import { revalidatePath, revalidateTag } from "next/cache";
import { NextResponse } from "next/server";
import { PUBLIC_FACILITIES_CACHE_TAG } from "@/app/publicFacilities";
import { SITE_PAGE_CACHE_TAG } from "@/app/sitePages";
import { SITE_PAGE_SEO_CACHE_TAG } from "@/app/pageSeo";

export const runtime = "nodejs";

type RevalidatePayload = {
  includeFacilities?: boolean;
  includePlacePages?: boolean;
  includeSitePages?: boolean;
};

const FACILITY_PAGE_PATHS = ["/", "/golfbaner", "/medlemskap", "/vtg"];
const SITE_PAGE_PATHS = ["/golfbaner", "/vtg", "/medlemskap", "/banebesok", "/meninger", "/simulatorer"];

function getExpectedSecret(): string {
  return String(process.env.PUBLIC_SESSION_SECRET || "").trim();
}

function isAuthorized(request: Request): boolean {
  const expectedSecret = getExpectedSecret();
  if (!expectedSecret) {
    return false;
  }

  const suppliedSecret = String(request.headers.get("x-teeoff-revalidate-secret") || "").trim();
  return suppliedSecret === expectedSecret;
}

function revalidateFacilityPages(includePlacePages: boolean): void {
  revalidateTag(PUBLIC_FACILITIES_CACHE_TAG, "max");

  for (const path of FACILITY_PAGE_PATHS) {
    revalidatePath(path);
  }

  revalidatePath("/golfbaner/[slug]", "page");
  revalidatePath("/sted/[slug]", "page");

  if (includePlacePages) {
    revalidatePath("/sted/[slug]", "page");
  }
}

function revalidateSitePageContent(): void {
  revalidateTag(SITE_PAGE_CACHE_TAG, "max");
  revalidateTag(SITE_PAGE_SEO_CACHE_TAG, "max");

  for (const path of SITE_PAGE_PATHS) {
    revalidatePath(path);
  }
}

function revalidatePlacePagesOnly(): void {
  revalidatePath("/sted/[slug]", "page");
}

export async function POST(request: Request) {
  if (!isAuthorized(request)) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  let payload: RevalidatePayload = {};
  try {
    payload = (await request.json()) as RevalidatePayload;
  } catch {
    payload = {};
  }

  const includeFacilities = payload.includeFacilities !== false;
  const includePlacePages = payload.includePlacePages === true;
  const includeSitePages = payload.includeSitePages === true;

  if (includeFacilities) {
    revalidateFacilityPages(includePlacePages);
  } else if (includePlacePages) {
    revalidatePlacePagesOnly();
  }

  if (includeSitePages) {
    revalidateSitePageContent();
  }

  return NextResponse.json({
    revalidated: true,
    includeFacilities,
    includePlacePages,
    includeSitePages,
  });
}