'use strict';

// ---------------------------------------------------------------------------
// Init
// ---------------------------------------------------------------------------

(function init() {
  // Migrate PBKDF2-derived key stored by login/register form
  if (window.USER_ID) {
    const pending = localStorage.getItem('diora_pending_enc_key');
    if (pending) {
      localStorage.setItem(`diora_enc_key_${window.USER_ID}`, pending);
      localStorage.removeItem('diora_pending_enc_key');
    }
  }

  // Populate saved stations from server-side context if available
  if (typeof INITIAL_SAVED !== 'undefined' && Array.isArray(INITIAL_SAVED)) {
    // The server already renders saved stations in the template; nothing extra needed.
    // But if JS-rendered saved tab were needed we'd call addSavedRow here.
  }

  // Restore persisted volume, fall back to slider default
  const volSlider = $('volume');
  if (volSlider) {
    const saved = localStorage.getItem('diora_volume');
    const vol = saved !== null ? parseInt(saved, 10) : parseInt(volSlider.value, 10);
    setVolume(vol);
  }

  // Restore persisted read-aloud language
  const ttsLangSelect = $('reader-tts-lang');
  if (ttsLangSelect) ttsLangSelect.value = ttsLang;

  // Load recommendations on page load
  loadRecommendations();

  // Initialise focus timer display
  renderTimer();

  // Initialise mood/genre chips
  initMoodChips();

  // Initialise curated station lists
  initCuratedLists();

  // Show curated lists again when search input is cleared
  const searchInput = document.getElementById('search-input');
  if (searchInput) {
    searchInput.addEventListener('input', function () {
      if (this.value === '') {
        const curated = document.getElementById('curated-lists');
        if (curated) curated.style.display = '';
      }
    });
  }

  // Load focus session stats
  loadFocusStats();

  // Apply encrypted wallpaper (if set)
  applyEncryptedBackground();

  // Init book drop zone
  initBookDropZone();
  const showReadToggle = $('book-show-read-toggle');
  if (showReadToggle) showReadToggle.checked = _bookShowRead;

  // Restore active tab: a URL hash (shared/bookmarked link, or browser
  // back/forward) wins over the last-used tab remembered in localStorage —
  // except when offline, where books (usable offline) always takes over.
  const offlineOverride = !navigator.onLine && IS_AUTHENTICATED;
  const hashTab = (location.hash || '').replace(/^#/, '').split('/')[0];
  if (!offlineOverride && TOP_TABS.includes(hashTab)) {
    _routeFromHash();
  } else {
    const savedTab = localStorage.getItem('diora_active_tab') || 'radio';
    const savedRadioTab = localStorage.getItem('diora_active_radio_tab') || 'saved';
    showTab(offlineOverride ? 'books' : savedTab);
    showRadioTab(savedRadioTab);
  }

  // React to connectivity changes
  window.addEventListener('offline', () => {
    showOfflineBanner(true);
    if (IS_AUTHENTICATED) showTab('books');
  });
  window.addEventListener('online', async () => {
    showOfflineBanner(false);
    await _syncPendingAnnotations();
    loadBookList(); // sends the positions read offline first (the progress outbox)
  });

  // Show banner immediately if already offline at startup
  if (!navigator.onLine) showOfflineBanner(true);

  // Reading position: positions reached by the reader's own doing count (see _noteReadingPosition).
  {
    const content = $('reader-content');
    if (content) {
      for (const type of ['wheel', 'touchstart', 'mousedown']) {
        content.addEventListener(type, _noteReaderInteraction, {passive: true, capture: true});
      }
    }
    document.addEventListener('keydown', () => { if (currentBookId) _noteReaderInteraction(); }, true);
    if (IS_AUTHENTICATED) _flushProgressOutbox();
  }

  // Footnote hover (desktop) + tap (mobile) via event delegation
  const _readerContentEl = $('reader-content');
  if (_readerContentEl) {
    _readerContentEl.addEventListener('mouseover', e => {
      const link = e.target.closest('[data-footnote-ref]');
      if (!link) return;
      clearTimeout(_footnotePopoverTimer);
      _footnotePopoverTimer = setTimeout(() => showFootnotePopover(link), 120);
    });
    _readerContentEl.addEventListener('mouseout', e => {
      if (!e.target.closest('[data-footnote-ref]')) return;
      _footnotePopoverTimer = setTimeout(dismissFootnotePopover, 250);
    });
    _readerContentEl.addEventListener('click', e => {
      const link = e.target.closest('[data-footnote-ref]');
      if (!link) return;
      e.preventDefault();
      if (currentFootnotePopover?._refLink === link) {
        dismissFootnotePopover();
      } else {
        showFootnotePopover(link);
      }
    });

    // Text selection → highlight color/note popover
    _readerContentEl.addEventListener('mouseup', handleReaderSelection);
    _readerContentEl.addEventListener('touchend', e => {
      const target = e.target;
      const touch = e.changedTouches && e.changedTouches[0];
      const clientX = touch ? touch.clientX : undefined;
      const clientY = touch ? touch.clientY : undefined;
      setTimeout(() => handleReaderSelection({target, clientX, clientY}), 50);
    });
  }

  // Margin ("page margin") panel — click a marker to view/edit, click empty
  // space to anchor a new freeform note at that line's height
  const _readerMarginEl = $('reader-margin');
  if (_readerMarginEl) {
    _readerMarginEl.addEventListener('click', handleMarginClick);
  }
})();