module Wiki
  class CompatibilityWriter
    def self.create! tag_name:, body:, created_by_user:, message: nil
      Commit.create_legacy_content!(
          tag_name:, body:, created_by_user:, message:)
    end

    def self.update! page:, body:, updated_by_user:, message: nil,
                     base_revision_id: nil
      normalised = Commit.normalise_body(body)
      if normalised.blank?
        return Commit.legacy_content!(
            page:, body: normalised, created_user: updated_by_user, message:,
            base_revision_id:)
      end

      if base_revision_id.present?
        current_id = page.wiki_revisions.maximum(:id)
        if current_id && current_id != base_revision_id.to_i
          raise Commit::Conflict,
              "競合が発生してゐます" +
              "（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
        end
      end

      return if Commit.normalise_body(page.body) == normalised

      Commit.legacy_content!(
          page:, body: normalised, created_user: updated_by_user, message:,
          base_revision_id:)
    end
  end
end