import { error } from '@sveltejs/kit';
import type { RequestHandler } from './$types';
import { getYouTubeMetadata, streamYouTube } from '$lib/server/ytdlp';

export const GET: RequestHandler = async ({ url }) => {
	// Get query params
	const link = url.searchParams.get('link');
	const format = url.searchParams.get('format'); // mp3, mp4
	const source = url.searchParams.get('source'); // youtube or spotify

	// Validate input
	if (!link || !format || !source) {
		throw error(400, 'Missing required query parameters: link, format, or source');
	}

	if (source !== 'youtube') {
		throw error(400, 'Currently, only YouTube is supported');
	}

	try {
		// Fetch metadata for filename
		const metadata = await getYouTubeMetadata(link);
		const { title, uploader } = metadata;
		const safeTitle = `${uploader} - ${title}`;
		const filename = `${safeTitle}.${format}`;

		console.log(filename);
		// Stream video/audio
		return new Response(streamYouTube(link, format), {
			headers: {
				'Content-Type': format === 'mp3' ? 'audio/mpeg' : 'video/mp4',
				'Content-Disposition': `attachment; filename="${filename}"`
			}
		});
	} catch (err) {
		console.error('Error fetching metadata:', err);
		throw error(500, 'Failed to fetch video metadata');
	}
};