module API
  module V3
    class Groups < Grape::API
      include PaginationParams

      before { authenticate! }

      helpers do
        params :optional_params do
          optional :description, type: String, desc: 'The description of the group'
          optional :visibility_level, type: Integer, desc: 'The visibility level of the group'
          optional :lfs_enabled, type: Boolean, desc: 'Enable/disable LFS for the projects in this group'
          optional :request_access_enabled, type: Boolean, desc: 'Allow users to request member access'
        end

        params :statistics_params do
          optional :statistics, type: Boolean, default: false, desc: 'Include project statistics'
        end

        def present_groups(groups, options = {})
          options = options.reverse_merge(
            with: Entities::Group,
            current_user: current_user
          )

          groups = groups.with_statistics if options[:statistics]
          present paginate(groups), options
        end
      end

      resource :groups do
        desc 'Get a groups list' do
          success Entities::Group
        end
        params do
          use :statistics_params
          optional :skip_groups, type: Array[Integer], desc: 'Array of group ids to exclude from list'
          optional :all_available, type: Boolean, desc: 'Show all group that you have access to'
          optional :search, type: String, desc: 'Search for a specific group'
          optional :order_by, type: String, values: %w[name path], default: 'name', desc: 'Order by name or path'
          optional :sort, type: String, values: %w[asc desc], default: 'asc', desc: 'Sort by asc (ascending) or desc (descending)'
          use :pagination
        end
        get do
          groups = if current_user.admin
                     Group.all
                   elsif params[:all_available]
                     GroupsFinder.new(current_user).execute
                   else
                     current_user.groups
                   end

          groups = groups.search(params[:search]) if params[:search].present?
          groups = groups.where.not(id: params[:skip_groups]) if params[:skip_groups].present?
          groups = groups.reorder(params[:order_by] => params[:sort])

          present_groups groups, statistics: params[:statistics] && current_user.admin?
        end

        desc 'Get list of owned groups for authenticated user' do
          success Entities::Group
        end
        params do
          use :pagination
          use :statistics_params
        end
        get '/owned' do
          present_groups current_user.owned_groups, statistics: params[:statistics]
        end

        desc 'Create a group. Available only for users who can create groups.' do
          success Entities::Group
        end
        params do
          requires :name, type: String, desc: 'The name of the group'
          requires :path, type: String, desc: 'The path of the group'

          if ::Group.supports_nested_groups?
            optional :parent_id, type: Integer, desc: 'The parent group id for creating nested group'
          end

          use :optional_params
        end
        post do
          authorize! :create_group

          group = ::Groups::CreateService.new(current_user, declared_params(include_missing: false)).execute

          if group.persisted?
            present group, with: Entities::Group, current_user: current_user
          else
            render_api_error!("Failed to save group #{group.errors.messages}", 400)
          end
        end
      end

      params do
        requires :id, type: String, desc: 'The ID of a group'
      end
      resource :groups, requirements: { id: %r{[^/]+} } do
        desc 'Update a group. Available only for users who can administrate groups.' do
          success Entities::Group
        end
        params do
          optional :name, type: String, desc: 'The name of the group'
          optional :path, type: String, desc: 'The path of the group'
          use :optional_params
          at_least_one_of :name, :path, :description, :visibility_level,
                          :lfs_enabled, :request_access_enabled
        end
        put ':id' do
          group = find_group!(params[:id])
          authorize! :admin_group, group

          if ::Groups::UpdateService.new(group, current_user, declared_params(include_missing: false)).execute
            present group, with: Entities::GroupDetail, current_user: current_user
          else
            render_validation_error!(group)
          end
        end

        desc 'Get a single group, with containing projects.' do
          success Entities::GroupDetail
        end
        get ":id" do
          group = find_group!(params[:id])
          present group, with: Entities::GroupDetail, current_user: current_user
        end

        desc 'Remove a group.'
        delete ":id" do
          group = find_group!(params[:id])
          authorize! :admin_group, group
          present ::Groups::DestroyService.new(group, current_user).execute, with: Entities::GroupDetail, current_user: current_user
        end

        desc 'Get a list of projects in this group.' do
          success Entities::Project
        end
        params do
          optional :archived, type: Boolean, default: false, desc: 'Limit by archived status'
          optional :visibility, type: String, values: %w[public internal private],
                                desc: 'Limit by visibility'
          optional :search, type: String, desc: 'Return list of authorized projects matching the search criteria'
          optional :order_by, type: String, values: %w[id name path created_at updated_at last_activity_at],
                              default: 'created_at', desc: 'Return projects ordered by field'
          optional :sort, type: String, values: %w[asc desc], default: 'desc',
                          desc: 'Return projects sorted in ascending and descending order'
          optional :simple, type: Boolean, default: false,
                            desc: 'Return only the ID, URL, name, and path of each project'
          optional :owned, type: Boolean, default: false, desc: 'Limit by owned by authenticated user'
          optional :starred, type: Boolean, default: false, desc: 'Limit by starred status'

          use :pagination
        end
        get ":id/projects" do
          group = find_group!(params[:id])
          projects = GroupProjectsFinder.new(group: group, current_user: current_user).execute
          projects = filter_projects(projects)
          entity = params[:simple] ? ::API::Entities::BasicProjectDetails : Entities::Project
          present paginate(projects), with: entity, current_user: current_user
        end

        desc 'Transfer a project to the group namespace. Available only for admin.' do
          success Entities::GroupDetail
        end
        params do
          requires :project_id, type: String, desc: 'The ID or path of the project'
        end
        post ":id/projects/:project_id", requirements: { project_id: /.+/ } do
          authenticated_as_admin!
          group = find_group!(params[:id])
          project = find_project!(params[:project_id])
          result = ::Projects::TransferService.new(project, current_user).execute(group)

          if result
            present group, with: Entities::GroupDetail, current_user: current_user
          else
            render_api_error!("Failed to transfer project #{project.errors.messages}", 400)
          end
        end
      end
    end
  end
end
