import { redirect } from '@sveltejs/kit';
import type { Actions, PageServerLoad } from './$types';
import { listBookSlugs, listTranslationJobs, type TranslationJob } from '$lib/server/pocketbase';
import { backendFetch } from '$lib/server/scraper';
import { log } from '$lib/server/logger';

export const load: PageServerLoad = async ({ locals }) => {
	if (locals.user?.role !== 'admin') {
		redirect(302, '/');
	}

	// Stream jobs — navigation is instant, list populates shortly after.
	const jobs = listTranslationJobs().catch((e): TranslationJob[] => {
		log.warn('admin/translation', 'failed to load translation jobs', { err: String(e) });
		return [];
	});

	// Books list is needed immediately for the enqueue form, but use cache so
	// it's fast on repeat visits.
	const books = await listBookSlugs().catch((e): Awaited<ReturnType<typeof listBookSlugs>> => {
		log.warn('admin/translation', 'failed to load book slugs', { err: String(e) });
		return [];
	});

	return { books, jobs };
};

export const actions: Actions = {
	bulk: async ({ request, locals }) => {
		if (locals.user?.role !== 'admin') {
			return { success: false, error: 'Unauthorized' };
		}

		const form = await request.formData();
		const slug = form.get('slug')?.toString().trim() ?? '';
		const lang = form.get('lang')?.toString().trim() ?? '';
		const from = parseInt(form.get('from')?.toString() ?? '1', 10);
		const to = parseInt(form.get('to')?.toString() ?? '1', 10);

		if (!slug || !lang) {
			return { success: false, error: 'slug and lang are required' };
		}
		if (isNaN(from) || isNaN(to) || from < 1 || to < from) {
			return { success: false, error: 'Invalid chapter range' };
		}

		try {
			const res = await backendFetch('/api/admin/translation/bulk', {
				method: 'POST',
				headers: { 'Content-Type': 'application/json' },
				body: JSON.stringify({ slug, lang, from, to })
			});
			if (!res.ok) {
				const body = await res.text().catch(() => '');
				log.error('admin/translation', 'bulk enqueue failed', { status: res.status, body });
				return { success: false, error: `Backend error ${res.status}: ${body}` };
			}
			const data = await res.json();
			return { success: true, enqueued: data.enqueued as number };
		} catch (e) {
			log.error('admin/translation', 'bulk enqueue fetch error', { err: String(e) });
			return { success: false, error: String(e) };
		}
	}
};