local types may be unexpected
  def identifier_string_of_type(type_value)
    # Also handle in memory
    identifiers.each do |i|
      return i.identifier if i.type == type_value
    end
    nil
    # identifiers.where(type: type_value).first&.identifier
  end

 #endregion getters & setters

  # @return [Boolean]
  # is there a bibtex author or author roles?
  def has_authors?
    return true if !author.blank?
    return false if new_record?
    # self exists in the db
    authors.count > 0 ? true : false
  end

  # @return [Boolean]
  def has_editors?
    return true if editor
    # editor attribute is empty
    return false if new_record? # WHY!?
    # self exists in the db
    editors.count > 0 ? true : false
  end

  # @return [Boolean]
  #  true contains either an author or editor
  def has_writer?
    (has_authors? || has_editors?) ? true : false
  end

  # @return [Boolean]
  def has_some_year? # is there a year or stated year?
    return false if year.blank? && stated_year.blank?
    true
  end

  # @return [Integer]
  #  The effective year of publication as per nomenclatural rules
  def nomenclature_year
    cached_nomenclature_date.year
  end

  # @return [Date || Time] <sigh>
  #  An memoizer, getter for cached_nomenclature_date, computes if not .persisted?
  def cached_nomenclature_date
    if !persisted?
      nomenclature_date
    else
      read_attribute(:cached_nomenclature_date)
    end
  end

  # rubocop:disable Metrics/MethodLength
  # @return [BibTeX::Entry, false]
  #   !! Entry equivalent to self, this should round-trip with no changes.
  def to_bibtex
    return false if bibtex_type.nil?
    b = BibTeX::Entry.new(bibtex_type: bibtex_type)

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank?
        b[f] = v
      end
    end

    b[:keywords] = verbatim_keywords unless verbatim_keywords.blank?
    b[:note] = concatenated_notes_string unless concatenated_notes_string.blank?

    unless serial.nil?
      b[:journal] = serial.name
      issns  = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    unless serial.nil?
      b[:journal] = serial.name
      issns = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    uris = identifiers.where(type: 'Identifier::Global::Uri')
    unless uris.empty?
      b[:url] = uris.first.identifier # TW only allows one URI per object
    end

    isbns = identifiers.where(type: 'Identifier::Global::Isbn')
    unless isbns.empty?
      b[:isbn] = isbns.first.identifier # TW only allows one ISBN per object
    end

    dois = identifiers.where(type: 'Identifier::Global::Doi') #.of_type(:isbn)
    unless dois.empty?
      b[:doi] = dois.first.identifier # TW only allows one DOI per object
    end

    # Overiden by `author` and `editor` if present
    b.author = get_bibtex_names('author') if author_roles.load.any? # unless (!authors.load.any? && author.blank?)
    b.editor = get_bibtex_names('editor') if editor_roles.load.any? # unless (!editors.load.any? && editor.blank?)

    # TODO: use global_id or replace with UUID or DOI if available
    b.key = id unless new_record?
    b
  end

  # @return Hash
  #   a to_citeproc with values updated for literal
  #   handling via `{}` in TaxonWorks
  def to_citeproc(normalize_names = true)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names

    a = b.to_citeproc

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank? && (v =~ /\A{(.*)}\z/)
        a[f.to_s] = {literal: $1}
      end
    end

    a['year-suffix'] = year_suffix unless year_suffix.blank?
    a['original-date'] = {"date-parts" => [[ stated_year ]]} unless stated_year.blank?
    a['language'] = Language.find(language_id).english_name.to_s unless language_id.nil?
    a['translated-title'] = alternate_values.where(type: "AlternateValue::Translation", alternate_value_object_attribute: 'title').pluck(:value).first
    a['note'] = note unless note.blank?
    a
  end

  # @return [String, nil]
  #  priority is Person, string
  #  !! Not the cached value !!
  def get_author
    a = authors.load
    if a.any?
      get_bibtex_names('author')
    else
      author.blank? ? nil : author
    end
  end

  # @return [BibTex::Bibliography]
  #   initialized with this Source as an entry
  def bibtex_bibliography
    TaxonWorks::Vendor::BibtexRuby.bibliography([self])
 end

