using Microsoft.Windows.AppNotifications;
using Microsoft.Windows.AppNotifications.Builder;

namespace AmiReel.Services;

/// <summary>Shows a Windows app notification when a Video or Shorts render finishes, fails, or is cancelled.</summary>
public static class RenderNotifier
{
    public static void Register()
    {
        try
        {
            AppNotificationManager.Default.NotificationInvoked -= OnNotificationInvoked;
            AppNotificationManager.Default.NotificationInvoked += OnNotificationInvoked;
            AppNotificationManager.Default.Register();
        }
        catch
        {
            // Notifications are unavailable when the process is elevated or has no identity.
        }
    }

    public static void ShowCompleted(bool shorts) => Show(DescribeCompleted(shorts));

    public static void ShowFailed(string summary) => Show(DescribeFailed(summary));

    public static void ShowCancelled() => Show(DescribeCancelled());

    internal static (string Title, string Body) DescribeCompleted(bool shorts) => shorts
        ? ("Short complete", "The YouTube Short was rendered successfully.")
        : ("Render complete", "The AmiReel render completed successfully.");

    internal static (string Title, string Body) DescribeFailed(string summary)
    {
        string body = string.IsNullOrWhiteSpace(summary)
            ? "The render failed."
            : summary.ReplaceLineEndings(" ");
        if (body.Length > 180)
            body = body[..177] + "...";
        return ("Render failed", body);
    }

    internal static (string Title, string Body) DescribeCancelled() =>
        ("Render cancelled", "The render was cancelled.");

    private static void Show((string Title, string Body) content)
    {
        try
        {
            AppNotification notification = new AppNotificationBuilder()
                .AddText(content.Title)
                .AddText(content.Body)
                .BuildNotification();
            AppNotificationManager.Default.Show(notification);
        }
        catch
        {
            // Show fails silently when notifications are unsupported.
        }
    }

    private static void OnNotificationInvoked(AppNotificationManager sender, AppNotificationActivatedEventArgs args)
    {
        App.MainWindowInstance?.DispatcherQueue.TryEnqueue(() => App.MainWindowInstance.Activate());
    }
}