import { collectEvents } from "next-collect/server";
import { NextMiddleware, NextResponse, userAgent } from "next/server";

import { CONSOLE_URL, WEBAPP_URL, WEBSITE_URL } from "@calcom/lib/constants";
import { isIpInBanlist } from "@calcom/lib/getIP";
import { extendEventData, nextCollectBasicSettings } from "@calcom/lib/telemetry";

const V2_WHITELIST = [
  "/settings/admin",
  "/settings/billing",
  "/settings/developer/webhooks",
  "/settings/developer/api-keys",
  "/settings/my-account",
  "/settings/security",
  "/settings/teams",
  "/availability",
  "/bookings",
  "/event-types",
  "/workflows",
  "/apps",
  "/teams",
  "/success",
  "/auth/login",
];

// For pages
// - which has V1 versions being modified as V2
// - Add routing_forms to keep old links working
const V2_BLACKLIST = ["/apps/routing_forms/", "/apps/routing-forms/", "/apps/typeform/"];

const middleware: NextMiddleware = async (req) => {
  const url = req.nextUrl;

  if (["/api/collect-events", "/api/auth"].some((p) => url.pathname.startsWith(p))) {
    const callbackUrl = url.searchParams.get("callbackUrl");
    const { isBot } = userAgent(req);

    if (
      isBot ||
      (callbackUrl && ![CONSOLE_URL, WEBAPP_URL, WEBSITE_URL].some((u) => callbackUrl.startsWith(u))) ||
      isIpInBanlist(req)
    ) {
      // DDOS Prevention: Immediately end request with no response - Avoids a redirect as well initiated by NextAuth on invalid callback
      req.nextUrl.pathname = "/api/nope";
      return NextResponse.redirect(req.nextUrl);
    }
  }

  // Don't 404 old routing_forms links
  if (url.pathname.startsWith("/apps/routing_forms")) {
    url.pathname = url.pathname.replace("/apps/routing_forms", "/apps/routing-forms");
    return NextResponse.rewrite(url);
  }

  /** Display available V2 pages */
  if (
    !V2_BLACKLIST.some((p) => url.pathname.startsWith(p)) &&
    V2_WHITELIST.some((p) => url.pathname.startsWith(p))
  ) {
    // rewrite to the current subdomain under the pages/sites folder
    url.pathname = `/v2${url.pathname}`;
    return NextResponse.rewrite(url);
  }

  return NextResponse.next();
};

export default collectEvents({
  middleware,
  ...nextCollectBasicSettings,
  cookieName: "__clnds",
  extend: extendEventData,
});