#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2017 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2017 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# See doc/COPYRIGHT.rdoc for more details.
#++

require 'securerandom'
require 'api/v3/queries/query_representer'

module API
  module V3
    module Queries
      class QueriesAPI < ::API::OpenProjectAPI
        resources :queries do
          mount API::V3::Queries::Columns::QueryColumnsAPI
          mount API::V3::Queries::GroupBys::QueryGroupBysAPI
          mount API::V3::Queries::SortBys::QuerySortBysAPI
          mount API::V3::Queries::Filters::QueryFiltersAPI
          mount API::V3::Queries::Operators::QueryOperatorsAPI

          get do
            authorize_any [:view_work_packages, :manage_public_queries], global: true

            query_query = ::API::V3::ParamsToQueryService.new(Query, current_user).call(params)

            if query_query.valid?
              queries = query_query
                        .results

              self_link = api_v3_paths.queries
              ::API::V3::Queries::QueryCollectionRepresenter.new(queries,
                                                                 self_link,
                                                                 current_user: current_user)
            else
              raise ::API::Errors::InvalidQuery.new(query_query.errors.full_messages)
            end
          end

          params do
            requires :id, desc: 'Query id'
          end
          route_param :id do
            before do
              @query = Query.find(params[:id])

              results_representer = ::API::V3::WorkPackageCollectionFromQueryService
                                    .new(@query, current_user)
                                    .call(params)

              @representer = QueryRepresenter.new(@query,
                                                  current_user: current_user,
                                                  results: results_representer.result,
                                                  params: params)
              authorize_by_policy(:show) do
                raise API::Errors::NotFound
              end
            end

            helpers do
              def authorize_by_policy(action, &block)
                authorize_by_with_raise(-> () { allowed_to?(action) }, &block)
              end

              def allowed_to?(action)
                QueryPolicy.new(current_user).allowed?(@query, action)
              end
            end

            get do
              @representer
            end

            delete do
              authorize_by_policy(:destroy)

              @query.destroy

              status 204
            end

            patch :star do
              authorize_by_policy(:star)

              # Query name is not user-visible, but apparently used as CSS class. WTF.
              # Normalizing the query name can result in conflicts and empty names in case all
              # characters are filtered out. A random name doesn't have these problems.
              query_menu_item = MenuItems::QueryMenuItem
                                .find_or_initialize_by(navigatable_id: @query.id) do |item|
                item.name  = SecureRandom.uuid
                item.title = @query.name
              end
              query_menu_item.save!
              @representer
            end

            patch :unstar do
              authorize_by_policy(:unstar)

              query_menu_item = @query.query_menu_item
              return @representer if @query.query_menu_item.nil?
              query_menu_item.destroy
              @query.reload
              @representer
            end
          end
        end
      end
    end
  end
end