/*
 * jQuery UI Slider
 *
 * Copyright (c) 2008 Paul Bakaus
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Slider
 *
 * Depends:
 *       ui.core.js
 */
(function($) {

$.fn.unwrap = $.fn.unwrap || function(expr) {
  return this.each(function(){
     $(this).parents(expr).eq(0).after(this).remove();
  });
};

$.widget("ui.slider", {
       plugins: {},
       ui: function(e) {
              return {
                     options: this.options,
                     handle: this.currentHandle,
                     value: this.options.axis != "both" || !this.options.axis ? Math.round(this.value(null,this.options.axis == "vertical" ? "y" : "x")) : {
                            x: Math.round(this.value(null,"x")),
                            y: Math.round(this.value(null,"y"))
                     },
                     range: this.getRange()
              };
       },
       propagate: function(n,e) {
              $.ui.plugin.call(this, n, [e, this.ui()]);
              this.element.triggerHandler(n == "slide" ? n : "slide"+n, [e, this.ui()], this.options[n]);
       },
       destroy: function() {
              
              this.element
                     .removeClass("ui-slider ui-slider-disabled")
                     .removeData("slider")
                     .unbind(".slider");
              
              if(this.handle && this.handle.length) {
                     this.handle
                            .unwrap("a");
                     this.handle.each(function() {
                            $(this).data("mouse").mouseDestroy();
                     });
              }
              
              this.generated && this.generated.remove();
              
       },
       setData: function(key, value) {
              $.widget.prototype.setData.apply(this, arguments);
              if (/min|max|steps/.test(key)) {
                     this.initBoundaries();
              }
              
              if(key == "range") {
                     value ? this.handle.length == 2 && this.createRange() : this.removeRange();
              }
              
       },

       init: function() {
              
              var self = this;
              this.element.addClass("ui-slider");
              this.initBoundaries();
              
              // Initialize mouse and key events for interaction
              this.handle = $(this.options.handle, this.element);
              if (!this.handle.length) {
                     self.handle = self.generated = $(self.options.handles || [0]).map(function() {
                            var handle = $("<div/>").addClass("ui-slider-handle").appendTo(self.element);
                            if (this.id)
                                   handle.attr("id", this.id);
                            return handle[0];
                     });
              }
              
              
              var handleclass = function(el) {
                     this.element = $(el);
                     this.element.data("mouse", this);
                     this.options = self.options;
                     
                     this.element.bind("mousedown", function() {
                            if(self.currentHandle) this.blur(self.currentHandle);
                            self.focus(this,1);
                     });
                     
                     this.mouseInit();
              };
              
              $.extend(handleclass.prototype, $.ui.mouse, {
                     mouseStart: function(e) { return self.start.call(self, e, this.element[0]); },
                     mouseStop: function(e) { return self.stop.call(self, e, this.element[0]); },
                     mouseDrag: function(e) { return self.drag.call(self, e, this.element[0]); },
                     mouseCapture: function() { return true; },
                     trigger: function(e) { this.mouseDown(e); }
              });
              
              
              $(this.handle)
                     .each(function() {
                            new handleclass(this);
                     })
                     .wrap('<a href="javascript:void(0)" style="cursor:default;"></a>')
                     .parent()
                            .bind('focus', function(e) { self.focus(this.firstChild); })
                            .bind('blur', function(e) { self.blur(this.firstChild); })
                            .bind('keydown', function(e) { if(!self.options.noKeyboard) self.keydown(e.keyCode, this.firstChild); })
              ;
              
              // Bind the click to the slider itself
              this.element.bind('mousedown.slider', function(e) {
                     self.click.apply(self, [e]);
                     self.currentHandle.data("mouse").trigger(e);
                     self.firstValue = self.firstValue + 1; //This is for always triggering the change event
              });
              
              // Move the first handle to the startValue
              $.each(this.options.handles || [], function(index, handle) {
                     self.moveTo(handle.start, index, true);
              });
              if (!isNaN(this.options.startValue))
                     this.moveTo(this.options.startValue, 0, true);

              this.previousHandle = $(this.handle[0]); //set the previous handle to the first to allow clicking before selecting the handle
              if(this.handle.length == 2 && this.options.range) this.createRange();
       },
       initBoundaries: function() {
              
              var element = this.element[0], o = this.options;
              this.actualSize = { width: this.element.outerWidth() , height: this.element.outerHeight() };
              
