/**
 *
 * 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.context.workspace.cases.general;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import se.streamsource.dci.api.InteractionConstraint;
import se.streamsource.dci.api.InteractionConstraintDeclaration;
import se.streamsource.dci.api.RoleMap;
import se.streamsource.streamflow.web.domain.structure.form.Form;
import se.streamsource.streamflow.web.domain.structure.form.FormDraft;
import se.streamsource.streamflow.web.domain.structure.form.FormDrafts;

/**
 * Check if current form has a draft already
 */
@InteractionConstraintDeclaration(HasFormDraft.HasFormDraftConstraint.class)
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
public @interface HasFormDraft
{
   boolean value() default true; // True -> Form draft should exist

   class HasFormDraftConstraint
         implements InteractionConstraint<HasFormDraft>
   {
      public boolean isValid( HasFormDraft hasFormDraft, RoleMap roleMap )
      {
         
         Form form = RoleMap.role( Form.class );

         FormDrafts formDrafts = RoleMap.role( FormDrafts.class );

         FormDraft formDraft = formDrafts.getFormDraft( form );
         
         if (hasFormDraft.value())
         {
            return formDraft != null;
         } else
         {
            return formDraft == null;
         }
      }
   }
}