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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.test;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.impl.ProcessEngineImpl;
import org.activiti.engine.impl.cfg.CommandExecutorImpl;
import org.activiti.engine.impl.interceptor.CommandExecutor;
import org.activiti.engine.impl.interceptor.CommandInterceptor;
import org.activiti.engine.impl.interceptor.CommandInvoker;
import org.activiti.engine.impl.interceptor.DebugCommandInvoker;
import org.activiti.engine.test.EnableVerboseExecutionTreeLogging;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Base class for the activiti test cases.
 * 
 * The main reason not to use our own test support classes is that we need to run our test suite with various configurations, e.g. with and without spring, standalone or on a server etc. Those
 * requirements create some complications so we think it's best to use a separate base class. That way it is much easier for us to maintain our own codebase and at the same time provide stability on
 * the test support classes that we offer as part of our api (in org.activiti.engine.test).
 * 


 */
public abstract class PluggableActivitiTestCase extends AbstractActivitiTestCase {

  private static Logger pluggableActivitiTestCaseLogger = LoggerFactory.getLogger(PluggableActivitiTestCase.class);

  protected static ProcessEngine cachedProcessEngine;
  
  protected void initializeProcessEngine() {
    if (cachedProcessEngine == null) {

      pluggableActivitiTestCaseLogger.info("No cached process engine found for test. Retrieving the default engine.");
      ProcessEngines.destroy(); // Just to be sure we're not getting any previously cached version

      cachedProcessEngine = ProcessEngines.getDefaultProcessEngine();
      if (cachedProcessEngine == null) {
        throw new ActivitiException("no default process engine available");
      }
    }
    
    processEngine = cachedProcessEngine;
    processEngineConfiguration = ((ProcessEngineImpl) processEngine).getProcessEngineConfiguration();
    
    // Enable verbose execution tree debugging if needed
    if (this.getClass().isAnnotationPresent(EnableVerboseExecutionTreeLogging.class)) {
      swapCommandInvoker(true);
    }
    
  }
  
  @Override
  protected void closeDownProcessEngine() {
    super.closeDownProcessEngine();
    
    // Reset command invoker
    if (this.getClass().isAnnotationPresent(EnableVerboseExecutionTreeLogging.class)) {
      swapCommandInvoker(false);
    }
  }
  
  protected void swapCommandInvoker(boolean debug) {
    CommandExecutor commandExecutor = processEngineConfiguration.getCommandExecutor();
    if (commandExecutor instanceof CommandExecutorImpl) {
      CommandExecutorImpl commandExecutorImpl = (CommandExecutorImpl) commandExecutor;
      
      CommandInterceptor previousCommandInterceptor = null; 
      CommandInterceptor commandInterceptor = commandExecutorImpl.getFirst();
      
      while (commandInterceptor != null) {
        
        boolean matches = debug ? (commandInterceptor instanceof CommandInvoker) : (commandInterceptor instanceof DebugCommandInvoker);
        if (matches) {
          
          CommandInterceptor commandInvoker = debug ? new DebugCommandInvoker() : new CommandInvoker();
          if (previousCommandInterceptor != null) {
            previousCommandInterceptor.setNext(commandInvoker);
          } else {
            commandExecutorImpl.setFirst(previousCommandInterceptor);
          }
          break;
          
        } else {
          previousCommandInterceptor = commandInterceptor;
          commandInterceptor = commandInterceptor.getNext();
        }
      }
      
    } else {
      pluggableActivitiTestCaseLogger.warn("Not using " + CommandExecutorImpl.class + ", ignoring the " 
          + EnableVerboseExecutionTreeLogging.class + " annotation");
    }
  }
  
}