using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using LehrerApp.Data;

namespace LehrerApp.Desktop.ViewModels;

/// <summary>
/// Passwort-Abfrage beim Programmstart, wenn die Datenbank verschlüsselt ist (13.3.4).
/// Läuft vor <see cref="AppBootstrapper.BuildServices"/>, deshalb ohne DI.
/// </summary>
public partial class DbPasswordPromptViewModel : ObservableObject
{
    private readonly DatabaseEncryptionService _dbEncryption;
    private readonly string _dbPath;

    [ObservableProperty] private string _password = "";
    [ObservableProperty] private string _error = "";

    public Action<string>? OnUnlocked { get; set; }

    public DbPasswordPromptViewModel(DatabaseEncryptionService dbEncryption, string dbPath)
    {
        _dbEncryption = dbEncryption;
        _dbPath = dbPath;
    }

    [RelayCommand]
    private void Unlock()
    {
        if (string.IsNullOrEmpty(Password)) { Error = "Bitte Passwort eingeben."; return; }
        if (!_dbEncryption.VerifyPassword(_dbPath, Password))
        {
            Error = "Falsches Passwort.";
            Password = "";
            return;
        }
        OnUnlocked?.Invoke(Password);
    }
}