/**
 * @author Bruno Bornsztein <bruno@missingmethod.com>
 * @copyright 2007 Curbly LLC
 * @package Glider
 * @license MIT
 * @url http://www.missingmethod.com/projects/glider/
 * @version 0.0.3
 * @dependencies prototype.js 1.5.1+, effects.js
 */
/*  Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/  */
Event.observe(window, 'load', function()
{
    $$(".non-js-words").each(function(words)
    {
        words.style.display = "none";
    });
    var my_glider = new Glider('my-glider', 
    {
        autoGlide: true,
        frequency: 5,
        duration: 0.5,
        initialSection: 'section1'
    });
}); 
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.sections = this.wrapper.getElementsBySelector('div.section');
        this.options = Object.extend(
        {
            duration: 1.0,
            frequency: 5
        }, options ||
        {});
        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();
    },
    addObservers: function()
    {
        var controls = this.wrapper.getElementsBySelector('div.controls a');
        controls.invoke('observe', 'click', this.events.click);
    },
    click: function(event)
    {
        this.stop();
        var element = Event.findElement(event, 'a');
        if (this.scrolling) //if we were scrolling

        {
            this.scrolling.cancel(); //stop
        }
        //go to the designated anchor
        this.moveTo(element.href.split("#")[1], this.scroller, 
        {
            duration: this.options.duration
        });
        Event.stop(event);
    },
    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])
        });
        if ($(element + 'Title') != null) 
        {
            if ($('slideshowHeaderText')) 
            {
                $('slideshowHeaderText').innerHTML = $(element + 'Title').innerHTML;
            }
        }
        if ($(element + 'Text') != null) 
        {
            if ($('slideshowDescriptorText')) 
            {
                $('slideshowDescriptorText').innerHTML = $(element + 'Text').innerHTML;
            }
        }
        if ($(element + 'Tab')) 
        {
            for (i = 1; i < this.sections.length + 1; i++) 
            {
                if ($('section' + i + 'Tab')) 
                {
                    $('section' + i + 'Tab').addClassName('slideshowControl');
                    $('section' + i + 'Tab').removeClassName('slideshowControlCurrent');
                }
            }
            $(element + 'Tab').addClassName('slideshowControlCurrent');
        }
        
        return false;
    },
    next: function()
    {
        if (this.current) 
        {
            var currentIndex = this.current._index;
            var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;
        }
        else 
        {
            var nextIndex = 1;
        }
        var realIndex = nextIndex + 1;
        if ($('section' + realIndex + 'Title')) 
        {
            if ($('slideshowHeaderText')) 
            {
                $('slideshowHeaderText').innerHTML = $('section' + realIndex + 'Title').innerHTML;
            }
        }
        if ($('section' + realIndex + 'Text')) 
        {
            if ($('slideshowDescriptorText')) 
            {
                $('slideshowDescriptorText').innerHTML = $('section' + realIndex + 'Text').innerHTML;
            }
        }
		
        if ($('section' + nextIndex + 'Tab')) 
        {
			$('section' + nextIndex + 'Tab').addClassName('slideshowControl');
            $('section' + nextIndex + 'Tab').removeClassName('slideshowControlCurrent');
			
        }
		
        if ($('section' + realIndex + 'Tab')) 
        {
            $('section' + realIndex + 'Tab').addClassName('slideshowControlCurrent');
        }
        if (nextIndex == 0) 
        {
            if ($('section' + this.sections.length + 'Tab')) 
            {
                $('section' + this.sections.length + 'Tab').removeClassName('slideshowControlCurrent');
            }
        }
        this.moveTo(this.sections[nextIndex], this.scroller, 
        {
            duration: this.options.duration
        });
    },
    previous: function()
    {
        if (this.current) 
        {
            var currentIndex = this.current._index;
            var prevIndex = (currentIndex == 0) ? this.sections.length - 1 : currentIndex - 1;
        }
        else 
        {
            var prevIndex = this.sections.length - 1;
        }
        this.moveTo(this.sections[prevIndex], this.scroller, 
        {
            duration: this.options.duration
        });
    },
    stop: function()
    {
        clearTimeout(this.timer);
    },
    start: function()
    {
        this.periodicallyUpdate();
    },
    periodicallyUpdate: function()
    {
        if (this.timer != null) 
        {
            clearTimeout(this.timer);
            this.next();
        }
        this.timer = setTimeout(this.periodicallyUpdate.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;
    }
});