/**
 * @author Ryan Johnson <http://syntacticx.com/>
 * @copyright 2008 PersonalGrid Corporation <http://personalgrid.com/>
 * @package LivePipe UI
 * @license MIT
 * @url http://livepipe.net/core
 * @require prototype.js
 */

if(typeof(Control) == 'undefined')
    Control = {};
    
var $proc = function(proc){
    return typeof(proc) == 'function' ? proc : function(){return proc};
};

var $value = function(value){
    return typeof(value) == 'function' ? value() : value;
};

Object.Event = {
    extend: function(object){
        object._objectEventSetup = function(event_name){
            this._observers = this._observers || {};
            this._observers[event_name] = this._observers[event_name] || [];
        };
        object.observe = function(event_name,observer){
            if(typeof(event_name) == 'string' && typeof(observer) != 'undefined'){
                this._objectEventSetup(event_name);
                if(!this._observers[event_name].include(observer))
                    this._observers[event_name].push(observer);
            }else
                for(var e in event_name)
                    this.observe(e,event_name[e]);
        };
        object.stopObserving = function(event_name,observer){
            this._objectEventSetup(event_name);
            if(event_name && observer)
                this._observers[event_name] = this._observers[event_name].without(observer);
            else if(event_name)
                this._observers[event_name] = [];
            else
                this._observers = {};
        };
        object.observeOnce = function(event_name,outer_observer){
            var inner_observer = function(){
                outer_observer.apply(this,arguments);
                this.stopObserving(event_name,inner_observer);
            }.bind(this);
            this._objectEventSetup(event_name);
            this._observers[event_name].push(inner_observer);
        };
        object.notify = function(event_name){
            this._objectEventSetup(event_name);
            var collected_return_values = [];
            var args = $A(arguments).slice(1);
            try{
                for(var i = 0; i < this._observers[event_name].length; ++i)
                    collected_return_values.push(this._observers[event_name][i].apply(this._observers[event_name][i],args) || null);
            }catch(e){
                if(e == $break)
                    return false;
                else
                    throw e;
            }
            return collected_return_values;
        };
        if(object.prototype){
            object.prototype._objectEventSetup = object._objectEventSetup;
            object.prototype.observe = object.observe;
            object.prototype.stopObserving = object.stopObserving;
            object.prototype.observeOnce = object.observeOnce;
            object.prototype.notify = function(event_name){
                if(object.notify){
                    var args = $A(arguments).slice(1);
                    args.unshift(this);
                    args.unshift(event_name);
                    object.notify.apply(object,args);
                }
                this._objectEventSetup(event_name);
                var args = $A(arguments).slice(1);
                var collected_return_values = [];
                try{
                    if(this.options && this.options[event_name] && typeof(this.options[event_name]) == 'function')
                        collected_return_values.push(this.options[event_name].apply(this,args) || null);
                    for(var i = 0; i < this._observers[event_name].length; ++i)
                        collected_return_values.push(this._observers[event_name][i].apply(this._observers[event_name][i],args) || null);
                }catch(e){
                    if(e == $break)
                        return false;
                    else
                        throw e;
                }
                return collected_return_values;
            };
        }
    }
};

/* Begin Core Extensions */

//Element.observeOnce
Element.addMethods({
    observeOnce: function(element,event_name,outer_callback){
        var inner_callback = function(){
            outer_callback.apply(this,arguments);
            Element.stopObserving(element,event_name,inner_callback);
        };
        Element.observe(element,event_name,inner_callback);
    }
});

//mouse:wheel
(function(){
    function wheel(event){
        var delta, element, custom_event;
        // normalize the delta
        if (event.wheelDelta) { // IE & Opera
            delta = event.wheelDelta / 120;
        } else if (event.detail) { // W3C
            delta =- event.detail / 3;
        }
        if (!delta) { return; }
        element = Event.extend(event).target;
        element = Element.extend(element.nodeType === Node.TEXT_NODE ? element.parentNode : element);
        custom_event = element.fire('mouse:wheel',{ delta: delta });
        if (custom_event.stopped) {
            Event.stop(event);
            return false;
        }
    }
    document.observe('mousewheel',wheel);
    document.observe('DOMMouseScroll',wheel);
})();
// script.aculo.us slider.js v1.8.3, Thu Oct 08 11:23:33 +0200 2009

// Copyright (c) 2005-2009 Marty Haught, Thomas Fuchs
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

if (!Control) var Control = { };

