import { NextResponse } from "next/server";
import { getActiveProducts } from "@/lib/data";
import { formatPrice } from "@/lib/format";
import { rateLimit, getClientIp } from "@/lib/rate-limit";
import { getLocale } from "@/i18n/locale";

const SUGGESTION_LIMIT = 5;
const SUGGEST_ATTEMPTS_PER_WINDOW = 60;
const SUGGEST_WINDOW_MS = 60 * 1000;

/**
 * Liefert bis zu 5 passende Produkte fuer die Live-Suchvorschlaege im
 * Header — dieselbe Suchlogik wie die Shop-Uebersicht (getActiveProducts),
 * nur ohne vollen Seiten-Reload. Rein oeffentliche, bereits im Shop
 * sichtbare Produktdaten, keine Authentifizierung noetig, aber wie jeder
 * andere oeffentliche Endpunkt hier rate-limitiert (grosszuegig, da bei
 * jedem Tastenanschlag aufgerufen).
 */
export async function GET(request: Request) {
  const ip = await getClientIp();
  if (!rateLimit(`search-suggest:${ip}`, SUGGEST_ATTEMPTS_PER_WINDOW, SUGGEST_WINDOW_MS)) {
    return NextResponse.json({ suggestions: [] }, { status: 429 });
  }

  const query = new URL(request.url).searchParams.get("q")?.trim() ?? "";
  if (query.length < 2) {
    return NextResponse.json({ suggestions: [] });
  }

  const locale = await getLocale();
  const products = await getActiveProducts({ query, onlyAvailable: true });
  const suggestions = products.slice(0, SUGGESTION_LIMIT).map((product) => ({
    slug: product.slug,
    name: product.name,
    price: formatPrice(product.priceCents, product.currency, locale),
  }));

  return NextResponse.json({ suggestions });
}