//
   //  ========================================================================
   //  Copyright (c) 1995-2013 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.BufferedOutputStream;
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.LineNumberReader;
  import java.io.OutputStream;
  import java.net.MalformedURLException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  import java.util.Properties;
  import java.util.Random;
  import java.util.Set;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugin.descriptor.PluginDescriptor;
  import org.apache.maven.project.MavenProject;
  import org.eclipse.jetty.util.IO;
  
  
  /**
   * <p>
   *  This goal is used to assemble your webapp into a war and automatically deploy it to Jetty in a forked JVM.
   *  </p>
   *  <p>
   *  You need to define a jetty.xml file to configure connectors etc and a context xml file that sets up anything special
   *  about your webapp. This plugin will fill in the:
   *  <ul>
   *  <li>context path
   *  <li>classes
   *  <li>web.xml
   *  <li>root of the webapp
   *  </ul>
   *  Based on a combination of information that you supply and the location of files in your unassembled webapp.
   *  </p>
   *  <p>
   *  There is a <a href="run-war-mojo.html">reference guide</a> to the configuration parameters for this plugin, and more detailed information
   *  with examples in the <a href="http://docs.codehaus.org/display/JETTY/Maven+Jetty+Plugin/">Configuration Guide</a>.
   *  </p>
   * 
   * @goal run-forked
   * @requiresDependencyResolution test
   * @execute phase="test-compile"
   * @description Runs Jetty in forked JVM on an unassembled webapp
   *
   */
  public class JettyRunForkedMojo extends AbstractMojo
  {    
      public static final String DEFAULT_WEBAPP_SRC = "src"+File.separator+"main"+File.separator+"webapp";
      public static final String FAKE_WEBAPP = "webapp-tmp";
      
      
      public String PORT_SYSPROPERTY = "jetty.port";
      
      /**
       * Whether or not to include dependencies on the plugin's classpath with &lt;scope&gt;provided&lt;/scope&gt;
       * Use WITH CAUTION as you may wind up with duplicate jars/classes.
       * @parameter  default-value="false"
       */
      protected boolean useProvidedScope;
      
      
      /**
       * The maven project.
       *
       * @parameter expression="${project}"
       * @required
       * @readonly
       */
      private MavenProject project;
 
     
     /**
      * If true, the &lt;testOutputDirectory&gt;
      * and the dependencies of &lt;scope&gt;test&lt;scope&gt;
      * will be put first on the runtime classpath.
      * @parameter alias="useTestClasspath" default-value="false"
      */
     private boolean useTestScope;
     
     
     /**
      * The default location of the web.xml file. Will be used
      * if &lt;webAppConfig&gt;&lt;descriptor&gt; is not set.
      * 
      * @parameter expression="${basedir}/src/main/webapp/WEB-INF/web.xml"
      * @readonly
      */
     private String webXml;
     
     
     /**
      * The target directory
      * 
      * @parameter expression="${project.build.directory}"
      * @required
      * @readonly
      */
     protected File target;
     
     
     /**
      * The temporary directory to use for the webapp.
      * Defaults to target/tmp
      *
      * @parameter expression="${project.build.directory}/tmp"
      * @required
      * @readonly
      */
     protected File tmpDirectory;
 
     
     /**
      * The directory containing generated classes.
      *
      * @parameter expression="${project.build.outputDirectory}"
      * @required
      * 
      */
     private File classesDirectory;    
     
     
     /**
      * The directory containing generated test classes.
      * 
      * @parameter expression="${project.build.testOutputDirectory}"
      * @required
      */
     private File testClassesDirectory;
    
     
     /**
      * Root directory for all html/jsp etc files
      *
      * @parameter expression="${basedir}/src/main/webapp"
      *
      */
     private File webAppSourceDirectory;   
 
     
     /**
      * If true, the webAppSourceDirectory will be first on the list of 
      * resources that form the resource base for the webapp. If false, 
      * it will be last.
      * 
      * @parameter  default-value="true"
      */
     private boolean baseAppFirst;
     
