#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2018 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 docs/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
          mount API::V3::Queries::Schemas::QuerySchemaAPI
          mount API::V3::Queries::Schemas::QueryFilterInstanceSchemaAPI
          mount API::V3::Queries::CreateFormAPI

          helpers ::API::V3::Queries::Helpers::QueryRepresenterResponse
          helpers ::API::V3::Queries::QueryHelper

          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
            authorize_any %i(view_work_packages manage_public_queries), global: true

            queries_scope = Query.all.includes(QueryRepresenter.to_eager_load)

            ::API::V3::Utilities::ParamsToQuery.collection_response(queries_scope,
                                                                    current_user,
                                                                    params)
          end

          namespace 'available_projects' do
            before do
              authorize(:view_work_packages, global: true, user: current_user)
            end

            get do
              available_projects = Project.allowed_to(current_user, :view_work_packages)
              self_link = api_v3_paths.query_available_projects

              ::API::V3::Projects::ProjectCollectionRepresenter.new(available_projects,
                                                                    self_link,
                                                                    current_user: current_user)
            end
          end

          namespace 'default' do
            get do
              @query = Query.new_default(name: 'default',
                                         user: current_user)

              authorize_by_policy(:show)

              query_representer_response(@query, params)
            end
          end

          post do
            create_query request_body, current_user
          end

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

              authorize_by_policy(:show) do
                raise API::Errors::NotFound
              end
            end

            mount API::V3::Queries::UpdateFormAPI

            patch do
              update_query @query, request_body, current_user
            end

            get do
              # We try to ignore invalid aspects of the query as the user
              # might not even be able to fix them (public  query)
              # and because they might only be invalid in his context
              # but not for somebody having more permissions, e.g. subproject
              # filter for admin vs for anonymous.
              # Permissions are enforced nevertheless.
              @query.valid_subset!

              # We do not ignore invalid params provided by the client.
              query_representer_response(@query, params)
            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!

              @query.valid_subset!
              query_representer_response(@query, {})
            end

            patch :unstar do
              authorize_by_policy(:unstar)

              @query.valid_subset!
              representer = query_representer_response(@query, {})

              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
