const terminal     = document.getElementById('terminal');
    const titlebar     = document.getElementById('titlebar');
    const startBtn     = document.getElementById('tb-start');
    const startMenu    = document.getElementById('startmenu');
    const tbWinItem    = document.getElementById('tb-terminal-item');
    const smTermLaunch = document.getElementById('sm-terminal-launch');

    const MIN_W = 320, MIN_H = 160;
    let winState   = 'normal'; 
    let savedRect  = null;
    let menuOpen   = false;

    function saveRect() {
      savedRect = {
        left:   terminal.offsetLeft,
        top:    terminal.offsetTop,
        width:  terminal.offsetWidth,
        height: terminal.offsetHeight,
      };
    }

    function setWinState(s) {
      winState = s;
      updateTaskbarItem();
    }

    function updateTaskbarItem() {
      const indicator = tbWinItem.querySelector('.tb-win-indicator');
      const closed = winState === 'closed';
      tbWinItem.classList.toggle('tb-item-active',    winState === 'normal' || winState === 'maximized');
      tbWinItem.classList.toggle('tb-item-minimized', winState === 'minimized');
      tbWinItem.classList.toggle('tb-item-closed',    closed);
      indicator.style.opacity = closed ? '0' : '1';
    }

    function restoreWindow() {
      terminal.style.display = '';
      terminal.classList.remove('maximized');
      if (savedRect) {
        terminal.style.left   = savedRect.left   + 'px';
        terminal.style.top    = savedRect.top    + 'px';
        terminal.style.width  = savedRect.width  + 'px';
        terminal.style.height = savedRect.height + 'px';
      } else {
        centerWindow();
      }
      setWinState('normal');
    }

    function centerWindow() {
      terminal.style.left   = Math.round(window.innerWidth  / 2 - terminal.offsetWidth  / 2) + 'px';
      terminal.style.top    = Math.round((window.innerHeight - 44) / 2 - terminal.offsetHeight / 2) + 'px';
    }

    centerWindow();
    updateTaskbarItem();

    function toggleMenu(e) {
      e.stopPropagation();
      menuOpen = !menuOpen;
      startMenu.classList.toggle('open', menuOpen);
      startMenu.setAttribute('aria-hidden', String(!menuOpen));
      startBtn.classList.toggle('active', menuOpen);
    }

    startBtn.addEventListener('click', toggleMenu);

    document.addEventListener('click', (e) => {
      if (menuOpen && !startMenu.contains(e.target) && e.target !== startBtn) {
        menuOpen = false;
        startMenu.classList.remove('open');
        startMenu.setAttribute('aria-hidden', 'true');
        startBtn.classList.remove('active');
      }
    });

    startMenu.querySelectorAll('a').forEach(a => {
      a.addEventListener('click', () => {
        menuOpen = false;
        startMenu.classList.remove('open');
        startBtn.classList.remove('active');
      });
    });

    smTermLaunch.addEventListener('click', () => {
      menuOpen = false;
      startMenu.classList.remove('open');
      startBtn.classList.remove('active');
      if (winState === 'closed' || winState === 'minimized') {
        restoreWindow();
      } else if (winState === 'normal' || winState === 'maximized') {
        terminal.classList.add('flash');
        setTimeout(() => terminal.classList.remove('flash'), 300);
      }
    });

    tbWinItem.addEventListener('click', () => {
      if (winState === 'closed') {
        restoreWindow();
      } else if (winState === 'minimized') {
        restoreWindow();
      } else if (winState === 'normal' || winState === 'maximized') {
        saveRect();
        terminal.style.display = 'none';
        setWinState('minimized');
      }
    });

    document.getElementById('btn-close').addEventListener('click', () => {
      saveRect();
      terminal.style.display = 'none';
      setWinState('closed');
    });

    document.getElementById('btn-minimize').addEventListener('click', () => {
      if (winState === 'minimized') return;
      if (winState !== 'maximized') saveRect();
      terminal.style.display = 'none';
      setWinState('minimized');
    });

