/*
    * Copyright (C) 2006, Robin Rosenberg <robin.rosenberg@dewire.com>
    * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
    * and other copyright owners as documented in the project's IP log.
    *
    * This program and the accompanying materials are made available
    * under the terms of the Eclipse Distribution License v1.0 which
    * accompanies this distribution, is reproduced below, and is
    * available at http://www.eclipse.org/org/documents/edl-v10.php
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
   *
   * - Redistributions of source code must retain the above copyright
   *   notice, this list of conditions and the following disclaimer.
   *
   * - Redistributions in binary form must reproduce the above
   *   copyright notice, this list of conditions and the following
   *   disclaimer in the documentation and/or other materials provided
   *   with the distribution.
   *
   * - Neither the name of the Eclipse Foundation, Inc. nor the
   *   names of its contributors may be used to endorse or promote
   *   products derived from this software without specific prior
   *   written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package org.eclipse.jgit.pgm;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.lang.reflect.InvocationTargetException;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.text.MessageFormat;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.jgit.awtui.AwtAuthenticator;
  import org.eclipse.jgit.awtui.AwtCredentialsProvider;
  import org.eclipse.jgit.errors.TransportException;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.lib.RepositoryBuilder;
  import org.eclipse.jgit.pgm.internal.CLIText;
  import org.eclipse.jgit.pgm.opt.CmdLineParser;
  import org.eclipse.jgit.pgm.opt.SubcommandHandler;
  import org.eclipse.jgit.util.CachedAuthenticator;
  import org.kohsuke.args4j.Argument;
  import org.kohsuke.args4j.CmdLineException;
  import org.kohsuke.args4j.ExampleMode;
  import org.kohsuke.args4j.Option;
  
  /** Command line entry point. */
  public class Main {
  	@Option(name = "--help", usage = "usage_displayThisHelpText", aliases = { "-h" })
  	private boolean help;
  
  	@Option(name = "--version", usage = "usage_displayVersion")
  	private boolean version;
  
  	@Option(name = "--show-stack-trace", usage = "usage_displayThejavaStackTraceOnExceptions")
  	private boolean showStackTrace;
  
  	@Option(name = "--git-dir", metaVar = "metaVar_gitDir", usage = "usage_setTheGitRepositoryToOperateOn")
  	private String gitdir;
  
  	@Argument(index = 0, metaVar = "metaVar_command", required = true, handler = SubcommandHandler.class)
  	private TextBuiltin subcommand;
  
  	@Argument(index = 1, metaVar = "metaVar_arg")
  	private List<String> arguments = new ArrayList<String>();
  
  	/**
  	 * Execute the command line.
  	 *
  	 * @param argv
  	 *            arguments.
  	 */
  	public static void main(final String[] argv) {
  		new Main().run(argv);
  	}
 
 	/**
 	 * Parse the command line and execute the requested action.
 	 *
 	 * Subclasses should allocate themselves and then invoke this method:
 	 *
 	 * <pre>
 	 * class ExtMain {
 	 * 	public static void main(String[] argv) {
 	 * 		new ExtMain().run(argv);
 	 * 	}
 	 * }
 	 * </pre>
 	 *
 	 * @param argv
 	 *            arguments.
 	 */
 	protected void run(final String[] argv) {
 		try {
 			if (!installConsole()) {
 				AwtAuthenticator.install();
 				AwtCredentialsProvider.install();
 			}
 			configureHttpProxy();
 			execute(argv);
 		} catch (Die err) {
 			if (err.isAborted())
 				System.exit(1);
 			System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
 			if (showStackTrace)
 				err.printStackTrace();
 			System.exit(128);
 		} catch (Exception err) {
 			// Try to detect errno == EPIPE and exit normally if that happens
 			// There may be issues with operating system versions and locale,
 			// but we can probably assume that these messages will not be thrown
 			// under other circumstances.
 			if (err.getClass() == IOException.class) {
 				// Linux, OS X
 				if (err.getMessage().equals("Broken pipe")) //$NON-NLS-1$
 					System.exit(0);
 				// Windows
 				if (err.getMessage().equals("The pipe is being closed")) //$NON-NLS-1$
 					System.exit(0);
 			}
 			if (!showStackTrace && err.getCause() != null
 					&& err instanceof TransportException)
 				System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getCause().getMessage()));
 
 			if (err.getClass().getName().startsWith("org.eclipse.jgit.errors.")) { //$NON-NLS-1$
 				System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
 				if (showStackTrace)
 					err.printStackTrace();
 				System.exit(128);
 			}
 			err.printStackTrace();
 			System.exit(1);
 		}
 		if (System.out.checkError()) {
 			System.err.println(CLIText.get().unknownIoErrorStdout);
 			System.exit(1);
 		}
 		if (System.err.checkError()) {
 			// No idea how to present an error here, most likely disk full or
 			// broken pipe
 			System.exit(1);
 		}
 	}
 
 	private void execute(final String[] argv) throws Exception {
 		final CmdLineParser clp = new CmdLineParser(this);
 		PrintWriter writer = new PrintWriter(System.err);
 		try {
 			clp.parseArgument(argv);
 		} catch (CmdLineException err) {
 			if (argv.length > 0 && !help && !version) {
 				writer.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
 				writer.flush();
 				System.exit(1);
 			}
 		}
 
