# frozen_string_literal: true

module API
  class Search < Grape::API
    include PaginationParams

    before { authenticate! }

    helpers do
      SCOPE_ENTITY = {
        merge_requests: Entities::MergeRequestBasic,
        issues: Entities::IssueBasic,
        projects: Entities::BasicProjectDetails,
        milestones: Entities::Milestone,
        notes: Entities::Note,
        commits: Entities::CommitDetail,
        blobs: Entities::Blob,
        wiki_blobs: Entities::Blob,
        snippet_titles: Entities::Snippet,
        snippet_blobs: Entities::Snippet,
        users: Entities::UserBasic
      }.freeze

      def search(additional_params = {})
        search_params = {
          scope: params[:scope],
          search: params[:search],
          snippets: snippets?,
          page: params[:page],
          per_page: params[:per_page]
        }.merge(additional_params)

        results = SearchService.new(current_user, search_params).search_objects

        process_results(results)
      end

      def process_results(results)
        paginate(results)
      end

      def snippets?
        %w(snippet_blobs snippet_titles).include?(params[:scope]).to_s
      end

      def entity
        SCOPE_ENTITY[params[:scope].to_sym]
      end

      def verify_search_scope!
        # In EE we have additional validation requirements for searches.
        # Defining this method here as a noop allows us to easily extend it in
        # EE, without having to modify this file directly.
      end

      def check_users_search_allowed!
        if params[:scope].to_sym == :users && Feature.disabled?(:users_search, default_enabled: true)
          render_api_error!({ error: _("Scope not supported with disabled 'users_search' feature!") }, 400)
        end
      end
    end

    resource :search do
      desc 'Search on GitLab' do
        detail 'This feature was introduced in GitLab 10.5.'
      end
      params do
        requires :search, type: String, desc: 'The expression it should be searched for'
        requires :scope,
          type: String,
          desc: 'The scope of the search',
          values: Helpers::SearchHelpers.global_search_scopes
        use :pagination
      end
      get do
        verify_search_scope!
        check_users_search_allowed!

        present search, with: entity
      end
    end

    resource :groups, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
      desc 'Search on GitLab' do
        detail 'This feature was introduced in GitLab 10.5.'
      end
      params do
        requires :id, type: String, desc: 'The ID of a group'
        requires :search, type: String, desc: 'The expression it should be searched for'
        requires :scope,
          type: String,
          desc: 'The scope of the search',
          values: Helpers::SearchHelpers.group_search_scopes
        use :pagination
      end
      get ':id/(-/)search' do
        verify_search_scope!
        check_users_search_allowed!

        present search(group_id: user_group.id), with: entity
      end
    end

    resource :projects, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
      desc 'Search on GitLab' do
        detail 'This feature was introduced in GitLab 10.5.'
      end
      params do
        requires :id, type: String, desc: 'The ID of a project'
        requires :search, type: String, desc: 'The expression it should be searched for'
        requires :scope,
          type: String,
          desc: 'The scope of the search',
          values: Helpers::SearchHelpers.project_search_scopes
        optional :ref, type: String, desc: 'The name of a repository branch or tag. If not given, the default branch is used'
        use :pagination
      end
      get ':id/(-/)search' do
        check_users_search_allowed!

        present search({ project_id: user_project.id, repository_ref: params[:ref] }), with: entity
      end
    end
  end
end
