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

using Jugenddienst_Stunden.Models;
using Jugenddienst_Stunden.Types;
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);


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

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

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

        //Zwischen manuellem und automatischem Login (mit QR-Code) umschalten und die Schalterstellung merken
        bool sqr = true;
        bool sma = false;
        if (Preferences.Default.Get("logintype", "") == "manual") {
            sqr = false;
            sma = true;
            LoginSwitch.IsToggled = true;
            Message.IsVisible = false;
        } else {
            LoginSwitch.IsToggled = false;
            Message.IsVisible = true;
        }
        LoginQR.IsVisible = sqr;
        LoginManual.IsVisible = sma;
    }


    /// <summary>
    /// Nach der Erkennung des Barcodes wird der Benutzer eingeloggt
    /// ZXing.Net.Maui.Controls 0.4.4
    /// </summary>
    private void BarcodesDetected(object sender, BarcodeDetectionEventArgs e) {

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

                        try {
                            var tokendata = new TokenData(barcode.Value);
                            GlobalVar.ApiUrl = tokendata.Url;
                            User user = await HoursBase.LoadUser(barcode.Value);

                            GlobalVar.ApiKey = barcode.Value;
                            GlobalVar.Name = user.Name;
                            GlobalVar.Surname = user.Surname;
                            GlobalVar.EmployeeId = user.Id;

                            Title = user.Name + " " + user.Surname;
                            //Auf der Loginseite wird der Server als Info ohne Protokoll und ohne /appapi angezeigt
                            ServerLabel.Text = "Server: " + tokendata.Url.Replace("/appapi", "").Replace("https://", "").Replace("http://", "");


                            await DisplayAlert("Login erfolgreich", user.Name + " " + user.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);

            GlobalVar.ApiKey = response.Token;
            GlobalVar.Name = response.Name;
            GlobalVar.Surname = response.Surname;
            GlobalVar.EmployeeId = response.Id;
            GlobalVar.ApiUrl = server;

            Title = response.Name + " " + response.Surname;
            ServerLabel.Text = "Server: " + server.Replace("/appapi", "").Replace("https://", "").Replace("http://", "");

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

    //Zwischen manuellem und automatischem Login (mit QR-Code) umschalten und die Schalterstellung merken
    private void Switch_Toggled(object sender, ToggledEventArgs e) {
        var switcher = (Switch)sender;

        if (switcher.IsToggled) {
            LoginQR.IsVisible = false;
            LoginManual.IsVisible = true;
            Message.IsVisible = false;
            Preferences.Default.Set("logintype", "manual");
        } else {
            LoginQR.IsVisible = true;
            LoginManual.IsVisible = false;
            Message.IsVisible = true;
            Preferences.Default.Set("logintype", "qr");
        }

    }

    //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");
    //}
}