              $.extend(o, {
                     axis: o.axis || (element.offsetWidth < element.offsetHeight ? 'vertical' : 'horizontal'),
                     max: !isNaN(parseInt(o.max,10)) ? { x: parseInt(o.max, 10), y: parseInt(o.max, 10) } : ({ x: o.max && o.max.x || 100, y: o.max && o.max.y || 100 }),
                     min: !isNaN(parseInt(o.min,10)) ? { x: parseInt(o.min, 10), y: parseInt(o.min, 10) } : ({ x: o.min && o.min.x || 0, y: o.min && o.min.y || 0 })
              });
              //Prepare the real maxValue
              o.realMax = {
                     x: o.max.x - o.min.x,
                     y: o.max.y - o.min.y
              };
              //Calculate stepping based on steps
              o.stepping = {
                     x: o.stepping && o.stepping.x || parseInt(o.stepping, 10) || (o.steps ? o.realMax.x/(o.steps.x || parseInt(o.steps, 10) || o.realMax.x) : 0),
                     y: o.stepping && o.stepping.y || parseInt(o.stepping, 10) || (o.steps ? o.realMax.y/(o.steps.y || parseInt(o.steps, 10) || o.realMax.y) : 0)
              };
       },

       
       keydown: function(keyCode, handle) {
              if(/(37|38|39|40)/.test(keyCode)) {
                     this.moveTo({
                            x: /(37|39)/.test(keyCode) ? (keyCode == 37 ? '-' : '+') + '=' + this.oneStep("x") : 0,
                            y: /(38|40)/.test(keyCode) ? (keyCode == 38 ? '-' : '+') + '=' + this.oneStep("y") : 0
                     }, handle);
              }
       },
       focus: function(handle,hard) {
              this.currentHandle = $(handle).addClass('ui-slider-handle-active');
              if (hard)
                     this.currentHandle.parent()[0].focus();
       },
       blur: function(handle) {
              $(handle).removeClass('ui-slider-handle-active');
              if(this.currentHandle && this.currentHandle[0] == handle) { this.previousHandle = this.currentHandle; this.currentHandle = null; };
       },
       click: function(e) {
              // This method is only used if:
              // - The user didn't click a handle
              // - The Slider is not disabled
              // - There is a current, or previous selected handle (otherwise we wouldn't know which one to move)
              
              var pointer = [e.pageX,e.pageY];
              
              var clickedHandle = false;
              this.handle.each(function() {
                     if(this == e.target)
                            clickedHandle = true;
              });
              if (clickedHandle || this.options.disabled || !(this.currentHandle || this.previousHandle))
                     return;

              // If a previous handle was focussed, focus it again
              if (!this.currentHandle && this.previousHandle)
                     this.focus(this.previousHandle, true);
              
              // propagate only for distance > 0, otherwise propagation is done my drag
              this.offset = this.element.offset();

              this.moveTo({
                     y: this.convertValue(e.pageY - this.offset.top - this.currentHandle[0].offsetHeight/2, "y"),
                     x: this.convertValue(e.pageX - this.offset.left - this.currentHandle[0].offsetWidth/2, "x")
              }, null, !this.options.distance);
       },
       


       createRange: function() {
              if(this.rangeElement) return;
              this.rangeElement = $('<div></div>')
                     .addClass('ui-slider-range')
                     .css({ position: 'absolute' })
                     .appendTo(this.element);
              this.updateRange();
       },
       removeRange: function() {
              this.rangeElement.remove();
              this.rangeElement = null;
       },
       updateRange: function() {
                     var prop = this.options.axis == "vertical" ? "top" : "left";
                     var size = this.options.axis == "vertical" ? "height" : "width";
                     this.rangeElement.css(prop, (parseInt($(this.handle[0]).css(prop),10) || 0) + this.handleSize(0, this.options.axis == "vertical" ? "y" : "x")/2);
                     this.rangeElement.css(size, (parseInt($(this.handle[1]).css(prop),10) || 0) - (parseInt($(this.handle[0]).css(prop),10) || 0));
       },
       getRange: function() {
              return this.rangeElement ? this.convertValue(parseInt(this.rangeElement.css(this.options.axis == "vertical" ? "height" : "width"),10), this.options.axis == "vertical" ? "y" : "x") : null;
       },

