using Jugenddienst_Stunden.ViewModels;
using Jugenddienst_Stunden.Models;
using CommunityToolkit.Maui.Core;
using CommunityToolkit.Maui.Alerts;

namespace Jugenddienst_Stunden.Views;

/// <summary>
/// Code-Behind für die Stunden-Übersicht
/// </summary>
public partial class StundenPage : ContentPage {
	/// <summary>
	/// CTOR (für Shell/XAML DataTemplate erforderlich)
	/// </summary>
	public StundenPage() : this(
		(Application.Current?.Handler?.MauiContext?.Services
		 ?? throw new InvalidOperationException("DI container ist nicht verfügbar."))
		.GetRequiredService<StundenViewModel>()) {
	}

	/// <summary>
	/// CTOR (DI)
	/// </summary>
	public StundenPage(StundenViewModel vm) {
		InitializeComponent();
		BindingContext = vm;

		vm.AlertEvent += Vm_AlertEvent;
		vm.InfoEvent += Vm_InfoEvent;

		// Navigation NICHT im CTOR ausführen (Shell/Navigation-Stack ist hier oft noch nicht ?ready?)
		// if (!CheckLogin()) {
		// 	NavigateToTargetPage();
		// }
	}

	private void Vm_AlertEvent(object? sender, string e) {
		MainThread.BeginInvokeOnMainThread(async () => { await DisplayAlert("Fehler:", e, "OK"); });
	}

	//private void Vm_InfoEvent(object? sender, string e) {
	//    DisplayAlert("Information:", e, "OK");
	//}
	//private void Vm_InfoEvent(object? sender, string e) {
	//    MainThread.BeginInvokeOnMainThread(async () => {
	//        await DisplayAlert("Information:", e, "OK");
	//    });
	//} 
	private void Vm_InfoEvent(object? sender, string e) {
		MainThread.BeginInvokeOnMainThread(async () => {
			CancellationTokenSource cts = new CancellationTokenSource();
			ToastDuration duration = ToastDuration.Short;
			double fontSize = 16;
			var toast = Toast.Make(e, duration, fontSize);
			await toast.Show(cts.Token);
		});
	}

	/// <summary>
	/// Beim Laden der Seite den Titel setzen
	/// </summary>
	protected override async void OnAppearing() {
		base.OnAppearing();
		Title = Preferences.Default.Get("name", "Nicht") + " " + Preferences.Default.Get("surname", "eingeloggt");

		if (!CheckLogin()) {
			try {
				await NavigateToTargetPage();
			} catch (Exception ex) {
				await DisplayAlert("Fehler:", ex.Message, "OK");
			}
		}
	}

	private bool CheckLogin() {
		return Preferences.Default.Get("apiKey", "") != "";
	}

	// private async void NavigateToTargetPage() {
	// 	await Navigation.PushAsync(new LoginPage());
	// }

	private Task NavigateToTargetPage() {
		// Shell-Navigation statt Navigation.PushAsync
		// Voraussetzung: LoginPage-Route ist in AppShell registriert (Routing.RegisterRoute(...))
		return Shell.Current.GoToAsync(nameof(Views.LoginPage));
	}
}