import { Size } from '@cvmts/shared';
import Piscina from 'piscina';
import sharp from 'sharp';

const kThumbnailSize: Size = {
	width: 400,
	height: 300
};

// this returns appropiate Sharp options to deal with CVMTS raw framebuffers
// (which are RGBA bitmaps, essentially. We probably should abstract that out but
// that'd mean having to introduce that to rfb and oihwekjtgferklds;./tghnredsltg;erhds)
function GetRawSharpOptions(size: Size): sharp.CreateRaw {
	return {
		width: size.width,
		height: size.height,
		channels: 4
	};
}

export default async (opts: any) => {
	let out = await sharp(opts.buffer, { raw: GetRawSharpOptions(opts.size) })
		.resize(kThumbnailSize.width, kThumbnailSize.height, { fit: 'fill' })
		.jpeg({
			quality: opts.quality || 75
		})
		.toFormat('jpeg')
		.toBuffer();

	return Piscina.move(out);
};