function fetchText(delay, repeat) {
  var el = $("#console");
  if (el.textEnd == undefined) {
    el.textEnd = 0;
    el.innerHTML = "";
  }
  window.setTimeout(function() {
    ajaxJson('GET', console_url + "?start=" + el.textEnd,
      function(resp) {
        var dly = updateText(resp);
        if (repeat) fetchText(dly, repeat);
      },
      function() { retryLoad(repeat); });
  }, delay);
}

function updateText(resp) {
  var el = $("#console");

  var delay = 3000;
  if (resp != null && resp.len > 0) {
    console.log("updateText got", resp.len, "chars at", resp.start);
    if (resp.start > el.textEnd) {
      el.innerHTML = el.innerHTML.concat("\r\n<missing lines\r\n");
    }
    el.innerHTML = el.innerHTML.concat(resp.text);
    el.textEnd = resp.start + resp.len;
    delay = 500;
  }
  return delay;
}

function retryLoad(repeat) {
  fetchText(1000, repeat);
}

//===== Console page

function showRate(rate) {
  rates.forEach(function(r) {
    var el = $("#"+r+"-button");
    el.className = el.className.replace(" button-selected", "");
  });

  var el = $("#"+rate+"-button");
  if (el != null) el.className += " button-selected";
}

function baudButton(baud) {
  $("#baud-btns").appendChild(m(
    ' <a id="'+baud+'-button" href="#" class="pure-button">'+baud+'</a>'));

  $("#"+baud+"-button").addEventListener("click", function(e) {
    e.preventDefault();
    ajaxSpin('POST', "/console/baud?rate="+baud,
      function(resp) { showNotification("" + baud + " baud set"); showRate(baud); },
      function(s, st) { showWarning("Error setting baud rate: " + st); }
    );
  });
}

function consoleSendInit() {
  var sendHistory = $("#send-history");
  var inputText = $("#input-text");
  var inputAddCr = $("#input-add-cr");
  var inputAddLf = $("#input-add-lf");
  
  function findHistory(text) {
    for (var i = 0; i < sendHistory.children.length; i++) {
      if (text == sendHistory.children[i].value) {
        return i;
      }
    }
    return null;
  }

  function loadHistory(idx) {
    sendHistory.value = sendHistory.children[idx].value;
    inputText.value = sendHistory.children[idx].value;
  }

  function navHistory(rel) {
    var idx = findHistory(sendHistory.value) + rel;
    if (idx < 0) {
      idx = sendHistory.children.length - 1;
    }
    if (idx >= sendHistory.children.length) {
      idx = 0;
    }
    loadHistory(idx);
  }

  sendHistory.addEventListener("change", function(e) {
    inputText.value = sendHistory.value;
  });

  function pushHistory(text) {
    var idx = findHistory(text);
    if (idx !== null) {
      loadHistory(idx);
      return false;
    }
    var newOption = m('<option>'+
      (text
       .replace(/&/g, '&amp;')
       .replace(/</g, '&lt;')
       .replace(/>/g, '&gt;')
       .replace(/"/g, '&quot;'))
                     +'</option>');
    newOption.value = text;
    sendHistory.appendChild(newOption);
    sendHistory.value = text;
    for (; sendHistory.children.length > 15; ) {
      sendHistory.removeChild(sendHistory.children[0]);
    }
    return true;
  }

  inputText.addEventListener("keydown", function(e) {
    switch (e.keyCode) {
      case 38: /* the up arrow key pressed */
      e.preventDefault();
      navHistory(-1);
      break;
      case 40: /* the down arrow key pressed */
      e.preventDefault();
      navHistory(+1);
      break;
      case 27: /* the escape key pressed */
      e.preventDefault();
      inputText.value = "";
      sendHistory.value = "";
      break;
      case 13: /* the enter key pressed */
      e.preventDefault();
      var text = inputText.value;
      if (inputAddCr.checked) text += '\r';
      if (inputAddLf.checked) text += '\n';
      ajaxSpin('POST', "/console/send?text=" + encodeURIComponent(text),
        function(resp) { showNotification("uC sent"); pushHistory(inputText.value); },
        function(s, st) { showWarning("Error sending text to uC"); }
      );
      break;
    }
  });
}

//===== Log page

function showDbgMode(mode) {
  var btns = $('.dbg-btn');
  for (var i=0; i < btns.length; i++) {
    if (btns[i].id === "dbg-"+mode)
      addClass(btns[i], "button-selected");
    else
      removeClass(btns[i], "button-selected");
  }
}