// options:
// axis: 'vertical', or 'horizontal' (default)
//
// callbacks:
// onChange(value)
// onSlide(value)
Control.Slider = Class.create({
  initialize: function(handle, track, options) {
    var slider = this;
    
    if (Object.isArray(handle)) {
      this.handles = handle.collect( function(e) { return $(e) });
    } else {
      this.handles = [$(handle)];
    }

    this.track = $(track);
    this.options = options || { };

    this.axis = this.options.axis || 'horizontal';
    this.increment = this.options.increment || 1;
    this.step = parseInt(this.options.step || '1');
    this.range = this.options.range || $R(0,1);

    this.value = 0; // assure backwards compat
    this.values = this.handles.map( function() { return 0 });
    this.spans = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false;
    this.options.startSpan = $(this.options.startSpan || null);
    this.options.endSpan = $(this.options.endSpan || null);

    this.restricted = this.options.restricted || false;

    this.maximum = this.options.maximum || this.range.end;
    this.minimum = this.options.minimum || this.range.start;

    // Will be used to align the handle onto the track, if necessary
    this.alignX = parseInt(this.options.alignX || '0');
    this.alignY = parseInt(this.options.alignY || '0');

    this.trackLength = this.maximumOffset() - this.minimumOffset();

    this.handleLength = this.isVertical() ?
      (this.handles[0].offsetHeight != 0 ?
        this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/,"")) :
      (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth :
        this.handles[0].style.width.replace(/px$/,""));

    this.active = false;
    this.dragging = false;
    this.disabled = false;

    if (this.options.disabled) this.setDisabled();

    // Allowed values array
    this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
    if (this.allowedValues) {
      this.minimum = this.allowedValues.min();
      this.maximum = this.allowedValues.max();
    }

    this.eventMouseDown = this.startDrag.bindAsEventListener(this);
    this.eventMouseUp = this.endDrag.bindAsEventListener(this);
    this.eventMouseMove = this.update.bindAsEventListener(this);

    // Initialize handles in reverse (make sure first handle is active)
    this.handles.each( function(h,i) {
      i = slider.handles.length-1-i;
      slider.setValue(parseFloat(
        (Object.isArray(slider.options.sliderValue) ?
          slider.options.sliderValue[i] : slider.options.sliderValue) ||
         slider.range.start), i);
      h.makePositioned().observe("mousedown", slider.eventMouseDown);
    });

    this.track.observe("mousedown", this.eventMouseDown);
    document.observe("mouseup", this.eventMouseUp);

    this.initialized = true;
  },
  dispose: function() {
    var slider = this;
    Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
    Event.stopObserving(document, "mouseup", this.eventMouseUp);
    Event.stopObserving(document, "mousemove", this.eventMouseMove);
    this.handles.each( function(h) {
      Event.stopObserving(h, "mousedown", slider.eventMouseDown);
    });
  },
  setDisabled: function(){
    this.disabled = true;
  },
  setEnabled: function(){
    this.disabled = false;
  },
  getNearestValue: function(value){
    if (this.allowedValues){
      if (value >= this.allowedValues.max()) return(this.allowedValues.max());
      if (value <= this.allowedValues.min()) return(this.allowedValues.min());

      var offset = Math.abs(this.allowedValues[0] - value);
      var newValue = this.allowedValues[0];
      this.allowedValues.each( function(v) {
        var currentOffset = Math.abs(v - value);
        if (currentOffset <= offset){
          newValue = v;
          offset = currentOffset;
        }
      });
      return newValue;
    }
    if (value > this.range.end) return this.range.end;
    if (value < this.range.start) return this.range.start;
    return value;
  },
  setValue: function(sliderValue, handleIdx){
    if (!this.active) {
      this.activeHandleIdx = handleIdx || 0;
      this.activeHandle = this.handles[this.activeHandleIdx];
      this.updateStyles();
    }
    handleIdx = handleIdx || this.activeHandleIdx || 0;
    if (this.initialized && this.restricted) {
      if ((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
        sliderValue = this.values[handleIdx-1];
      if ((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))
        sliderValue = this.values[handleIdx+1];
    }
    sliderValue = this.getNearestValue(sliderValue);
    this.values[handleIdx] = sliderValue;
    this.value = this.values[0]; // assure backwards compat

    this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] =
      this.translateToPx(sliderValue);