  # @param [String] style
  # @param [String] format
  # @return [String]
  #   this source, rendered in the provided CSL style, as text
  def render_with_style(style = 'vancouver', format = 'text', normalize_names = true)
    s = ::TaxonWorks::Vendor::BibtexRuby.get_style(style)
    cp = CiteProc::Processor.new(style: s, format: format)
    b = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b) if normalize_names
    cp.import( [to_citeproc(normalize_names)] )
    cp.render(:bibliography, id: cp.items.keys.first).first.strip
  end

  # @param [String] format
  # @return [String]
  #   a full representation, using bibtex
  # String must be length > 0
  def cached_string(format = 'text')
    return nil unless (format == 'text') || (format == 'html')
    str = render_with_style(DEFAULT_CSL_STYLE, format)
    str.sub('(0ADAD)', '') # citeproc renders year 0000 as (0ADAD)
  end

  # @return [String, nil]
  #   last names formatted as displayed in nomenclatural authority (iczn), prioritizes
  #   normalized People before BibTeX `author`
  #   !! This is NOT a legal BibTeX format  !!
  def authority_name(reload = true)
    reload ? authors.reload : authors.load
    if !authors.any? # no normalized people, use string, !! not .any? because of in-memory setting?!
      if author.blank?
        return nil
      else
        b = to_bibtex
        ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(b)
        return Utilities::Strings.authorship_sentence(b.author.tokens.collect{ |t| t.last })
      end
    else # use normalized records
      return Utilities::Strings.authorship_sentence(authors.collect{ |a| a.full_last_name })
    end
  end

  protected

  def validate_year_suffix
    a = get_author
    unless year_suffix.blank? || year.blank? || a.blank?
      if new_record?
        s = Source.where(author: a, year: year, year_suffix: year_suffix).first
      else
        s = Source.where(author: a, year: year, year_suffix: year_suffix).not_self(self).first
      end
      errors.add(:year_suffix, " '#{year_suffix}' is already used for #{a} #{year}") unless s.nil?
    end
  end

  def italics_are_paired
    l = title.scan('<i>')&.count
    r = title.scan('</i>')&.count
    errors.add(:title, 'italic markup is not paired') unless l == r
  end

  # @param [String] type either `author` or `editor`
  # @return [String]
  #   The BibTeX version of the name strings created from People
  #   BibTeX format is 'lastname, firstname and lastname, firstname and lastname, firstname'
  #   This only references People, i.e. `authors` and `editors`.
  #   !! Do not adapt to reference the BibTeX attributes `author` or `editor`
  def get_bibtex_names(role_type)
    # so, we can not reload here
    send("#{role_type}s").collect{ |a| a.bibtex_name}.join(' and ')
  end

  # @return [Ignored]
  def create_authors
    begin
      Person.transaction do
        authors_to_create.each do |shs|
          p = Person.create!(shs)
          author_roles.build(person: p)
        end
      end
    rescue
      errors.add(:base, 'invalid author parameters')
    end
  end

  # TODO: Replace with taxonworks.csl.  Move unsupported fields to
  # wrappers in vue rendering.
  # set cached values and copies active record relations into bibtex values
  # @return [Ignored]
  def set_cached
    if errors.empty?
      attributes_to_update = {}
      attributes_to_update[:author] = get_bibtex_names('author') if authors.reload.size > 0
      attributes_to_update[:editor] = get_bibtex_names('editor') if editors.reload.size > 0
      attributes_to_update.merge!(
        cached: get_cached,
        cached_nomenclature_date: nomenclature_date,
        cached_author_string: authority_name(false)
      )
      update_columns(attributes_to_update)
    end
  end

  def get_cached
    if errors.empty?
      c = cached_string('html') # preserves our convention of <i>
      return c
    end
    nil
  end

