// ==UserScript==

// @name          GWS (Mobile)

// @description   Mobile GWS Script

// @author        Charles L. Chen

// @include       http://www.google.com/m?*

// ==/UserScript==



var inputFocused = false;



var resultElems = new Array();

var resultsIdx = -1;



function buildResultElems(){

  resultElems = new Array();

  var resNode = document.getElementById("universal");

  var medNodes = resNode.getElementsByClassName("med");

  if (medNodes.length > 0){

//    resultElems.push(medNodes[0]);

  }

  var gNodes = resNode.getElementsByClassName("result");

  for (var i=0, gNode; gNode = gNodes[i]; i++){

    resultElems.push(gNode);

  }

}





function getNextResult(){

  if (resultElems.length < 1){

    return null;

  }

  resultsIdx++;

  if (resultsIdx > resultElems.length - 1){

    resultsIdx = 0;

    return null;

  }

  var elem = resultElems[resultsIdx];

  return elem;

}



function getPrevResult(){

  if (resultElems.length < 1){

    return null;

  }

  resultsIdx--;

  if (resultsIdx < 0){

    resultsIdx = resultElems.length - 1;

    return null;

  }

  var elem = resultElems[resultsIdx];

  return elem;

}





function scrollToElem(targetNode){

  while (!targetNode.offsetParent){

    targetNode = targetNode.parentNode;

  }

  var left = 0;

  var top = 0;

  while (targetNode.offsetParent) { 

    left += targetNode.offsetLeft;

    top += targetNode.offsetTop; 

    targetNode = targetNode.offsetParent;

  }

  left += targetNode.offsetLeft;

  top += targetNode.offsetTop;

  window.scrollTo(left, top);

}



function applyLens(targetNode){

  var lensNode = document.getElementById("CVOX_LENS");

  if (!lensNode){

    lensNode = document.createElement('span');

	lensNode.id = "CVOX_LENS";

    lensNode.style.backgroundColor = '#CCE6FF';

    lensNode.style.borderColor = '#0000CC';

    lensNode.style.borderWidth = 'medium';

    lensNode.style.borderStyle = 'groove';

    lensNode.style.position = 'absolute';

    lensNode.style.display = 'none';

    document.body.appendChild(lensNode);

  }

  while (lensNode.firstChild){

    lensNode.removeChild(lensNode.firstChild);

  }

  if (targetNode === null) {

    lensNode.style.display = 'none';

    return;

  }

  var left = 0;

  var top = 0;

  var obj = targetNode;

  if (obj.offsetParent) {

    left = obj.offsetLeft;

    top = obj.offsetTop;

    obj = obj.offsetParent;

    while (obj !== null) {

      left += obj.offsetLeft;

      top += obj.offsetTop;

      obj = obj.offsetParent;

    }

  }

  lensNode.appendChild(targetNode.cloneNode(true));

  lensNode.style.top = top + 'px';

  lensNode.style.left = left + 'px';

  lensNode.style.zIndex = 999;

  lensNode.style.display = 'block';



  var adjustment = (1.3 * 100) + '%';

  lensNode.style.setProperty('font-size', adjustment, 'important');

  var subnodes = lensNode.getElementsByTagName('*');

  for (var i = 0, node; node = subnodes[i]; i++){

    node.style.setProperty('line-height', 'normal', 'important');

    node.style.setProperty('font-size', '100%', 'important');

  }



  

  scrollToElem(lensNode);

}









function speak(textStr, queueMode, paramsArray){

  window.ttsHelper.speak(textStr, queueMode);

  //alert(textStr);

}



//TODO: Come up with a working escape sequence!

function keyPressHandler(evt){

  var keyCode = evt.keyCode;

  if (inputFocused){

    return true;

  }

  if (keyCode == 106) { // j

    readNextResult();

    return false;

  }

  if (keyCode == 107) { // k

    var resultNode = getPrevResult();

    if (resultNode){

      speak(resultNode.textContent,0,null);

	    applyLens(resultNode);

    }

    return false;

  }

  return true;

}



function keyDownHandler(evt){

  window.ttsHelper.stop();

  var keyCode = evt.keyCode;

  if (inputFocused){

    return true;

  }

  if ((keyCode == 32) || (keyCode == 13)) { // space or Enter (G1 enter key does not work)

    var elem = resultElems[resultsIdx];

    var links = elem.getElementsByTagName('A');

    document.location = links[0].href;

    return false;

  }  

  return true;

}



function focusHandler(evt){

  if (evt.target.tagName && 

      evt.target.tagName == 'INPUT'){

      inputFocused = true;

      }

  return true;

}



function blurHandler(evt){

  inputFocused = false;

  return true;

}



function readNextResult(){

  var resultNode = getNextResult();

  if (resultNode){

    speak(resultNode.textContent,0,null);

	  applyLens(resultNode);

  }

}



document.addEventListener('keypress', keyPressHandler, true);

document.addEventListener('keydown', keyDownHandler, true);

document.addEventListener('focus', focusHandler, true);

document.addEventListener('blur', blurHandler, true);





buildResultElems();

readNextResult();