GUI.NumberController = function() {

	this.type = "number";
    
    GUI.Controller.apply(this, arguments);
    
    var _this = this;
    
    // If we simply click and release a number field, we want to highlight it.
    // This variable keeps track of whether or not we've dragged
    var draggedNumberField = false;
    
    var clickedNumberField = false;
    
    var y = py = 0;
    
    var min = arguments[3];
    var max = arguments[4];
    var step = arguments[5];
    
    if (!step) {
    	if (min != undefined && max != undefined) {
    		step = (max-min)*0.01;
    	} else {
    		step = 1;
    	}	
    }
    
    var numberField = document.createElement('input');
    numberField.setAttribute('id', this.propertyName);
    numberField.setAttribute('type', 'text');
    numberField.setAttribute('value', this.getValue());
    
    if (step) numberField.setAttribute('step', step);
    
    this.domElement.appendChild(numberField);
    
    var slider;
    
    if (min != undefined && max != undefined) {
    	slider = new Slider(this, min, max, step, this.getValue());
    	this.domElement.appendChild(slider.domElement);
    }
    
    numberField.addEventListener('blur', function(e) {
        var val = parseFloat(this.value);
        if (!isNaN(val)) {
	        _this.updateDisplay();
        } else { 
        	this.value = _this.getValue();
        }
    }, false);
    
    numberField.addEventListener('mousewheel', function(e) {
    	e.preventDefault();
    	_this.setValue(_this.getValue() + Math.abs(e.wheelDeltaY)/e.wheelDeltaY*step);
    	return false;
    }, false);
    
    numberField.addEventListener('mousedown', function(e) {
        py = y = e.pageY;
		clickedNumberField = true;
        document.addEventListener('mousemove', dragNumberField, false);
    }, false);

	// Handle up arrow and down arrow
	numberField.addEventListener('keydown', function(e) {
		switch(e.keyCode) {
			case 38: 	// up
				var newVal = _this.getValue() + step;
				_this.setValue(newVal);
				break;
			case 40: 	// down
				var newVal = _this.getValue() - step;
				_this.setValue(newVal);
				break;
		}
	}, false);
    
    document.addEventListener('mouseup', function(e) {
        document.removeEventListener('mousemove', dragNumberField, false);
        GUI.makeSelectable(_this.parent.domElement); 
        GUI.makeSelectable(numberField);
        if (clickedNumberField && !draggedNumberField) { 
	        numberField.focus();
	        numberField.select();
        }
        draggedNumberField = false;
        clickedNumberField = false;
    }, false);
    
    
    var dragNumberField = function(e) {
    	draggedNumberField = true;
		e.preventDefault();

		// We don't want to be highlighting this field as we scroll.
		// Or any other fields in this gui for that matter ...
		// TODO: Make makeUselectable go through each element and child element.

		GUI.makeUnselectable(_this.parent.domElement);
		GUI.makeUnselectable(numberField);
		
		py = y;
		y = e.pageY;
		var dy = py - y;
		var newVal = _this.getValue() + dy*step;	
		_this.setValue(newVal);
		return false;
    }
    
    
    
    this.setValue = function(val) {
    
		val = parseFloat(val);
		
    	if (min != undefined && val <= min) {
    		val = min;
    	} else if (max != undefined && val >= max) { 
    		val = max;
    	}
    	
    	return GUI.Controller.prototype.setValue.call(this, val);
    	
    }
    
    this.updateDisplay = function() {
        numberField.value = GUI.roundToDecimal(_this.getValue(), 4);
        if (slider) slider.value = _this.getValue();
	}
};

GUI.extendController(GUI.NumberController);