    this.drawSpans();
    if (!this.dragging || !this.event) this.updateFinished();
  },
  setValueBy: function(delta, handleIdx) {
    this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta,
      handleIdx || this.activeHandleIdx || 0);
  },
  translateToPx: function(value) {
    return Math.round(
      ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) *
      (value - this.range.start)) + "px";
  },
  translateToValue: function(offset) {
    return ((offset/(this.trackLength-this.handleLength) *
      (this.range.end-this.range.start)) + this.range.start);
  },
  getRange: function(range) {
    var v = this.values.sortBy(Prototype.K);
    range = range || 0;
    return $R(v[range],v[range+1]);
  },
  minimumOffset: function(){
    return(this.isVertical() ? this.alignY : this.alignX);
  },
  maximumOffset: function(){
    return(this.isVertical() ?
      (this.track.offsetHeight != 0 ? this.track.offsetHeight :
        this.track.style.height.replace(/px$/,"")) - this.alignY :
      (this.track.offsetWidth != 0 ? this.track.offsetWidth :
        this.track.style.width.replace(/px$/,"")) - this.alignX);
  },
  isVertical: function(){
    return (this.axis == 'vertical');
  },
  drawSpans: function() {
    var slider = this;
    if (this.spans)
      $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });
    if (this.options.startSpan)
      this.setSpan(this.options.startSpan,
        $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));
    if (this.options.endSpan)
      this.setSpan(this.options.endSpan,
        $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));
  },
  setSpan: function(span, range) {
    if (this.isVertical()) {
      span.style.top = this.translateToPx(range.start);
      span.style.height = this.translateToPx(range.end - range.start + this.range.start);
    } else {
      span.style.left = this.translateToPx(range.start);
      span.style.width = this.translateToPx(range.end - range.start + this.range.start);
    }
  },
  updateStyles: function() {
    this.handles.each( function(h){ Element.removeClassName(h, 'selected') });
    Element.addClassName(this.activeHandle, 'selected');
  },
  startDrag: function(event) {
    if (Event.isLeftClick(event)) {
      if (!this.disabled){
        this.active = true;
        document.observe("mousemove", this.eventMouseMove);
        
        var handle = Event.element(event);
        var pointer = [Event.pointerX(event), Event.pointerY(event)];
        var track = handle;
        if (track==this.track) {
          var offsets = this.track.cumulativeOffset();
          this.event = event;
          this.setValue(this.translateToValue(
           (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)
          ));
          var offsets = this.activeHandle.cumulativeOffset();
          this.offsetX = (pointer[0] - offsets[0]);
          this.offsetY = (pointer[1] - offsets[1]);
        } else {
          // find the handle (prevents issues with Safari)
          while((this.handles.indexOf(handle) == -1) && handle.parentNode)
            handle = handle.parentNode;

          if (this.handles.indexOf(handle)!=-1) {
            this.activeHandle = handle;
            this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
            this.updateStyles();

            var offsets = this.activeHandle.cumulativeOffset();
            this.offsetX = (pointer[0] - offsets[0]);
            this.offsetY = (pointer[1] - offsets[1]);
          }
        }
      }
      Event.stop(event);
    }
  },
  update: function(event) {
   if (this.active) {
      if (!this.dragging) this.dragging = true;
      this.draw(event);
      if (Prototype.Browser.WebKit) window.scrollBy(0,0);
      Event.stop(event);
   }
  },
  draw: function(event) {
    var pointer = [Event.pointerX(event), Event.pointerY(event)];
    var offsets = this.track.cumulativeOffset();
    pointer[0] -= this.offsetX + offsets[0];
    pointer[1] -= this.offsetY + offsets[1];
    this.event = event;
    this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
    if (this.initialized && this.options.onSlide)
      this.options.onSlide(this.values.length>1 ? this.values : this.value, this);
  },
  endDrag: function(event) {
    if (this.active && this.dragging) {
      this.finishDrag(event, true);
      Event.stop(event);
    }
    Event.stopObserving(document, "mousemove", this.eventMouseMove);
    this.active = false;
    this.dragging = false;
  },
  finishDrag: function(event, success) {
    this.active = false;
    this.dragging = false;
    this.updateFinished();
  },
  updateFinished: function() {
    if (this.initialized && this.options.onChange)
      this.options.onChange(this.values.length>1 ? this.values : this.value, this);
    this.event = null;
  }
});
/**
* @author Ryan Johnson <http://syntacticx.com/>
* @copyright 2008 PersonalGrid Corporation <http://personalgrid.com/>
* @package LivePipe UI
* @license MIT
* @url http://livepipe.net/control/scrollbar
* @require prototype.js, slider.js, livepipe.js
*/

if(typeof(Prototype) == "undefined")
    throw "Control.ScrollBar requires Prototype to be loaded.";
if(typeof(Control.Slider) == "undefined")
    throw "Control.ScrollBar requires Control.Slider to be loaded.";
if(typeof(Object.Event) == "undefined")
    throw "Control.ScrollBar requires Object.Event to be loaded.";

