/* =========================================================
 * bootstrap-slider.js v2.0.0
 * http://www.eyecon.ro/bootstrap-slider
 * =========================================================
 * Copyright 2012 Stefan Petre
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ========================================================= */
 
(function( $ ) {

	var ErrorMsgs = {
		formatInvalidInputErrorMsg : function(input) {
			return "Invalid input value '" + input + "' passed in";
		},
		callingContextNotSliderInstance : "Calling context element does not have instance of Slider bound to it. Check your code to make sure the JQuery object returned from the call to the slider() initializer is calling the method"
	};

	var Slider = function(element, options) {
		var el = this.element = $(element).hide();
		var origWidth = el.outerWidth();

		var updateSlider = false;
		var parent = this.element.parent();


		if (parent.hasClass('slider') === true) {
			updateSlider = true;
			this.picker = parent;
		} else {
			this.picker = $('<div class="slider">'+
								'<div class="slider-track">'+
									'<div class="slider-selection"></div>'+
									'<div class="slider-handle"></div>'+
									'<div class="slider-handle"></div>'+
								'</div>'+
								'<div class="tooltip"><div class="tooltip-arrow"></div><div class="tooltip-inner"></div></div>'+
							'</div>')
								.insertBefore(this.element)
								.append(this.element);
		}

		this.id = this.element.data('slider-id')||options.id;
		if (this.id) {
			this.picker[0].id = this.id;
		}

		if (typeof Modernizr !== 'undefined' && Modernizr.touch) {
			this.touchCapable = true;
		}

		var tooltip = this.element.data('slider-tooltip')||options.tooltip;

		this.tooltip = this.picker.find('.tooltip');
		this.tooltipInner = this.tooltip.find('div.tooltip-inner');

		this.orientation = this.element.data('slider-orientation')||options.orientation;
		switch(this.orientation) {
			case 'vertical':
				this.picker.addClass('slider-vertical');
				this.stylePos = 'top';
				this.mousePos = 'pageY';
				this.sizePos = 'offsetHeight';
				this.tooltip.addClass('right')[0].style.left = '100%';
				break;
			default:
				this.picker
					.addClass('slider-horizontal')
					.css('width', origWidth);
				this.orientation = 'horizontal';
				this.stylePos = 'left';
				this.mousePos = 'pageX';
				this.sizePos = 'offsetWidth';
				this.tooltip.addClass('top')[0].style.top = -this.tooltip.outerHeight() - 14 + 'px';
				break;
		}

		['min', 'max', 'step', 'value'].forEach(function(attr) {
            // the "|| 0" is used when the expression before it evaluates to an empty string (causes bad calculations in IE later on)
			this[attr] = el.data('slider-' + attr) || options[attr] || el.prop(attr) || 0;
		}, this);

		if (this.value instanceof Array) {
			this.range = true;
		}

		this.selection = this.element.data('slider-selection')||options.selection;
		this.selectionEl = this.picker.find('.slider-selection');
		if (this.selection === 'none') {
			this.selectionEl.addClass('hide');
		}

		this.selectionElStyle = this.selectionEl[0].style;

		this.handle1 = this.picker.find('.slider-handle:first');
		this.handle1Stype = this.handle1[0].style;
		this.handle2 = this.picker.find('.slider-handle:last');
		this.handle2Stype = this.handle2[0].style;

		var handle = this.element.data('slider-handle')||options.handle;
		switch(handle) {
			case 'round':
				this.handle1.addClass('round');
				this.handle2.addClass('round');
				break;
			case 'triangle':
				this.handle1.addClass('triangle');
				this.handle2.addClass('triangle');
				break;
		}

