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 ConfigPath => Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "settings.json");

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

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