/*
 * Copyright (C) 2007 Eskil Bylund
 *
 * This program 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.
 * 
 * This program 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

using System;
using System.Globalization;
using System.IO;
using System.Text;

namespace DCSharp
{
	/// <summary>
	/// Helper methods for working with strings.
	/// </summary>
	public static class StringUtil
	{
		public static bool MatchesKeywords(string text, string[] keywords)
		{
			CultureInfo culture = CultureInfo.CurrentCulture;
			foreach (string keyword in keywords)
			{
				if (culture.CompareInfo.IndexOf(text, keyword,
					CompareOptions.IgnoreCase) < 0)
				{
					return false;
				}
			}
			return true;
		}

		public static Encoding TryGetEncoding(string encoding)
		{
			try
			{
				return Encoding.GetEncoding(encoding);
			}
			catch
			{
			}
			return null;
		}

		#region Path

		private static char[] PathSeparatorChars = new char []
		{
			Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar, '\\', '/'
		};

		public static string GetDirectoryName(string path)
		{
			int index = path.LastIndexOfAny(PathSeparatorChars);
			if (index > 0)
			{
				return path.Substring(0, index);
			}
			return path;
		}

		public static string GetFileName(string path)
		{
			int index = path.LastIndexOfAny(PathSeparatorChars);
			if (index > 0)
			{
				return path.Substring(index + 1);
			}
			return path;
		}

		#endregion

		#region Uri

		public static Uri CreateUri(string uriString)
		{
			Uri uri;
			if (TryCreateUri(uriString, out uri))
			{
				return uri;
			}
			throw new UriFormatException();
		}

		public static bool TryCreateUri(string uriString, out Uri uri)
		{
			if (!uriString.StartsWith("dchub://"))
			{
				uriString = "dchub://" + uriString;
			}
			return Uri.TryCreate(uriString, UriKind.Absolute, out uri);
		}

		#endregion
	}
}