/*

 * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code 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.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package com.sun.tools.javac;

import java.io.*;

import java.net.*;

import java.util.*;

import java.util.concurrent.*;

import java.util.logging.Logger;

import javax.tools.*;

/**

 * Java Compiler Server.  Can be used to speed up a set of (small)

 * compilation tasks by caching jar files between compilations.

 *

 * <p><b>This is NOT part of any API supported by Sun Microsystems.

 * If you write code that depends on this, you do so at your own

 * risk.  This code and its internal interfaces are subject to change

 * or deletion without notice.</b></p>

 *

 * @author Peter von der Ahé

 * @since 1.6

 */

class Server implements Runnable {

    private final BufferedReader in;

    private final OutputStream out;

    private final boolean isSocket;

    private static final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

    private static Logger logger = Logger.getLogger("com.sun.tools.javac");

    static class CwdFileManager extends ForwardingJavaFileManager<JavaFileManager> {

        String cwd;

        CwdFileManager(JavaFileManager fileManager) {

            super(fileManager);

        }

        String getAbsoluteName(String name) {

            if (new File(name).isAbsolute()) {

                return name;

            } else {

                return new File(cwd,name).getPath();

            }

        }

//      public JavaFileObject getFileForInput(String name)

//          throws IOException

//      {

//          return super.getFileForInput(getAbsoluteName(name));

//      }

    }

    // static CwdFileManager fm = new CwdFileManager(tool.getStandardFileManager());

    static StandardJavaFileManager fm = tool.getStandardFileManager(null, null, null);

    static {

        // Use the same file manager for all compilations.  This will

        // cache jar files in the standard file manager.  Use

        // tool.getStandardFileManager().close() to release.

        // FIXME tool.setFileManager(fm);

        logger.setLevel(java.util.logging.Level.SEVERE);

    }

    private Server(BufferedReader in, OutputStream out, boolean isSocket) {

        this.in = in;

        this.out = out;

        this.isSocket = isSocket;

    }

    private Server(BufferedReader in, OutputStream out) {

        this(in, out, false);

    }

    private Server(Socket socket) throws IOException, UnsupportedEncodingException {

        this(new BufferedReader(new InputStreamReader(socket.getInputStream(), "utf-8")),

             socket.getOutputStream(),

             true);

    }

    public void run() {

        List<String> args = new ArrayList<String>();

        int res = -1;

        try {

            String line = null;

            try {

                line = in.readLine();

            } catch (IOException e) {

                System.err.println(e.getLocalizedMessage());

                System.exit(0);

                line = null;

            }

            // fm.cwd=null;

            String cwd = null;

            while (line != null) {

                if (line.startsWith("PWD:")) {

                    cwd = line.substring(4);

                } else if (line.equals("END")) {

                    break;

                } else if (!"-XDstdout".equals(line)) {

                    args.add(line);

                }

                try {

                    line = in.readLine();

                } catch (IOException e) {

                    System.err.println(e.getLocalizedMessage());

                    System.exit(0);

                    line = null;

                }

            }

            Iterable<File> path = cwd == null ? null : Arrays.<File>asList(new File(cwd));

            // try { in.close(); } catch (IOException e) {}

            long msec = System.currentTimeMillis();

            try {

                synchronized (tool) {

                    for (StandardLocation location : StandardLocation.values())

                        fm.setLocation(location, path);

                    res = compile(out, fm, args);

                    // FIXME res = tool.run((InputStream)null, null, out, args.toArray(new String[args.size()]));

                }

            } catch (Throwable ex) {

                logger.log(java.util.logging.Level.SEVERE, args.toString(), ex);

                PrintWriter p = new PrintWriter(out, true);

                ex.printStackTrace(p);

                p.flush();

            }

            if (res >= 3) {

                logger.severe(String.format("problem: %s", args));

            } else {

                logger.info(String.format("success: %s", args));

            }

            // res = compile(args.toArray(new String[args.size()]), out);

            msec -= System.currentTimeMillis();

            logger.info(String.format("Real time: %sms", -msec));

        } finally {

            if (!isSocket) {

                try { in.close(); } catch (IOException e) {}

            }

            try {

                out.write(String.format("EXIT: %s%n", res).getBytes());

            } catch (IOException ex) {

                logger.log(java.util.logging.Level.SEVERE, args.toString(), ex);

            }

            try {

                out.flush();

                out.close();

            } catch (IOException ex) {

                logger.log(java.util.logging.Level.SEVERE, args.toString(), ex);

            }

            logger.info(String.format("EXIT: %s", res));

        }

    }

    public static void main(String... args) throws FileNotFoundException {

        if (args.length == 2) {

            for (;;) {

                throw new UnsupportedOperationException("TODO");

//              BufferedReader in = new BufferedReader(new FileReader(args[0]));

//              PrintWriter out = new PrintWriter(args[1]);

//              new Server(in, out).run();

//              System.out.flush();

//              System.err.flush();

            }

        } else {

            ExecutorService pool = Executors.newCachedThreadPool();

            try

                {

                ServerSocket socket = new ServerSocket(0xcafe, -1, null);

                for (;;) {

                    pool.execute(new Server(socket.accept()));

                }

            }

            catch (IOException e) {

                System.err.format("Error: %s%n", e.getLocalizedMessage());

                pool.shutdown();

            }

        }

    }

    private int compile(OutputStream out, StandardJavaFileManager fm, List<String> args) {

        // FIXME parse args and use getTask

        // System.err.println("Running " + args);

        return tool.run(null, null, out, args.toArray(new String[args.size()]));

    }

}