/**
 * @author Bruno Bornsztein <bruno@missingmethod.com>
 * @author Lee Horrocks <lee@58ninety.com>
 * @copyright 2007 Curbly LLC
 * @package Glider
 * @license MIT
 * @url http://missingmethod.com/projects/glider.html
 * @version 0.0.7
 * @dependencies prototype.js 1.5.1+, effects.js
 */
/*  Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/  */
/* 0.0.7 Changed Timer to Reset when user manually moves next/previous */
/* 0.0.6 Added Support for multiple sections on screen at the same time, and renaming the section div class*/

/* Ajax capabilities added by Bogdan Hapca */
Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
    initialize: function(wrapper, options) {
        this.scrolling = false;
        this.wrapper = $(wrapper);
        this.scroller = this.wrapper.down('div.scroller');
        this.options = Object.extend({
            sectionClass: 'div.section',
            controlsEvent: 'click',
            duration: 0.5,
            frequency: 3,
            rollover: true,
            displayedElements: 1,            
            ajaxBatchSize: 7,
            ajaxTriggerGuardSize: 7,
            ajaxStartBatch: 0
        }, options || {});
        this.sections = this.wrapper.getElementsBySelector(this.options.sectionClass);
        this.sections.each(function(section, index) {
            section._index = index;
        });
        this.events = {
            click: this.click.bind(this)
        };
        this.addObservers();
        if (this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, {
            duration: this.options.duration
        });
        // initialSection should be the id of the section you want to show up on load
        if (this.options.autoGlide) this.start();
        
        this.currentAjaxBatch = options.ajaxStartBatch;
        if (this.sections.length > 0) {
            this.current = this.sections[0];
        }
    },
addObservers: function() {
        this.controls = this.wrapper.getElementsBySelector('.controls a');
        this.controls.invoke('observe', this.options.controlsEvent, this.events.click);
    },
click: function(event) {
        this.stop();
        var element = Event.findElement(event, 'a');
        if (this.scrolling) this.scrolling.cancel();
        this.moveTo(element.href.split("#")[1], this.scroller, {
            duration: this.options.duration
        });
        Event.stop(event);
        this.controls.each(function(control) {
            if (control == element) {
                control.addClassName("active")
            } else {
                control.removeClassName("active")
            }
        });
    },
moveTo: function(element, container, options) {
        this.current = $(element);
        Position.prepare();
        var containerOffset = Position.cumulativeOffset(container),
        elementOffset = Position.cumulativeOffset($(element));
        this.scrolling = new Effect.SmoothScroll(container, 
        {
            duration: options.duration,
            x: (elementOffset[0] - containerOffset[0]),
            y: (elementOffset[1] - containerOffset[1])
        });
        return false;
    },
next: function() {
          if (this.options.autoGlide) { 
            clearTimeout(this.timer);
        } 
         
        if (this.current) {
            //var currentIndex = this.current._index;
            //var nextIndex = (this.sections.length - this.options.displayedElements == currentIndex) ? 0: currentIndex + 1;
            
            var nextIndex = this.current._index;
            if (nextIndex + this.options.displayedElements < this.sections.length) {
                nextIndex++;
            } else if (this.options.rollover) {
                nextIndex = 0;
            }
        } else var nextIndex = 0;
        this.moveTo(this.sections[nextIndex], this.scroller, {
            duration: this.options.duration
        });
          if (this.options.autoGlide) { 
             this.timer = setTimeout(this.next.bind(this), this.options.frequency * 1000);
        }
        
        if (this.options.ajaxHandlerUrl &&
            Math.abs(this.sections.length - nextIndex) < this.options.ajaxTriggerGuardSize &&
            !this.ajaxFetchInProgress && !this.ajaxReachedLast) {
            if (typeof console != 'undefined')  console.log("fetch next batch");
            this.fetchNextAjaxBatch();
        }
        
        if (typeof(this.options.onnext) == 'function') {
                this.options.onnext.call(this);                
        }
    },
fetchNextAjaxBatch: function() {
        this.ajaxFetchInProgress = true;
        var self = this;
        
        var carouselCaption = document.getElementById("carouselCaption");
	    carouselCaption.innerHTML = 'Loading current promotions ...';
	    carouselCaption.style.backgroundImage = 'url(images/cart_wait.gif)';
            carouselCaption.style.backgroundRepeat = 'no-repeat';
            carouselCaption.style.backgroundPosition = '13.5em 50%';
        
