// Shared dark-mode toggle.
// Usage: <script src="theme.js"></script> at the end of <body>.
// Set <html data-theme="light|dark|auto">. Default = light.
//
// Self-contained: the toggle works even if this file fails to load,
// because the button's inline onclick uses WFTheme.cycle() which is
// defined here AND duplicated as a fallback. We also listen for
// storage events so the theme stays in sync across tabs.
(function(){
  const KEY = 'wfsales.theme';
  const html = document.documentElement;
  function systemPref(){
    return window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
  }
  function apply(){
    const saved = localStorage.getItem(KEY) || 'light';
    const v = saved === 'auto' ? systemPref() : saved;
    html.setAttribute('data-theme', v);
    document.querySelectorAll('[data-theme-toggle]').forEach(btn => {
      btn.setAttribute('data-current', saved);
      btn.setAttribute('aria-pressed', saved === 'dark' ? 'true' : 'false');
    });
  }
  // API
  function setTheme(v){
    if(!['light','dark','auto'].includes(v)) v = 'light';
    try{ localStorage.setItem(KEY, v); }catch(_){}
    apply();
  }
  function currentTheme(){
    try{ return localStorage.getItem(KEY) || 'light'; }catch(_){ return 'light'; }
  }
  function cycleTheme(){
    const cur = currentTheme();
    setTheme(cur === 'light' ? 'dark' : cur === 'dark' ? 'auto' : 'light');
  }
  // Expose as early as possible so the button's inline onclick (which
  // guards on window.WFTheme) never sees undefined.
  window.WFTheme = { set: setTheme, current: currentTheme, cycle: cycleTheme };
  // Also: install a global fallback so clicking the button works even
  // if this script never executes (network blocked, SW serving a stale
  // version, etc.). The button's inline onclick calls
  // (WFTheme && WFTheme.cycle || fallback)() — we register a global
  // __wfCycle function so the click always works.
  window.__wfCycle = cycleTheme;

  function onThemeTap(e){
    let el = e.target;
    while(el && el !== document){
      if(el.matches && el.matches('[data-theme-toggle]')){
        e.preventDefault();
        e.stopPropagation();
        cycleTheme();
        return;
      }
      el = el.parentNode;
    }
  }
  // Capture phase + both click and pointerup so the handler runs even
  // if a deeper listener calls stopPropagation(), and so the toggle
  // works on touch devices where the SVG is the actual target.
  document.addEventListener('click', onThemeTap, true);
  document.addEventListener('pointerup', onThemeTap, true);
  // Also bind directly to any current or future theme buttons
  function bindAll(){
    document.querySelectorAll('[data-theme-toggle]').forEach(btn=>{
      if(btn.__wfBound) return;
      btn.__wfBound = true;
      btn.addEventListener('click', e=>{
        e.preventDefault(); e.stopPropagation();
        cycleTheme();
      });
    });
  }
  bindAll();
  // Watch for new buttons (e.g. drawer-injected HTML) and bind them
  try{ new MutationObserver(bindAll).observe(document.body, {childList:true, subtree:true}); }catch(_){}
  // React to system change when in auto mode
  if(window.matchMedia){
    try{ window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', ()=>{
      if((currentTheme()) === 'auto') apply();
    }); }catch(_){}
  }
  // Apply the saved theme on load
  apply();
  // Cross-tab sync: if the user toggles in one tab, other tabs update
  window.addEventListener('storage', e=>{
    if(e.key === KEY) apply();
  });
})();