using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using LehrerApp.Core.Interfaces;
using LehrerApp.Core.Models;
using LehrerApp.Core.Services;
using LehrerApp.Data;
using LehrerApp.Desktop.Services;
using LehrerApp.Desktop.ViewModels.Planning;
using LehrerApp.Sync;
using LehrerApp.Sync.Crypto;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Security.Cryptography;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace LehrerApp.Desktop.ViewModels.Settings;

public partial class SettingsViewModel
{
    // ── Kürzel-Katalog (Stundenverlaufsplan, 4.2.2) ──────────────────────────

    [ObservableProperty] private string _newShorthandCode      = "";
    [ObservableProperty] private string _newShorthandLabel     = "";
    [ObservableProperty] private string _newShorthandCodeError = "";

    public ObservableCollection<ShorthandCodeListItem> ShorthandCodes { get; } = [];

    // ── Kürzel-Katalog: Laden / Hinzufügen / Löschen ─────────────────────────

    public void LoadShorthandCodes()
    {
        ShorthandCodes.Clear();
        foreach (var c in _shorthandCodes.GetAll())
            ShorthandCodes.Add(new ShorthandCodeListItem(c));
    }

    [RelayCommand]
    private void AddShorthandCode()
    {
        if (string.IsNullOrWhiteSpace(NewShorthandCode)) { NewShorthandCodeError = "Kürzel erforderlich."; return; }
        try
        {
            _shorthandCodes.Save(new ShorthandCode { Code = NewShorthandCode.Trim(), Label = NewShorthandLabel.Trim() });
        }
        catch (InvalidOperationException ex)
        {
            NewShorthandCodeError = ex.Message;
            return;
        }
        NewShorthandCode = ""; NewShorthandLabel = ""; NewShorthandCodeError = "";
        LoadShorthandCodes();
    }

    [RelayCommand]
    private void DeleteShorthandCode(ShorthandCodeListItem? item)
    {
        if (item is null) return;
        _shorthandCodes.Delete(item.Id);
        LoadShorthandCodes();
    }
}

public class ShorthandCodeListItem(ShorthandCode c)
{
    public Guid   Id    { get; } = c.Id;
    public string Code  { get; } = c.Code;
    public string Label { get; } = c.Label;
}