using System.Text.Json;
using ClawdDotNet.Models;

namespace ClawdDotNet.Services;

public sealed class SettingsManager
{
    private const string SettingsFileName = "Settings.json";

    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        WriteIndented = true,
        ReadCommentHandling = JsonCommentHandling.Skip,
        AllowTrailingCommas = true,
        PropertyNameCaseInsensitive = true
    };

    private readonly string _settingsPath;

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

    public SettingsManager(string? basePath = null)
    {
        var dir = basePath ?? AppDomain.CurrentDomain.BaseDirectory;
        _settingsPath = Path.Combine(dir, SettingsFileName);
    }

    public void Load()
    {
        if (!File.Exists(_settingsPath))
        {
            AppSettings = new AppSettings();
            Save(); // Defaults schreiben
            return;
        }

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

    public void Save()
    {
        try
        {
            var dir = Path.GetDirectoryName(_settingsPath);
            if (!string.IsNullOrEmpty(dir))
                Directory.CreateDirectory(dir);

            var json = JsonSerializer.Serialize(AppSettings, JsonOptions);
            File.WriteAllText(_settingsPath, json);
        }
        catch (Exception ex)
        {
            // Logging ist hier ggf. noch nicht verfügbar – Fallback auf MessageBox
            MessageBox.Show(
                $"Settings konnten nicht gespeichert werden:\n{ex.Message}",
                "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Warning);
        }
    }
}