using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace VEPROMS.CSLA.Library
{
	public partial class DocumentInfo
	{
		public string DocumentTitle
		{
			get
			{
				if (_LibTitle == "") return string.Format("Document {0}", _DocID);
				return _LibTitle;
			}
		}
	}
	public class DSOFile : IDisposable
	{
		private static readonly log4net.ILog _MyLog = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
		#region Fields
		private bool _IsDisposed;
		private static string _TemporaryFolder = null;
		private DocumentInfo _MyDocument = null;
		private FileInfo _MyFile = null;
		private string _Extension = "DOC";
		#endregion
		#region Properties
		public static string TemporaryFolder
		{
			get
			{
				if (_TemporaryFolder == null)
				{
					_TemporaryFolder = string.Format(@"C:\Documents and Settings\{0}\Local Settings\Temp", Environment.UserName);
					if (!Directory.Exists(TemporaryFolder)) Directory.CreateDirectory(TemporaryFolder);
					_TemporaryFolder += @"\VE-PROMS";
					if (!Directory.Exists(TemporaryFolder)) Directory.CreateDirectory(TemporaryFolder);
				}
				return _TemporaryFolder;
			}
		}
		public DocumentInfo MyDocument
		{
			get { return _MyDocument; }
			set
			{
				TryDelete();
				_MyDocument = value;
				CreateFile();
			}
		}
		public FileInfo MyFile
		{
			get { return _MyFile; }
		}
		public string Extension
		{
			get { return _Extension; }
			set { _Extension = value; }
		}
		#endregion
		#region Private Methods
		private void TryDelete()
		{
			if (_MyDocument == null) return;
			if (_MyFile == null) return;
			if (_MyFile.Exists)
			{
				try
				{
					_MyFile.Delete();
				}
				catch (IOException ex)
				{
					_MyLog.Error("TryDelete",ex);
				}
				finally
				{
					_MyFile = null;
					_MyDocument = null;
				}
			}
		}
		private void CreateFile()
		{
			if (_MyDocument == null) return;
			_MyFile = new FileInfo(string.Format(@"{0}\tmp_{1}." + Extension , TemporaryFolder, MyDocument.DocID));
			FileStream fs = _MyFile.Create();
			fs.Write(MyDocument.DocContent, 0, MyDocument.DocContent.Length);
			fs.Close();
			_MyFile.CreationTime = _MyDocument.DTS;
			_MyFile.LastWriteTime = _MyDocument.DTS;
		}
		public void SaveFile()
		{
			// TODO: Add Try & Catch logic
			if (_MyDocument == null) return;
			Document doc = _MyDocument.Get();
			FileStream fs = _MyFile.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
			Byte[] buf = new byte[_MyFile.Length];
			fs.Read(buf,0,buf.Length);
			fs.Close();
			doc.DocContent = buf;
			doc.UserID = Environment.UserName;
			doc.DTS = _MyFile.LastWriteTime;
			doc.Save();
		}
		#endregion
		#region Constructors
		public DSOFile(DocumentInfo myDocument)
		{
			MyDocument = myDocument;
		}
		#endregion
		#region Destructor
		~DSOFile()
		{
			Dispose(false);
		}
		public void Dispose()
		{
			Dispose(false);
			GC.SuppressFinalize(this);
		}

		protected void Dispose(bool disposing)
		{
			if (!_IsDisposed)
			{
				_IsDisposed = true;
				TryDelete();
			}
		}
		#endregion
	}
}