(function () {
  'use strict';

  var STORAGE_KEY = 'pagemark-theme';

  function getDefaultTheme() {
    var now     = new Date();
    var minutes = now.getHours() * 60 + now.getMinutes();
    var start   = 8  * 60 + 30; // 08:30
    var end     = 17 * 60 + 30; // 17:30
    return (minutes >= start && minutes < end) ? 'light' : 'dark';
  }

  function applyTheme(theme) {
    document.documentElement.setAttribute('data-theme', theme);

    // Swap highlight.js stylesheets via l'attribut media (plus fiable que disabled)
    var light = document.getElementById('hl-light');
    var dark  = document.getElementById('hl-dark');
    if (light) light.media = (theme === 'dark') ? 'not all' : '';
    if (dark)  dark.media  = (theme === 'dark') ? '' : 'not all';

    // Icône du bouton
    var btn = document.getElementById('theme-toggle');
    if (btn) btn.textContent = theme === 'dark' ? '\u2600' : '\u263e'; // ☀ / ☾
  }

  // Appliquer immédiatement pour éviter le flash
  var stored = localStorage.getItem(STORAGE_KEY);
  var theme  = stored || getDefaultTheme();
  document.documentElement.setAttribute('data-theme', theme);

  function toggle() {
    var current = document.documentElement.getAttribute('data-theme');
    var next    = current === 'dark' ? 'light' : 'dark';
    localStorage.setItem(STORAGE_KEY, next);
    applyTheme(next);
  }

  // Attacher le bouton sans onclick inline (compatible CSP)
  document.addEventListener('DOMContentLoaded', function () {
    applyTheme(theme); // sync icône + stylesheets hl.js

    var btn = document.getElementById('theme-toggle');
    if (btn) btn.addEventListener('click', toggle);
  });
}());