/*
 * 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.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.security.AccessController;
import java.security.PrivilegedAction;

class FS_Win32_Cygwin extends FS_Win32 {
	private static String cygpath;

	static boolean detect() {
		final String path = AccessController
				.doPrivileged(new PrivilegedAction<String>() {
					public String run() {
						return System.getProperty("java.library.path");
					}
				});
		if (path == null)
			return false;
		for (final String p : path.split(";")) {
			final File e = new File(p, "cygpath.exe");
			if (e.isFile()) {
				cygpath = e.getAbsolutePath();
				return true;
			}
		}
		return false;
	}

	protected File resolveImpl(final File dir, final String pn) {
		try {
			final Process p;

			p = Runtime.getRuntime().exec(
					new String[] { cygpath, "--windows", "--absolute", pn },
					null, dir);
			p.getOutputStream().close();

			final BufferedReader lineRead = new BufferedReader(
					new InputStreamReader(p.getInputStream(), "UTF-8"));
			String r = null;
			try {
				r = lineRead.readLine();
			} finally {
				lineRead.close();
			}

			for (;;) {
				try {
					if (p.waitFor() == 0 && r != null && r.length() > 0)
						return new File(r);
					break;
				} catch (InterruptedException ie) {
					// Stop bothering me, I have a zombie to reap.
				}
			}
		} catch (IOException ioe) {
			// Fall through and use the default return.
			//
		}
		return super.resolveImpl(dir, pn);
	}

	@Override
	protected File userHomeImpl() {
		final String home = AccessController
				.doPrivileged(new PrivilegedAction<String>() {
					public String run() {
						return System.getenv("HOME");
					}
				});
		if (home == null || home.length() == 0)
			return super.userHomeImpl();
		return resolveImpl(new File("."), home);
	}
}