 
     /**
      * Location of jetty xml configuration files whose contents 
      * will be applied before any plugin configuration. Optional.
      * @parameter
      */
     private String jettyXml;
     
     /**
      * The context path for the webapp. Defaults to / for jetty-9
      *
      * @parameter expression="/"
      */
     private String contextPath;
 
 
     /**
      * Location of a context xml configuration file whose contents
      * will be applied to the webapp AFTER anything in &lt;webAppConfig&gt;.Optional.
      * @parameter
      */
     private String contextXml;
 
     
     /**  
      * @parameter expression="${jetty.skip}" default-value="false"
      */
     private boolean skip;
 
     
     /**
      * Port to listen to stop jetty on executing -DSTOP.PORT=&lt;stopPort&gt; 
      * -DSTOP.KEY=&lt;stopKey&gt; -jar start.jar --stop
      * @parameter
      * @required
      */
     protected int stopPort;
  
     
     /**
      * Key to provide when stopping jetty on executing java -DSTOP.KEY=&lt;stopKey&gt; 
      * -DSTOP.PORT=&lt;stopPort&gt; -jar start.jar --stop
      * @parameter
      * @required
      */
     protected String stopKey;
 
     
     /**
      * Arbitrary jvm args to pass to the forked process
      * @parameter
      */
     private String jvmArgs;
     
     
     /**
      * @parameter expression="${plugin.artifacts}"
      * @readonly
      */
     private List pluginArtifacts;
     
     
     /**
      * @parameter expression="${plugin}"
      * @readonly
      */
     private PluginDescriptor plugin;
     
     
     /**
      * @parameter expression="true" default-value="true"
      */
     private boolean waitForChild;
 
     /**
      * @parameter default-value="50"
      */
     private int maxStartupLines;
 
     /**
      * The forked jetty instance
      */
     private Process forkedProcess;
     
     
     /**
      * Random number generator
      */
     private Random random;    
     
     
     
     
     
     
     /**
      * ShutdownThread
      *
      *
      */
     public class ShutdownThread extends Thread
     {
         public ShutdownThread()
         {
             super("RunForkedShutdown");
         }
         
         public void run ()
         {
             if (forkedProcess != null && waitForChild)
             {
                 forkedProcess.destroy();
             }
         }
     }
     
 
     
     
     /**
      * ConsoleStreamer
      * 
      * Simple streamer for the console output from a Process
      */
     private static class ConsoleStreamer implements Runnable
     {
         private String mode;
         private BufferedReader reader;
 
         public ConsoleStreamer(String mode, InputStream is)
         {
             this.mode = mode;
             this.reader = new BufferedReader(new InputStreamReader(is));
         }
 
 
         public void run()
         {
             String line;
             try
             {
                 while ((line = reader.readLine()) != (null))
                 {
                     System.out.println("[" + mode + "] " + line);
                 }
             }
             catch (IOException ignore)
             {
                 /* ignore */
             }
             finally
             {
                 IO.close(reader);
             }
         }
     }
     
     
     
     
     
     /**
      * @see org.apache.maven.plugin.Mojo#execute()
      */
     public void execute() throws MojoExecutionException, MojoFailureException
     {
         getLog().info("Configuring Jetty for project: " + project.getName());
         if (skip)
         {
             getLog().info("Skipping Jetty start: jetty.skip==true");
             return;
         }
         PluginLog.setLog(getLog());
         Runtime.getRuntime().addShutdownHook(new ShutdownThread());
         random = new Random();
         startJettyRunner();
     }
     
     
     
     
     /**
      * @return
      * @throws MojoExecutionException
      */
     public List<String> getProvidedJars() throws MojoExecutionException
     {  
         //if we are configured to include the provided dependencies on the plugin's classpath
         //(which mimics being on jetty's classpath vs being on the webapp's classpath), we first
         //try and filter out ones that will clash with jars that are plugin dependencies, then
         //create a new classloader that we setup in the parent chain.
         if (useProvidedScope)
         {
             
