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

      before { authenticate! }

      helpers ::API::Helpers::MembersHelpers

      %w[group project].each do |source_type|
        params do
          requires :id, type: String, desc: "The #{source_type} ID"
        end
        resource source_type.pluralize, requirements: { id: %r{[^/]+} } do
          desc 'Gets a list of group or project members viewable by the authenticated user.' do
            success ::API::Entities::Member
          end
          params do
            optional :query, type: String, desc: 'A query string to search for members'
            use :pagination
          end
          get ":id/members" do
            source = find_source(source_type, params[:id])

            members = source.members.where.not(user_id: nil).includes(:user)
            members = members.joins(:user).merge(User.search(params[:query])) if params[:query].present?
            members = paginate(members)

            present members, with: ::API::Entities::Member
          end

          desc 'Gets a member of a group or project.' do
            success ::API::Entities::Member
          end
          params do
            requires :user_id, type: Integer, desc: 'The user ID of the member'
          end
          get ":id/members/:user_id" do
            source = find_source(source_type, params[:id])

            members = source.members
            member = members.find_by!(user_id: params[:user_id])

            present member, with: ::API::Entities::Member
          end

          desc 'Adds a member to a group or project.' do
            success ::API::Entities::Member
          end
          params do
            requires :user_id, type: Integer, desc: 'The user ID of the new member'
            requires :access_level, type: Integer, desc: 'A valid access level (defaults: `30`, developer access level)'
            optional :expires_at, type: DateTime, desc: 'Date string in the format YEAR-MONTH-DAY'
          end
          post ":id/members" do
            source = find_source(source_type, params[:id])
            authorize_admin_source!(source_type, source)

            member = source.members.find_by(user_id: params[:user_id])

            # We need this explicit check because `source.add_user` doesn't
            # currently return the member created so it would return 201 even if
            # the member already existed...
            # The `source_type == 'group'` check is to ensure back-compatibility
            # but 409 behavior should be used for both project and group members in 9.0!
            conflict!('Member already exists') if source_type == 'group' && member

            unless member
              member = source.add_user(params[:user_id], params[:access_level], current_user: current_user, expires_at: params[:expires_at])
            end

            if member.persisted? && member.valid?
              present member, with: ::API::Entities::Member
            else
              # This is to ensure back-compatibility but 400 behavior should be used
              # for all validation errors in 9.0!
              render_api_error!('Access level is not known', 422) if member.errors.key?(:access_level)
              render_validation_error!(member)
            end
          end

          desc 'Updates a member of a group or project.' do
            success ::API::Entities::Member
          end
          params do
            requires :user_id, type: Integer, desc: 'The user ID of the new member'
            requires :access_level, type: Integer, desc: 'A valid access level'
            optional :expires_at, type: DateTime, desc: 'Date string in the format YEAR-MONTH-DAY'
          end
          put ":id/members/:user_id" do
            source = find_source(source_type, params.delete(:id))
            authorize_admin_source!(source_type, source)

            member = source.members.find_by!(user_id: params.delete(:user_id))

            if member.update_attributes(declared_params(include_missing: false))
              present member, with: ::API::Entities::Member
            else
              # This is to ensure back-compatibility but 400 behavior should be used
              # for all validation errors in 9.0!
              render_api_error!('Access level is not known', 422) if member.errors.key?(:access_level)
              render_validation_error!(member)
            end
          end

          desc 'Removes a user from a group or project.'
          params do
            requires :user_id, type: Integer, desc: 'The user ID of the member'
          end
          delete ":id/members/:user_id" do
            source = find_source(source_type, params[:id])

            # This is to ensure back-compatibility but find_by! should be used
            # in that casse in 9.0!
            member = source.members.find_by(user_id: params[:user_id])

            # This is to ensure back-compatibility but this should be removed in
            # favor of find_by! in 9.0!
            not_found!("Member: user_id:#{params[:user_id]}") if source_type == 'group' && member.nil?

            # This is to ensure back-compatibility but 204 behavior should be used
            # for all DELETE endpoints in 9.0!
            if member.nil?
              status(200  )
              { message: "Access revoked", id: params[:user_id].to_i }
            else
              ::Members::DestroyService.new(current_user).execute(member)

              present member, with: ::API::Entities::Member
            end
          end
        end
      end
    end
  end
end