/**
 * POST /api/scrape
 *
 * Proxies scrape requests to the Go scraper backend.
 * Admin-only — returns 403 if the authenticated user is not an admin.
 *
 * Request body (JSON):
 *   { "url": "https://novelfire.net/book/..." }  — scrape a single book
 *   {}                                            — scrape the full catalogue
 *
 * Responses mirror the Go scraper:
 *   202  Accepted   — job enqueued
 *   409  Conflict   — a scrape job is already running
 *   400  Bad Request
 *   403  Forbidden  — not an admin
 */

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';

export const POST: RequestHandler = async ({ request, locals }) => {
	// Admin guard
	if (!locals.user || locals.user.role !== 'admin') {
		throw error(403, 'Forbidden');
	}

	let body: { url?: string } = {};
	try {
		body = await request.json();
	} catch {
		// empty body is fine — means "scrape all"
	}

	// Decide which scraper endpoint to call
	const isBookScrape = typeof body.url === 'string' && body.url.length > 0;
	const endpoint = isBookScrape ? '/scrape/book' : '/scrape';

	const upstream = `${SCRAPER_URL}${endpoint}`;
	let res: Response;
	try {
		res = await fetch(upstream, {
			method: 'POST',
			headers: { 'Content-Type': 'application/json' },
			body: isBookScrape ? JSON.stringify({ url: body.url }) : undefined
		});
	} catch (e) {
		log.error('scrape', 'scraper proxy network error', { endpoint, err: String(e) });
		throw error(502, 'Could not reach scraper');
	}

	if (!res.ok && res.status >= 500) {
		const text = await res.text().catch(() => '');
		log.error('scrape', 'scraper returned error', { endpoint, status: res.status, body: text });
	}

	const data = await res.json().catch(() => ({}));

	// Pass through the status code from the Go scraper (202, 409, 400, …)
	return json(data, { status: res.status });
};