                 List<String> provided = new ArrayList<String>();        
                 for ( Iterator<Artifact> iter = project.getArtifacts().iterator(); iter.hasNext(); )
                 {                   
                     Artifact artifact = iter.next();
                     if (Artifact.SCOPE_PROVIDED.equals(artifact.getScope()) && !isPluginArtifact(artifact))
                     {
                         provided.add(artifact.getFile().getAbsolutePath());
                         if (getLog().isDebugEnabled()) { getLog().debug("Adding provided artifact: "+artifact);}
                     }
                 }
                 return provided;
 
         }
         else
             return null;
     }
     
    
     
     
     /**
      * @return
      * @throws MojoExecutionException
      */
     public File prepareConfiguration() throws MojoExecutionException
     {
         try
         {   
             //work out the configuration based on what is configured in the pom
             File propsFile = new File (target, "fork.props");
             if (propsFile.exists())
                 propsFile.delete();   
 
             propsFile.createNewFile();
             //propsFile.deleteOnExit();
 
             Properties props = new Properties();
 
 
             //web.xml
             if (webXml != null)
                 props.put("web.xml", webXml);
 
             //sort out the context path
             if (contextPath != null)
                 props.put("context.path", contextPath);
 
             //sort out the tmp directory (make it if it doesn't exist)
             if (tmpDirectory != null)
             {
                 if (!tmpDirectory.exists())
                     tmpDirectory.mkdirs();
                 props.put("tmp.dir", tmpDirectory.getAbsolutePath());
             }
 
             //sort out base dir of webapp
             if (webAppSourceDirectory == null || !webAppSourceDirectory.exists())
             {
                 webAppSourceDirectory = new File (project.getBasedir(), DEFAULT_WEBAPP_SRC);       
                 if (!webAppSourceDirectory.exists())
                 {
                     //try last resort of making a fake empty dir
                     File target = new File(project.getBuild().getDirectory());
                     webAppSourceDirectory = new File(target, FAKE_WEBAPP);
                     if (!webAppSourceDirectory.exists())
                         webAppSourceDirectory.mkdirs();  
                 }
             }
             props.put("base.dir", webAppSourceDirectory.getAbsolutePath());
 
             //sort out the resource base directories of the webapp
             StringBuilder builder = new StringBuilder();
             props.put("base.first", Boolean.toString(baseAppFirst));
 
             //web-inf classes
             List<File> classDirs = getClassesDirs();
             StringBuffer strbuff = new StringBuffer();
             for (int i=0; i<classDirs.size(); i++)
             {
                 File f = classDirs.get(i);
                 strbuff.append(f.getAbsolutePath());
                 if (i < classDirs.size()-1)
                     strbuff.append(",");
             }
 
             if (classesDirectory != null)
             {
                 props.put("classes.dir", classesDirectory.getAbsolutePath());
             }
             
             if (useTestScope && testClassesDirectory != null)
             {
                 props.put("testClasses.dir", testClassesDirectory.getAbsolutePath());
             }
 
             //web-inf lib
             List<File> deps = getDependencyFiles();
             strbuff.setLength(0);
             for (int i=0; i<deps.size(); i++)
             {
                 File d = deps.get(i);
                 strbuff.append(d.getAbsolutePath());
                 if (i < deps.size()-1)
                     strbuff.append(",");
             }
             props.put("lib.jars", strbuff.toString());
 
             //any war files
             List<Artifact> warArtifacts = getWarArtifacts(); 
             for (int i=0; i<warArtifacts.size(); i++)
             {
                 strbuff.setLength(0);           
                 Artifact a  = warArtifacts.get(i);
                 strbuff.append(a.getGroupId()+",");
                 strbuff.append(a.getArtifactId()+",");
                 strbuff.append(a.getFile().getAbsolutePath());
                 props.put("maven.war.artifact."+i, strbuff.toString());
             }
           
