/*
 * text-watchdog.js — make sure the Bible text on screen is never blank. Isolated + additive.
 *
 * Rarely a Bible tab finishes "loading" with an empty reading area (a render race). On stage that
 * looks like the app broke. So: check the ACTIVE bible tab every 2s and, if it is empty on two
 * consecutive checks, silently re-render THAT tab's already-chosen passage.
 *
 * It never opens anything you didn't open. It only re-draws the passage already loaded in the tab
 * you are looking at, it skips every passage-picker screen so it can't jump you into a chapter you
 * haven't chosen, and it gives up after 2 tries so it can never sit in a loop.
 *
 * (This file used to also restore your previous tabs on startup. That was removed — the app now
 * always starts fresh.)
 */
(function () {
  'use strict';

  // One-time cleanup: bin anything the old session-restore feature left on this machine, so an
  // upgraded install can never resurrect a remembered set of tabs.
  try {
    localStorage.removeItem('bibleapp-session');
    localStorage.removeItem('bibleapp-lastPassage');
    localStorage.removeItem('sessionRestoreEnabled');
  } catch (_) {}

  /*
   * ---- Stylesheet watchdog ----
   * Going to Settings or the Content Manager NAVIGATES the window, so coming back is a full page
   * load. If styles.css does not arrive (or arrives broken), the app renders as a bare list of book
   * names — unusable, and alarming to discover seconds before a service. Check once, shortly after
   * load, that our stylesheet is actually present with a sane number of rules, and if not, reload the
   * page ONE time. The one-shot flag makes a reload loop impossible even if the CSS is truly broken.
   */
  function checkStylesheet() {
    try {
      var sheets = document.styleSheets, rules = 0, found = false;
      for (var i = 0; i < sheets.length; i++) {
        var href = sheets[i].href || '';
        if (href.indexOf('styles.css') === -1) continue;
        found = true;
        try { rules = sheets[i].cssRules ? sheets[i].cssRules.length : 0; } catch (_) { rules = -1; }
        break;
      }
      // -1 means we cannot inspect it (cross-origin); that is not evidence of breakage.
      if (found && rules !== -1 && rules < 50) found = false;
      if (found) { try { sessionStorage.removeItem('cssReloadTried'); } catch (_) {} return; }
      var tried = false;
      try { tried = sessionStorage.getItem('cssReloadTried') === '1'; } catch (_) {}
      if (tried) {
        console.error('[STYLE WATCHDOG] styles.css still missing/short after a reload — leaving the page alone.');
        return;
      }
      try { sessionStorage.setItem('cssReloadTried', '1'); } catch (_) {}
      console.warn('[STYLE WATCHDOG] styles.css missing or truncated — reloading once.');
      location.reload();
    } catch (_) {}
  }
  if (document.readyState === 'complete') setTimeout(checkStylesheet, 800);
  else window.addEventListener('load', function () { setTimeout(checkStylesheet, 800); });

  var emptyStreak = 0;
  var retryCounts = {};
  setInterval(function () {
    try {
      var app = window.bibleApp;
      if (!app || !app.tabs) return;
      var tab = app.tabs.find(function (t) { return t.id === app.activeTabId; });
      if (!tab || tab.mode !== 'bible' || !tab.book) { emptyStreak = 0; return; }
      if (tab.isSelectingVerses || !tab.loaded) { emptyStreak = 0; return; }
      var sel = document.getElementById('selectionContent' + tab.id) || document.getElementById('verseCards' + tab.id) || document.getElementById('bookCards' + tab.id);
      if (sel && sel.offsetParent !== null) { emptyStreak = 0; return; }
      var el = document.getElementById('bibleText' + tab.id);
      if (!el) { emptyStreak = 0; return; }
      var empty = !(el.textContent && el.textContent.trim().length > 0);
      if (!empty) { emptyStreak = 0; return; }
      emptyStreak++;
      if (emptyStreak < 2) return;
      emptyStreak = 0;
      var key = tab.id + '|' + tab.book + '|' + tab.chapter + '|' + (tab.translation || '');
      retryCounts[key] = (retryCounts[key] || 0) + 1;
      if (retryCounts[key] > 2) return;
      console.warn('[TEXT WATCHDOG] Blank bible text detected — re-rendering', tab.book, tab.chapter);
      tab.loaded = false;
      if (typeof app.loadPassage === 'function') app.loadPassage(tab.id);
    } catch (_) {}
  }, 2000);
})();