public async Task <int> Shift()
{
LoggingContext.Current.Info($"Beginning the hour shift...");
LoggingContext.Current.Info($"Shifting all images {(_shiftBackwards ? "backwards" : "forwards")} {_hoursToShift.Hours} hour(s).{Environment.NewLine}");
IEnumerable <string> allPaths = _fileLoader.FindAllPaths();
int pathsCount = allPaths.Count();
LoggingContext.Current.Debug($"Found {pathsCount} files.");
if (allPaths.Count() == 0)
{
LoggingContext.Current.Info($"Didn't find any files to shift.");
return(0);
}
int filesShifted = 0;
foreach (string path in allPaths)
{
// See if the file is an image
try
{
using (Image image = Image.FromFile(path)) { }
}
catch
{
LoggingContext.Current.Debug($"This file doesn't seem to be an image: {path}");
continue;
}
try
{
byte[] originalImageBytes = await _fileLoader.LoadImage(path);
using (MemoryStream memoryStream = new MemoryStream(originalImageBytes))
using (Image image = Image.FromStream(memoryStream, false, false))
{
PropertyItem propertyItem = image.GetPropertyItem(DATE_TAKEN_PROPERTY_ID);
string dateTakenString = _regex.Replace(Encoding.UTF8.GetString(propertyItem.Value), "-", 2);
DateTime dateTaken;
if (!DateTime.TryParse(dateTakenString, out dateTaken))
{
LoggingContext.Current.Warn($"Could not parse the Date/Time {dateTakenString} for image located at {path}.");
continue;
}
LoggingContext.Current.Info($"Shifting Date/Time taken for image {path}...");
long shiftedTicks;
if (_shiftBackwards)
{
shiftedTicks = dateTaken.Ticks - _hoursToShift.Ticks;
}
else
{
shiftedTicks = dateTaken.Ticks + _hoursToShift.Ticks;
}
DateTime shiftedDateTaken = new DateTime(shiftedTicks);
propertyItem.Value = Encoding.UTF8.GetBytes(shiftedDateTaken.ToString(DATE_TAKEN_DATETIME_FORMAT));
image.SetPropertyItem(propertyItem);
image.Save(path, image.RawFormat);
LoggingContext.Current.Info($"The original Date/Time {dateTaken} was shifted to {shiftedDateTaken}.{Environment.NewLine}");
filesShifted++;
}
}
catch (Exception e)
{
LoggingContext.Current.Error($"File located at '{path}' has issues. Skipping this file.");
LoggingContext.Current.Error($"{e.ToString()}{Environment.NewLine}");
}
}
if (filesShifted == 0)
{
LoggingContext.Current.Info($"No images were modified! Either: ");
LoggingContext.Current.Info($"\t1. No images were found in the current directory{(!_options.CurrentDirectoryOnly ? " (including subfolders)" : string.Empty)}");
LoggingContext.Current.Info($" or");
LoggingContext.Current.Info($"\t2. Images were found but errors occurred.{Environment.NewLine}");
LoggingContext.Current.Info($"Run this utility with Debug logging turned on for more information{Environment.NewLine}");
}
return(filesShifted);
}