using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Tools;
using System.IO;

using ImageMagick;

namespace ndview
{
    public class ThumbnailGenerator
    {
	public readonly int Width,Height;
	public ThumbnailGenerator(int width) : this(width,0){}
	public ThumbnailGenerator(int width, int height)
	{
	    (Width, Height) = (width, height);
	}

	public Task Thumbnail(Stream from, Stream to, CancellationToken token=default)
	    => Task.Run(()=> {
		using var image= new MagickImage();
		image.Read(from);
		token.ThrowIfCancellationRequested();
		image.Resize(200, 0);

		token.ThrowIfCancellationRequested();
		image.Write(to);
		token.ThrowIfCancellationRequested();
	    
	    });
    }
}