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/*
 * Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.java;

import com.caucho.loader.DynamicClassLoader;
import com.caucho.loader.NonScanDynamicClassLoader;
import com.caucho.loader.EnvironmentClassLoader;
import com.caucho.util.CharBuffer;
import com.caucho.vfs.*;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Compiles Java source, returning the loaded class.
 */
public class InternalCompiler extends AbstractJavaCompiler {
  private static final Logger log
    = Logger.getLogger(InternalCompiler.class.getName());

  private static boolean _hasCompiler; // already tested for compiler
  private static DynamicClassLoader _internalLoader;
  
  Process _process;
  String _userPrefix;
  
  boolean _isDead;
  
  public InternalCompiler(JavaCompilerUtil compiler)
  {
    super(compiler);
  }

  protected void compileInt(String []path, LineMap lineMap)
    throws IOException, JavaCompileException
  {
    Path javaHome = null;
    
    if (! _hasCompiler) {
      JavaCompileException exn = null;
      try {
        ClassLoader loader = ClassLoader.getSystemClassLoader();
        Class.forName("com.sun.tools.javac.Main", false, loader);

        _hasCompiler = true;
      } catch (Exception e) {
      }

      try {
        DynamicClassLoader env;
        env = new NonScanDynamicClassLoader(ClassLoader.getSystemClassLoader());

        javaHome = Vfs.lookup(System.getProperty("java.home"));
        Path jar = javaHome.lookup("./lib/tools.jar");
        if (jar.canRead())
          env.addJar(jar);
        jar = javaHome.lookup("../lib/tools.jar");
        if (jar.canRead())
          env.addJar(jar);

        Class.forName("com.sun.tools.javac.Main", false, env);

        _hasCompiler = true;
      } catch (ClassNotFoundException e) {
        throw new JavaCompileException(L.l("Resin can't load com.sun.tools.javac.Main.  Usually this means that the JDK tools.jar is missing from the classpath, possibly because of using a JRE instead of the JDK.  You can either add tools.jar to the classpath or change the compiler to an external one with  or jikes.\n  {0}\n  JAVA_HOME={1}", String.valueOf(e), javaHome.getNativePath()), e);
      }
    }

    executeInt(path, lineMap);
  }

  /**
   * Compiles the names files.
   */
  private void executeInt(String []path, LineMap lineMap)
    throws JavaCompileException, IOException
  {
    MemoryStream tempStream = new MemoryStream();
    WriteStream error = new WriteStream(tempStream);

    try {
      // String parent = javaPath.getParent().getNativePath();

      ArrayList argList = new ArrayList();
      argList.add("-d");
      argList.add(_compiler.getClassDirName());
      if (_compiler.getEncoding() != null) {
        String encoding = Encoding.getJavaName(_compiler.getEncoding());
        if (encoding != null && ! encoding.equals("ISO8859_1")) {
          argList.add("-encoding");
          argList.add(_compiler.getEncoding());
        }
      }

      argList.add("-classpath");
      argList.add(_compiler.getClassPath());

      ArrayList args = _compiler.getArgs();
      if (args != null)
        argList.addAll(args);

      for (int i = 0; i < path.length; i++) {
        Path javaPath = _compiler.getSourceDir().lookup(path[i]);
        argList.add(javaPath.getNativePath());
      }

      if (log.isLoggable(Level.FINER)) {
        CharBuffer msg = new CharBuffer();
        msg.append("javac(int)");
        for (int i = 0; i < argList.size(); i++) {
          if (argList.get(i).equals("-classpath")
              && ! log.isLoggable(Level.FINEST)) {
            i++;
            continue;
          }

          msg.append(" ");
          msg.append(argList.get(i));
        }

        log.finer(msg.toString());
      }

      String []argArray = argList.toArray(new String[argList.size()]);

      int status = -1;
      
      Thread thread = Thread.currentThread();
      ClassLoader oldLoader = thread.getContextClassLoader();
      
      DynamicClassLoader env;

      env = new NonScanDynamicClassLoader(ClassLoader.getSystemClassLoader());
      
      Path javaHome = Vfs.lookup(System.getProperty("java.home"));
      Path jar = javaHome.lookup("./lib/tools.jar");
      if (jar.canRead())
        env.addJar(jar);
      jar = javaHome.lookup("../lib/tools.jar");
      if (jar.canRead())
        env.addJar(jar);

      // env = _internalLoader;


      try {
        thread.setContextClassLoader(env);

        try {
          Class cl = Class.forName("com.sun.tools.javac.Main", false, env);
          Object compiler = cl.newInstance();
          Method compile = null;

          Object value = null;

          try {
            compile = cl.getMethod("compile", new Class[] { String[].class , PrintWriter.class });
            value = compile.invoke(compiler, new Object[] { argArray, error.getPrintWriter() });

          } catch (Throwable e) {
            log.log(Level.FINER, e.toString(), e);
          }

          if (compile == null) {
            compile = cl.getMethod("compile", new Class[] { String[].class });
            value = compile.invoke(compiler, new Object[] { argArray });
          }

          if (value instanceof Integer)
            status = ((Integer) value).intValue();
        } catch (ClassNotFoundException e) {
          throw new JavaCompileException(L.l("Can't find internal Java compiler.  Either configure an external compiler with  or use a JDK which contains a Java compiler."), e);
        } catch (NoSuchMethodException e) {
          throw new JavaCompileException(e);
        } catch (InstantiationException e) {
          throw new JavaCompileException(e);
        } catch (IllegalAccessException e) {
          throw new JavaCompileException(e);
        } catch (InvocationTargetException e) {
          throw new IOExceptionWrapper(e);
        }
      
        error.close();
        tempStream.close();
      } finally {
        thread.setContextClassLoader(oldLoader);
      }

      ReadStream read = tempStream.openReadAndSaveBuffer();
      JavacErrorParser parser = new JavacErrorParser(this, path[0], _compiler.getEncoding());

      String errors = parser.parseErrors((InputStream) read, lineMap);
      read.close();

      if (errors != null)
        errors = errors.trim();

      if (log.isLoggable(Level.FINE)) {
        read = tempStream.openReadAndSaveBuffer();
        CharBuffer cb = new CharBuffer();
        int ch;
        while ((ch = read.read()) >= 0) {
          cb.append((char) ch);
        }
        read.close();

        log.fine(cb.toString());
      }
      else if (status == 0 && errors != null && ! errors.equals("")) {
        final String msg = errors;

        new com.caucho.loader.ClassLoaderContext(_compiler.getClassLoader()) {
          public void run()
          {
            log.warning(msg);
          }
        };
      }

      if (status != 0)
        throw new JavaCompileException(errors);
    } finally {
      tempStream.destroy();
    }
  }
}