class ChampSerializer < ActiveModel::Serializer
  include Rails.application.routes.url_helpers

  attributes :value

  has_one :type_de_champ

  has_many :geo_areas, if: :include_geo_areas?
  has_one :etablissement, if: :include_etablissement?
  has_one :entreprise, if: :include_etablissement?

  def value
    case object
    when GeoArea
      object.geometry.to_json
    when Champs::CarteChamp
      if object.geo_json.present?
        object.geo_json.to_json
      end
    when Champs::DecimalNumberChamp
      if object.value.present?
        object.value.to_f
      end
    when Champs::IntegerNumberChamp
      if object.value.present?
        object.value.to_i
      end
    when Champs::LinkedDropDownListChamp
      if object.value.present?
        { primary: object.primary_value, secondary: object.secondary_value }
      end
    when Champs::PieceJustificativeChamp
      if object.piece_justificative_file.attached?
        url_for(object.piece_justificative_file)
      end
    else
      object.value
    end
  end

  def type_de_champ
    case object
    when GeoArea
      legacy_type_de_champ
    else
      object.type_de_champ
    end
  end

  def etablissement
    object.etablissement
  end

  def entreprise
    object.etablissement&.entreprise
  end

  def include_etablissement?
    object.is_a?(Champs::SiretChamp)
  end

  def include_geo_areas?
    object.is_a?(Champs::CarteChamp)
  end

  private

  def legacy_type_de_champ
    {
      id: -1,
      libelle: legacy_carto_libelle,
      type_champ: legacy_carto_type_champ,
      order_place: -1,
      description: ''
    }
  end

  def legacy_carto_libelle
    if object.source == GeoArea.sources.fetch(:selection_utilisateur)
      'user geometry'
    else
      object.source.to_s.tr('_', ' ')
    end
  end

  def legacy_carto_type_champ
    if object.source == GeoArea.sources.fetch(:selection_utilisateur)
      'user_geometry'
    else
      object.source.to_s
    end
  end
end