# frozen_string_literal: true

module DossierChampsConcern
  extend ActiveSupport::Concern

  def champs_for_revision(scope: nil)
    champs_index = champs.group_by(&:stable_id)
    revision.types_de_champ_for(scope:)
      .flat_map { champs_index[_1.stable_id] || [] }
  end

  # Get all the champs values for the types de champ in the final list.
  # Dossier might not have corresponding champ – display nil.
  # To do so, we build a virtual champ when there is no value so we can call for_export with all indexes
  def champs_for_export(types_de_champ, row_id = nil)
    types_de_champ.flat_map do |type_de_champ|
      champ = champ_for_export(type_de_champ, row_id)
      type_de_champ.libelles_for_export.map do |(libelle, path)|
        [libelle, TypeDeChamp.champ_value_for_export(type_de_champ.type_champ, champ, path)]
      end
    end
  end

  def project_champ(type_de_champ, row_id)
    check_valid_row_id?(type_de_champ, row_id)
    champ = champs_by_public_id[type_de_champ.public_id(row_id)]
    if champ.nil?
      type_de_champ.build_champ(dossier: self, row_id:, updated_at: depose_at || created_at)
    else
      champ
    end
  end

  def project_champs_public
    revision.types_de_champ_public.map { project_champ(_1, nil) }
  end

  def project_champs_private
    revision.types_de_champ_private.map { project_champ(_1, nil) }
  end

  def project_rows_for(type_de_champ)
    return [] if !type_de_champ.repetition?

    children = revision.children_of(type_de_champ)
    row_ids = repetition_row_ids(type_de_champ)

    row_ids.map do |row_id|
      children.map { project_champ(_1, row_id) }
    end
  end

  def find_type_de_champ_by_stable_id(stable_id, scope = nil)
    case scope
    when :public
      revision.types_de_champ.public_only
    when :private
      revision.types_de_champ.private_only
    else
      revision.types_de_champ
    end.find_by!(stable_id:)
  end

  def champs_for_prefill(stable_ids)
    revision
      .types_de_champ
      .filter { _1.stable_id.in?(stable_ids) }
      .filter { !_1.child?(revision) }
      .map { _1.repetition? ? project_champ(_1, nil) : champ_for_update(_1, nil, updated_by: nil) }
  end

  def champ_for_update(type_de_champ, row_id, updated_by:)
    champ, attributes = champ_with_attributes_for_update(type_de_champ, row_id, updated_by:)
    champ.assign_attributes(attributes)
    champ
  end

  def update_champs_attributes(attributes, scope, updated_by:)
    champs_attributes = attributes.to_h.map do |public_id, attributes|
      champ_attributes_by_public_id(public_id, attributes, scope, updated_by:)
    end

    assign_attributes(champs_attributes:)
  end

  def repetition_row_ids(type_de_champ)
    return [] if !type_de_champ.repetition?

    stable_ids = revision.children_of(type_de_champ).map(&:stable_id)
    champs.filter { _1.stable_id.in?(stable_ids) && _1.row_id.present? }
      .map(&:row_id)
      .uniq
      .sort
  end

  def repetition_add_row(type_de_champ, updated_by:)
    raise "Can't add row to non-repetition type de champ" if !type_de_champ.repetition?

    row_id = ULID.generate
    types_de_champ = revision.children_of(type_de_champ)
    self.champs += types_de_champ.map { _1.build_champ(row_id:, updated_by:) }
    champs.reload if persisted?
    @champs_by_public_id = nil
    row_id
  end

  def repetition_remove_row(type_de_champ, row_id, updated_by:)
    raise "Can't remove row from non-repetition type de champ" if !type_de_champ.repetition?

    champs.where(row_id:).destroy_all
    champs.reload if persisted?
    @champs_by_public_id = nil
  end

  def reload
    super.tap do
      @champs_by_public_id = nil
    end
  end

  private

  def champs_by_public_id
    @champs_by_public_id ||= champs.sort_by(&:id).index_by(&:public_id)
  end

  def champ_for_export(type_de_champ, row_id)
    champ = champs_by_public_id[type_de_champ.public_id(row_id)]
    if champ.blank? || !champ.visible?
      nil
    else
      champ
    end
  end

  def champ_attributes_by_public_id(public_id, attributes, scope, updated_by:)
    stable_id, row_id = public_id.split('-')
    type_de_champ = find_type_de_champ_by_stable_id(stable_id, scope)
    champ_with_attributes_for_update(type_de_champ, row_id, updated_by:).last.merge(attributes)
  end

  def champ_with_attributes_for_update(type_de_champ, row_id, updated_by:)
    check_valid_row_id?(type_de_champ, row_id)
    attributes = type_de_champ.params_for_champ
    # TODO: Once we have the right index in place, we should change this to use `create_or_find_by` instead of `find_or_create_by`
    champ = champs
      .create_with(**attributes)
      .find_or_create_by!(stable_id: type_de_champ.stable_id, row_id:)

    attributes[:id] = champ.id
    attributes[:updated_by] = updated_by

    # Needed when a revision change the champ type in this case, we reset the champ data
    if champ.type != attributes[:type]
      attributes[:value] = nil
      attributes[:value_json] = nil
      attributes[:external_id] = nil
      attributes[:data] = nil
    end

    @champs_by_public_id = nil

    [champ, attributes]
  end

  def check_valid_row_id?(type_de_champ, row_id)
    if type_de_champ.child?(revision)
      if row_id.blank?
        raise "type_de_champ #{type_de_champ.stable_id} in revision #{revision_id} must have a row_id because it is part of a repetition"
      end
    elsif row_id.present? && type_de_champ.in_revision?(revision)
      raise "type_de_champ #{type_de_champ.stable_id} in revision #{revision_id} can not have a row_id because it is not part of a repetition"
    end
  end
end