/*
Copyright (c) 2009 Victor Stanciu - http://www.victorstanciu.ro

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/

Carousel = Class.create(Abstract, {
    initialize: function (scroller, slides, controls, options) {
        this.scrolling	= false;
        this.scroller	= $(scroller);
        this.slides		= slides;
        this.controls	= controls;

        this.options    = Object.extend({
            duration:           1,
            auto:               false,
            frequency:          3,
            visibleSlides:      1,
            leftArrowId:        'carousel-arrow-left',
            rightArrowId:       'carousel-arrow-right',
            carouselJumper:     'carousel-jumper-',
            controlClassName:   'carousel-control',
            jumperClassName:    'carousel-jumper',
            disabledClassName:  'carousel-disabled',
            inactiveClassName:  'carousel-inactive',
            selectedClassName:  'carousel-selected',
            circular:           false,
            wheel:              true,
            effect:             'scroll',
            transition:         'sinoidal',
            step:               1,
            wrap:               'carousel-wrap',
            imgToPreload:       1,
            imgURLs:            {}
        }, options || {});

        if (this.options.effect == 'fade') {
            this.options.circular = true;
        }

        this.slides.each(function(slide, index) {
            slide._index = index;
        });

        if (this.controls) {
            this.controls.invoke('observe', 'click', this.click.bind(this));
        }

        if (this.options.wheel) {
            this.scroller.observe('mousewheel', this.wheel.bindAsEventListener(this)).observe('DOMMouseScroll', this.wheel.bindAsEventListener(this));;
        }

        if (this.options.auto) {
            this.start();
        }
        if (this.options.initial) {
            var initialIndex = this.slides.indexOf($(this.options.initial));
            if (initialIndex > (this.options.visibleSlides - 1) && this.options.visibleSlides > 1) {
                if (initialIndex > this.slides.length - (this.options.visibleSlides + 1)) {
                    initialIndex = this.slides.length - this.options.visibleSlides;
                }
            }
            this.moveTo(this.slides[initialIndex]);
        }
        this.checkPrev();
        this.checkNext();
    },
    click: function (event) {
        this.stop();

        var element = event.findElement('a');
        if (element.hasClassName(this.options.inactiveClassName)) {
            return;
        }
        if (!element.hasClassName(this.options.disabledClassName)) {
            if (element.hasClassName(this.options.controlClassName)) {
                eval("this." + element.rel + "()");
            } else if (element.hasClassName(this.options.jumperClassName)) {
                this.moveTo(element.rel);
                if (this.options.selectedClassName) {
                    this.controls.invoke('removeClassName', this.options.selectedClassName);
                    element.addClassName(this.options.selectedClassName);
                }
            }
        }

        this.deactivateControls();

        event.stop();
    },

    moveTo: function (element) {
        if (this.options.beforeMove && (typeof this.options.beforeMove == 'function')) {
            this.options.beforeMove();
        }

        this.previous = this.current ? this.current : this.slides[0];
        this.current  = $(element);

        var scrollerOffset = 0;
        var elementOffset  = 0;
        if (typeof(this.current) == 'object') {
            scrollerOffset = this.scroller.cumulativeOffset();
            elementOffset  = this.current.cumulativeOffset();
        }
        if (this.scrolling) {
            this.scrolling.cancel();
        }
        switch (this.options.effect) {
            case 'fade':
                this.scrolling = new Effect.Opacity(this.scroller, {
                    from:   1.0,
                    to:     0,
                    duration: this.options.duration,
                    afterFinish: (function () {
                        this.scroller.scrollLeft = elementOffset[0] - scrollerOffset[0];
                        this.scroller.scrollTop  = elementOffset[1] - scrollerOffset[1];

                        new Effect.Opacity(this.scroller, {
                            from: 0,
                            to: 1.0,
                            duration: this.options.duration,
                            afterFinish: (function () {
                                if (this.controls) {
                                    this.activateControls();
                                }
                                if (this.options.afterMove && (typeof this.options.afterMove == 'function')) {
                                    this.options.afterMove();
                                }
                            }).bind(this)
                        });
                    }
                    ).bind(this)
                    });
                break;
            case 'scroll':
            default:
                var transition;
                switch (this.options.transition) {
                    case 'spring':
                        transition = Effect.Transitions.spring;
                        break;
                    case 'sinoidal':
                    default:
                        transition = Effect.Transitions.sinoidal;
                        break;
                }

                this.scrolling = new Effect.SmoothScroll(this.scroller, {
                    duration: this.options.duration,
                    x: (elementOffset[0] - scrollerOffset[0]),
                    y: (elementOffset[1] - scrollerOffset[1]),
                    transition: transition,
                    afterFinish: (function () {
                        if (this.controls) {
                            this.activateControls();
                        }
                        if (this.options.afterMove && (typeof this.options.afterMove == 'function')) {
                            this.options.afterMove();
                        }
                        this.scrolling = false;
                    }).bind(this)
                    });
                break;
        }
        this.checkPrev();
        this.checkNext();

