IBKRTrader/src/IBKRTrader.Core/Settings/SettingsService.cs

using System.Text.Json;
using System.Text.Json.Serialization;

namespace IBKRTrader.Core.Settings;

/// <summary>
/// Lädt und speichert settings.json neben der EXE.
/// Singleton – wird beim App-Start einmalig geladen.
/// </summary>
public class SettingsService
{
    private static readonly string SettingsPath =
        Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "settings.json");

    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        WriteIndented              = true,
        DefaultIgnoreCondition     = JsonIgnoreCondition.Never,
        PropertyNameCaseInsensitive = true
    };

    public AppSettings Settings { get; private set; } = new();

    public void Load()
    {
        if (!File.Exists(SettingsPath))
        {
            Save(); // Defaults auf Disk schreiben
            return;
        }

        try
        {
            var json = File.ReadAllText(SettingsPath);
            Settings = JsonSerializer.Deserialize<AppSettings>(json, JsonOptions) ?? new AppSettings();
        }
        catch
        {
            Settings = new AppSettings();
            Save();
        }
    }

    public void Save()
    {
        var json = JsonSerializer.Serialize(Settings, JsonOptions);
        File.WriteAllText(SettingsPath, json);
    }
}