import { dev } from "$app/environment";
import { acceptsLanguages } from "$lib/negotiation";
import { restoreSession } from "$lib/server/session";
import { isAuthEvent } from "$lib/types";
import { error, type Handle, redirect } from "@sveltejs/kit";
import { sequence } from "@sveltejs/kit/hooks";

/**
 * {@link https://svelte.dev/docs/cli/devtools-json}
 */
const devHandle: Handle = ({ event, resolve }) => {
  const path = "/.well-known/appspecific/com.chrome.devtools.json";
  if (dev && event.url.pathname === path) {
    return new Response(null, { status: 404 });
  }
  return resolve(event);
};

export const defaultHandle: Handle = async ({ event, resolve }) => {
  if (isAuthEvent(event) === false) {
    error(500);
  }

  const languages = acceptsLanguages(event.request);
  event.locals.locale = languages[0] === "*" ? undefined : languages[0];

  // [TODO] necessary?
  // if (
  //   event.url.searchParams.has("session") ||
  //   event.request.headers.has("x-session") ||
  //   event.request.headers.get("sec-fetch-mode") === "navigate" ||
  //   // event.request.headers.get("sec-fetch-dest") === "empty"
  // ) {
  await restoreSession(event);
  // }

  if (
    event.route.id?.startsWith("/(protected)/") &&
    event.locals.user === undefined
  ) {
    redirect(307, "/");
  }

  return resolve(event, {
    filterSerializedResponseHeaders: (name: string, _value: string) => {
      return ["content-type"].includes(name.toLowerCase());
    },
  });
};

export const handle: Handle = sequence(devHandle, defaultHandle);