ReSync/BackEnd/Logger.cs

using System.Collections.ObjectModel;
using System.IO;

namespace ReSync
{
    public class Logger
    {
        private readonly string _logFilePath;
        public ObservableCollection<LogEntry> Entries { get; } = new();

        public Logger(string logFilePath)
        {
            _logFilePath = logFilePath;
            Directory.CreateDirectory(Path.GetDirectoryName(logFilePath)!);
        }

        public void Log(string message, string level = "Info")
        {
            var entry = new LogEntry { Message = message, Level = level };
            App.Current.Dispatcher.Invoke(() => Entries.Add(entry)); // update UI safely

            var line = $"{entry.Timestamp:yyyy-MM-dd HH:mm:ss} [{entry.Level}] {entry.Message}";
            File.AppendAllText(_logFilePath, line + Environment.NewLine);
        }

        public void Clear()
        {
            Entries.Clear();
            File.WriteAllText(_logFilePath, "");
        }
    }

    public class LogEntry
    {
        public DateTime Timestamp { get; set; } = DateTime.Now;
        public string Level { get; set; } = "Info";
        public string Message { get; set; } = "";
    }
}