/* =========================================================
 * 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";
		}
	};

	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() - 8 + 'px';
				break;
		}

		['min', 'max', 'step', 'value'].forEach(function(attr) {
			this[attr] = el.data('slider-' + attr) || options[attr] || el.prop(attr);
		}, 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 === 'show') {
			this.picker.on({
				mouseenter: $.proxy(this.showTooltip, this),
				mouseleave: $.proxy(this.hideTooltip, this)
			});
		} else {
			this.tooltip.addClass('hide');
		}

		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,
						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.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
				.trigger({
					type: 'slideStop',
					value: val
				})
				.data('value', val)
				.prop('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 = $(this).data('slider');
			return publicMethods[methodName].apply(sliderObject, args);
		} else {
			throw new Error("method '" + methodName + "()' does not exist for slider.");
		}
	}

	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 );