  #region hard validations

  # must have at least one of the required fields (TW_REQUIRED_FIELDS)
  # @return [Ignored]
  def check_has_field
    valid = false
    TW_REQUIRED_FIELDS.each do |i|
      if !self[i].blank?
        valid = true
        break
      end
    end
    #TODO This test for auth doesn't work with a new record.
    if (self.authors.count > 0 || self.editors.count > 0 || !self.serial.nil?)
      valid = true
    end
    if !valid
      errors.add(
        :base,
        'Missing core data. A TaxonWorks source must have one of the following: author, editor, booktitle, title, url, journal, year, or stated year'
      )
    end
  end

  def sv_cached_names # this cannot be moved to soft_validation_extensions
    is_cached = true

    if author.to_s != get_bibtex_names('author') ||
        editor.to_s != get_bibtex_names('editor') ||
        cached != get_cached ||
        cached_nomenclature_date != nomenclature_date ||
        cached_author_string.to_s != authority_name(false)
      is_cached = false
    end

    soft_validations.add(
      :base, 'Cached values should be updated',
      success_message: 'Cached values were updated',
      failure_message:  'Failed to update cached values') if !is_cached
  end
end

#copyright ⇒ `String`

TODO:

Returns:

(String)

# File 'app/models/source/bibtex.rb', line 302

class Source::Bibtex < Source

  # Type will change
  DEFAULT_CSL_STYLE = 'taxonworks'
  #DEFAULT_CSL_STYLE = 'zootaxa'

  attr_accessor :authors_to_create

  include Shared::OriginRelationship
  include Source::Bibtex::SoftValidationExtensions::Instance
  extend Source::Bibtex::SoftValidationExtensions::Klass

  is_origin_for 'Source::Bibtex', 'Source::Verbatim'
  originates_from 'Source::Bibtex', 'Source::Verbatim'

  GRAPH_ENTRY_POINTS = [:origin_relationships]

  # Used in soft validation
  BIBTEX_REQUIRED_FIELDS = {
    article: [:author, :title, :journal, :year],
    book: [:author, :editor, :title, :publisher, :year],
    booklet: [:title],
    conference: [:author, :title, :booktitle, :year],
    inbook: [:author, :editor, :title, :chapter, :pages, :publisher, :year],
    incollection: [:author, :title, :booktitle, :publisher, :year],
    inproceedings:  [:author, :title, :booktitle, :year],
    manual: [:title],
    mastersthesis: [:author, :title, :school, :year],
    misc: [],
    phdthesis: [:author, :title, :school, :year],
    proceedings: [:title, :year],
    techreport: [:author,:title,:institution, :year],
    unpublished: [:author, :title, :note]
  }

  # TW required fields (must have one of these fields filled in)
  # either year or stated_year is acceptable
  TW_REQUIRED_FIELDS = [:author, :editor, :booktitle, :title, :url, :journal, :year, :stated_year].freeze

  IGNORE_SIMILAR = [:verbatim, :cached, :cached_author_string, :cached_nomenclature_date].freeze
  IGNORE_IDENTICAL = IGNORE_SIMILAR.dup.freeze

  belongs_to :serial, inverse_of: :sources

  # handle conflict with BibTex language field.
  belongs_to :source_language, class_name: 'Language', foreign_key: :language_id, inverse_of: :sources

  has_many :author_roles, -> { order('roles.position ASC') }, class_name: 'SourceAuthor',
    as: :role_object, validate: true

  has_many :authors, -> { order('roles.position ASC') }, through: :author_roles, source: :person, validate: true

  has_many :editor_roles, -> { order('roles.position ASC') }, class_name: 'SourceEditor',
    as: :role_object, validate: true
  has_many :editors, -> { order('roles.position ASC') }, through: :editor_roles, source: :person, validate: true

  accepts_nested_attributes_for :authors, :editors, :author_roles, :editor_roles, allow_destroy: true

  before_validation :create_authors, if: -> { !authors_to_create.nil? }
  before_validation :check_has_field

  validates_inclusion_of :bibtex_type,
    in: ::VALID_BIBTEX_TYPES,
    message: '"%{value}" is not a valid source type'

  validates_presence_of :year,
    if: -> { !month.blank? || !stated_year.blank? },
    message: 'is required when month or stated_year is provided'

  validates :year, date_year: {
    min_year: 1000, max_year: Time.now.year + 2,
    message: 'must be an integer greater than 999 and no more than 2 years in the future'}

