# frozen_string_literal: true

module API
  class Notes < ::API::Base
    include PaginationParams
    helpers ::API::Helpers::NotesHelpers
    helpers Helpers::RateLimiter

    before { authenticate! }

    Helpers::NotesHelpers.feature_category_per_noteable_type.each do |noteable_type, feature_category|
      parent_type = noteable_type.parent_class.to_s.underscore
      noteables_str = noteable_type.to_s.underscore.pluralize

      params do
        requires :id, type: String, desc: "The ID of a #{parent_type}"
      end
      resource parent_type.pluralize.to_sym, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
        desc "Get a list of #{noteable_type.to_s.downcase} notes" do
          success Entities::Note
        end
        params do
          requires :noteable_id, type: Integer, desc: 'The ID of the noteable'
          optional :order_by, type: String, values: %w[created_at updated_at], default: 'created_at',
                              desc: 'Return notes ordered by `created_at` or `updated_at` fields.'
          optional :sort, type: String, values: %w[asc desc], default: 'desc',
                          desc: 'Return notes sorted in `asc` or `desc` order.'
          optional :activity_filter, type: String, values: UserPreference::NOTES_FILTERS.stringify_keys.keys, default: 'all_notes',
                           desc: 'The type of notables which are returned.'
          use :pagination
        end
        # rubocop: disable CodeReuse/ActiveRecord
        get ":id/#{noteables_str}/:noteable_id/notes", feature_category: feature_category do
          noteable = find_noteable(noteable_type, params[:noteable_id])

          # We exclude notes that are cross-references and that cannot be viewed
          # by the current user. By doing this exclusion at this level and not
          # at the DB query level (which we cannot in that case), the current
          # page can have less elements than :per_page even if
          # there's more than one page.
          notes_filter = UserPreference::NOTES_FILTERS[params[:activity_filter].to_sym]
          raw_notes = noteable.notes.with_metadata.with_notes_filter(notes_filter).reorder(order_options_with_tie_breaker)

          # paginate() only works with a relation. This could lead to a
          # mismatch between the pagination headers info and the actual notes
          # array returned, but this is really a edge-case.
          notes = paginate(raw_notes)
          notes = prepare_notes_for_rendering(notes)
          notes = notes.select { |note| note.readable_by?(current_user) }
          present notes, with: Entities::Note
        end
        # rubocop: enable CodeReuse/ActiveRecord

        desc "Get a single #{noteable_type.to_s.downcase} note" do
          success Entities::Note
        end
        params do
          requires :note_id, type: Integer, desc: 'The ID of a note'
          requires :noteable_id, type: Integer, desc: 'The ID of the noteable'
        end
        get ":id/#{noteables_str}/:noteable_id/notes/:note_id", feature_category: feature_category do
          noteable = find_noteable(noteable_type, params[:noteable_id])
          get_note(noteable, params[:note_id])
        end

        desc "Create a new #{noteable_type.to_s.downcase} note" do
          success Entities::Note
        end
        params do
          requires :noteable_id, type: Integer, desc: 'The ID of the noteable'
          requires :body, type: String, desc: 'The content of a note'
          optional :confidential, type: Boolean, desc: 'Confidentiality note flag, default is false'
          optional :created_at, type: String, desc: 'The creation date of the note'
        end
        post ":id/#{noteables_str}/:noteable_id/notes", feature_category: feature_category do
          allowlist =
            Gitlab::CurrentSettings.current_application_settings.notes_create_limit_allowlist
          check_rate_limit! :notes_create, [current_user], allowlist
          noteable = find_noteable(noteable_type, params[:noteable_id])

          opts = {
            note: params[:body],
            noteable_type: noteables_str.classify,
            noteable_id: noteable.id,
            confidential: params[:confidential],
            created_at: params[:created_at]
          }

          note = create_note(noteable, opts)

          if note.errors.keys == [:commands_only]
            status 202
            present note, with: Entities::NoteCommands
          elsif note.valid?
            present note, with: Entities.const_get(note.class.name, false)
          else
            note.errors.delete(:commands_only) if note.errors.has_key?(:commands)
            bad_request!("Note #{note.errors.messages}")
          end
        end

        desc "Update an existing #{noteable_type.to_s.downcase} note" do
          success Entities::Note
        end
        params do
          requires :noteable_id, type: Integer, desc: 'The ID of the noteable'
          requires :note_id, type: Integer, desc: 'The ID of a note'
          optional :body, type: String, allow_blank: false, desc: 'The content of a note'
          optional :confidential, type: Boolean, desc: 'Confidentiality note flag'
        end
        put ":id/#{noteables_str}/:noteable_id/notes/:note_id", feature_category: feature_category do
          noteable = find_noteable(noteable_type, params[:noteable_id])

          update_note(noteable, params[:note_id])
        end

        desc "Delete a #{noteable_type.to_s.downcase} note" do
          success Entities::Note
        end
        params do
          requires :noteable_id, type: Integer, desc: 'The ID of the noteable'
          requires :note_id, type: Integer, desc: 'The ID of a note'
        end
        delete ":id/#{noteables_str}/:noteable_id/notes/:note_id" do
          noteable = find_noteable(noteable_type, params[:noteable_id])

          delete_note(noteable, params[:note_id])
        end
      end
    end
  end
end
