import { checkRateLimit } from '$lib/rateLimit.js';

export const GET = async (event) => {
	const limit = await checkRateLimit(event);
	const { url } = event;

	if (limit) return limit;

	let status = '';
	let error = false;

	switch (url.searchParams.get('status')) {
		case 'FINISHED':
			{
				status = 'completed';
			}
			break;
		case 'RELEASING':
			{
				status = 'ongoing';
			}
			break;
		case 'HIATUS':
			{
				status = 'hiatus';
			}
			break;
		case 'CANCELLED':
			{
				status = 'cancelled';
			}
			break;
	}

	const nullIfNullString = (s: string | null) => (s == 'null' ? null : s);
	const get = async (title: string) => {
		try {
			return await (
				await fetch(
					`https://api.mangadex.org/manga?title=${encodeURIComponent(
						title
					)}&year=${url.searchParams.get('year')}&status[]=${status}`
				)
			).json();
		} catch {
			error = true;
		}
	};

	let mangadexData = await get(
		nullIfNullString(url.searchParams.get('native')) ||
			nullIfNullString(url.searchParams.get('english')) ||
			nullIfNullString(url.searchParams.get('romaji')) ||
			''
	);

	if (error) return new Response('rate-limited');

	if (mangadexData['data'] === undefined || mangadexData['data'].length === 0) {
		mangadexData = await get(nullIfNullString(url.searchParams.get('english')) || '');

		if (mangadexData['data'] === undefined || mangadexData['data'].length === 0) {
			mangadexData = await get(nullIfNullString(url.searchParams.get('romaji')) || '');
		}
	}

	return Response.json(mangadexData, {
		headers: {
			'Cache-Control': 'max-age=300'
		}
	});
};