namespace DynamicBinaryStream.Results;

using System.Drawing;
using Microsoft.AspNetCore.Mvc;

public class AnimationResult : IActionResult
{
    IAsyncEnumerable<Bitmap> _frames;

    public AnimationResult(IAsyncEnumerable<Bitmap> frames)
    {
        _frames = frames;
    }

    public async Task ExecuteResultAsync(ActionContext context)
    {
        context.HttpContext.Response.ContentType = "image/gif";

        using (var encoder = new AnimatedGif.AnimatedGifCreator(context.HttpContext.Response.Body, delay: 20))
        {
            await foreach (var frame in _frames.WithCancellation(context.HttpContext.RequestAborted))
            {
                using (frame)
                {
                    await encoder.AddFrameAsync(frame, cancellationToken: context.HttpContext.RequestAborted);
                }
            }
        }
    }
}