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

namespace Volian.Base.Library
{
	public static class TmpFile
	{
		public static string CreateFileName(string procNumber, string sectNumber, string sectTitle)
		{
			return FixFileName(procNumber + "_" + ((sectNumber ?? "") != "" ? sectNumber : sectTitle));
		}
		public static string CreateFileName(string procNumber)
		{
			return FixFileName(procNumber);
		}
		public static string FixFileName(string name)
		{
			return Regex.Replace(name, "[ .,/]", "_") + ".pdf";
		}
		public static void RemoveAllTmps()
		{
			RemoveTmpPDFs();
			RemoveTmpDocs();
			RemoveTmps("*.png");
		}
		public static void RemoveTmpPDFs()
		{
			string tmpFolder = VlnSettings.TemporaryFolder;
			DirectoryInfo di = new DirectoryInfo(tmpFolder);
			if (!di.Exists) return;
			foreach (FileInfo fi in di.GetFiles("*.pdf"))
			{
				try
				{
					// only delete pdfs if they are older than an hour - just to be
					// safe.  During creation of pdf's, separate pdfs are created for
					// word sections and imported into the main resulting pdf.
					if (fi.LastAccessTime.Ticks < (DateTime.Now.Ticks - TimeSpan.TicksPerHour))
						fi.Delete();
				}
				catch (Exception ex)
				{
					continue;   // if an error, go onto next file.
				}
			}

		}
		public static void RemoveTmpDocs()
		{
			RemoveTmps("*.doc");
		}

		private static void RemoveTmps(string extension)
		{
			string tmpFolder = VlnSettings.TemporaryFolder;
			DirectoryInfo di = new DirectoryInfo(tmpFolder);
			if (!di.Exists) return;
			foreach (FileInfo fi in di.GetFiles(extension))
			{
				try
				{
					// delete any docs.  If it fails, just go on to the next one becase
					// it may be open from another process.
					fi.Delete();
				}
				catch (Exception ex)
				{
					continue;   // if an error, go onto next file.
				}
			}
		}
	}
}