using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

namespace back.services.ImageResizer;

public sealed class ImageResizer : IImageResizer
{
    public async Task<Stream> ResizeImage(IFormFile image, int maxRes)
    {
        if (image == null || image.Length == 0)
        {
            throw new ArgumentException("Invalid image file.");
        }
        using var inputStream = image.OpenReadStream();
        using var outputStream = new MemoryStream();
        using var img = Image.Load(inputStream);

        img.Mutate(x => x.Resize(new ResizeOptions { Size = new Size(maxRes, 0), Mode = ResizeMode.Max }));
        await img.SaveAsWebpAsync(outputStream);
        outputStream.Position = 0;
        return outputStream;
    }
}