#-- encoding: UTF-8

#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2021 the OpenProject GmbH
#
# 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) 2006-2013 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 COPYRIGHT and LICENSE files for more details.
#++

module Queries
  module GroupBys
    class Base
      include ActiveModel::Validations

      def self.i18n_scope
        :activerecord
      end

      class_attribute :model
      attr_accessor :attribute

      def initialize(attribute)
        self.attribute = attribute
      end

      def self.key
        raise NotImplementedError
      end

      def association_class
        nil
      end

      def scope
        scope = model
        scope = model.joins(joins) if joins
        group_by scope
      end

      def name
        attribute
      end

      def joins
        nil
      end

      # Default to the same key for order
      # as the one for group
      def order_key
        self.class.key
      end

      protected

      def group_by(scope)
        scope.group(name)
      end
    end
  end
end