(function() {
  const STORAGE_KEY = 'stl-repo-theme';

  function getTheme() {
    return localStorage.getItem(STORAGE_KEY) || 'dark';
  }

  function setTheme(theme) {
    localStorage.setItem(STORAGE_KEY, theme);
    applyTheme(theme);
  }

  function applyTheme(theme) {
    const html = document.documentElement;
    if (theme === 'light') {
      html.classList.add('light-mode');
    } else {
      html.classList.remove('light-mode');
    }
    window.dispatchEvent(new CustomEvent('themechange', { detail: theme }));
  }

  function toggleTheme() {
    const current = getTheme();
    setTheme(current === 'dark' ? 'light' : 'dark');
  }

  // Expose globally
  window.getTheme = getTheme;
  window.setTheme = setTheme;
  window.toggleTheme = toggleTheme;

  // Apply on load
  document.addEventListener('DOMContentLoaded', () => {
    applyTheme(getTheme());
    const btn = document.getElementById('theme-toggle');
    if (btn) btn.addEventListener('click', toggleTheme);
  });
})();