        new Ajax.Request(this.options.ajaxHandlerUrl,
        {
          method:'get',
          parameters: {batch: this.currentAjaxBatch++, items_in_batch: this.options.ajaxBatchSize},
          onSuccess: function(transport){
            self.ajaxFetchInProgress = false;
            var items = eval(transport.responseText);
            if (typeof console != 'undefined') console.log("Got " + items.length + " items");
            for (var i = 0; i < items.length; i++) {
                var e = new Element('div', { 'class': 'panelHome carouselItems'});
                var eHtml = '';
                eHtml += '\t<a href="products/' + items[i]['productpagelink'] + '">\r\n';
                eHtml += '\t\t<img style="height:12.25em;pading-left:1em;width:11.5em" class="homePagePanelImage" alt="" src="products/images/' + items[i]['productimage'] + '"/>\r\n';
                eHtml += '\t\t<span style="display:block;margin-left:auto;margin-right:auto;text-align:center;width:11em;" class="homePagePanelPrice"> $' + items[i]['price'] + ' CAD </span>';
                eHtml += '\t\t<span style="display:block;color:red;text-decoration:line-through;margin-left:auto;margin-right:auto;text-align:center;width:11em;" class="homePagePanelRegPrice"> $' + items[i]['reg_price'] + ' CAD </span>';
                eHtml += '\t</a>';
                e.setStyle({cssFloat:'left', overflow:'hidden', height:'15.33em', paddingLeft:'4px', paddingRight:'4px', verticalAlign:'top', borderColor:'#d9d9d9', borderStyle:'solid', borderWidth:'0 0 0 1px', width:'13.33em', display:'block', color:'#333', fontFamily:'arial,helvetica,sans-serif', fontSize:'12px'})
                e.innerHTML = eHtml;
                
                var lastSection = self.sections[self.sections.length - 1];
                e._index = lastSection._index + 1;
                lastSection.insert({after:e});
                self.sections.push(e);
            }
            
            if (items.length > 0) {
            	var nextLink = document.getElementById('featurednext_img');
            	nextLink.src = 'images/carousel_right_arrow.jpg'; 
            	
                self.ajaxReachedLast = false;
            } else {
                self.ajaxReachedLast = true;
            }
            
            carouselCaption.innerHTML = 'current promotions:';
	    carouselCaption.style.background = 'none';
          },
          onFailure: function(){self.ajaxFetchInProgress = false; if (typeof console != 'undefined')  console.log('Something went wrong...') }
        });
    },
previous: function() {
          if (this.options.autoGlide) { 
            clearTimeout(this.timer);
        }
        
        if (this.current) {
            //var currentIndex = this.current._index;
            //var prevIndex = (currentIndex == 0) ? this.sections.length - this.options.displayedElements: currentIndex - 1;
            
            var prevIndex = this.current._index;
            if (prevIndex > 0) {
                prevIndex--;
            } else if (this.options.rollover) {
                prevIndex = this.sections.length - this.options.displayedElements;
            } 
        } else var prevIndex = 0;
        this.moveTo(this.sections[prevIndex], this.scroller, {
            duration: this.options.duration
        });
          if (this.options.autoGlide) { 
             this.timer = setTimeout(this.next.bind(this), this.options.frequency * 1000);
        }
        
        //if (this.options.ajaxHandlerUrl &&
        //    prevIndex < this.options.ajaxTriggerGuardSize &&
        //    !this.ajaxFetchInProgress && !this.ajaxReachedFirst) {
        //    if (typeof console != 'undefined') console.log("fetch prev batch");
        //    this.fetchPreviousAjaxBatch();
        //}
        
        if (typeof(this.options.onprevious) == 'function') {
                this.options.onprevious.call(this);                
        }
    },
fetchPreviousAjaxBatch: function() {
        this.ajaxFetchInProgress = true;
        var self = this;
        new Ajax.Request(this.options.ajaxHandlerUrl,
        {
          method:'get',
          parameters: {batch: this.currentAjaxBatch--, items_in_batch: this.options.ajaxBatchSize},
          onSuccess: function(transport){
            self.ajaxFetchInProgress = false;
            var items = eval(transport.responseText);
            
            if (items.length > 0) {
                this.ajaxReachedFirst = false;
            } else {
                this.ajaxReachedFirst = true;
            }
          },
          onFailure: function(){self.ajaxFetchInProgress = false; if (typeof console != 'undefined') console.log('Something went wrong...') }
        });
    },    
stop: function()
    {
        clearTimeout(this.timer);
    },
start: function()
    {
        this.periodicallyUpdate();
    },
periodicallyUpdate: function()
    {
        if (this.timer != null) {
            clearTimeout(this.timer);
        }
        this.timer = setTimeout(this.next.bind(this), this.options.frequency * 1000);
    }
});
Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
    initialize: function(element) {
        this.element = $(element);
        var options = Object.extend({
            x: 0,
            y: 0,
            mode: 'absolute'
        },
        arguments[1] || {});
        this.start(options);
    },
    setup: function() {
        if (this.options.continuous && !this.element._ext) {
            this.element.cleanWhitespace();
            this.element._ext = true;
            this.element.appendChild(this.element.firstChild);
        }
        this.originalLeft = this.element.scrollLeft;
        this.originalTop = this.element.scrollTop;
        if (this.options.mode == 'absolute') {
            this.options.x -= this.originalLeft;
            this.options.y -= this.originalTop;
        }
    },
    update: function(position) {
        this.element.scrollLeft = this.options.x * position + this.originalLeft;
        this.element.scrollTop = this.options.y * position + this.originalTop;
    }
});