/**
 *
 * Copyright
 * 2009-2015 Jayway Products AB
 * 2016-2017 Föreningen Sambruk
 *
 * Licensed under AGPL, Version 3.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.gnu.org/licenses/agpl.txt
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package se.streamsource.streamflow.web.domain.entity.project;

import java.util.ArrayList;
import java.util.List;

import org.qi4j.api.injection.scope.This;
import org.qi4j.api.mixin.Mixins;

import se.streamsource.streamflow.web.domain.interaction.gtd.Assignee;
import se.streamsource.streamflow.web.domain.structure.group.Group;
import se.streamsource.streamflow.web.domain.structure.group.Participant;
import se.streamsource.streamflow.web.domain.structure.group.Participants;
import se.streamsource.streamflow.web.domain.structure.project.Member;
import se.streamsource.streamflow.web.domain.structure.project.Members;
import se.streamsource.streamflow.web.domain.structure.project.Project;

@Mixins(ProjectMembersQueries.Mixin.class)
public interface ProjectMembersQueries
{
   List<Assignee> possibleAssignees( );

   class Mixin
         implements ProjectMembersQueries
   {
      @This
      Project project;


      public List<Assignee> possibleAssignees()
      {
         return resolveProjectMembers( ((Members.Data)project).members().toList() );
      }

      private List<Assignee> resolveProjectMembers(List<Member> members)
      {
         List<Assignee> assignees = new ArrayList<Assignee>();
         for (Member member : members)
         {
            if (member instanceof Group){
               assignees.addAll( resolveGroupMembers( ((Participants.Data) member).participants().toList()) );
            } else {
               assignees.add((Assignee) member);
            }
         }
         return assignees;
      }
      
      private List<Assignee> resolveGroupMembers(List<Participant> participants)
      {
         List<Assignee> assignees = new ArrayList<Assignee>();
         for (Participant participant : participants)
         {
            if (participant instanceof Participants) {
               assignees.addAll(resolveGroupMembers( ((Participants.Data ) participant).participants().toList()));
            }
            assignees.add( (Assignee) participant );
         }
         return assignees;
      }
   }
}