// Builds web/index.html from web/src as build.rs does, runs its script against a stub DOM,
// and fails on anything thrown.
//
// This exists because a ReferenceError at load once blanked the whole UI: a patch
// anchored on a function that no longer existed, so `prefsModal` was referenced but
// never defined. `node --check` passes that happily -- it is a parse, not a run --
// and every server-side test passed too, because the server was fine.
//
//   node tests/page-smoke.js
const vm = require('vm');

const { buildPage } = require('../web/build.mjs');
// What ships: minified, so an id may have lost its quotes.
const { html, js: script, script: file } = buildPage('index.html');
if (!new RegExp(`<script src="?/${file.replace('.', '\\.')}\\?v=[0-9a-f]{12}"?>`).test(html)) {
  console.error(`FAIL: the page does not load /${file}?v=<hash>`); process.exit(1);
}
// Ids in the page, and in the markup the script builds for its dialogs.
const ids = new Set([...(html + script).matchAll(/\bid=(?:"([^"]+)"|([^\s>"']+))/g)].map(m => m[1] || m[2]));

const missing = [];
const el = (name) => new Proxy({ style: { setProperty(){}, getPropertyValue(){ return ''; } }, dataset: {}, classList: { add(){}, remove(){}, toggle(){}, contains(){ return false; } },
  value: '', textContent: '', innerHTML: '', hidden: false, children: [], firstElementChild: null,
  appendChild(){}, removeChild(){}, remove(){}, insertAdjacentHTML(){}, addEventListener(){},
  setAttribute(){}, getAttribute(){ return null; }, select(){}, setSelectionRange(){}, focus(){},
  replaceWith(){}, querySelector(){ return el('nested'); }, querySelectorAll(){ return []; },
  play(){ return Promise.resolve(); }, pause(){}, closest(){ return null; } },
  { get: (t, k) => k in t ? t[k] : undefined, set: (t, k, v) => (t[k] = v, true) });

const document = {
  querySelector(sel) {
    if (sel.startsWith('#') && !ids.has(sel.slice(1))) { missing.push(sel); return null; }
    return el(sel);
  },
  querySelectorAll: () => [],
  createElement: () => el('created'),
  addEventListener(){}, body: el('body'),
  documentElement: { dataset: {} },
};

const ctx = {
  document, console,
  window: { isSecureContext: false, addEventListener(){} },
  localStorage: { getItem: () => null, setItem(){}, removeItem(){} },
  navigator: { clipboard: undefined, sendBeacon(){}, mediaSession: undefined },
  fetch: (url) => Promise.resolve({
    ok: true, status: 200, text: () => Promise.resolve(''),
    json: () => Promise.resolve(
      String(url).includes('/api/settings')
        ? { schedule: 'every 60m', every_mins: 60, download_dir: '/tmp', max_total_gb: 0, max_age_days: 0 }
        : String(url).includes('/api/users')
          ? [{ id: 1, name: 'admin', admin: true, password: true }, { id: 2, name: 'sam', admin: false, password: false }]
          : /\/api\/(popular|directory)/.test(String(url))
            ? [{ id: 'f', title: 'A Feed', image: null, subscribers: 2, subscribed: true },
               { id: 'g', title: null, image: null, subscribers: 1, subscribed: false }]
            : /entries/.test(String(url)) ? { total: 0, entries: [] } : []),
  }),
  EventSource: function () { this.close = () => {}; },
  MediaMetadata: function () {},
  Blob: function () {},
  setTimeout, clearTimeout, setInterval, clearInterval,
  confirm: () => false, prompt: () => null, alert(){},
  Date, Math, JSON, Object, Array, String, Number, Promise, Error, FormData: function(){},
  URLSearchParams, encodeURIComponent, decodeURIComponent, parseInt, parseFloat, isNaN,
};
ctx.globalThis = ctx;
ctx.window.location = { href: '' };

try {
  vm.createContext(ctx);
  vm.runInContext(script, ctx, { filename: 'index.html<script>', timeout: 5000 });
} catch (e) {
  console.error('FAIL: the page script threw while loading\n  ' + e.stack.split('\n').slice(0, 3).join('\n  '));
  process.exit(1);
}

// The modals are built on demand, so a load-time check never reaches them. Drive the
// ones that construct markup from live data, which is where a bad field reference hides.
const feed = {
  id: 'f', url: 'https://x/rss', title: 'A Feed', image: null, folder: null,
  keywords: ['a'], allow_explicit: false, auto_download: true, max_new_per_check: 3,
  schedule: 'every 6h', schedule_mins: 360, every_mins: 360,
  last_checked: 1, next_check: 2, entries: 1, downloaded: 0, unread: 1, last_error: null,
};
const drive = [
  ['settingsModal', () => ctx.settingsModal(feed)],
  ['settingsModal (no override)', () => ctx.settingsModal({ ...feed, schedule: null, schedule_mins: null })],
  ['downloadLatestModal', () => ctx.downloadLatestModal(feed)],
  ['removeFeed', () => ctx.removeFeed(feed)],
  ['prefsModal', () => ctx.prefsModal()],
  ['usersModal', () => ctx.usersModal()],
  ['opmlModal', () => ctx.opmlModal()],
  ['selectFeed (directory)', () => ctx.selectFeed(':directory')],
  ['selectFeed (popular)', () => ctx.selectFeed(':popular')],
  ['selectFeed (currently listening)', () => ctx.selectFeed(':listening')],
  ['selectFeed (all subscriptions)', () => ctx.selectFeed(':all')],
  ['logsModal', () => ctx.logsModal()],
  ['keysModal', () => ctx.keysModal()],
  // `const S` is not reachable from here: top-level const/let do not become properties
  // of a vm context the way var and function declarations do.
  ['renderGroup', () => ctx.renderGroup(feed, [{ ...feed, id: 'child', group: 'f', orphaned: true }])],
];
for (const [name, fn] of drive) {
  try {
    const r = fn();
    if (r && typeof r.catch === 'function') r.catch(e => {
      console.error(`FAIL: ${name} rejected: ${e.message}`); process.exit(1);
    });
  } catch (e) {
    console.error(`FAIL: ${name} threw: ${e.message}`);
    process.exit(1);
  }
}

if (missing.length) {
  console.error('FAIL: handlers wired to elements that do not exist: ' + [...new Set(missing)].join(', '));
  process.exit(1);
}
console.log('OK: page script loads clean, every selector it wires at load exists');
// logsModal arms a poll timer; without this the pending interval keeps node alive.
process.exit(0);