    document.getElementById('btn-maximize').addEventListener('click', toggleMaximize);
    titlebar.addEventListener('dblclick', (e) => {
      if (e.target.closest('.wm-btn')) return;
      toggleMaximize();
    });

    function toggleMaximize() {
      if (winState === 'maximized') {
        winState = 'normal';
        terminal.classList.remove('maximized');
        if (savedRect) {
          terminal.style.left   = savedRect.left   + 'px';
          terminal.style.top    = savedRect.top    + 'px';
          terminal.style.width  = savedRect.width  + 'px';
          terminal.style.height = savedRect.height + 'px';
        }
        setWinState('normal');
      } else {
        saveRect();
        terminal.classList.add('maximized');
        terminal.style.left   = '0';
        terminal.style.top    = '0';
        terminal.style.width  = '100vw';
        terminal.style.height = 'calc(100vh - 44px)';
        setWinState('maximized');
      }
    }

    let dragging = false, dragSX, dragSY, dragL, dragT;

    titlebar.addEventListener('mousedown', (e) => {
      if (e.target.closest('.wm-btn') || winState === 'maximized') return;
      dragging = true;
      dragSX = e.clientX; dragSY = e.clientY;
      dragL  = terminal.offsetLeft; dragT = terminal.offsetTop;
      titlebar.style.cursor = 'grabbing';
      e.preventDefault();
    });

    document.addEventListener('mousemove', (e) => {
      if (dragging) {
        terminal.style.left = (dragL + e.clientX - dragSX) + 'px';
        terminal.style.top  = (dragT + e.clientY - dragSY) + 'px';
      }
      if (resizing) doResize(e.clientX, e.clientY);
    });

    document.addEventListener('mouseup', () => {
      dragging = false;
      titlebar.style.cursor = 'grab';
      stopResize();
    });

    let resizing = false, resDir = '', resStart = {};

    document.querySelectorAll('.resize-handle').forEach(h => {
      h.addEventListener('mousedown', (e) => {
        if (winState === 'maximized') return;
        resizing = true;
        resDir   = h.dataset.dir;
        resStart = { mx: e.clientX, my: e.clientY,
                     left: terminal.offsetLeft, top: terminal.offsetTop,
                     width: terminal.offsetWidth, height: terminal.offsetHeight };
        document.body.style.cursor = getComputedStyle(h).cursor;
        e.preventDefault();
      });
    });

    function doResize(mx, my) {
      const dx = mx - resStart.mx, dy = my - resStart.my;
      let { left, top, width, height } = resStart;
      if (resDir.includes('e')) width  = Math.max(MIN_W, width  + dx);
      if (resDir.includes('s')) height = Math.max(MIN_H, height + dy);
      if (resDir.includes('w')) { const nw = Math.max(MIN_W, width-dx);  left  = left + width  - nw;  width  = nw; }
      if (resDir.includes('n')) { const nh = Math.max(MIN_H, height-dy); top   = top  + height - nh;  height = nh; }
      terminal.style.left   = left   + 'px';
      terminal.style.top    = top    + 'px';
      terminal.style.width  = width  + 'px';
      terminal.style.height = height + 'px';
    }

    function stopResize() {
      if (resizing) { resizing = false; document.body.style.cursor = ''; }
    }

    function updateClock() {
      const now = new Date();
      const hh = String(now.getHours()).padStart(2,'0');
      const mm = String(now.getMinutes()).padStart(2,'0');
      const days = ['Sun','Mon','Tue','Wed','Thu','Fri','Sat'];
      const months = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
      document.getElementById('tb-time').textContent = `${hh}:${mm}`;
      document.getElementById('tb-date').textContent =
        `${days[now.getDay()]} ${String(now.getDate()).padStart(2,'0')} ${months[now.getMonth()]}`;
    }
    updateClock();
    setInterval(updateClock, 10000);