/*
 * 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.module.launcher.coreextension;

import org.mule.runtime.container.api.ArtifactClassLoaderManagerAware;
import org.mule.runtime.container.api.CoreExtensionsAware;
import org.mule.runtime.container.api.MuleCoreExtension;
import org.mule.runtime.core.api.DefaultMuleException;
import org.mule.runtime.api.exception.MuleException;
import org.mule.runtime.api.lifecycle.InitialisationException;
import org.mule.runtime.module.artifact.api.classloader.ArtifactClassLoaderManager;
import org.mule.runtime.module.deployment.api.DeploymentListener;
import org.mule.runtime.module.deployment.api.DeploymentService;
import org.mule.runtime.module.deployment.api.DeploymentServiceAware;
import org.mule.runtime.module.repository.api.RepositoryServiceAware;
import org.mule.runtime.module.tooling.api.ToolingServiceAware;
import org.mule.runtime.module.repository.api.RepositoryService;
import org.mule.runtime.module.tooling.api.ToolingService;

import java.util.LinkedList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DefaultMuleCoreExtensionManagerServer implements MuleCoreExtensionManagerServer {

  protected static final Logger logger = LoggerFactory.getLogger(DefaultMuleCoreExtensionManagerServer.class);

  private final MuleCoreExtensionDiscoverer coreExtensionDiscoverer;
  private final MuleCoreExtensionDependencyResolver coreExtensionDependencyResolver;
  private List<MuleCoreExtension> coreExtensions = new LinkedList<>();
  private DeploymentService deploymentService;
  private RepositoryService repositoryService;
  private ToolingService toolingService;
  private List<MuleCoreExtension> orderedCoreExtensions;
  private ArtifactClassLoaderManager artifactClassLoaderManager;

  public DefaultMuleCoreExtensionManagerServer(MuleCoreExtensionDiscoverer coreExtensionDiscoverer,
                                               MuleCoreExtensionDependencyResolver coreExtensionDependencyResolver) {
    this.coreExtensionDiscoverer = coreExtensionDiscoverer;
    this.coreExtensionDependencyResolver = coreExtensionDependencyResolver;
  }

  @Override
  public void dispose() {
    for (MuleCoreExtension extension : coreExtensions) {
      try {
        extension.dispose();
      } catch (Exception ex) {
        logger.error("Error disposing core extension " + extension.getName(), ex);
      }
    }
  }

  @Override
  public void initialise() throws InitialisationException {
    try {
      coreExtensions = coreExtensionDiscoverer.discover();

      orderedCoreExtensions = coreExtensionDependencyResolver.resolveDependencies(coreExtensions);

      initializeCoreExtensions();

    } catch (Exception e) {
      throw new InitialisationException(e, this);
    }
  }

  @Override
  public void start() throws MuleException {
    logger.info("Starting core extensions");
    for (MuleCoreExtension extension : orderedCoreExtensions) {
      extension.start();
    }
  }

  @Override
  public void stop() throws MuleException {
    if (orderedCoreExtensions == null) {
      return;
    }

    for (int i = orderedCoreExtensions.size() - 1; i >= 0; i--) {
      MuleCoreExtension extension = orderedCoreExtensions.get(i);

      try {
        extension.stop();
      } catch (Throwable e) {
        logger.warn("Error stopping core extension: " + extension.getName(), e);
      }
    }
  }

  private void initializeCoreExtensions() throws InitialisationException, DefaultMuleException {
    logger.info("Initializing core extensions");

    for (MuleCoreExtension extension : orderedCoreExtensions) {
      if (extension instanceof DeploymentServiceAware) {
        ((DeploymentServiceAware) extension).setDeploymentService(deploymentService);
      }

      if (extension instanceof RepositoryServiceAware) {
        ((RepositoryServiceAware) extension).setRepositoryService(repositoryService);
      }

      if (extension instanceof ToolingServiceAware) {
        ((ToolingServiceAware) extension).setToolingService(toolingService);
      }

      if (extension instanceof DeploymentListener) {
        deploymentService.addDeploymentListener((DeploymentListener) extension);
      }

      if (extension instanceof CoreExtensionsAware) {
        ((CoreExtensionsAware) extension).setCoreExtensions(orderedCoreExtensions);
      }

      if (extension instanceof ArtifactClassLoaderManagerAware) {
        ((ArtifactClassLoaderManagerAware) extension).setArtifactClassLoaderManager(artifactClassLoaderManager);
      }

      extension.initialise();
    }
  }

  @Override
  public void setDeploymentService(DeploymentService deploymentService) {
    this.deploymentService = deploymentService;
  }

  @Override
  public void setRepositoryService(RepositoryService repositoryService) {
    this.repositoryService = repositoryService;
  }

  public void setToolingService(ToolingService toolingService) {
    this.toolingService = toolingService;
  }

  @Override
  public void setArtifactClassLoaderManager(ArtifactClassLoaderManager artifactClassLoaderManager) {
    this.artifactClassLoaderManager = artifactClassLoaderManager;
  }
}
