/*
 * 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.internal.lifecycle.phases;

import org.mule.runtime.core.api.MuleContext;
import org.mule.runtime.core.api.agent.Agent;
import org.mule.runtime.core.api.component.Component;
import org.mule.runtime.core.api.config.Config;
import org.mule.runtime.core.api.construct.FlowConstruct;
import org.mule.runtime.api.lifecycle.Disposable;
import org.mule.runtime.api.lifecycle.Initialisable;
import org.mule.runtime.api.lifecycle.LifecycleException;
import org.mule.runtime.core.api.processor.InterceptingMessageProcessor;
import org.mule.runtime.core.api.routing.OutboundRouter;
import org.mule.runtime.core.api.security.SecurityManager;
import org.mule.runtime.core.api.source.MessageSource;
import org.mule.runtime.core.streaming.StreamingManager;
import org.mule.runtime.core.api.transport.LegacyConnector;
import org.mule.runtime.core.config.i18n.CoreMessages;
import org.mule.runtime.core.lifecycle.LifecycleObject;
import org.mule.runtime.core.lifecycle.NotificationLifecycleObject;
import org.mule.runtime.core.util.annotation.AnnotationMetaData;
import org.mule.runtime.core.util.annotation.AnnotationUtils;
import org.mule.runtime.extension.api.runtime.ConfigurationProvider;

import java.lang.reflect.Method;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import javax.annotation.PostConstruct;

/**
 * The MuleContextInitialisePhase defines the lifecycle behaviour when the Mule context is initialised. The MuleContext is
 * associated with one or more registries that inherit the lifecycle of the MuleContext.
 * <p/>
 * This phase is responsible for initialising objects. Any object that implements
 * {@link Initialisable} will have its
 * {@link Initialisable#initialise()} method called. Objects are initialised in the order
 * based on type: {@link org.mule.runtime.core.api.agent.Agent}, {@link org.mule.runtime.core.api.construct.FlowConstruct},
 * followed by any other object that implements {@link Initialisable}.
 *
 * @see org.mule.runtime.core.api.MuleContext
 * @see org.mule.runtime.core.api.lifecycle.LifecycleManager
 * @see Initialisable
 * @since 3.0
 */
public class MuleContextInitialisePhase extends DefaultLifecyclePhase {

  public MuleContextInitialisePhase() {
    super(Initialisable.PHASE_NAME, Initialisable.class, Disposable.PHASE_NAME);
    registerSupportedPhase(NotInLifecyclePhase.PHASE_NAME);

    Set<LifecycleObject> orderedObjects = new LinkedHashSet<>();
    orderedObjects.add(new NotificationLifecycleObject(StreamingManager.class));
    orderedObjects.add(new NotificationLifecycleObject(ConfigurationProvider.class));
    orderedObjects.add(new NotificationLifecycleObject(Config.class));
    orderedObjects.add(new NotificationLifecycleObject(LegacyConnector.class));
    orderedObjects.add(new NotificationLifecycleObject(Agent.class));
    orderedObjects.add(new NotificationLifecycleObject(SecurityManager.class));
    orderedObjects.add(new NotificationLifecycleObject(FlowConstruct.class));
    orderedObjects.add(new NotificationLifecycleObject(Initialisable.class));
    setOrderedLifecycleObjects(orderedObjects);
    setIgnoredObjectTypes(new Class[] {Component.class, MessageSource.class, InterceptingMessageProcessor.class,
        OutboundRouter.class, MuleContext.class});
  }


  @Override
  public void applyLifecycle(Object o) throws LifecycleException {
    // retain default Lifecycle behaviour
    super.applyLifecycle(o);
    if (o == null) {
      return;
    }
    if (ignoreType(o.getClass())) {
      return;
    }

    // Lets check for {@link PostConstruct} annotations on methods of this object and invoke
    List<AnnotationMetaData> annos = AnnotationUtils.getMethodAnnotations(o.getClass(), PostConstruct.class);

    // Note that the registry has a processor that validates that there is at most one {@link PostConstruct} annotation
    // per object and that the method conforms to a lifecycle method
    if (annos.size() == 1) {
      AnnotationMetaData anno = annos.get(0);

      try {
        ((Method) anno.getMember()).invoke(o);
      } catch (Exception e) {
        throw new LifecycleException(CoreMessages.failedToInvokeLifecycle(anno.getMember().getName(), o), e, this);
      }
    }

  }
}