       handleIndex: function() {
              return this.handle.index(this.currentHandle[0]);
       },
       value: function(handle, axis) {
              if(this.handle.length == 1) this.currentHandle = this.handle;
              if(!axis) axis = this.options.axis == "vertical" ? "y" : "x";

              var curHandle = $(handle != undefined && handle !== null ? this.handle[handle] || handle : this.currentHandle);
              
              if(curHandle.data("mouse").sliderValue) {
                     return parseInt(curHandle.data("mouse").sliderValue[axis],10);
              } else {
                     return parseInt(((parseInt(curHandle.css(axis == "x" ? "left" : "top"),10) / (this.actualSize[axis == "x" ? "width" : "height"] - this.handleSize(handle,axis))) * this.options.realMax[axis]) + this.options.min[axis],10);
              }

       },
       convertValue: function(value,axis) {
              return this.options.min[axis] + (value / (this.actualSize[axis == "x" ? "width" : "height"] - this.handleSize(null,axis))) * this.options.realMax[axis];
       },
       
       translateValue: function(value,axis) {
              return ((value - this.options.min[axis]) / this.options.realMax[axis]) * (this.actualSize[axis == "x" ? "width" : "height"] - this.handleSize(null,axis));
       },
       translateRange: function(value,axis) {
              if (this.rangeElement) {
                     if (this.currentHandle[0] == this.handle[0] && value >= this.translateValue(this.value(1),axis))
                            value = this.translateValue(this.value(1,axis) - this.oneStep(axis), axis);
                     if (this.currentHandle[0] == this.handle[1] && value <= this.translateValue(this.value(0),axis))
                            value = this.translateValue(this.value(0,axis) + this.oneStep(axis), axis);
              }
              if (this.options.handles) {
                     var handle = this.options.handles[this.handleIndex()];
                     if (value < this.translateValue(handle.min,axis)) {
                            value = this.translateValue(handle.min,axis);
                     } else if (value > this.translateValue(handle.max,axis)) {
                            value = this.translateValue(handle.max,axis);
                     }
              }
              return value;
       },
       translateLimits: function(value,axis) {
              if (value >= this.actualSize[axis == "x" ? "width" : "height"] - this.handleSize(null,axis))
                     value = this.actualSize[axis == "x" ? "width" : "height"] - this.handleSize(null,axis);
              if (value <= 0)
                     value = 0;
              return value;
       },
       handleSize: function(handle,axis) {
              return $(handle != undefined && handle !== null ? this.handle[handle] : this.currentHandle)[0]["offset"+(axis == "x" ? "Width" : "Height")];       
       },
       oneStep: function(axis) {
              return this.options.stepping[axis] || 1;
       },


       start: function(e, handle) {
       
              var o = this.options;
              if(o.disabled) return false;

              // Prepare the outer size
              this.actualSize = { width: this.element.outerWidth() , height: this.element.outerHeight() };
       
              // This is a especially ugly fix for strange blur events happening on mousemove events
              if (!this.currentHandle)
                     this.focus(this.previousHandle, true); 

              this.offset = this.element.offset();
              
              this.handleOffset = this.currentHandle.offset();
              this.clickOffset = { top: e.pageY - this.handleOffset.top, left: e.pageX - this.handleOffset.left };
              
              this.firstValue = this.value();
              
              this.propagate('start', e);
              this.drag(e, handle);
              return true;
                                   
