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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 java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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;

/**


 */
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());

      setProjectReleaseVersion(deployment);
      deployment.setVersion(1);

      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) {
              if (!deploymentsDiffer(deployment,
                                     existingDeployment)) {
                  return existingDeployment;
              } else {
                  deployment.setVersion(existingDeployment.getVersion() + 1);
              }
          }
    }

    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;
  }

    private void setProjectReleaseVersion(DeploymentEntity deployment) {
        if (deploymentBuilder.hasProjectManifestSet()) {
            deployment.setProjectReleaseVersion(deploymentBuilder.getProjectManifest().getVersion());
        }
    }

    protected boolean deploymentsDiffer(DeploymentEntity deployment,
                                        DeploymentEntity saved) {

        if (deploymentBuilder.hasProjectManifestSet()) {

            return !deployment.getProjectReleaseVersion().equals(saved.getProjectReleaseVersion());
        } else {

            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);
    }
  }
  
}