/***************************************************************************
 *  Error.cs
 *
 *  Copyright (C) 2006-2007 Alan McGovern
 *  Authors:
 *  Alan McGovern (alan.mcgovern@gmail.com)
 ****************************************************************************/

/*  THIS FILE IS LICENSED UNDER THE MIT LICENSE AS OUTLINED IMMEDIATELY BELOW: 
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a
 *  copy of this software and associated documentation files (the "Software"),  
 *  to deal in the Software without restriction, including without limitation  
 *  the rights to use, copy, modify, merge, publish, distribute, sublicense,  
 *  and/or sell copies of the Software, and to permit persons to whom the  
 *  Software is furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in 
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 *  DEALINGS IN THE SOFTWARE.
 */

using System;
using System.Runtime.InteropServices;

namespace Mtp
{
	public class LibMtpException : Exception
	{
		public LibMtpException (ErrorCode error) : this (error, error.ToString (), null)
		{
		}
		
		public LibMtpException (ErrorCode error, string message) : this (error, message, null)
		{
		
		}
		
		public LibMtpException (ErrorCode error, string message, Exception innerException)
			: base (message, innerException)
		{
		}
		
		internal static void CheckErrorStack (MtpDeviceHandle handle)
		{
			IntPtr ptr = MtpDevice.GetErrorStack (handle);
			if (ptr == IntPtr.Zero)
				return;
			
			LibMtpException ex = null;
			while (ptr != IntPtr.Zero) {
				Error e = (Error)Marshal.PtrToStructure (ptr, typeof(Error));
				ex = new LibMtpException (e.errornumber, e.error_text, ex);
				ptr = e.next;
			}
			
			// Once we throw the exception, clear the error stack
			MtpDevice.ClearErrorStack (handle);
			throw ex;
		}
	}
	
	public struct Error
	{
		public ErrorCode errornumber;
		[MarshalAs(UnmanagedType.LPStr)] public string error_text;
		public IntPtr next; // LIBMTP_error_t*
		
		public static void CheckError (ErrorCode errorCode)
		{
			if (errorCode != ErrorCode.None) {
				throw new LibMtpException (errorCode, errorCode.ToString ());
            }
		}
	}
}
