/* 
 
Copyright 2006 Rene Grothmann, modified by Eric Hakenholz

This file is part of C.a.R. software.

    C.a.R. is a 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, version 3 of the License.

    C.a.R. 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 for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 */
 
 
 package rene.util;

import java.io.File;

/**
 * This is a static class to determine extensions etc. from a file name.
 */

public class FileName {
	static public int ChopLength = 48;

	static public String purefilename(final String filename) {
		final char a[] = filename.toCharArray();
		int i = a.length - 1;
		final char fs = File.separatorChar;
		while (i >= 0) {
			if (a[i] == fs || a[i] == '/' || i == 0) {
				if (i == 0)
					i = -1;
				if (i < a.length - 1) {
					int j = a.length - 1;
					while (j > i && a[j] != '.')
						j--;
					if (j > i + 1)
						return new String(a, i + 1, j - i - 1);
					else
						return "";
				} else
					return "";
			}
			i--;
		}
		return filename;
	}

	static public String path(final String filename) {
		final char a[] = filename.toCharArray();
		int i = a.length - 1;
		final char fs = File.separatorChar;
		while (i > 0) {
			if (a[i] == fs || a[i] == '/') {
				return new String(a, 0, i);
			}
			i--;
		}
		return "";
	}

	static public String pathAndSeparator(final String filename) {
		final char a[] = filename.toCharArray();
		int i = a.length - 1;
		final char fs = File.separatorChar;
		while (i > 0) {
			if (a[i] == fs || a[i] == '/') {
				return new String(a, 0, i + 1);
			}
			i--;
		}
		return "";
	}

	static public String filename(final String filename) {
		final char a[] = filename.toCharArray();
		int i = a.length - 1;
		final char fs = File.separatorChar;
		while (i > 0) {
			if (a[i] == fs || a[i] == '/') {
				if (i + 1 < a.length)
					return new String(a, i + 1, a.length - i - 1);
				else
					return "";
			}
			i--;
		}
		return filename;
	}

	static public String extension(final String filename) {
		final char a[] = filename.toCharArray();
		int i = a.length - 1;
		final char fs = File.separatorChar;
		while (i > 0) {
			if (a[i] == '.') {
				if (i + 1 < a.length)
					return new String(a, i + 1, a.length - i - 1);
				else
					return "";
			}
			if (a[i] == fs || a[i] == '/')
				break;
			i--;
		}
		return "";
	}

	static public String chop(String filename, final int chop)
	// chop the filename to 32 characters
	{
		if (filename.length() > chop) {
			filename = "... " + filename.substring(filename.length() - chop);
		}
		return filename;
	}

	static public String chop(final String filename) {
		return chop(filename, ChopLength);
	}

	static public String chop(final int start, String filename, final int chop)
	// chop the filename.substring(start) to 32 characters
	{
		if (filename.length() > start + chop) {
			filename = filename.substring(0, start) + " ... "
			+ filename.substring(filename.length() - chop);
		}
		return filename;
	}

	static public String chop(final int start, final String filename) {
		return chop(start, filename, ChopLength);
	}

	static public String relative(String dir, final String filename) {
		dir = dir + System.getProperty("file.separator");
		if (filename.startsWith(dir)) {
			return filename.substring(dir.length());
		} else
			return filename;
	}

	static public String canonical(final String filename) {
		final File f = new File(filename);
		try {
			String s = f.getCanonicalPath();
			if (s.length() > 2 && s.charAt(1) == ':')
				s = s.substring(0, 2).toLowerCase() + s.substring(2);
			return s;
		} catch (final Exception e) {
			return f.getAbsolutePath();
		}
	}

	static public String toURL(final String filename) {
		final int n = filename.indexOf(' ');
		if (n >= 0)
			return filename.substring(0, n) + "%20"
			+ toURL(filename.substring(n + 1));
		else
			return filename;
	}

	static boolean match(final char filename[], final int n,
			final char filter[], final int m) {
		if (filter == null)
			return true;
		if (m >= filter.length)
			return n >= filename.length;
			if (n >= filename.length)
				return m == filter.length - 1 && filter[m] == '*';
			if (filter[m] == '?') {
				return match(filename, n + 1, filter, m + 1);
			}
			if (filter[m] == '*') {
				if (m == filter.length - 1)
					return true;
				for (int i = n; i < filename.length; i++) {
					if (match(filename, i, filter, m + 1))
						return true;
				}
				return false;
			}
			if (filter[m] == filename[n])
				return match(filename, n + 1, filter, m + 1);
			return false;
	}

	public static boolean match(final String filename, final String filter) {
		final char fn[] = filename.toCharArray(), f[] = filter.toCharArray();
		return match(fn, 0, f, 0);
	}

	public static void main(final String args[]) {
		System.out.println("-" + toURL(" test test test ") + "-");
	}
}