import { error, type RequestHandler } from '@sveltejs/kit';
import prisma from '$lib/server/prisma';
import fs from 'fs';
import path from 'path';

export const GET: RequestHandler = async ({ params, locals }) => {
	const productId = Number(params.id);
	const docId = Number(params.docId);
	if (Number.isNaN(productId) || Number.isNaN(docId)) throw error(400, 'Invalid params');

	const product = await prisma.product.findUnique({ where: { id: productId, isPublished: true } });
	if (!product) throw error(404, 'Product not found');

	const doc = await prisma.productDocument.findFirst({
		where: { id: docId, productId, isPublished: true }
	});
	if (!doc) throw error(404, 'Document not found');

	if (!locals.isSubscribed && !(await import('$lib/server/auth')).default.isAdmin(locals.user)) {
		throw error(403, 'Subscription required');
	}

	const filePath = path.join('uploads', 'product-documents', String(productId), doc.storedName);
	if (!fs.existsSync(filePath)) throw error(404, 'File missing');

	const stat = fs.statSync(filePath);
	const stream = fs.createReadStream(filePath);
	return new Response(stream as any, {
		headers: {
			'Content-Type': 'application/pdf',
			'Content-Length': String(stat.size),
			'Content-Disposition': `inline; filename="${doc.originalName.replace(/"/g, '')}"`,
			'Cache-Control': 'no-store'
		}
	});
};