/* 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.impl.cmd;

import java.io.Serializable;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.TaskEntity;
import org.activiti.engine.task.Task;
import org.flowable.common.engine.api.delegate.event.FlowableEngineEventType;
import org.flowable.common.engine.impl.interceptor.EngineConfigurationConstants;

/**
 * @author Joram Barrez
 */
public class SaveTaskCmd implements Command<Void>, Serializable {

    private static final long serialVersionUID = 1L;

    protected TaskEntity task;

    public SaveTaskCmd(Task task) {
        this.task = (TaskEntity) task;
    }

    @Override
    public Void execute(CommandContext commandContext) {
        if (task == null) {
            throw new ActivitiIllegalArgumentException("task is null");
        }

        if (task.getRevision() == 0) {
            task.insert(null, true);

            // Need to to be done here, we can't make it generic for standalone tasks
            // and tasks from a process, as the order of setting properties is
            // completely different.
            if (Context.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {
                Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(
                        ActivitiEventBuilder.createEntityEvent(FlowableEngineEventType.TASK_CREATED, task),
                        EngineConfigurationConstants.KEY_PROCESS_ENGINE_CONFIG);

                if (task.getAssignee() != null) {
                    // The assignment event is normally fired when calling setAssignee. However, this
                    // doesn't work for standalone tasks as the commandcontext is not available.
                    Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(
                            ActivitiEventBuilder.createEntityEvent(FlowableEngineEventType.TASK_ASSIGNED, task),
                            EngineConfigurationConstants.KEY_PROCESS_ENGINE_CONFIG);
                }
            }
        } else {
            task.update();
        }

        return null;
    }

}