  validates_presence_of :month,
    unless: -> { day.blank? },
    message: 'is required when day is provided'

  validates_inclusion_of :month,
    in: ::VALID_BIBTEX_MONTHS,
    allow_blank: true,
    message: ' month'

  validates :day, date_day: {year_sym: :year, month_sym: :month},
            unless: -> { year.blank? || month.blank? }

  validates :url, format: {
    with: URI::regexp(%w(http https ftp)),
    message: '[%{value}] is not a valid URL'}, allow_blank: true

  validate :italics_are_paired, unless: -> { title.blank? }
  validate :validate_year_suffix, unless: -> { self.no_year_suffix_validation || (self.type != 'Source::Bibtex') }

  # includes nil last, exclude it explicitly with another condition if need be
  scope :order_by_nomenclature_date, -> { order(:cached_nomenclature_date) }

  # @param [BibTeX::Name] bibtex_author
  # @return [Person, Boolean] new person, or false
  def self.bibtex_author_to_person(bibtex_author)
    return false if bibtex_author.class != BibTeX::Name
    p = Person.new(
      first_name: bibtex_author.first,
      prefix: bibtex_author.prefix,
      last_name: bibtex_author.last,
      suffix: bibtex_author.suffix)
    p.namecase_names
    p
  end

  # @return [BibTeX::Entry]
  def self.new_from_bibtex_text(text = nil)
    a = BibTeX::Bibliography.parse(text, filter: :latex).first
    new_from_bibtex(a)
  end

  # Instantiates a Source::Bibtex instance from a BibTeX::Entry
  # Note:
  #    * note conversion is handled in note setter.
  #    * identifiers are handled in associated setter.
  #    * !! Unrecognized attributes are added as import attributes.
  #
  # Usage:
  #    a = BibTeX::Entry.new(bibtex_type: 'book', title: 'Foos of Bar America', author: 'Smith, James', year: 1921)
  #    b = Source::Bibtex.new_from_bibtex(a)
  #
  # @param [BibTex::Entry] bibtex_entry the BibTex::Entry to convert
  # @return [Source::BibTex.new] a new instance
  # @todo annote to project specific note?
  # @todo if it finds one & only one match for serial assigns the serial ID, and if not it just store in journal title
  # serial with alternate_value on name .count = 1 assign .first
  # before validate assign serial if matching & not doesn't have a serial currently assigned.
  # @todo if there is an ISSN it should look up to see it the serial already exists.
  def self.new_from_bibtex(bibtex_entry = nil)
    return false if !bibtex_entry.kind_of?(::BibTeX::Entry)

    s = Source::Bibtex.new(bibtex_type: bibtex_entry.type.to_s)

    import_attributes = []

    bibtex_entry.fields.each do |key, value|
      if key == :keywords
        s.verbatim_keywords = value
        next
      end

      v = value.to_s.strip
      if s.respond_to?(key.to_sym) && key != :type
        s.send("#{key}=", v)
      else
        import_attributes.push({import_predicate: key, value: v, type: 'ImportAttribute'})
      end
    end
    s.data_attributes_attributes = import_attributes
    s
  end

  # @return [Array] journal, nil or name
  def journal
    [read_attribute(:journal), (serial.blank? ? nil : serial.name)].compact.first
  end

  # @return [String]
  def verbatim_journal
    read_attribute(:journal)
  end

  # @return [Boolean]
  #   whether the BibTeX::Entry representation of this source is valid
  def valid_bibtex?
    to_bibtex.valid?
  end

  # @return [String] A string that represents the year with suffix as seen in a BibTeX bibliography.
  #   returns "" if neither :year or :year_suffix are set.
  def year_with_suffix
    [year, year_suffix].compact.join
  end

  # @return [String] A string that represents the authors last_names and year (no suffix)
  def author_year
    return 'not yet calculated' if new_record?
    [cached_author_string, year].compact.join(', ')
  end