        return false;
    },
    prev: function () {
        var prevIndex = this.getPrevIndex();
        this.checkJumper(prevIndex+1, false);
        this.moveTo(this.slides[prevIndex]);
    },
    next: function () {
        var nextIndex = this.getNextIndex();
        this.checkJumper(nextIndex+1, true);
        this.moveTo(this.slides[nextIndex]);
    },
    getPrevIndex: function() {
        var prevIndex = (this.options.circular ? this.slides.length - 1 : 0);
        if (this.current) {
            var currentIndex = this.current._index;
            prevIndex = (currentIndex == 0) ? (this.options.circular ? this.slides.length - 1 : 0) : currentIndex - this.options.step;
            prevIndex = (prevIndex < 0) ? 0 : prevIndex;
        }

        if (prevIndex == (this.slides.length - 1) && this.options.circular && this.options.effect != 'fade') {
            this.scroller.scrollLeft =  (this.slides.length - 1) * this.slides.first().getWidth();
            this.scroller.scrollTop =  (this.slides.length - 1) * this.slides.first().getHeight();
            prevIndex = this.slides.length - 2;
        }
        return prevIndex;
    },
    getNextIndex: function() {
        var currentIndex = 0;
        var nextIndex = this.options.step;
        if (this.current) {
            currentIndex = this.current._index;
        }
        nextIndex = (this.slides.length - 1 == currentIndex) ? (this.options.circular ? 0 : currentIndex) : currentIndex + this.options.step;
        nextIndex = ((nextIndex + this.options.step) > this.slides.length) ? (this.slides.length - this.options.step) : nextIndex;
        if (nextIndex == 0 && this.options.circular && this.options.effect != 'fade') {
            this.scroller.scrollLeft = 0;
            this.scroller.scrollTop  = 0;
            nextIndex = 1;
        }

        if ((nextIndex +1 ) > this.slides.length) {
            nextIndex = currentIndex;
        }
        return nextIndex;
    },
    checkJumper: function(index, next) {
        if ((index%(this.options.step+1)) && index != 1) {
            var c = index/(this.options.step+1) + (index%(this.options.step+1) ? 1 : 0);
            var index = this.options.step * parseInt(c) + 1;
        }

        if (next) {
            var current = index - this.options.step;
        } else {
            var current = index + this.options.step;
        }
        if ($(this.options.carouselJumper + current)) {
            $(this.options.carouselJumper + current).removeClassName('carousel-selected');
        }
        if ($(this.options.carouselJumper + index)) {
            $(this.options.carouselJumper + index).addClassName('carousel-selected');
        }
    },
    checkPrev: function () {
        var prevIndex = -1;
        if (this.current) {
            var currentIndex = this.current._index;
            prevIndex = (currentIndex > 0) ? 1 : -1;
        }

        if (prevIndex < 0) {
            $(this.options.leftArrowId).addClassName('carousel-inactive');
        } else {
            $(this.options.leftArrowId).removeClassName('carousel-inactive');
        }
    },
    checkNext: function () {
        var nextIndex = this.options.step;
        if (this.current) {
            var currentIndex = this.current._index;
            nextIndex = (this.slides.length - 1 == currentIndex) ? (this.options.circular ? 0 : currentIndex+ this.options.step) : currentIndex + this.options.step;
        }
        if ((nextIndex +1 )  > this.slides.length) {
            $(this.options.rightArrowId).addClassName('carousel-inactive');
        } else {
            $(this.options.rightArrowId).removeClassName('carousel-inactive');
        }
    },

    first: function () {
        this.moveTo(this.slides[0]);
    },

    last: function () {
        this.moveTo(this.slides[this.slides.length - 1]);
    },

    toggle: function () {
        if (this.previous) {
            this.moveTo(this.slides[this.previous._index]);
        } else {
            return false;
        }
    },

    stop: function () {
        if (this.timer) {
            clearTimeout(this.timer);
        }
    },

    start: function () {
        this.periodicallyUpdate();
    },

    pause: function () {
        this.stop();
        this.activateControls();
    },

    resume: function (event) {
        if (event) {
            var related = event.relatedTarget || event.toElement;
            if (!related || (!this.slides.include(related) && !this.slides.any(function (slide) {
                return related.descendantOf(slide);
            }))) {
                this.start();
            }
        } else {
            this.start();
        }
    },

    periodicallyUpdate: function () {
        if (this.timer != null) {
            clearTimeout(this.timer);
            this.next();
        }
        this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency * 1000);
    },
    wheel: function (event) {
        event.cancelBubble = true;
        Event.stop(event);

        var delta = 0;
        if (!event) {
            event = window.event;
        }
        if (event.wheelDelta) {
            delta = event.wheelDelta / 120;
        } else if (event.detail) {
            delta = -event.detail / 3;
        }

        if (!this.scrolling) {
            this.deactivateControls();
            if (delta > 0) {
                this.prev();
            } else {
                this.next();
            }
        }

        return Math.round(delta); //Safari Round
    },

    deactivateControls: function () {
        this.controls.invoke('addClassName', this.options.disabledClassName);
    },

    activateControls: function () {
        this.controls.invoke('removeClassName', this.options.disabledClassName);
    }
});


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;
    }
});