export default {
  async fetch(request, env) {
    const targetUrl = env.TARGET_URL;
    if (!targetUrl) {
      return new Response("Brak TARGET_URL", { status: 500 });
    }

    try {
      const targetObj = new URL(targetUrl);
      const requestObj = new URL(request.url);

      // Modyfikacja nagłówków, aby oszukać stronę docelową
      const headers = new Headers(request.headers);
      headers.set("Host", targetObj.host);
      headers.set("Referer", targetUrl);

      // Pobranie danych
      const response = await fetch(targetUrl, {
        method: request.method,
        headers: headers,
        redirect: "follow"
      });

      // Jeśli to nie jest HTML (np. obrazek, plik JS/CSS), zwróć go bez zmian
      const contentType = response.headers.get("content-type") || "";
      if (!contentType.includes("text/html")) {
        return response;
      }

      // Jeśli to HTML, podmień stare linki na adres Twojego workera
      let html = await response.text();
      const globalRegex = new RegExp(targetObj.origin, "g");
      html = html.replace(globalRegex, requestObj.origin);

      return new Response(html, {
        status: response.status,
        headers: {
          "content-type": "text/html;charset=UTF-8"
        }
      });
    } catch (e) {
      return new Response("Blad: " + e.message, { status: 500 });
    }
  }
};