rssotto-csharp-client/ModVersionChecker/repository/filesystem/AppsManager.cs

using ModVersionChecker.managers.interfaces;
using System.Collections.Generic;
using System.IO;
using System.Text.Json;

namespace ModVersionChecker.managers.filesystem
{
    public class AppsManager
    {
        private readonly string FilePath = Path.Combine(AppContext.BaseDirectory, "data", "apps.json");

        public List<App> Load()
        {
            if (!File.Exists(FilePath))
                return new List<App>();
            var json = File.ReadAllText(FilePath);
            return JsonSerializer.Deserialize<List<App>>(json) ?? new();
        }

        public void Save(List<App> apps)
        {
            var options = new JsonSerializerOptions { WriteIndented = true };
            var json = JsonSerializer.Serialize(apps, options);
            File.WriteAllText(FilePath, json);
        }

        public void Upsert(App app)
        {
            var apps = Load();
            var index = apps.FindIndex(a => a.Id == app.Id);
            if (index >= 0)
            {
                apps[index] = app;
            }
            else
            {
                apps.Add(app);
            }
            Save(apps);
        }
    }
}