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()
		{
			// B2017-249 Recover Temporary File And AutoSave support for MSWord
			// Remove temporary Doc Files more than 2 days old so that files with changes can be recoered.
			RemoveOldTmps("*.doc");
			RemoveOldTmps("*.docx");
			RemoveOldTmps("*.rtf");
		}
        private static void RemoveOldTmps(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 because
                    // it may be open from another process.
                    if(fi.LastWriteTimeUtc < DateTime.Now.AddDays(-2.0))
                    fi.Delete();
                }
                catch (Exception ex)
                {
                    continue;   // if an error, go onto next file.
                }
            }
        }

		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 because
					// it may be open from another process.
					fi.Delete();
				}
				catch (Exception ex)
				{
					continue;   // if an error, go onto next file.
				}
			}
		}
	}
}