module API
  module V3
    # MergeRequestDiff API
    class MergeRequestDiffs < Grape::API
      before { authenticate! }

      params do
        requires :id, type: String, desc: 'The ID of a project'
      end
      resource :projects, requirements: { id: %r{[^/]+} } do
        desc 'Get a list of merge request diff versions' do
          detail 'This feature was introduced in GitLab 8.12.'
          success ::API::Entities::MergeRequestDiff
        end

        params do
          requires :merge_request_id, type: Integer, desc: 'The ID of a merge request'
        end

        get ":id/merge_requests/:merge_request_id/versions" do
          merge_request = find_merge_request_with_access(params[:merge_request_id])

          present merge_request.merge_request_diffs, with: ::API::Entities::MergeRequestDiff
        end

        desc 'Get a single merge request diff version' do
          detail 'This feature was introduced in GitLab 8.12.'
          success ::API::Entities::MergeRequestDiffFull
        end

        params do
          requires :merge_request_id, type: Integer, desc: 'The ID of a merge request'
          requires :version_id, type: Integer, desc: 'The ID of a merge request diff version'
        end

        get ":id/merge_requests/:merge_request_id/versions/:version_id" do
          merge_request = find_merge_request_with_access(params[:merge_request_id])

          present merge_request.merge_request_diffs.find(params[:version_id]), with: ::API::Entities::MergeRequestDiffFull
        end
      end
    end
  end
end