		if (this.range) {
			this.value[0] = Math.max(this.min, Math.min(this.max, this.value[0]));
			this.value[1] = Math.max(this.min, Math.min(this.max, this.value[1]));
		} else {
			this.value = [ Math.max(this.min, Math.min(this.max, this.value))];
			this.handle2.addClass('hide');
			if (this.selection === 'after') {
				this.value[1] = this.max;
			} else {
				this.value[1] = this.min;
			}
		}
		this.diff = this.max - this.min;
		this.percentage = [
			(this.value[0]-this.min)*100/this.diff,
			(this.value[1]-this.min)*100/this.diff,
			this.step*100/this.diff
		];

		this.offset = this.picker.offset();
		this.size = this.picker[0][this.sizePos];

		this.formater = options.formater;

		this.reversed = this.element.data('slider-reversed')||options.reversed;

		this.layout();

		if (this.touchCapable) {
			// Touch: Bind touch events:
			this.picker.on({
				touchstart: $.proxy(this.mousedown, this)
			});
		} else {
			this.picker.on({
				mousedown: $.proxy(this.mousedown, this)
			});
		}

		if(tooltip === 'hide') {
			this.tooltip.addClass('hide');
		} else if(tooltip === 'always') {
			this.showTooltip();
			this.alwaysShowTooltip = true;
		} else {
			this.picker.on({
				mouseenter: $.proxy(this.showTooltip, this),
				mouseleave: $.proxy(this.hideTooltip, this)
			});
		}

		if (updateSlider === true) {
			var old = this.getValue();
			var val = this.calculateValue();
			this.element
				.trigger({
					'type': 'slide',
					'value': val
				})
				.data('value', val)
				.prop('value', val);

			if (old !== val) {
				this.element
					.trigger({
						'type': 'slideChange',
						'new': val, // without a string literal, IE8 will interpret as the JS "new" keyword
						'old': old
					})
					.data('value', val)
					.prop('value', val);
			}
		}

		this.enabled = options.enabled && 
						(this.element.data('slider-enabled') === undefined || this.element.data('slider-enabled') === true);
		if(!this.enabled)
		{
			this.disable();
		}
	};

	Slider.prototype = {
		constructor: Slider,

		over: false,
		inDrag: false,
		
		showTooltip: function(){
			this.tooltip.addClass('in');
			this.over = true;
		},
		
		hideTooltip: function(){
			if (this.inDrag === false && this.alwaysShowTooltip !== true) {
				this.tooltip.removeClass('in');
			}
			this.over = false;
		},

		layout: function(){
			var positionPercentages;

			if(this.reversed) {
				positionPercentages = [ 100 - this.percentage[0], this.percentage[1] ];
			} else {
				positionPercentages = [ this.percentage[0], this.percentage[1] ];
			}

			this.handle1Stype[this.stylePos] = positionPercentages[0]+'%';
			this.handle2Stype[this.stylePos] = positionPercentages[1]+'%';

			if (this.orientation === 'vertical') {
				this.selectionElStyle.top = Math.min(positionPercentages[0], positionPercentages[1]) +'%';
				this.selectionElStyle.height = Math.abs(positionPercentages[0] - positionPercentages[1]) +'%';
			} else {
				this.selectionElStyle.left = Math.min(positionPercentages[0], positionPercentages[1]) +'%';
				this.selectionElStyle.width = Math.abs(positionPercentages[0] - positionPercentages[1]) +'%';
			}

			if (this.range) {
				this.tooltipInner.text(
					this.formater(this.value[0]) + ' : ' + this.formater(this.value[1])
				);
				this.tooltip[0].style[this.stylePos] = this.size * (positionPercentages[0] + (positionPercentages[1] - positionPercentages[0])/2)/100 - (this.orientation === 'vertical' ? this.tooltip.outerHeight()/2 : this.tooltip.outerWidth()/2) +'px';
			} else {
				this.tooltipInner.text(
					this.formater(this.value[0])
				);
				this.tooltip[0].style[this.stylePos] = this.size * positionPercentages[0]/100 - (this.orientation === 'vertical' ? this.tooltip.outerHeight()/2 : this.tooltip.outerWidth()/2) +'px';
			}
		},