             
             //any overlay configuration
             WarPluginInfo warPlugin = new WarPluginInfo(project);
             
             //add in the war plugins default includes and excludes
             props.put("maven.war.includes", toCSV(warPlugin.getDependentMavenWarIncludes()));
             props.put("maven.war.excludes", toCSV(warPlugin.getDependentMavenWarExcludes()));
             
             
             List<OverlayConfig> configs = warPlugin.getMavenWarOverlayConfigs();
             int i=0;
             for (OverlayConfig c:configs)
             {
                 props.put("maven.war.overlay."+(i++), c.toString());
             }
             
             try (OutputStream out = new BufferedOutputStream(new FileOutputStream(propsFile)))
             {
                 props.store(out, "properties for forked webapp");
             }
             return propsFile;
         }
         catch (Exception e)
         {
             throw new MojoExecutionException("Prepare webapp configuration", e);
         }
     }
     
 
     
     
     /**
      * @return
      */
     private List<File> getClassesDirs ()
     {
         List<File> classesDirs = new ArrayList<File>();
         
         //if using the test classes, make sure they are first
         //on the list
         if (useTestScope && (testClassesDirectory != null))
             classesDirs.add(testClassesDirectory);
         
         if (classesDirectory != null)
             classesDirs.add(classesDirectory);
         
         return classesDirs;
     }
   
     
   
     
     /**
      * @return
      * @throws MalformedURLException
      * @throws IOException
      */
     private List<Artifact> getWarArtifacts()
     throws MalformedURLException, IOException
     {
         List<Artifact> warArtifacts = new ArrayList<Artifact>();
         for ( Iterator<Artifact> iter = project.getArtifacts().iterator(); iter.hasNext(); )
         {
             Artifact artifact = (Artifact) iter.next();  
             
             if (artifact.getType().equals("war"))
                 warArtifacts.add(artifact);
         }
 
         return warArtifacts;
     }
     
     
     
     
     /**
      * @return
      */
     private List<File> getDependencyFiles ()
     {
         List<File> dependencyFiles = new ArrayList<File>();
     
         for ( Iterator<Artifact> iter = project.getArtifacts().iterator(); iter.hasNext(); )
         {
             Artifact artifact = (Artifact) iter.next();
             
             if (((!Artifact.SCOPE_PROVIDED.equals(artifact.getScope())) && (!Artifact.SCOPE_TEST.equals( artifact.getScope()))) 
                     ||
                 (useTestScope && Artifact.SCOPE_TEST.equals( artifact.getScope())))
             {
                 dependencyFiles.add(artifact.getFile());
                 getLog().debug( "Adding artifact " + artifact.getFile().getName() + " for WEB-INF/lib " );   
             }
         }
         
         return dependencyFiles; 
     }
     
     
     
     
     /**
      * @param artifact
      * @return
      */
     public boolean isPluginArtifact(Artifact artifact)
     {
         if (pluginArtifacts == null || pluginArtifacts.isEmpty())
             return false;
         
         boolean isPluginArtifact = false;
         for (Iterator<Artifact> iter = pluginArtifacts.iterator(); iter.hasNext() && !isPluginArtifact; )
         {
             Artifact pluginArtifact = iter.next();
             if (getLog().isDebugEnabled()) { getLog().debug("Checking "+pluginArtifact);}
             if (pluginArtifact.getGroupId().equals(artifact.getGroupId()) && pluginArtifact.getArtifactId().equals(artifact.getArtifactId()))
                 isPluginArtifact = true;
         }
         
         return isPluginArtifact;
     }
     
     
     
     
     /**
      * @return
      * @throws Exception
      */
     private Set<Artifact> getExtraJars()
     throws Exception
     {
         Set<Artifact> extraJars = new HashSet<Artifact>();
   
