/**
 * ECHO 3D — entry point.
 *
 * Wires the modules:
 *   Scene3D  → real Three.js scene (sky + clouds + grass + goats + stars)
 *   TTS      → StreamElements / Google / browser voices
 *   Auth     → localStorage-backed accounts
 *   Game     → word logic
 *   GameUI   → DOM bindings, GSAP animations, confetti
 *   AuthUI   → login/register form
 *   LeaderboardUI → live scoreboard
 */

import './styles/main.css';

import { Scene3D } from './scene/Scene3D.js';
import { TTS } from './audio/TTS.js';
import { AmbientAudio } from './audio/AmbientAudio.js';
import { SoundLibrary } from './audio/SoundLibrary.js';
import { Auth } from './auth/Auth.js';
import * as Store from './game/Store.js';
import { loadFullDictionary } from './game/Dictionary.js';
import { Game } from './game/Game.js';
import { AuthUI } from './ui/AuthUI.js';
import { LeaderboardUI } from './ui/LeaderboardUI.js';
import { GameUI } from './ui/GameUI.js';
import { AdminUI } from './ui/AdminUI.js';

// Boot loader helper — updates the full-screen overlay before the app renders.
const bootLoader = {
  msgEl: () => document.getElementById('bootMsg'),
  barEl: () => document.getElementById('bootBar'),
  set(pct, msg) {
    const m = this.msgEl(); if (m && msg) m.textContent = msg;
    const b = this.barEl(); if (b) b.style.width = Math.max(0, Math.min(100, pct)) + '%';
  },
  done() {
    const el = document.getElementById('bootLoader');
    if (!el) return;
    el.classList.add('gone');
    setTimeout(() => el.remove(), 700);
  },
};

async function boot() {
  bootLoader.set(5, 'Initialising…');

  // Detect the admin URL up-front so we can gate the auth screen accordingly.
  const adminUrl = (() => {
    const url = new URL(location.href);
    if (url.searchParams.has('admin')) return true;
    if (location.hash === '#admin') return true;
    if (/\/admin\/?$/.test(location.pathname)) return true;
    return false;
  })();

  // If the existing cached session belongs to a non-admin user but the URL
  // says /admin, clear it so the form requires an admin sign-in.
  if (adminUrl) {
    const me = Auth.current();
    if (me && !me.isAdmin) await Auth.logout().catch(() => {});
  }

  // ---- Auth UI first — it must work even if the 3D scene fails to init ----
  const leaderboardUI = new LeaderboardUI();
  const authUI = new AuthUI({ onEnter: () => enterApp(), adminOnly: adminUrl });

  // Admin dashboard. The game stays mounted in the background; switching to
  // the game view just hides the admin overlay.
  const adminUI = new AdminUI({
    onSwitchToGame: () => {
      document.getElementById('appWrap').style.display = '';
      document.getElementById('bg3d').style.display    = 'block';
      // Strip the admin marker from the URL so a refresh lands on the game.
      const url = new URL(location.href);
      url.searchParams.delete('admin');
      if (url.hash === '#admin') url.hash = '';
      history.replaceState(null, '', url);
    },
  });
  document.getElementById('adminBtn')?.addEventListener('click', () => openAdminPage());

  /**
   * Routes that should land on the admin dashboard:
   *   /admin    (works on dev server; on HF Spaces static this is a 404)
   *   ?admin    (works everywhere)
   *   #admin    (works everywhere, recommended for static hosts)
   */
  function isAdminRoute() {
    const url = new URL(location.href);
    if (url.searchParams.has('admin')) return true;
    if (location.hash === '#admin') return true;
    if (/\/admin\/?$/.test(location.pathname)) return true;
    return false;
  }

  function openAdminPage() {
    if (!Auth.isAdmin()) {
      alert('Admin access only. Sign in with an admin account.');
      return;
    }
    document.getElementById('appWrap').style.display = 'none';
    document.getElementById('bg3d').style.display    = 'none';
    adminUI.openAsPage();
  }

  async function enterApp(asGuest) {
    try {
      // Switch the persistence namespace to the now-logged-in user's email
      // (or 'guest' if they hit Continue as guest). If the namespace actually
      // changed, reload progress and re-render the UI so the player sees
      // *their* data rather than whatever was visible before login.
      // AuthUI passes asGuest=true after the guest button — Auth.logout()
      // isn't awaited there, so the cached user may still resolve briefly.
      const me = asGuest ? null : Auth.current();
      const ns = (me?.email || 'guest').toLowerCase();
      if (Store.getNamespace() !== ns) {
        await Store.setNamespace(ns);
        // game/ui are created later in boot() but enterApp is only called
        // after they exist (either at end of boot, or via authUI onEnter
        // which fires only once the login form is interactive).
        // Pull this user's per-word progress from the backend, then load
        // (the merge inside syncFromRemote lands records in IDB/LS so
        // reloadProgress sees them).
        await Store.syncFromRemote();
        await game.reloadProgress();
        await ui.applySettings();
        ui.renderAll();
      }

      leaderboardUI.refreshUserChip();
      leaderboardUI.render();
      leaderboardUI.startAutoRefresh();

      const adminBtn = document.getElementById('adminBtn');
      if (adminBtn) adminBtn.style.display = Auth.isAdmin() ? 'block' : 'none';

