import { defineEventHandler, getRequestURL, setResponseStatus } from 'h3';

import { resolveRoute } from '../../app/core/routes';

/**
 * Answers 404 for addresses this app does not serve.
 *
 * The status cannot be set from the catch-all page's `load`: Analog resolves
 * loaders through an internal request, so anything set on that response never
 * reaches the browser. Here it can be, and the route table is small enough to
 * state outright — the landing, plus the addresses records live at.
 */
const KNOWN_PATHS = new Set(['/', '/index.html']);

const PASSTHROUGH_PREFIXES = ['/api/', '/_analog/', '/assets/', '/@', '/src/', '/node_modules/'];

export default defineEventHandler((event) => {
  const { pathname } = getRequestURL(event);

  if (KNOWN_PATHS.has(pathname)) {
    return;
  }

  // Static files answer for themselves — a missing one is Nitro's 404, not a
  // page, and stamping this status on a hit would break the asset.
  if (
    PASSTHROUGH_PREFIXES.some((prefix) => pathname.startsWith(prefix)) ||
    /\.[a-z0-9]+$/i.test(pathname)
  ) {
    return;
  }

  // Shaped like a record's address (`/sobre-nosotros`, `/proyectos/x`,
  // `/en/team/x`). Only the API knows whether it exists, and asking it here
  // would be a second request for what the page asks anyway — so the page
  // sets the 404 itself when the API has nothing there. See `ui/page-shell.ts`.
  if (resolveRoute(pathname)) {
    return;
  }

  setResponseStatus(event, 404);
});