psu-libraries/psulib_blacklight

# frozen_string_literal: true

class DocumentRis
  attr_reader :docs

  FIELD_TYPES = {
    'Archives/Manuscripts' => 'GEN',
    'Article' => 'EJOUR',
    'Audio' => 'SOUND',
    'Book' => 'BOOK',
    'Equipment' => 'GEN',
    'Games/Toys' => 'GEN',
    'Government Document' => 'GOVDOC',
    'Image' => 'GEN',
    'Instructional Material' => 'GEN',
    'Journal/Periodical' => 'JOUR',
    'Juvenile Book' => 'BOOK',
    'Kit' => 'GEN',
    'Maps, Atlases, Globes' => 'MAP',
    'Microfilm/Microfiche' => 'GEN',
    'Musical Score' => 'MUSIC',
    'Newspaper' => 'NEWS',
    'Other' => 'GEN',
    'Proceeding/Congress' => 'CONF',
    'Reporter' => 'GEN',
    'Statute' => 'STAT',
    'Thesis/Dissertation' => 'THES',
    'Video' => 'VIDEO'
  }.freeze

  def initialize(document)
    @document = document
    @docs = @document.first['response']['docs'].first
  end

  def ris_to_string
    string = ''
    string += tag_format('TY', type)
    string += tag_format('TI', title)
    string += tag_format('A1', primary_author)

    addl_authors&.each do |addl_author|
      string += tag_format('A2', addl_author)
    end

    string += tag_format('PY', publication_year)
    string += tag_format('PP', place_of_publication)
    string += tag_format('PB', publisher_name)
    string += tag_format('SN', identifier)
    string += tag_format('ET', edition)
    string += tag_format('Y2', access_date)
    string += tag_format('UR', url)
    string += "ER  -\r\n"
    string
  end

  private

    def tag_format(tag, value)
      return '' unless value

      "#{tag}  - #{value}\r\n"
    end

    def format
      docs['format'].first
    end

    def type
      FIELD_TYPES[format] if FIELD_TYPES.key?(format)
    end

    def title
      docs['title_245ab_tsim'].first
    end

    def primary_author
      docs['author_tsim']&.first
    end

    def addl_authors
      docs['author_addl_tsim']
    end

    def publication_year
      docs['pub_date_illiad_ssm']&.first
    end

    def place_of_publication
      docs['publication_place_ssm']&.first
    end

    def publisher_name
      docs['publisher_name_ssm']&.first
    end

    def identifier
      return docs['issn_ssm'].first if docs['issn_ssm']

      docs['isbn_valid_ssm']&.first
    end

    def edition
      docs['edition_display_ssm']&.first
    end

    def url
      "https://catalog.libraries.psu.edu/catalog/#{docs['id']}"
    end

    def access_date
      Time.now.strftime('%Y-%m-%d')
    end
end