       },
       stop: function(e) {
              this.propagate('stop', e);
              if (this.firstValue != this.value())
                     this.propagate('change', e);
              // This is a especially ugly fix for strange blur events happening on mousemove events
              this.focus(this.currentHandle, true);
              return false;
       },
       drag: function(e, handle) {

              var o = this.options;
              var position = { top: e.pageY - this.offset.top - this.clickOffset.top, left: e.pageX - this.offset.left - this.clickOffset.left};
              if(!this.currentHandle) this.focus(this.previousHandle, true); //This is a especially ugly fix for strange blur events happening on mousemove events

              position.left = this.translateLimits(position.left, "x");
              position.top = this.translateLimits(position.top, "y");
              
              if (o.stepping.x) {
                     var value = this.convertValue(position.left, "x");
                     value = Math.round(value / o.stepping.x) * o.stepping.x;
                     position.left = this.translateValue(value, "x");       
              }
              if (o.stepping.y) {
                     var value = this.convertValue(position.top, "y");
                     value = Math.round(value / o.stepping.y) * o.stepping.y;
                     position.top = this.translateValue(value, "y");       
              }
              
              position.left = this.translateRange(position.left, "x");
              position.top = this.translateRange(position.top, "y");

              if(o.axis != "vertical") this.currentHandle.css({ left: position.left });
              if(o.axis != "horizontal") this.currentHandle.css({ top: position.top });
              
              //Store the slider's value
              this.currentHandle.data("mouse").sliderValue = {
                     x: Math.round(this.convertValue(position.left, "x")) || 0,
                     y: Math.round(this.convertValue(position.top, "y")) || 0
              };
              
              if (this.rangeElement)
                     this.updateRange();
              this.propagate('slide', e);
              return false;
       },
       
       moveTo: function(value, handle, noPropagation) {

              var o = this.options;

              // Prepare the outer size
              this.actualSize = { width: this.element.outerWidth() , height: this.element.outerHeight() };

              //If no handle has been passed, no current handle is available and we have multiple handles, return false
              if (handle == undefined && !this.currentHandle && this.handle.length != 1)
                     return false; 
              
              //If only one handle is available, use it
              if (handle == undefined && !this.currentHandle)
                     handle = 0;
              
              if (handle != undefined)
                     this.currentHandle = this.previousHandle = $(this.handle[handle] || handle);


              if(value.x !== undefined && value.y !== undefined) {
                     var x = value.x, y = value.y;
              } else {
                     var x = value, y = value;
              }

              if(x !== undefined && x.constructor != Number) {
                     var me = /^\-\=/.test(x), pe = /^\+\=/.test(x);
                     if(me || pe) {
                            x = this.value(null, "x") + parseInt(x.replace(me ? '=' : '+=', ''), 10);
                     } else {
                            x = isNaN(parseInt(x, 10)) ? undefined : parseInt(x, 10);
                     }
              }
              
              if(y !== undefined && y.constructor != Number) {
                     var me = /^\-\=/.test(y), pe = /^\+\=/.test(y);
                     if(me || pe) {
                            y = this.value(null, "y") + parseInt(y.replace(me ? '=' : '+=', ''), 10);
                     } else {
                            y = isNaN(parseInt(y, 10)) ? undefined : parseInt(y, 10);
                     }
              }

              if(o.axis != "vertical" && x !== undefined) {
                     if(o.stepping.x) x = Math.round(x / o.stepping.x) * o.stepping.x;
                     x = this.translateValue(x, "x");
                     x = this.translateLimits(x, "x");
                     x = this.translateRange(x, "x");
                     this.currentHandle.css({ left: x });
              }

              if(o.axis != "horizontal" && y !== undefined) {
                     if(o.stepping.y) y = Math.round(y / o.stepping.y) * o.stepping.y;
                     y = this.translateValue(y, "y");
                     y = this.translateLimits(y, "y");
                     y = this.translateRange(y, "y");
                     this.currentHandle.css({ top: y });
              }
              
              if (this.rangeElement)
                     this.updateRange();
                     
              //Store the slider's value
              this.currentHandle.data("mouse").sliderValue = {
                     x: Math.round(this.convertValue(x, "x")) || 0,
                     y: Math.round(this.convertValue(y, "y")) || 0
              };
       
              if (!noPropagation) {
                     this.propagate('start', null);
                     this.propagate('stop', null);
                     this.propagate('change', null);
                     this.propagate("slide", null);
              }
       }
});

$.ui.slider.getter = "value";

$.ui.slider.defaults = {
       handle: ".ui-slider-handle",
       distance: 1
};

})(jQuery);