using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PEP_Tool
{
    public static class Writer
    {
        static int errCount = 0;
        static bool ready = true;

        public static async Task<FileStream> WaitForFile(string fullPath, FileMode mode, FileAccess access, FileShare share)
        {
                ready = false;

                var err = false;
                FileStream fs = null;

                var r = new Random();

                for (int numTries = 0; numTries < 50; numTries++)
                {
                    fs = null;
                    try
                    {
                        await Task.Delay(r.Next(5, 100));


                        if (err && errCount > 20)
                        {
                            LogFile.WriteLine(access.ToString() + "error #" + errCount + ": " + Path.GetFileName(fullPath));
                            await Task.Delay(r.Next(200, 1000));
                        }

                        fs = new FileStream(fullPath, mode, access, share);

                        if (err && errCount > 20) LogFile.WriteLine(access.ToString() + " done" + ": " + Path.GetFileName(fullPath));

                        err = false;

                        errCount = 0;
                        ready = true;
                        return fs;
                    }
                    catch (IOException ex)
                    {
                        await Task.Delay(r.Next(5, 100));
                        errCount++;
                        System.Diagnostics.Debug.WriteLine("Writer_IOException: " + DateTime.Now.TimeOfDay);
                        //LogFile.WriteLine($"{Environment.MachineName}: {access.ToString()} denied: {Path.GetFileName(fullPath)}\n\nDies ist das {errCount}. vorkommen\n\n");
                        //LogFile.WriteLine(ex.ToString());
                        //LogFile.WriteLine("Message: " + ex.Message);
                        //if(ex.InnerException != null) LogFile.WriteLine("InnerException: " + ex.InnerException);
                        err = true;
                        if (fs != null)
                        {
                            fs.Dispose();
                        }

                        await Task.Delay(r.Next(200, 500));

                        ready = true;
                    }
                    catch (Exception exc)
                    {
                        //LogFile.WriteLine(Environment.MachineName + ": " + access.ToString() + " denied" + ": " + Path.GetFileName(fullPath));
                        //LogFile.WriteLine(exc.ToString());
                        //LogFile.WriteLine("Message: " + exc.Message);
                        //if (exc.InnerException != null) LogFile.WriteLine("InnerException: " + exc.InnerException);
                        err = true;
                        if (fs != null)
                        {
                            fs.Dispose();
                        }
                        await Task.Delay(r.Next(200, 500));

                        ready = true;
                    }

                }

                //fs.Dispose();
                if (err) System.Windows.MessageBox.Show("Daten konnten nicht geschrieben werden!\nBitte erneut versuchen\n\nWenn dieser Fehler mehrmals direkt hintereinander auftritt, bitte an Marcus Bachler wenden.", "Fehler", System.Windows.MessageBoxButton.OK, System.Windows.MessageBoxImage.Warning, System.Windows.MessageBoxResult.OK);

                ready = true;
                return null;
            
        }
    }
}