//
//  ========================================================================
//  Copyright (c) 1995-2019 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.maven.plugin;

import java.io.File;
import java.util.List;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Execute;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.plugins.annotations.ResolutionScope;
import org.eclipse.jetty.util.PathWatcher;
import org.eclipse.jetty.util.PathWatcher.PathWatchEvent;

/**
 * <p>
 * This goal is used to assemble your webapp into an exploded war and automatically deploy it to Jetty.
 * </p>
 * <p>
 * Once invoked, the plugin runs continuously, and can be configured to scan for changes in the pom.xml and
 * to WEB-INF/web.xml, WEB-INF/classes or WEB-INF/lib and hot redeploy when a change is detected.
 * </p>
 * <p>
 * You may also specify the location of a jetty.xml file whose contents will be applied before any plugin configuration.
 * This can be used, for example, to deploy a static webapp that is not part of your maven build.
 * </p>
 */
@Mojo(name = "run-exploded", requiresDependencyResolution = ResolutionScope.COMPILE_PLUS_RUNTIME)
@Execute(phase = LifecyclePhase.PACKAGE)
public class JettyRunWarExplodedMojo extends AbstractJettyMojo
{

    /**
     * The location of the war file.
     */
    @Parameter(defaultValue = "${project.build.directory}/${project.build.finalName}", required = true)
    private File war;

    /**
     * @see org.eclipse.jetty.maven.plugin.AbstractJettyMojo#execute()
     */
    @Override
    public void execute() throws MojoExecutionException, MojoFailureException
    {
        super.execute();
    }

    @Override
    public void finishConfigurationBeforeStart() throws Exception
    {
        server.setStopAtShutdown(true); //as we will normally be stopped with a cntrl-c, ensure server stopped 
        super.finishConfigurationBeforeStart();
    }

    /**
     * @see AbstractJettyMojo#configureScanner()
     */
    @Override
    public void configureScanner() throws MojoExecutionException
    {
        scanner.watch(project.getFile().toPath());
        File webInfDir = new File(war, "WEB-INF");
        File webXml = new File(webInfDir, "web.xml");
        if (webXml.exists())
            scanner.watch(webXml.toPath());
        File jettyWebXmlFile = findJettyWebXmlFile(webInfDir);
        if (jettyWebXmlFile != null)
            scanner.watch(jettyWebXmlFile.toPath());
        File jettyEnvXmlFile = new File(webInfDir, "jetty-env.xml");
        if (jettyEnvXmlFile.exists())
            scanner.watch(jettyEnvXmlFile.toPath());

        File classes = new File(webInfDir, "classes");
        if (classes.exists())
        {
            PathWatcher.Config classesConfig = new PathWatcher.Config(classes.toPath());
            classesConfig.setRecurseDepth(PathWatcher.Config.UNLIMITED_DEPTH);
            scanner.watch(classesConfig);
        }

        File lib = new File(webInfDir, "lib");
        if (lib.exists())
        {
            PathWatcher.Config libConfig = new PathWatcher.Config(lib.toPath());
            libConfig.setRecurseDepth(PathWatcher.Config.UNLIMITED_DEPTH);
            scanner.watch(libConfig);
        }

        scanner.addListener(new PathWatcher.EventListListener()
        {

            @Override
            public void onPathWatchEvents(List<PathWatchEvent> events)
            {
                try
                {
                    boolean reconfigure = false;
                    for (PathWatchEvent e : events)
                    {
                        if (e.getPath().equals(project.getFile().toPath()))
                        {
                            reconfigure = true;
                            break;
                        }
                    }
                    restartWebApp(reconfigure);
                }
                catch (Exception e)
                {
                    getLog().error("Error reconfiguring/restarting webapp after change in watched files", e);
                }
            }
        });
    }

    /**
     * @see org.eclipse.jetty.maven.plugin.AbstractJettyMojo#restartWebApp(boolean)
     */
    @Override
    public void restartWebApp(boolean reconfigureScanner) throws Exception
    {
        getLog().info("Restarting webapp");
        getLog().debug("Stopping webapp ...");
        stopScanner();
        webApp.stop();
        getLog().debug("Reconfiguring webapp ...");

        checkPomConfiguration();

        // check if we need to reconfigure the scanner,
        // which is if the pom changes
        if (reconfigureScanner)
        {
            getLog().info("Reconfiguring scanner after change to pom.xml ...");
            scanner.reset();
            configureScanner();
        }

        getLog().debug("Restarting webapp ...");
        webApp.start();
        startScanner();
        getLog().info("Restart completed.");
    }

    /**
     * @see org.eclipse.jetty.maven.plugin.AbstractJettyMojo#configureWebApplication()
     */
    @Override
    public void configureWebApplication() throws Exception
    {
        super.configureWebApplication();
        webApp.setWar(war.getCanonicalPath());
    }
}
