TimerApp/AppSettings.cs

using System;
using System.IO;
using System.Text.Json;

namespace TimerApp
{
    public class AppSettings
    {
        public int WorkMinutes { get; set; } = 20;
        public int RestMinutes { get; set; } = 1;
        public int IdleThresholdSeconds { get; set; } = 30;
        public bool IsDarkMode { get; set; } = true;

        private static string LegacyConfigPath => Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "settings.json");

        private static string ConfigPath
        {
            get
            {
                string dir = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "TimerApp");
                return Path.Combine(dir, "settings.json");
            }
        }

        public static AppSettings Load()
        {
            try
            {
                string path = File.Exists(ConfigPath) ? ConfigPath : LegacyConfigPath;
                if (File.Exists(path))
                {
                    string json = File.ReadAllText(path);
                    return JsonSerializer.Deserialize<AppSettings>(json) ?? new AppSettings();
                }
            }
            catch
            {
                // ignore errors, return default
            }
            return new AppSettings();
        }

        public void Save()
        {
            try
            {
                Directory.CreateDirectory(Path.GetDirectoryName(ConfigPath)!);
                string json = JsonSerializer.Serialize(this, new JsonSerializerOptions { WriteIndented = true });
                File.WriteAllText(ConfigPath, json);
            }
            catch
            {
                // ignore
            }
        }
    }
}