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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.interceptor;

import org.activiti.engine.impl.cfg.TransactionPropagation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.transaction.*;
import java.lang.reflect.UndeclaredThrowableException;

/**

 */
public class JtaTransactionInterceptor extends AbstractCommandInterceptor {

  private static final Logger LOGGER = LoggerFactory.getLogger(JtaTransactionInterceptor.class);

  private final TransactionManager transactionManager;

  public JtaTransactionInterceptor(TransactionManager transactionManager) {
    this.transactionManager = transactionManager;
  }

  public  T execute(CommandConfig config, Command command) {
    LOGGER.debug("Running command with propagation {}", config.getTransactionPropagation());

    if (config.getTransactionPropagation() == TransactionPropagation.NOT_SUPPORTED) {
      return next.execute(config, command);
    }

    boolean requiresNew = config.getTransactionPropagation() == TransactionPropagation.REQUIRES_NEW;
    Transaction oldTx = null;
    try {
      boolean existing = isExisting();
      boolean isNew = !existing || requiresNew;
      if (existing && requiresNew) {
        oldTx = doSuspend();
      }
      if (isNew) {
        doBegin();
      }
      T result;
      try {
        result = next.execute(config, command);
      } catch (RuntimeException ex) {
        doRollback(isNew, ex);
        throw ex;
      } catch (Error err) {
        doRollback(isNew, err);
        throw err;
      } catch (Exception ex) {
        doRollback(isNew, ex);
        throw new UndeclaredThrowableException(ex, "TransactionCallback threw undeclared checked exception");
      }
      if (isNew) {
        doCommit();
      }
      return result;
    } finally {
      doResume(oldTx);
    }
  }

  private void doBegin() {
    try {
      transactionManager.begin();
    } catch (NotSupportedException e) {
      throw new TransactionException("Unable to begin transaction", e);
    } catch (SystemException e) {
      throw new TransactionException("Unable to begin transaction", e);
    }
  }

  private boolean isExisting() {
    try {
      return transactionManager.getStatus() != Status.STATUS_NO_TRANSACTION;
    } catch (SystemException e) {
      throw new TransactionException("Unable to retrieve transaction status", e);
    }
  }

  private Transaction doSuspend() {
    try {
      return transactionManager.suspend();
    } catch (SystemException e) {
      throw new TransactionException("Unable to suspend transaction", e);
    }
  }

  private void doResume(Transaction tx) {
    if (tx != null) {
      try {
        transactionManager.resume(tx);
      } catch (SystemException e) {
        throw new TransactionException("Unable to resume transaction", e);
      } catch (InvalidTransactionException e) {
        throw new TransactionException("Unable to resume transaction", e);
      }
    }
  }

  private void doCommit() {
    try {
      transactionManager.commit();
    } catch (HeuristicMixedException e) {
      throw new TransactionException("Unable to commit transaction", e);
    } catch (HeuristicRollbackException e) {
      throw new TransactionException("Unable to commit transaction", e);
    } catch (RollbackException e) {
      throw new TransactionException("Unable to commit transaction", e);
    } catch (SystemException e) {
      throw new TransactionException("Unable to commit transaction", e);
    } catch (RuntimeException e) {
      doRollback(true, e);
      throw e;
    } catch (Error e) {
      doRollback(true, e);
      throw e;
    }
  }

  private void doRollback(boolean isNew, Throwable originalException) {
    Throwable rollbackEx = null;
    try {
      if (isNew) {
        transactionManager.rollback();
      } else {
        transactionManager.setRollbackOnly();
      }
    } catch (SystemException e) {
      LOGGER.debug("Error when rolling back transaction", e);
    } catch (RuntimeException e) {
      rollbackEx = e;
      throw e;
    } catch (Error e) {
      rollbackEx = e;
      throw e;
    } finally {
      if (rollbackEx != null && originalException != null) {
        LOGGER.error("Error when rolling back transaction, original exception was:", originalException);
      }
    }
  }

  private static class TransactionException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    private TransactionException() {
    }

    private TransactionException(String s) {
      super(s);
    }

    private TransactionException(String s, Throwable throwable) {
      super(s, throwable);
    }

    private TransactionException(Throwable throwable) {
      super(throwable);
    }
  }
}