  # TODO: Not used
  #
  # Modified from build, the issues with polymorphic has_many and build
  # are more than we want to tackle right now.
  #
  # @return [Array, Boolean] of names, or false
  def create_related_people_and_roles
    return false if !self.valid? ||
      self.new_record? ||
      (self.author.blank? && self.editor.blank?) ||
      self.roles.count > 0

    bibtex = to_bibtex
    ::TaxonWorks::Vendor::BibtexRuby.namecase_bibtex_entry(bibtex)

    begin
      Role.transaction do
        if bibtex.authors
          bibtex.authors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceAuthor.create!(role_object: self, person: p)
          end
        end

        if bibtex.editors
          bibtex.editors.each do |a|
            p = Source::Bibtex.bibtex_author_to_person(a)
            p.save!
            SourceEditor.create!(role_object: self, person: p)
          end
        end
      end
    rescue ActiveRecord::RecordInvalid
      raise
    end
    true
  end

  #region getters & setters

  # @param [String, Integer] value
  # @return [Integer] value of year
  def year=(value)
    if value.class == String
      value =~ /\A(\d\d\d\d)([a-zA-Z]*)\z/
      write_attribute(:year, $1.to_i) if $1
      write_attribute(:year_suffix, $2) if $2
      write_attribute(:year, value) if self.year.blank?
    else
      write_attribute(:year, value)
    end
  end

  # @param [String] value
  # @return [String]
  def month=(value)
    v = Utilities::Dates::SHORT_MONTH_FILTER[value]
    v = v.to_s if !v.nil?
    write_attribute(:month, v)
  end

  # Used only on import from BibTeX records
  # @param [String] value
  # @return [String]
  def note=(value)
    write_attribute(:note, value)
    if !self.note.blank? && self.new_record?
      if value.include?('||')
        a = value.split(/||/)
        a.each do |n|
          self.notes.build({text: n + ' [Created on import from BibTeX.]'})
        end
      else
        self.notes.build({text: value + ' [Created on import from BibTeX.]'})
      end
    end
  end

  # @param [String] value
  # @return [String]
  def isbn=(value)
    write_attribute(:isbn, value)
    unless value.blank?
      if tw_isbn = self.identifiers.where(type: 'Identifier::Global::Isbn').first
        if tw_isbn.identifier != value
          tw_isbn.destroy!
          self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Isbn', identifier: value)
      end
    end
  end

  # @return [String]
  def isbn
    identifier_string_of_type('Identifier::Global::Isbn')
  end

  # @param [String] value
  # @return [String]
  def doi=(value)
    write_attribute(:doi, value)
    unless value.blank?
      if tw_doi = self.identifiers.where(type: 'Identifier::Global::Doi').first
        if tw_doi.identifier != value
          tw_doi.destroy!
          self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
        end
      else
        self.identifiers.build(type: 'Identifier::Global::Doi', identifier: value)
      end
    end
  end

  # @return [String]
  def doi
    identifier_string_of_type('Identifier::Global::Doi')
  end

  # @todo Are ISSN only Serials now? Maybe - the raw bibtex source may come in with an ISSN in which case
  # we need to set the serial based on ISSN.
  # @param [String] value
  # @return [String]
  def issn=(value)
    write_attribute(:issn, value)
    unless value.blank?
      tw_issn = self.identifiers.where(type: 'Identifier::Global::Issn').first
      unless tw_issn.nil? || tw_issn.identifier != value
        tw_issn.destroy
      end
      self.identifiers.build(type: 'Identifier::Global::Issn', identifier: value)
    end
  end

  # @return [String]
  def issn
    identifier_string_of_type('Identifier::Global::Issn')
  end

  # turn bibtex URL field into a Ruby URI object
  # @return [URI]
  def url_as_uri
    URI(self.url) unless self.url.blank?
  end

  # @param [String] type_value
  # @return [Identifier]
  #   the identifier of this type, relies on Identifier to enforce has_one for Global identifiers
  #   !! behaviour for Identifier::Local types may be unexpected
  def identifier_string_of_type(type_value)
    # Also handle in memory
    identifiers.each do |i|
      return i.identifier if i.type == type_value
    end
    nil
    # identifiers.where(type: type_value).first&.identifier
  end

 #endregion getters & setters

  # @return [Boolean]
  # is there a bibtex author or author roles?
  def has_authors?
    return true if !author.blank?
    return false if new_record?
    # self exists in the db
    authors.count > 0 ? true : false
  end