		mousedown: function(ev) {
			if(!this.isEnabled()) {
				return false;
			}
			// Touch: Get the original event:
			if (this.touchCapable && ev.type === 'touchstart') {
				ev = ev.originalEvent;
			}

			this.offset = this.picker.offset();
			this.size = this.picker[0][this.sizePos];

			var percentage = this.getPercentage(ev);

			if (this.range) {
				var diff1 = Math.abs(this.percentage[0] - percentage);
				var diff2 = Math.abs(this.percentage[1] - percentage);
				this.dragged = (diff1 < diff2) ? 0 : 1;
			} else {
				this.dragged = 0;
			}

			this.percentage[this.dragged] = this.reversed ? 100 - percentage : percentage;
			this.layout();

			if (this.touchCapable) {
				// Touch: Bind touch events:
				$(document).on({
					touchmove: $.proxy(this.mousemove, this),
					touchend: $.proxy(this.mouseup, this)
				});
			} else {
				$(document).on({
					mousemove: $.proxy(this.mousemove, this),
					mouseup: $.proxy(this.mouseup, this)
				});
			}

			this.inDrag = true;
			var val = this.calculateValue();
			this.setValue(val);
			this.element.trigger({
					type: 'slideStart',
					value: val
				}).trigger({
					type: 'slide',
					value: val
				});
			return false;
		},

		mousemove: function(ev) {
			if(!this.isEnabled()) {
				return false;
			}
			// Touch: Get the original event:
			if (this.touchCapable && ev.type === 'touchmove') {
				ev = ev.originalEvent;
			}

			var percentage = this.getPercentage(ev);
			if (this.range) {
				if (this.dragged === 0 && this.percentage[1] < percentage) {
					this.percentage[0] = this.percentage[1];
					this.dragged = 1;
				} else if (this.dragged === 1 && this.percentage[0] > percentage) {
					this.percentage[1] = this.percentage[0];
					this.dragged = 0;
				}
			}
			this.percentage[this.dragged] = this.reversed ? 100 - percentage : percentage;
			this.layout();
			var val = this.calculateValue();
			this.setValue(val);
			this.element
				.trigger({
					type: 'slide',
					value: val
				})
				.data('value', val)
				.prop('value', val);
			return false;
		},

		mouseup: function() {
			if(!this.isEnabled()) {
				return false;
			}
			if (this.touchCapable) {
				// Touch: Bind touch events:
				$(document).off({
					touchmove: this.mousemove,
					touchend: this.mouseup
				});
			} else {
				$(document).off({
					mousemove: this.mousemove,
					mouseup: this.mouseup
				});
			}

			this.inDrag = false;
			if (this.over === false) {
				this.hideTooltip();
			}
			var val = this.calculateValue();
			this.layout();
			this.element
				.data('value', val)
				.prop('value', val)
				.trigger({
					type: 'slideStop',
					value: val
				});
			return false;
		},

		calculateValue: function() {
			var val;
			if (this.range) {
				val = [
					(Math.max(this.min, this.min + Math.round((this.diff * this.percentage[0]/100)/this.step)*this.step)),
					(Math.min(this.max, this.min + Math.round((this.diff * this.percentage[1]/100)/this.step)*this.step))
				];
				this.value = val;
			} else {
				val = (this.min + Math.round((this.diff * this.percentage[0]/100)/this.step)*this.step);
				if (val < this.min) {
					val = this.min;
				}
				else if (val > this.max) {
					val = this.max;
				}
				val = parseFloat(val);
				this.value = [val, this.value[1]];
			}
			return val;
		},

		getPercentage: function(ev) {
			if (this.touchCapable) {
				ev = ev.touches[0];
			}
			var percentage = (ev[this.mousePos] - this.offset[this.stylePos])*100/this.size;
			percentage = Math.round(percentage/this.percentage[2])*this.percentage[2];
			return Math.max(0, Math.min(100, percentage));
		},