Control.ScrollBar = Class.create({
    initialize: function(container,track,options){
        this.enabled = false;
        this.notificationTimeout = false;
        this.container = $(container);
        this.boundMouseWheelEvent = this.onMouseWheel.bindAsEventListener(this);
        this.boundResizeObserver = this.onWindowResize.bind(this);
        this.track = $(track);
        this.handle = this.track.getElementsByClassName('scrollbar_handle')[0];
        this.options = Object.extend({
            active_class_name: 'scrolling',
            apply_active_class_name_to: this.container,
            notification_timeout_length: 125,
            handle_minimum_height: 25,
            scroll_to_smoothing: 0.01,
            scroll_to_steps: 30,
            proportional: true,
            alwaysEnabled: false,
            slider_options: {}
        },options || {});
        this.slider = new Control.Slider(this.handle,this.track,Object.extend({
            axis: 'vertical',
            onSlide: this.onChange.bind(this),
            onChange: this.onChange.bind(this)
        },this.options.slider_options));
        this.recalculateLayout();
        Event.observe(window,'resize',this.boundResizeObserver);
        this.handle.observe('mousedown',function(){
            if(this.auto_sliding_executer)
                this.auto_sliding_executer.stop();
        }.bind(this));
    },
    destroy: function(){
        Event.stopObserving(window,'resize',this.boundResizeObserver);
    },
    enable: function(){
        this.enabled = true;
        this.container.observe('mouse:wheel',this.boundMouseWheelEvent);
        this.slider.setEnabled();
        this.track.show();
        if(this.options.active_class_name)
            $(this.options.apply_active_class_name_to).addClassName(this.options.active_class_name);
        this.notify('enabled');
    },
    disable: function(){
    	if(!this.options.alwaysEnabled) {
	        this.enabled = false;
	        this.container.stopObserving('mouse:wheel',this.boundMouseWheelEvent);
	        this.slider.setDisabled();
	        this.track.hide();
	        if(this.options.active_class_name)
	            $(this.options.apply_active_class_name_to).removeClassName(this.options.active_class_name);
	        this.notify('disabled');
	        this.reset();
    	}
    },
    reset: function(){
        this.slider.setValue(0);
    },
    recalculateLayout: function(){
        if(this.container.scrollHeight <= this.container.offsetHeight && !this.options.alwaysEnabled) {
        	this.disable();
        }else{        	
            this.enable(); 
            this.slider.trackLength = this.slider.maximumOffset() - this.slider.minimumOffset();
            if(this.options.proportional){
                this.handle.style.height = Math.floor(Math.max(this.container.offsetHeight * (this.container.offsetHeight / Math.max(this.container.scrollHeight, this.container.offsetHeight)),this.options.handle_minimum_height)) + 'px';
                this.slider.handleLength = this.handle.style.height.replace(/px/,'');
            }
        }
    },
    onWindowResize: function(){
        this.recalculateLayout();
        this.scrollBy(0);
    },
    onMouseWheel: function(event){
        if(this.auto_sliding_executer)
            this.auto_sliding_executer.stop();
        this.slider.setValueBy(-(event.memo.delta / 20)); //put in math to account for the window height
        event.stop();
        return false;
    },
    onChange: function(value){
        this.container.scrollTop = Math.round(value / this.slider.maximum * (this.container.scrollHeight - this.container.offsetHeight));
        if(this.notification_timeout)
            window.clearTimeout(this.notificationTimeout);
        this.notificationTimeout = window.setTimeout(function(){
            this.notify('change',value);
        }.bind(this),this.options.notification_timeout_length);
    },
    getCurrentMaximumDelta: function(){
        return this.slider.maximum * (this.container.scrollHeight - this.container.offsetHeight);
    },
    getDeltaToElement: function(element){
        return this.slider.maximum * ((element.positionedOffset().top + (element.getHeight() / 2)) - (this.container.getHeight() / 2));
    },
    scrollTo: function(y,animate){
        var current_maximum_delta = this.getCurrentMaximumDelta();
        if(y == 'top')
            y = 0;
        else if(y == 'bottom')
            y = current_maximum_delta;
        else if(typeof(y) != "number")
            y = this.getDeltaToElement($(y));
        if(this.enabled){
            y = Math.max(0,Math.min(y,current_maximum_delta));
            if(this.auto_sliding_executer)
                this.auto_sliding_executer.stop();
            var target_value = y / current_maximum_delta;
            var original_slider_value = this.slider.value;
            var delta = (target_value - original_slider_value) * current_maximum_delta;
            if(animate){
                this.auto_sliding_executer = new PeriodicalExecuter(function(){
                    if(Math.round(this.slider.value * 100) / 100 < Math.round(target_value * 100) / 100 || Math.round(this.slider.value * 100) / 100 > Math.round(target_value * 100) / 100){
                        this.scrollBy(delta / this.options.scroll_to_steps);
                    }else{
                        this.auto_sliding_executer.stop();
                        this.auto_sliding_executer = null;
                        if(typeof(animate) == "function")
                            animate();
                    }
                }.bind(this),this.options.scroll_to_smoothing);
            }else
                this.scrollBy(delta);
        }else if(typeof(animate) == "function")
            animate();
    },
    scrollBy: function(y){
        if(!this.enabled)
            return false;
        this.slider.setValueBy(y / this.getCurrentMaximumDelta());
    }
});
Object.Event.extend(Control.ScrollBar);