/* Copyright (c) Citrix Systems, Inc. 
 * 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. 
 * 
 * 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 HOLDER OR 
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 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 */

using System;
using System.IO;
using System.Linq;
using XenAdmin;

namespace XenModel
{
	public class PathValidator
	{
		private static readonly char[] m_invalidFileCharList = Path.GetInvalidFileNameChars();
		private static readonly string[] m_deviceNames = {
															 "CON", "PRN", "AUX", "NUL",
															 "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
															 "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9"
														 };

		private static string IllegalFileCharMsg {
			get {
				return string.Format(Messages.ILLEGAL_CHARACTER_ERROR_MESSAGE, string.Join(" ", m_invalidFileCharList.Where(c => !char.IsControl(c))));
			}
		}

		private static string IllegalPathCharMsg
        {
            get
            {
				return string.Format(Messages.ILLEGAL_CHARACTER_ERROR_MESSAGE, string.Join(" ", m_invalidFileCharList.Where(c => !char.IsControl(c) && c != '\\')));

			}
        }

		public static bool IsFileNameValid(string filename, out string invalidNameMsg)
		{
			invalidNameMsg = string.Empty;
			if (filename.IndexOfAny(m_invalidFileCharList) > -1)
            {
				invalidNameMsg = IllegalFileCharMsg;
				return false;
            }

			foreach (var name in m_deviceNames)
			{
				if (name == filename.ToUpper())
                {
					invalidNameMsg = Messages.FILE_NAME_IS_DEVICE_NAME_ERROR_MESSAGE;
					return false;
                }
			}

			return true;
		}

		public static bool IsPathValid(string path, out string invalidPathMsg)
		{
			invalidPathMsg = string.Empty;
			if (string.IsNullOrEmpty(path))
            {
				invalidPathMsg = Messages.PATH_CAN_NOT_BE_NULL_ERROR_MESSAGE;
				return false;
            }

			try
			{
				if (Path.IsPathRooted(path))
				{
					path = path[0] == '\\' && path.Length == 1
							? path.Substring(1)
							: path.Substring(2);
				}
			}
			catch (ArgumentException)
			{
				//path contains some of the characters from Path.GetInvalidPathChars()
				invalidPathMsg = IllegalPathCharMsg;
				return false;
			}

            var parts = path.Split('\\');

            if (parts.Length > 0)
            {
                foreach (var part in parts)
                {
                    if (part.IndexOfAny(m_invalidFileCharList) > -1)
                    {
                        invalidPathMsg = IllegalPathCharMsg;
                        return false;
                    }

                    foreach (var name in m_deviceNames)
                    {
                        if (name == part.ToUpper())
                        {
                            invalidPathMsg = string.Format(Messages.FILE_PATH_DEVICE_NAME_ERROR_MESSAGE, name);
                            return false;
                        }
                    }
                }
            }

            return true;
		}
	}
}