Jugenddienst-Stunden/Jugenddienst Stunden/Views/LoginPage.xaml.cs

using Jugenddienst_Stunden.Models;
using ZXing.Net.Maui;

namespace Jugenddienst_Stunden.Views;

/// <summary>
/// Die Loginseite mit dem Barcodescanner
/// </summary>
public partial class LoginPage : ContentPage {

	private DateTime _lastDetectionTime;
	private readonly TimeSpan _detectionInterval = TimeSpan.FromSeconds(5);

	internal HoursBase HoursBase = new HoursBase();

    /// <summary>
    /// CTOR
    /// </summary>
    public LoginPage() {
		InitializeComponent();

		//if (BindingContext is LoginViewModel vm) {
		//	vm.AlertEvent += Vm_AlertEvent;
		//	vm.InfoEvent += Vm_InfoEvent;
		//	vm.MsgEvent += Vm_MsgEvent;
		//}

		barcodeScannerView.Options = new BarcodeReaderOptions {
			Formats = BarcodeFormat.QrCode,
			AutoRotate = true,
			Multiple = false
		};

	}



	private void BarcodesDetected(object sender, BarcodeDetectionEventArgs e) {

		var currentTime = DateTime.Now;
		if ((currentTime - _lastDetectionTime) > _detectionInterval) {
			_lastDetectionTime = currentTime;
			foreach (var barcode in e.Results) {
				if (HoursBase.apiKey != barcode.Value) {
					_ = MainThread.InvokeOnMainThreadAsync(async () => {
						//await DisplayAlert("Barcode erkannt", $"Barcode: {barcode.Format} - {barcode.Value}", "OK");

						try {
							var tokendata = new TokenData(barcode.Value);
							HoursBase.tokendata = tokendata;

                            var op = await HoursBase.LoadOperator(barcode.Value);
							HoursBase.apiKey = barcode.Value;
							HoursBase.name = op.name;
							HoursBase.surname = op.surname;
							HoursBase.EmployeeId = int.Parse(op.id);
							Title = op.name + " " + op.surname;
							ServerLabel.Text = "Server: " + tokendata.Url.Replace("/appapi", "").Replace("https://", "").Replace("http://", "");

							Preferences.Default.Set("apiKey", barcode.Value);
							Preferences.Default.Set("name", op.name);
							Preferences.Default.Set("surname", op.surname);
							Preferences.Default.Set("EmployeeId", int.Parse(op.id));

							await DisplayAlert("Login erfolgreich", op.name + " " + op.surname, "OK");
							if (Navigation.NavigationStack.Count > 1)
								await Navigation.PopAsync();
						} catch (Exception e) {
							await DisplayAlert("Fehler", e.Message, "OK");
						}

					});
				} else {
					MainThread.InvokeOnMainThreadAsync(() => {
						DisplayAlert("Bereits eingeloggt",
							Preferences.Default.Get("name", "") + " " + Preferences.Default.Get("surname", ""),
							"OK");
					});
				}
			}
		}

	}

	protected override void OnDisappearing() {
		base.OnDisappearing();

		barcodeScannerView.CameraLocation = CameraLocation.Front;
		barcodeScannerView.IsDetecting = false;

	}

	protected override void OnAppearing() {
		base.OnAppearing();

		barcodeScannerView.IsDetecting = true;
		barcodeScannerView.CameraLocation = CameraLocation.Rear;

	}

	public bool IsCameraAvailable() {
		var status = Permissions.CheckStatusAsync<Permissions.Camera>().Result;
		if (status != PermissionStatus.Granted) {
			status = Permissions.RequestAsync<Permissions.Camera>().Result;
		}
		return status != PermissionStatus.Granted;
	}

	private async void OnLoginButtonClicked(object sender, EventArgs e) {
		var username = UsernameEntry.Text;
		var password = PasswordEntry.Text;
		var server = ServerEntry.Text;

		if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(server)) {
			await DisplayAlert("Fehler", "Bitte alle Felder ausf<73>llen", "OK");
			return;
		}
		try {
			Types.User response = await BaseFunc.AuthUserPass(username, password, server);

			var tokendata = new TokenData(response.Token);
			var op = await HoursBase.LoadOperator(response.Token);
			HoursBase.apiKey = response.Token;
			HoursBase.name = op.name;
			HoursBase.surname = op.surname;
			HoursBase.EmployeeId = int.Parse(op.id);
			Title = op.name + " " + op.surname;
			ServerLabel.Text = "Server: " + tokendata.Url.Replace("/appapi", "").Replace("https://", "").Replace("http://", "");

			Preferences.Default.Set("apiKey", response.Token);
			Preferences.Default.Set("name", op.name);
			Preferences.Default.Set("surname", op.surname);
			Preferences.Default.Set("EmployeeId", int.Parse(op.id));

			await DisplayAlert("Login erfolgreich", op.name + " " + op.surname, "OK");
			if (Navigation.NavigationStack.Count > 1)
				await Navigation.PopAsync();
		} catch (Exception ex) {
			await DisplayAlert("Fehler", ex.Message, "OK");
		}
	}

	//private void Vm_AlertEvent(object? sender, string e) {
	//	DisplayAlert("Fehler:", e, "OK");
	//}
	//private void Vm_InfoEvent(object? sender, string e) {
	//	DisplayAlert("Information:", e, "OK");
	//}
	//private async Task Vm_MsgEvent(string title, string message) {
	//	await DisplayAlert(title, message, "OK");
	//}
}