const MAX_URL_CHARS = 8_000;
const MANA_SEARCH_URL = process.env.MANA_SEARCH_URL ?? 'http://localhost:3076';

export async function fetchUrlContent(url: string): Promise<string | null> {
	// Prefer mana-search (go-readability quality)
	try {
		const res = await fetch(`${MANA_SEARCH_URL}/api/v1/extract`, {
			method: 'POST',
			headers: { 'Content-Type': 'application/json' },
			body: JSON.stringify({ url, options: { includeMarkdown: true, maxLength: MAX_URL_CHARS } }),
			signal: AbortSignal.timeout(8_000),
		});
		if (res.ok) {
			const data = await res.json() as {
				success: boolean;
				content?: { title?: string; markdown?: string; text?: string };
			};
			if (data.success && data.content) {
				const text = data.content.markdown || data.content.text || '';
				if (text.trim()) {
					const title = data.content.title ? `# ${data.content.title}\n\n` : '';
					return (title + text).slice(0, MAX_URL_CHARS);
				}
			}
		}
	} catch {
		// mana-search nicht erreichbar — Fallback auf direktes Fetch
	}

	// Fallback: direktes HTTP-Fetch + einfaches HTML-Stripping
	try {
		const res = await fetch(url, {
			headers: { 'User-Agent': 'Mozilla/5.0 (compatible; mana-cards/1.0; +https://cardecky.mana.how)' },
			signal: AbortSignal.timeout(10_000),
		});
		if (!res.ok) return null;
		const html = await res.text();
		const text = html
			.replace(/<script[^>]*>[\s\S]*?<\/script>/gi, ' ')
			.replace(/<style[^>]*>[\s\S]*?<\/style>/gi, ' ')
			.replace(/<[^>]+>/g, ' ')
			.replace(/&amp;/g, '&').replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&nbsp;/g, ' ')
			.replace(/&#?\w+;/g, ' ')
			.replace(/\s+/g, ' ')
			.trim();
		return text ? text.slice(0, MAX_URL_CHARS) : null;
	} catch {
		return null;
	}
}