		getValue: function() {
			if (this.range) {
				return this.value;
			}
			return this.value[0];
		},

		setValue: function(val) {
			this.value = this.validateInputValue(val);

			if (this.range) {
				this.value[0] = Math.max(this.min, Math.min(this.max, this.value[0]));
				this.value[1] = Math.max(this.min, Math.min(this.max, this.value[1]));
			} else {
				this.value = [ Math.max(this.min, Math.min(this.max, this.value))];
				this.handle2.addClass('hide');
				if (this.selection === 'after') {
					this.value[1] = this.max;
				} else {
					this.value[1] = this.min;
				}
			}
			this.diff = this.max - this.min;
			this.percentage = [
				(this.value[0]-this.min)*100/this.diff,
				(this.value[1]-this.min)*100/this.diff,
				this.step*100/this.diff
			];
			this.layout();
		},

		validateInputValue : function(val) {
			if(typeof val === 'number') {
				return val;
			} else if(val instanceof Array) {
				val.forEach(function(input) { if (typeof input !== 'number') { throw new Error( ErrorMsgs.formatInvalidInputErrorMsg(input) ); }});
				return val;
			} else {
				throw new Error( ErrorMsgs.formatInvalidInputErrorMsg(val) );
			}
		},

		destroy: function(){
			this.element.show().insertBefore(this.picker);
			this.picker.remove();
			$(this.element).removeData('slider');
			$(this.element).off();
		},

		disable: function() {
			this.enabled = false;
			this.picker.addClass('slider-disabled');
			this.element.trigger('slideDisabled');
		},

		enable: function() {
			this.enabled = true;
			this.picker.removeClass('slider-disabled');
			this.element.trigger('slideEnabled');
		},

		toggle: function() {
			if(this.enabled) {
				this.disable();
			} else {
				this.enable();
			}
		},

		isEnabled: function() {
			return this.enabled;
		}
	};

	var publicMethods = {
		getValue : Slider.prototype.getValue,
		setValue : Slider.prototype.setValue,
		destroy : Slider.prototype.destroy,
		disable : Slider.prototype.disable,
		enable : Slider.prototype.enable,
		toggle : Slider.prototype.toggle,
		isEnabled: Slider.prototype.isEnabled
	};

	$.fn.slider = function (option) {
		if (typeof option === 'string') {
			var args = Array.prototype.slice.call(arguments, 1);
			return invokePublicMethod.call(this, option, args);
		} else {
			return createNewSliderInstance.call(this, option);
		}
	};

	function invokePublicMethod(methodName, args) {
		if(publicMethods[methodName]) {
			var sliderObject = retrieveSliderObjectFromElement(this);
			return publicMethods[methodName].apply(sliderObject, args);
		} else {
			throw new Error("method '" + methodName + "()' does not exist for slider.");
		}
	}

	function retrieveSliderObjectFromElement(element) {
		var sliderObject = $(element).data('slider');
		if(sliderObject && sliderObject instanceof Slider) {
			return sliderObject;
		} else {
			throw new Error(ErrorMsgs.callingContextNotSliderInstance);
		}
	}

	function createNewSliderInstance(opts) {
		var $this = $(this),
			data = $this.data('slider'),
			options = typeof opts === 'object' && opts;
		if (!data)  {
			$this.data('slider', (data = new Slider(this, $.extend({}, $.fn.slider.defaults,options))));
		}
		return $this;
	}

	$.fn.slider.defaults = {
		min: 0,
		max: 10,
		step: 1,
		orientation: 'horizontal',
		value: 5,
		selection: 'before',
		tooltip: 'show',
		handle: 'round',
		reversed : false,
		enabled: true,
		formater: function(value) {
			return value;
		}
	};

	$.fn.slider.Constructor = Slider;

})( window.jQuery );
