/* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * 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 org.activiti.engine.test.pvm.activities;

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

import org.activiti.engine.impl.pvm.PvmActivity;
import org.activiti.engine.impl.pvm.PvmTransition;
import org.activiti.engine.impl.pvm.delegate.ActivityExecution;
import org.activiti.engine.impl.pvm.delegate.CompositeActivityBehavior;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.impl.pvm.runtime.InterpretableExecution;
import org.flowable.engine.delegate.DelegateExecution;

/**
 * @author Daniel Meyer
 */
public class EventScopeCreatingSubprocess implements CompositeActivityBehavior {

    public void execute(DelegateExecution execution) {
        ActivityExecution activityExecution = (ActivityExecution) execution;
        List<PvmActivity> startActivities = new ArrayList<PvmActivity>();
        for (PvmActivity activity : activityExecution.getActivity().getActivities()) {
            if (activity.getIncomingTransitions().isEmpty()) {
                startActivities.add(activity);
            }
        }

        for (PvmActivity startActivity : startActivities) {
            activityExecution.executeActivity(startActivity);
        }
    }

    /*
     * Incoming execution is transformed into an event scope, new, non-concurrent execution leaves activity
     */
    @SuppressWarnings("unchecked")
    public void lastExecutionEnded(ActivityExecution execution) {

        ActivityExecution outgoingExecution = execution.getParent().createExecution();
        outgoingExecution.setConcurrent(false);
        ((InterpretableExecution) outgoingExecution).setActivity((ActivityImpl) execution.getActivity());

        // eventscope execution
        execution.setConcurrent(false);
        execution.setActive(false);
        ((InterpretableExecution) execution).setEventScope(true);

        List<PvmTransition> outgoingTransitions = execution.getActivity().getOutgoingTransitions();
        if (outgoingTransitions.isEmpty()) {
            outgoingExecution.end();
        } else {
            outgoingExecution.takeAll(outgoingTransitions, Collections.EMPTY_LIST);
        }
    }

    // used by timers
    @SuppressWarnings("unchecked")
    public void timerFires(ActivityExecution execution, String signalName, Object signalData) throws Exception {
        PvmActivity timerActivity = execution.getActivity();
        boolean isInterrupting = (Boolean) timerActivity.getProperty("isInterrupting");
        List<ActivityExecution> recyclableExecutions;
        if (isInterrupting) {
            recyclableExecutions = removeAllExecutions(execution);
        } else {
            recyclableExecutions = Collections.EMPTY_LIST;
        }
        execution.takeAll(timerActivity.getOutgoingTransitions(), recyclableExecutions);
    }

    private List<ActivityExecution> removeAllExecutions(ActivityExecution execution) {
        return null;
    }

}