         
         List l = pluginArtifacts;
         Artifact pluginArtifact = null;
 
         if (l != null)
         {
             Iterator itor = l.iterator();
             while (itor.hasNext() && pluginArtifact == null)
             {              
                 Artifact a = (Artifact)itor.next();
                 if (a.getArtifactId().equals(plugin.getArtifactId())) //get the jetty-maven-plugin jar
                 {
                     extraJars.add(a);
                 }
             }
         }
 
         return extraJars;
     }
 
     
 
     
     /**
      * @throws MojoExecutionException
      */
     public void startJettyRunner() throws MojoExecutionException
     {      
         try
         {
         
             File props = prepareConfiguration();
             
             List<String> cmd = new ArrayList<String>();
             cmd.add(getJavaBin());
             
             if (jvmArgs != null)
             {
                 String[] args = jvmArgs.split(" ");
                 for (int i=0;args != null && i<args.length;i++)
                 {
                     if (args[i] !=null && !"".equals(args[i]))
                         cmd.add(args[i].trim());
                 }
             }
             
             String classPath = getClassPath();
             if (classPath != null && classPath.length() > 0)
             {
                 cmd.add("-cp");
                 cmd.add(classPath);
             }
             cmd.add(Starter.class.getCanonicalName());
             
             if (stopPort > 0 && stopKey != null)
             {
                 cmd.add("--stop-port");
                 cmd.add(Integer.toString(stopPort));
                 cmd.add("--stop-key");
                 cmd.add(stopKey);
             }
             if (jettyXml != null)
             {
                 cmd.add("--jetty-xml");
                 cmd.add(jettyXml);
             }
         
             if (contextXml != null)
             {
                 cmd.add("--context-xml");
                 cmd.add(contextXml);
             }
             
             cmd.add("--props");
             cmd.add(props.getAbsolutePath());
             
             String token = createToken();
             cmd.add("--token");
             cmd.add(token);
             
             ProcessBuilder builder = new ProcessBuilder(cmd);
             builder.directory(project.getBasedir());
             
             if (PluginLog.getLog().isDebugEnabled())
                 PluginLog.getLog().debug(Arrays.toString(cmd.toArray()));
             
             PluginLog.getLog().info("Forked process starting");
 
             if (waitForChild)
             {
                 forkedProcess = builder.start();
                 startPump("STDOUT",forkedProcess.getInputStream());
                 startPump("STDERR",forkedProcess.getErrorStream());
                 int exitcode = forkedProcess.waitFor();            
                 PluginLog.getLog().info("Forked execution exit: "+exitcode);
             }
             else
             {   //merge stderr and stdout from child
                 builder.redirectErrorStream(true);
                 forkedProcess = builder.start();
 
                 //wait for the child to be ready before terminating.
                 //child indicates it has finished starting by printing on stdout the token passed to it
                 try
                 {
                     String line = "";
                     try (InputStream is = forkedProcess.getInputStream();
                             LineNumberReader reader = new LineNumberReader(new InputStreamReader(is)))
                     {
                         int attempts = maxStartupLines; //max lines we'll read trying to get token
                         while (attempts>0 && line != null)
                         {
                             --attempts;
                             line = reader.readLine();
                             if (line != null && line.startsWith(token))
                                 break;
                         }
 
                     }
 
                     if (line != null && line.trim().equals(token))
                         PluginLog.getLog().info("Forked process started.");
                     else
                     {
                         String err = (line == null?"":(line.startsWith(token)?line.substring(token.length()):line));
                         PluginLog.getLog().info("Forked process startup errors"+(!"".equals(err)?", received: "+err:""));
                     }
                 }
                 catch (Exception e)
                 {
                     throw new MojoExecutionException ("Problem determining if forked process is ready: "+e.getMessage());
                 }
 