  # @return [Boolean]
  def has_editors?
    return true if editor
    # editor attribute is empty
    return false if new_record? # WHY!?
    # self exists in the db
    editors.count > 0 ? true : false
  end

  # @return [Boolean]
  #  true contains either an author or editor
  def has_writer?
    (has_authors? || has_editors?) ? true : false
  end

  # @return [Boolean]
  def has_some_year? # is there a year or stated year?
    return false if year.blank? && stated_year.blank?
    true
  end

  # @return [Integer]
  #  The effective year of publication as per nomenclatural rules
  def nomenclature_year
    cached_nomenclature_date.year
  end

  # @return [Date || Time] <sigh>
  #  An memoizer, getter for cached_nomenclature_date, computes if not .persisted?
  def cached_nomenclature_date
    if !persisted?
      nomenclature_date
    else
      read_attribute(:cached_nomenclature_date)
    end
  end

  # rubocop:disable Metrics/MethodLength
  # @return [BibTeX::Entry, false]
  #   !! Entry equivalent to self, this should round-trip with no changes.
  def to_bibtex
    return false if bibtex_type.nil?
    b = BibTeX::Entry.new(bibtex_type: bibtex_type)

    ::BIBTEX_FIELDS.each do |f|
      next if f == :bibtex_type
      v = send(f)
      if !v.blank?
        b[f] = v
      end
    end

    b[:keywords] = verbatim_keywords unless verbatim_keywords.blank?
    b[:note] = concatenated_notes_string unless concatenated_notes_string.blank?

    unless serial.nil?
      b[:journal] = serial.name
      issns  = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    unless serial.nil?
      b[:journal] = serial.name
      issns = serial.identifiers.where(type: 'Identifier::Global::Issn')
      unless issns.empty?
        b[:issn] = issns.first.identifier # assuming the serial has only 1 ISSN
      end
    end

    uris = identifiers.where(type: 'Identifier::Global::Uri')
    unless uris.empty?
      b[:url] = uris.first.identifier # TW only allows one URI per object
    end

    isbns = identifiers.where(type: 'Identifier::Global::Isbn')
    unless isbns.empty?
      b[:isbn] = isbns.first.identifier # TW only allows one ISBN per object
    end

    dois = identifiers.where(type: 'Identifier::Global::Doi') #.of_type(:isbn)
    unless dois.empty?
      b[:doi] = dois.first.identifier # TW only allows one DOI per object
    end

    # Overiden by `author` and `editor` if present
    b.author = get_bibtex_names('author') if aut

Class: Source::Bibtex

Overview

Defined Under Namespace

Constant Summary collapse

Constants included from SoftValidationExtensions::Klass

Constants inherited from Source

Constants included from SoftValidation

Instance Attribute Summary collapse

Attributes inherited from Source

Attributes included from Housekeeping::Users

Class Method Summary collapse

Instance Method Summary collapse

Methods included from SoftValidationExtensions::Instance

Methods included from Shared::OriginRelationship

Methods inherited from Source

Methods included from SoftValidation

Methods included from Shared::HasPapertrail

Methods included from Shared::IsData

Methods included from Shared::HasRoles

Methods included from Shared::Documentation

Methods included from Shared::Tags

Methods included from Shared::Notes

Methods included from Shared::Identifiers

Methods included from Shared::DataAttributes

Methods included from Shared::AlternateValues

Methods included from Housekeeping::Timestamps

Methods included from Housekeeping::Users

Methods inherited from ApplicationRecord

Instance Attribute Details

#abstract ⇒ String

#address ⇒ #String?

#annote ⇒ String?

#author ⇒ String?

#authors_to_create ⇒ Object

#bibtex_type ⇒ String

#booktitle ⇒ nil

#chapter ⇒ String?

#copyright ⇒ String

#abstract ⇒ `String`

#address ⇒ `#String`^?

#annote ⇒ `String`^?

#author ⇒ `String`^?

#authors_to_create ⇒ `Object`

#bibtex_type ⇒ `String`

#booktitle ⇒ `nil`

#chapter ⇒ `String`^?

#copyright ⇒ `String`