var JASlideshow = new Class({

    initialize: function(options) {
        this.options = Object.extend({
            buttons: {},
            interval: 5000,
            handle_event: 'click',
            button_event: 'click',
            box: {},
            size: 240,
            mode: 'horizontal',
            items: [],
            handles: [],
            onWalk: {},
            animation: 'fade',
            autoPlay: false
        }, options || {});

        this.items = this.options.items;
        this.modes = { horizontal: ['left', 'width'], vertical: ['top', 'height'] };

        this.box = $(this.options.box);

        this.buttons = { previous: [], next: [], play: [], playback: [], stop: [] };

        this.allbuttons = [];
        if (this.options.buttons) {
            for (var action in this.options.buttons) {
                this.addActionButtons(action, $type(this.options.buttons[action]) == 'array' ? this.options.buttons[action] : [this.options.buttons[action]]);
            }
        }
        this.handles = this.options.handles;
        if (this.handles) {
            this.addHandleButtons(this.handles);
        }
        //this.fx = new Fx.Style(this.box,this.modes[this.options.mode][0],this.options.fxOptions||{duration:500,wait:false});
        this.allbuttons.each(function(button) {
            button.addEvent('mouseover', function() { this.addClass('hover'); });
            button.addEvent('mouseout', function() { this.removeClass('hover'); });
        });

        this.currentIndex = this.options.startItem || 0;
        this.previousIndex = null;
        this.nextIndex = null;
        this._auto = null;
        this.initFx();
        if (this.options.autoPlay) this.play(this.options.interval, 'next', true);
        this.walk(this.currentIndex);
    },

    previous: function(manual) {
        this.lastIndex = this.currentIndex;
        this.currentIndex += this.currentIndex > 0 ? -1 : this.items.length - 1;
        this.walk(null, manual);
    },

    next: function(manual) {
        this.lastIndex = this.currentIndex;
        this.currentIndex += this.currentIndex < this.items.length - 1 ? 1 : 1 - this.items.length;
        this.walk(null, manual);
    },

    play: function(delay, direction, wait) {
        this.stop();
        if (!wait) {
            this[direction](false);
        }
        this._auto = this[direction].periodical(delay, this, false);
    },

    stop: function() {
        $clear(this._auto);
    },

    walk: function(item, manual) {
        //alert(item + ' ' + manual);
        if ($defined(item)) {
            this.lastIndex = this.currentIndex;
            //if(item==this.currentIndex) return;
            this.currentIndex = item;
        }
        this.previousIndex = this.currentIndex + (this.currentIndex > 0 ? -1 : this.items.length - 1);
        this.nextIndex = this.currentIndex + (this.currentIndex < this.items.length - 1 ? 1 : 1 - this.items.length);
        if (manual) { this.stop(); }
        //this.fx.start(-this.currentIndex*this.options.size + this.options.offset);
        if (this.options.onWalk) { this.options.onWalk(this.currentIndex, (this.handles ? this.handles[this.currentIndex] : null)); }
        this.animate();
        if (manual && this.options.autoPlay) { this.play(this.options.interval, 'next', true); }
    },
    initFx: function() {
        if (this.options.animation.test(/move/)) {
            this.box.setStyle(this.modes[this.options.mode][1], (this.options.size * this.options.items.length + 200) + 'px');
            this.box.setStyle(this.modes[this.options.mode][0], (-this.currentIndex * this.options.size) + this.options.offset + 'px');
            this.fx = new Fx.Style(this.box, this.modes[this.options.mode][0], this.options.fxOptions || { duration: 500, wait: false });
            return;
        }
        this.items.setStyles({ 'position': 'absolute', 'left': 0, 'top': 0, 'display': 'none' });
        this.items[this.currentIndex].setStyle('display', 'block');
        if (this.options.animation.test(/fade/)) {
            for (var i = 0; i < this.items.length; i++) {
                this.items[i].fx = new Fx.Style(this.items[i], 'opacity', this.options.fxOptions || { duration: 500, wait: false });
            }
        }
    },
    animate: function() {
        if (this.options.animation.test(/move/)) {
            this.fx.start(-this.currentIndex * this.options.size + this.options.offset);
            return;
        }
        var others = [];
        for (var i = 0; i < this.items.length; i++) {
            this.items[i].fx.stop();
            if (i != this.currentIndex && i != this.lastIndex) others.push(this.items[i]);
        }
        $$(others).setStyle('display', 'none');
        if (this.lastIndex == this.currentIndex) {
            this.items[this.currentIndex].setStyles({ 'display': 'block', 'opacity': 1 });
        } else {
            this.items[this.currentIndex].setStyles({ 'display': 'block', 'opacity': 0, 'z-index': 10 });
            this.items[this.lastIndex].setStyles({ 'z-index': 9 });
        }
        if (this.options.animation.test(/fade/)) {
            this.items[this.lastIndex].fx.start(0);
            this.items[this.currentIndex].fx.start(1);
            return;
        }
    },

    addHandleButtons: function(handles) {
        for (var i = 0; i < handles.length; i++) {
            handles[i].addEvent(this.options.handle_event, this.walk.bind(this, [i, true]));
            this.allbuttons.push(handles[i]);
        }
        //handles.addEvent(this.options.handle_event, function(){this.blur();});
    },

    addActionButtons: function(action, buttons) {
        for (var i = 0; i < buttons.length; i++) {
            switch (action) {
                case 'previous': buttons[i].addEvent(this.options.button_event, this.previous.bind(this, true)); break;
                case 'next': buttons[i].addEvent(this.options.button_event, this.next.bind(this, true)); break;
                case 'play': buttons[i].addEvent(this.options.button_event, this.play.bind(this, [this.options.interval, 'next', false])); break;
                case 'playback': buttons[i].addEvent(this.options.button_event, this.play.bind(this, [this.options.interval, 'previous', false])); break;
                case 'stop': buttons[i].addEvent(this.options.button_event, this.stop.bind(this)); break;
            }
            this.buttons[action].push(buttons[i]);
            buttons[i].addEvent(this.options.button_event, function() { this.blur(); });
            this.allbuttons.push(buttons[i]);
        }
    }

});