      // Default landing = the game. The admin dashboard only opens when the
      // URL explicitly requests it.
      if (isAdminRoute()) {
        if (Auth.isAdmin()) openAdminPage();
        else alert('Admin access only. Sign in with an admin account.');
      }
    } catch (e) { console.warn('enterApp non-fatal:', e); }
  }

  /** Top-of-screen banner shown when persistent storage is unavailable. */
  function showStorageWarning(msg) {
    if (!msg || document.getElementById('storageWarning')) return;
    const el = document.createElement('div');
    el.id = 'storageWarning';
    el.textContent = '⚠ ' + msg;
    el.style.cssText = `
      position:fixed;top:0;left:0;right:0;z-index:99999;
      background:#FF6B6B;color:#fff;padding:8px 14px;
      font:600 13px/1.3 system-ui,sans-serif;text-align:center;
      box-shadow:0 2px 6px rgba(0,0,0,.3);cursor:pointer;
    `;
    el.title = 'Click to dismiss';
    el.addEventListener('click', () => el.remove());
    document.body.appendChild(el);
  }

  // ---- Try the 3D scene, but never let a failure break auth ----
  bootLoader.set(15, 'Building the 3D world…');
  let scene3d;
  try {
    scene3d = new Scene3D(document.getElementById('bg3d'));
  } catch (e) {
    console.error('3D scene failed to initialize:', e);
    // Stub that satisfies the methods GameUI calls
    scene3d = {
      setIntensity() {},
      setAmbient(on) { document.getElementById('bg3d').style.display = on ? 'block' : 'none'; },
      celebrate() {},
    };
  }

  // Persistence
  bootLoader.set(25, 'Opening local database…');
  await Store.open();

  // If there's a cached session, scope all reads to that user's namespace
  // BEFORE we load progress — otherwise loadProgress reads from 'guest'
  // and the player sees nothing.
  {
    const me = Auth.current();
    if (me?.email) await Store.setNamespace(me.email.toLowerCase());
  }

  // Surface a visible warning if persistent storage isn't available — the old
  // code silently fell back to in-memory and lost progress on reload.
  showStorageWarning(Store.warning());

  // TTS
  const tts = new TTS({
    audioEl: document.getElementById('audio'),
    speakerEl: document.getElementById('speaker'),
  });

  // Ambient day/night sound — bird chirps by day, crickets + owl by night.
  // Needs the in-game clock so it knows time-of-day.
  const ambient = new AmbientAudio();
  if (scene3d?.gameClock) ambient.setClock(scene3d.gameClock);

  // File-based sound library (day/night/wind/water/birds/crane/goat/bubbles).
  // Reads /public/sounds/manifest.json; see /public/sounds/README.txt.
  const soundLib = new SoundLibrary();
  if (scene3d?.gameClock) soundLib.setClock(scene3d.gameClock);

  // Start audio on first user gesture so autoplay policy is satisfied.
  const _startAmbient = () => {
    ambient.start();
    soundLib.start();
    window.removeEventListener('pointerdown', _startAmbient);
    window.removeEventListener('keydown',     _startAmbient);
  };
  window.addEventListener('pointerdown', _startAmbient);
  window.addEventListener('keydown',     _startAmbient);
  // expose to settings panel + scene events
  window.__ambient = ambient;
  window.__sounds  = soundLib;

  // Dictionary load (progress shown on full-screen boot loader + game card)
  const progress = (m) => {
    const el = document.getElementById('bootStatus'); if (el) el.textContent = m;
    // Map the dictionary phase across 35–85% of the boot bar.
    const pct = m.includes('cached')          ? 80 :
                m.includes('common-word')     ? 40 :
                m.includes('full English')    ? 55 :
                m.includes('Merging')         ? 75 :
                m.includes('Caching')         ? 82 : 50;
    bootLoader.set(pct, m);
  };
  let dict;
  try {
    bootLoader.set(35, 'Loading dictionary…');
    dict = await loadFullDictionary({
      getCache: Store.getCache,
      setCache: Store.setCache,
      progress,
    });
  } catch (e) {
    bootLoader.set(100, '⚠ Failed to load dictionary — check your internet.');
    progress('⚠ Failed to load dictionary — check your internet.');
    return;
  }

  // Game
  bootLoader.set(90, 'Preparing your progress…');
  const game = new Game(dict);
  // If a session is cached, pull the user's word progress from the backend
  // BEFORE loadProgress so the merged local store has the latest from any
  // browser/device the user logged in from. No-op when offline or guest.
  await Store.syncFromRemote();
  await game.loadProgress();

  const ui = new GameUI({ game, tts, scene3d, leaderboardUI });
  await ui.applySettings();
  ui.renderAll();
  ui.finishBoot(`✓ ${dict.set.size.toLocaleString()} English words ready · ${dict.lengths().length} grades`);

  // Decide login vs main app
  bootLoader.set(100, 'Ready.');
  if (Auth.session()) {
    authUI.hide();
    enterApp();
  } else {
    authUI.show();
  }
  bootLoader.done();

  // Resize sanity for the 3D canvas
  window.addEventListener('resize', () => { /* Scene3D handles this internally */ });
}

boot().catch((e) => {
  console.error(e);
  const el = document.getElementById('bootStatus');
  if (el) el.innerHTML = `<span style="color:#FF6B6B">Error: ${e.message}</span>`;
});