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/* 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 org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.DeploymentEntity;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.engine.impl.persistence.entity.ResourceEntity;
import org.activiti.engine.impl.repository.DeploymentBuilderImpl;
import org.activiti.engine.repository.Deployment;

import java.io.Serializable;
import java.util.*;

/**


 */
public class DeployCmd implements Command, Serializable {

  private static final long serialVersionUID = 1L;
  protected DeploymentBuilderImpl deploymentBuilder;

  public DeployCmd(DeploymentBuilderImpl deploymentBuilder) {
    this.deploymentBuilder = deploymentBuilder;
  }

  public Deployment execute(CommandContext commandContext) {
    return executeDeploy(commandContext);
  }

  protected Deployment executeDeploy(CommandContext commandContext) {
    DeploymentEntity deployment = deploymentBuilder.getDeployment();

    deployment.setDeploymentTime(commandContext.getProcessEngineConfiguration().getClock().getCurrentTime());

    if (deploymentBuilder.isDuplicateFilterEnabled()) {

      List existingDeployments = new ArrayList();
      if (deployment.getTenantId() == null || ProcessEngineConfiguration.NO_TENANT_ID.equals(deployment.getTenantId())) {
        DeploymentEntity existingDeployment = commandContext.getDeploymentEntityManager().findLatestDeploymentByName(deployment.getName());
        if (existingDeployment != null) {
          existingDeployments.add(existingDeployment);
        }
      } else {
        List deploymentList = commandContext.getProcessEngineConfiguration().getRepositoryService().createDeploymentQuery().deploymentName(deployment.getName())
            .deploymentTenantId(deployment.getTenantId()).orderByDeploymentId().desc().list();

        if (!deploymentList.isEmpty()) {
          existingDeployments.addAll(deploymentList);
        }
      }

      DeploymentEntity existingDeployment = null;
      if (!existingDeployments.isEmpty()) {
        existingDeployment = (DeploymentEntity) existingDeployments.get(0);
      }

      if ((existingDeployment != null) && !deploymentsDiffer(deployment, existingDeployment)) {
        return existingDeployment;
      }
    }

    deployment.setNew(true);

    // Save the data
    commandContext.getDeploymentEntityManager().insert(deployment);

    if (commandContext.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {
      commandContext.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_CREATED, deployment));
    }

    // Deployment settings
    Map deploymentSettings = new HashMap();
    deploymentSettings.put(DeploymentSettings.IS_BPMN20_XSD_VALIDATION_ENABLED, deploymentBuilder.isBpmn20XsdValidationEnabled());
    deploymentSettings.put(DeploymentSettings.IS_PROCESS_VALIDATION_ENABLED, deploymentBuilder.isProcessValidationEnabled());

    // Actually deploy
    commandContext.getProcessEngineConfiguration().getDeploymentManager().deploy(deployment, deploymentSettings);

    if (deploymentBuilder.getProcessDefinitionsActivationDate() != null) {
      scheduleProcessDefinitionActivation(commandContext, deployment);
    }

    if (commandContext.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {
      commandContext.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_INITIALIZED, deployment));
    }

    return deployment;
  }

  protected boolean deploymentsDiffer(DeploymentEntity deployment, DeploymentEntity saved) {

    if (deployment.getResources() == null || saved.getResources() == null) {
      return true;
    }

    Map resources = deployment.getResources();
    Map savedResources = saved.getResources();

    for (String resourceName : resources.keySet()) {
      ResourceEntity savedResource = savedResources.get(resourceName);

      if (savedResource == null)
        return true;

      if (!savedResource.isGenerated()) {
        ResourceEntity resource = resources.get(resourceName);

        byte[] bytes = resource.getBytes();
        byte[] savedBytes = savedResource.getBytes();
        if (!Arrays.equals(bytes, savedBytes)) {
          return true;
        }
      }
    }
    return false;
  }

  protected void scheduleProcessDefinitionActivation(CommandContext commandContext, DeploymentEntity deployment) {
    for (ProcessDefinitionEntity processDefinitionEntity : deployment.getDeployedArtifacts(ProcessDefinitionEntity.class)) {

      // If activation date is set, we first suspend all the process
      // definition
      SuspendProcessDefinitionCmd suspendProcessDefinitionCmd = new SuspendProcessDefinitionCmd(processDefinitionEntity, false, null, deployment.getTenantId());
      suspendProcessDefinitionCmd.execute(commandContext);

      // And we schedule an activation at the provided date
      ActivateProcessDefinitionCmd activateProcessDefinitionCmd = new ActivateProcessDefinitionCmd(processDefinitionEntity, false, deploymentBuilder.getProcessDefinitionsActivationDate(),
          deployment.getTenantId());
      activateProcessDefinitionCmd.execute(commandContext);
    }
  }
  
}