import { json, error } from '@sveltejs/kit';
import type { RequestHandler } from './$types';
import { env } from '$env/dynamic/private';
import { log } from '$lib/server/logger';

const SCRAPER_URL = env.SCRAPER_API_URL ?? 'http://localhost:8080';

/**
 * GET /api/browse-page?page=2&genre=all&sort=popular&status=all
 *
 * Thin proxy to the Go scraper's /api/browse endpoint.
 * Used by the infinite-scroll browse page to append subsequent pages
 * without a full SSR navigation.
 */
export const GET: RequestHandler = async ({ url }) => {
	const page = url.searchParams.get('page') ?? '1';
	const genre = url.searchParams.get('genre') ?? 'all';
	const sort = url.searchParams.get('sort') ?? 'popular';
	const status = url.searchParams.get('status') ?? 'all';

	const params = new URLSearchParams({ page, genre, sort, status });
	const apiURL = `${SCRAPER_URL}/api/browse?${params.toString()}`;

	try {
		const res = await fetch(apiURL);
		if (!res.ok) {
			log.error('browse-page', 'scraper returned error', { status: res.status });
			throw error(502, `Browse fetch failed: ${res.status}`);
		}
		const data = await res.json();
		return json(data);
	} catch (e) {
		if (e instanceof Error && 'status' in e) throw e;
		log.error('browse-page', 'network error', { err: String(e) });
		throw error(502, 'Could not reach browse service');
	}
};