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# This file is a part of redmine_tags

# redMine plugin, that adds tagging support.

#

# Copyright (c) 2010 Aleksey V Zapparov AKA ixti

#

# redmine_tags 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 3 of the License, or

# (at your option) any later version.

#

# redmine_tags 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 redmine_tags.  If not, see <http://www.gnu.org/licenses/>.

require_dependency 'query'

module RedmineTags

  module Patches

    module QueryPatch

      def self.included(base)

        base.send(:include, InstanceMethods)

        base.class_eval do

          unloadable

          alias_method :statement_original, :statement

          alias_method :statement, :statement_extended

          alias_method :available_filters_original, :available_filters

          alias_method :available_filters, :available_filters_extended

          base.add_available_column(QueryColumn.new(:tags))

        end

      end

      module InstanceMethods

        def statement_extended

          filter  = filters.delete 'tags'

          clauses = statement_original

          if filter

            filters.merge!( 'tags' => filter )

            values    = values_for('tags').clone

            compare   = operator_for('tags').eql?('=') ? 'IN' : 'NOT IN'

            ids_list  = Issue.tagged_with(values).collect{ |issue| issue.id }.push(0).join(',')

            clauses << " AND ( #{Issue.table_name}.id #{compare} (#{ids_list}) ) "

          end

          clauses

        end

        def available_filters_extended

          unless @available_filters

            available_filters_original.merge!({ 'tags' => {

              :type   => :list,

              :order  => 6,

              :values => Issue.available_tags(:project => project).collect{ |t| [t.name, t.name] }

            }})

          end

          @available_filters

        end

      end

    end

  end

end