             }
         }
         catch (InterruptedException ex)
         {
             if (forkedProcess != null && waitForChild)
                 forkedProcess.destroy();
             
             throw new MojoExecutionException("Failed to start Jetty within time limit");
         }
         catch (Exception ex)
         {
             if (forkedProcess != null && waitForChild)
                 forkedProcess.destroy();
             
             throw new MojoExecutionException("Failed to create Jetty process", ex);
         }
     }
     
  
 
     
     /**
      * @return
      * @throws Exception
      */
     public String getClassPath() throws Exception
     {
         StringBuilder classPath = new StringBuilder();
         for (Object obj : pluginArtifacts)
         {
             Artifact artifact = (Artifact) obj;
             if ("jar".equals(artifact.getType()))
             {
                 if (classPath.length() > 0)
                 {
                     classPath.append(File.pathSeparator);
                 }
                 classPath.append(artifact.getFile().getAbsolutePath());
 
             }
         }
         
         //Any jars that we need from the plugin environment (like the ones containing Starter class)
         Set<Artifact> extraJars = getExtraJars();
         for (Artifact a:extraJars)
         { 
             classPath.append(File.pathSeparator);
             classPath.append(a.getFile().getAbsolutePath());
         }
         
         
         //Any jars that we need from the project's dependencies because we're useProvided
         List<String> providedJars = getProvidedJars();
         if (providedJars != null && !providedJars.isEmpty())
         {
             for (String jar:providedJars)
             {
                 classPath.append(File.pathSeparator);
                 classPath.append(jar);
                 if (getLog().isDebugEnabled()) getLog().debug("Adding provided jar: "+jar);
             }
         }
         
         return classPath.toString();
     }
 
     
 
     
     /**
      * @return
      */
     private String getJavaBin()
     {
         String javaexes[] = new String[]
         { "java", "java.exe" };
 
         File javaHomeDir = new File(System.getProperty("java.home"));
         for (String javaexe : javaexes)
         {
             File javabin = new File(javaHomeDir,fileSeparators("bin/" + javaexe));
             if (javabin.exists() && javabin.isFile())
             {
                 return javabin.getAbsolutePath();
             }
         }
 
         return "java";
     }
     
 
     
     
     /**
      * @param path
      * @return
      */
     public static String fileSeparators(String path)
     {
         StringBuilder ret = new StringBuilder();
         for (char c : path.toCharArray())
         {
             if ((c == '/') || (c == '\\'))
             {
                 ret.append(File.separatorChar);
             }
             else
             {
                 ret.append(c);
             }
         }
         return ret.toString();
     }
 
 
     
     
     /**
      * @param path
      * @return
      */
     public static String pathSeparators(String path)
     {
         StringBuilder ret = new StringBuilder();
         for (char c : path.toCharArray())
         {
             if ((c == ',') || (c == ':'))
             {
                 ret.append(File.pathSeparatorChar);
             }
             else
             {
                 ret.append(c);
             }
         }
         return ret.toString();
     }
 
 
     
     
     /**
      * @return
      */
     private String createToken ()
     {
         return Long.toString(random.nextLong()^System.currentTimeMillis(), 36).toUpperCase(Locale.ENGLISH);
     }
     
 
     
     
     /**
      * @param mode
      * @param inputStream
      */
     private void startPump(String mode, InputStream inputStream)
     {
         ConsoleStreamer pump = new ConsoleStreamer(mode,inputStream);
         Thread thread = new Thread(pump,"ConsoleStreamer/" + mode);
         thread.setDaemon(true);
         thread.start();
     }
 
 
     
     
     /**
      * @param strings
      * @return
      */
     private String toCSV (List<String> strings)
     {
         if (strings == null)
             return "";
         StringBuffer strbuff = new StringBuffer();
         Iterator<String> itor = strings.iterator();
         while (itor.hasNext())
         {
             strbuff.append(itor.next());
             if (itor.hasNext())
                 strbuff.append(",");
         }
         return strbuff.toString();
     }
 }