/* Sage Modern UI Shell Theme & Layout Controller
   Handles: theme switching (dark/light), sidebar collapse, localStorage persistence
*/
(function() {
  'use strict';

  var THEME_KEY = 'sage_ui_theme';
  var SIDEBAR_KEY = 'sage_sidebar_collapsed';

  // Initialize theme on page load
  function initTheme() {
    var saved = null;
    try { saved = localStorage.getItem(THEME_KEY); } catch(e) {}
    var theme = saved || 'dark';
    document.documentElement.setAttribute('data-theme', theme);
    updateThemeIcon(theme);
  }

  // Toggle between dark and light
  function toggleTheme() {
    var current = document.documentElement.getAttribute('data-theme') || 'dark';
    var next = current === 'dark' ? 'light' : 'dark';
    document.documentElement.setAttribute('data-theme', next);
    try { localStorage.setItem(THEME_KEY, next); } catch(e) {}
    updateThemeIcon(next);
  }

  // Update the theme toggle icon based on current theme
  function updateThemeIcon(theme) {
    var btn = document.getElementById('theme_toggle_btn');
    if (!btn) return;
    if (theme === 'light') {
      // Show moon icon (switch to dark)
      btn.innerHTML = '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/></svg>';
    } else {
      // Show sun icon (switch to light)
      btn.innerHTML = '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg>';
    }
  }

  // Initialize sidebar state
  function initSidebar() {
    var collapsed = false;
    try { collapsed = localStorage.getItem(SIDEBAR_KEY) === 'true'; } catch(e) {}
    var sidebar = document.getElementById('sage_sidebar');
    if (sidebar && collapsed) {
      sidebar.classList.add('collapsed');
    }
  }

  // Toggle sidebar collapse
  function toggleSidebar() {
    var sidebar = document.getElementById('sage_sidebar');
    if (!sidebar) return;
    sidebar.classList.toggle('collapsed');
    var isCollapsed = sidebar.classList.contains('collapsed');
    try { localStorage.setItem(SIDEBAR_KEY, isCollapsed); } catch(e) {}

    // Update toggle icon
    var btn = document.getElementById('sidebar_toggle_btn');
    if (btn) {
      if (isCollapsed) {
        btn.innerHTML = '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="13 17 18 12 13 7"/><polyline points="6 17 11 12 6 7"/></svg>';
      } else {
        btn.innerHTML = '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="11 17 6 12 11 7"/><polyline points="18 17 13 12 18 7"/></svg>';
      }
    }
  }

  // Run on DOM ready
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', function() {
      initTheme();
      initSidebar();
    });
  } else {
    initTheme();
    initSidebar();
  }

  // Expose global functions for bricks bind access
  window.sageToggleTheme = toggleTheme;
  window.sageToggleSidebar = toggleSidebar;
  window.sageInitTheme = initTheme;
  window.sageInitSidebar = initSidebar;

})();