(function(){
  if(window._toolbar) return;
  window._toolbar=true;

  var css=document.createElement('style');
  css.textContent=`
    #mb{display:none;position:fixed;bottom:0;left:0;right:0;background:#111;
      border-top:2px solid #D35400;padding:5px 4px;gap:4px;justify-content:center;
      flex-wrap:wrap;z-index:99999}
    #mb button{background:#222;color:#ccc;border:1px solid #444;border-radius:5px;
      padding:10px 12px;font-size:14px;font-family:ui-monospace,monospace;
      cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent;
      min-width:42px;text-align:center;user-select:none}
    #mb button:active{background:#D35400;color:#0a0a0a;border-color:#D35400}
    #mb button.hi{border-color:#D35400;color:#D35400}
    #mb button.on{background:#D35400;color:#0a0a0a;border-color:#D35400}
    #mb .sep{width:1px;background:#333;margin:0 2px;align-self:stretch}
    @media(max-width:900px){#mb{display:flex}}
    body.selmode .xterm-screen{pointer-events:none!important;
      user-select:text!important;-webkit-user-select:text!important}
  `;
  document.head.appendChild(css);

  var bar=document.createElement('div');
  bar.id='mb';
  bar.innerHTML=
    '<button class="hi" data-k="\\x01c">+Tab</button>'+
    '<button data-k="\\x01n">Next</button>'+
    '<button data-k="\\x01p">Prev</button>'+
    '<div class="sep"></div>'+
    '<button data-k="\\x03">^C</button>'+
    '<button data-k="\\x04">^D</button>'+
    '<button data-k="\\x0c">Clr</button>'+
    '<div class="sep"></div>'+
    '<button data-k="\\x1b">Esc</button>'+
    '<button data-k="\\t">Tab</button>'+
    '<button data-k="\\x1bOA">\u25B2</button>'+
    '<button data-k="\\x1bOB">\u25BC</button>'+
    '<div class="sep"></div>'+
    '<button class="hi" id="selbtn" data-sel="1">Sel</button>'+
    '<button data-k="\\x01v">V.Spl</button>'+
    '<button data-k="\\x01s">H.Spl</button>'+
    '<button data-k="\\x01o">Pane</button>'+
    '<button data-k="\\x01x">Kill</button>';
  document.body.appendChild(bar);

  function send(k){
    if(document.body.classList.contains('selmode')) toggleSel();
    k=k.replace(/\\x([0-9a-f]{2})/gi,function(_,h){return String.fromCharCode(parseInt(h,16));});
    k=k.replace(/\\t/g,'\t');
    if(window.term){window.term.input(k);window.term.focus();}
  }

  function toggleSel(){
    var b=document.getElementById('selbtn');
    document.body.classList.toggle('selmode');
    if(document.body.classList.contains('selmode')){
      b.classList.add('on');b.textContent='Done';
    } else {
      b.classList.remove('on');b.textContent='Sel';
      window.getSelection().removeAllRanges();
      if(window.term) window.term.focus();
    }
  }

  bar.addEventListener('click',function(e){
    var btn=e.target.closest('button');
    if(!btn) return;
    if(btn.dataset.sel) return toggleSel();
    if(btn.dataset.k) send(btn.dataset.k);
  });

  // Shrink terminal for toolbar on mobile
  var obs=new MutationObserver(function(){
    var el=document.querySelector('.xterm');
    if(el && window.innerWidth<=900){
      el.style.height='calc(100vh - 54px)';
      if(window.term && window.term.fit) window.term.fit();
    }
  });
  obs.observe(document.body,{childList:true,subtree:true});
})();