import { NextResponse } from 'next/server';

export const dynamic = 'force-dynamic';

interface SitemapIndex {
	langCode: string;
	filename: string;
}

interface SitemapEntry {
	targetType: string;
	page: number;
	langCode: string;
	filename: string;
	recordCount: number;
}

interface SitemapApiResponse {
	indexes: SitemapIndex[];
	totalFiles: number;
	sitemaps: SitemapEntry[];
}

export async function GET() {
	const gatewayUrl = process.env.PUBLIC_GATEWAY_URL || '';

	try {
		const res = await fetch(`${gatewayUrl}seo-provider/sitemap`);

		if (!res.ok) {
			return new NextResponse(null, { status: res.status });
		}

		const data: SitemapApiResponse = await res.json();

		const locs = data.indexes
			.map((index) => `  <sitemap><loc>${index.filename}</loc></sitemap>`)
			.join('\n');

		const xml = `<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${locs}
</sitemapindex>`;

		return new NextResponse(xml, {
			headers: { 'Content-Type': 'application/xml' }
		});
	} catch {
		return new NextResponse(null, { status: 500 });
	}
}