using Avalonia.Media;
using Avalonia.Media.Imaging;
using Avalonia.Threading;

using CommunityToolkit.Mvvm.ComponentModel;

namespace GSS2.UI.Core.ViewModels;

public partial class AsyncImageRecordViewModel : ViewModelBase
{
    private static readonly SemaphoreSlim _semaphore = new(1, 1);

    [ObservableProperty] public partial string Path { get; set; }
    [ObservableProperty] public partial IImage? Image { get; set; }
    [ObservableProperty] public partial bool IsLoading { get; set; } = true;

    public AsyncImageRecordViewModel(string path)
    {
        Path = path;
    }

    partial void OnPathChanged(string value) => _ = LoadAsync();

    private async Task LoadAsync()
    {
        await _semaphore.WaitAsync();

        try
        {
            var bitmap = await Task.Run(() => new Bitmap(Path));

            await Dispatcher.UIThread.InvokeAsync(() =>
            {
                Image = bitmap;
                IsLoading = false;
            });
        }
        catch (Exception ex)
        {
            Console.Error.WriteLine($"Ошибка во время загрузки изображения:\n{ex.Message}\n{ex.StackTrace}");
            await Dispatcher.UIThread.InvokeAsync(() => IsLoading = false);
        }
        finally
        {
            _semaphore.Release();
        }
    }
}