/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.core.execution;

import org.mule.runtime.core.exception.MessagingException;
import org.mule.runtime.core.api.Event;
import org.mule.runtime.core.api.construct.FlowConstruct;
import org.mule.runtime.core.api.exception.MessagingExceptionHandler;
import org.mule.runtime.core.api.execution.ExecutionCallback;

class HandleExceptionInterceptor implements ExecutionInterceptor<Event> {

  private final ExecutionInterceptor<Event> next;
  private final MessagingExceptionHandler messagingExceptionHandler;
  private final FlowConstruct flow;

  public HandleExceptionInterceptor(ExecutionInterceptor<Event> next, MessagingExceptionHandler messagingExceptionHandler,
                                    FlowConstruct flow) {
    this.next = next;
    this.messagingExceptionHandler = messagingExceptionHandler;
    this.flow = flow;
  }

  @Override
  public Event execute(ExecutionCallback<Event> callback, ExecutionContext executionContext) throws Exception {
    try {
      return next.execute(callback, executionContext);
    } catch (MessagingException e) {
      Event result;
      try {
        if (messagingExceptionHandler != null) {
          result = messagingExceptionHandler.handleException(e, e.getEvent());
        } else {
          result = flow.getExceptionListener().handleException(e, e.getEvent());
        }
        e.setProcessedEvent(result);
      } catch (Exception messagingExceptionHandlerException) {
        // TODO MULE-10370 - Once custom-exception-strategy gets removed we need to allow the inner exception handler to throw
        // MessagingException for the cases where there's a failure inside the on-error-* element.
        if (messagingExceptionHandlerException.getCause() instanceof MessagingException) {
          throw (MessagingException) messagingExceptionHandlerException.getCause();
        }
        throw messagingExceptionHandlerException;
      }
      throw e;
    } catch (Exception e) {
      throw e;
    }
  }
}