/*
 * 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.plugin.scripting.component;

import org.mule.runtime.core.api.DefaultMuleException;
import org.mule.runtime.core.api.MuleEventContext;
import org.mule.runtime.core.api.lifecycle.Callable;
import org.mule.runtime.core.config.i18n.CoreMessages;
import org.mule.runtime.core.util.StringUtils;

import groovy.lang.GroovyObject;
import groovy.lang.MetaMethod;

public class GroovyRefreshableBeanBuilder implements Callable {

  private volatile Object refreshableBean;
  private String methodName;
  private static final String ON_CALL = "onCall";
  private static final Class[] MULE_EVENT_CONTEXT = new Class[] {MuleEventContext.class};

  public GroovyRefreshableBeanBuilder() {
    super();
  }

  public Object onCall(MuleEventContext eventContext) throws Exception {
    if (refreshableBean instanceof GroovyObject) {
      GroovyObject script = (GroovyObject) refreshableBean;
      MetaMethod onCall = script.getMetaClass().pickMethod("onCall", MULE_EVENT_CONTEXT);

      if (onCall != null) {
        return script.invokeMethod(ON_CALL, eventContext);
      } else {
        if (StringUtils.isEmpty(methodName)) {
          throw new DefaultMuleException(CoreMessages.propertiesNotSet("methodName"));
        }

        return script.invokeMethod(methodName, eventContext.getMessage().getPayload().getValue());
      }

    }

    throw new Exception(new DefaultMuleException("script engine not supported"));
  }

  public Object getRefreshableBean() {
    return refreshableBean;
  }

  public void setRefreshableBean(Object refreshableBean) {
    this.refreshableBean = refreshableBean;
  }

  public String getMethodName() {
    return methodName;
  }

  public void setMethodName(String methodName) {
    this.methodName = methodName;
  }
}