 		if (argv.length == 0 || help) {
 			final String ex = clp.printExample(ExampleMode.ALL, CLIText.get().resourceBundle());
 			writer.println("jgit" + ex + " command [ARG ...]"); //$NON-NLS-1$ //$NON-NLS-2$
 			if (help) {
 				writer.println();
 				clp.printUsage(writer, CLIText.get().resourceBundle());
 				writer.println();
 			} else if (subcommand == null) {
 				writer.println();
 				writer.println(CLIText.get().mostCommonlyUsedCommandsAre);
 				final CommandRef[] common = CommandCatalog.common();
 				int width = 0;
 				for (final CommandRef c : common)
 					width = Math.max(width, c.getName().length());
 				width += 2;
 
 				for (final CommandRef c : common) {
 					writer.print(' ');
 					writer.print(c.getName());
 					for (int i = c.getName().length(); i < width; i++)
 						writer.print(' ');
 					writer.print(CLIText.get().resourceBundle().getString(c.getUsage()));
 					writer.println();
 				}
 				writer.println();
 			}
 			writer.flush();
 			System.exit(1);
 		}
 
 		if (version) {
 			String cmdId = Version.class.getSimpleName().toLowerCase();
 			subcommand = CommandCatalog.get(cmdId).create();
 		}
 
 		final TextBuiltin cmd = subcommand;
 		if (cmd.requiresRepository())
 			cmd.init(openGitDir(gitdir), null);
 		else
 			cmd.init(null, gitdir);
 		try {
 			cmd.execute(arguments.toArray(new String[arguments.size()]));
 		} finally {
 			if (cmd.outw != null)
 				cmd.outw.flush();
 			if (cmd.errw != null)
 				cmd.errw.flush();
 		}
 	}
 
 	/**
 	 * Evaluate the {@code --git-dir} option and open the repository.
 	 *
 	 * @param aGitdir
 	 *            the {@code --git-dir} option given on the command line. May be
 	 *            null if it was not supplied.
 	 * @return the repository to operate on.
 	 * @throws IOException
 	 *             the repository cannot be opened.
 	 */
 	protected Repository openGitDir(String aGitdir) throws IOException {
 		RepositoryBuilder rb = new RepositoryBuilder() //
 				.setGitDir(aGitdir != null ? new File(aGitdir) : null) //
 				.readEnvironment() //
 				.findGitDir();
 		if (rb.getGitDir() == null)
 			throw new Die(CLIText.get().cantFindGitDirectory);
 		return rb.build();
 	}
 
 	private static boolean installConsole() {
 		try {
 			install("org.eclipse.jgit.console.ConsoleAuthenticator"); //$NON-NLS-1$
 			install("org.eclipse.jgit.console.ConsoleCredentialsProvider"); //$NON-NLS-1$
 			return true;
 		} catch (ClassNotFoundException e) {
 			return false;
 		} catch (NoClassDefFoundError e) {
 			return false;
 		} catch (UnsupportedClassVersionError e) {
 			return false;
 
 		} catch (IllegalArgumentException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		} catch (SecurityException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		} catch (IllegalAccessException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		} catch (InvocationTargetException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		} catch (NoSuchMethodException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		}
 	}
 
 	private static void install(final String name)
 			throws IllegalAccessException, InvocationTargetException,
 			NoSuchMethodException, ClassNotFoundException {
 		try {
 		Class.forName(name).getMethod("install").invoke(null); //$NON-NLS-1$
 		} catch (InvocationTargetException e) {
 			if (e.getCause() instanceof RuntimeException)
 				throw (RuntimeException) e.getCause();
 			if (e.getCause() instanceof Error)
 				throw (Error) e.getCause();
 			throw e;
 		}
 	}
 
 	/**
 	 * Configure the JRE's standard HTTP based on <code>http_proxy</code>.
 	 * <p>
 	 * The popular libcurl library honors the <code>http_proxy</code>,
 	 * <code>https_proxy</code> environment variables as a means of specifying
 	 * an HTTP/S proxy for requests made behind a firewall. This is not natively
 	 * recognized by the JRE, so this method can be used by command line
 	 * utilities to configure the JRE before the first request is sent.
 	 *
 	 * @throws MalformedURLException
 	 *             the value in <code>http_proxy</code> or
 	 *             <code>https_proxy</code> is unsupportable.
 	 */
 	private static void configureHttpProxy() throws MalformedURLException {
 		for (String protocol : new String[] { "http", "https" }) { //$NON-NLS-1$ //$NON-NLS-2$
 			final String s = System.getenv(protocol + "_proxy"); //$NON-NLS-1$
 			if (s == null || s.equals("")) //$NON-NLS-1$
 				return;
 
 			final URL u = new URL(
 					(s.indexOf("://") == -1) ? protocol + "://" + s : s); //$NON-NLS-1$ //$NON-NLS-2$
 			if (!u.getProtocol().startsWith("http")) //$NON-NLS-1$
 				throw new MalformedURLException(MessageFormat.format(
 						CLIText.get().invalidHttpProxyOnlyHttpSupported, s));
 
 			final String proxyHost = u.getHost();
 			final int proxyPort = u.getPort();
 
 			System.setProperty(protocol + ".proxyHost", proxyHost); //$NON-NLS-1$
 			if (proxyPort > 0)
 				System.setProperty(protocol + ".proxyPort", //$NON-NLS-1$
 						String.valueOf(proxyPort));
 
 			final String userpass = u.getUserInfo();
 			if (userpass != null && userpass.contains(":")) { //$NON-NLS-1$
 				final int c = userpass.indexOf(':');
 				final String user = userpass.substring(0, c);
 				final String pass = userpass.substring(c + 1);
 				CachedAuthenticator.add(
 						new CachedAuthenticator.CachedAuthentication(proxyHost,
 								proxyPort, user, pass));
 			}
 		}
 	}
 }