/**
 * ReMooz - Zoomer
 *
 * Inspired by so many boxes and zooms
 *
 * @version		1.0
 *
 * @license		MIT-style license
 * @author		Harald Kirschner <mail [at] digitarald.de>
 * @copyright	Author
 */

var ReMooz = new Class({

    Implements: [Events, Options, Chain],

    options: {
        link: null,
        type: 'image',
        container: null,
        className: null,
        centered: false,
        dragging: true,
        closeOnClick: true,
        shadow: (Browser.Engine.trident) ? 'onOpenEnd' : 'onOpen', // performance
        resize: true,
        margin: 20,
        resizeFactor: 0.95,
        resizeLimit: false, // {x: 640, y: 640}
        fixedSize: false,
        cutOut: true,
        addClick: true,
        opacityLoad: 0.6,
        opacityResize: 1,
        opacityTitle: 0.9,
        resizeOptions: {},
        fxOptions: {},
        closer: true,
        parse: false, // 'rel'
        parseSecure: false,
        temporary: false,
        onBuild: $empty,
        onLoad: $empty,
        onOpen: $empty,
        onOpenEnd: $empty,
        onClose: $empty,
        onCloseEnd: $empty,
        generateTitle: function(el) {
            var text = el.get('title');
            if (!text) return false;
            var title = text.split(' :: ');
            var head = new Element('h6', { 'html': title[0] });
            return (title[1]) ? [head, new Element('p', { 'html': title[1] })] : head;
        }
    },

    initialize: function(element, options) {
        this.element = $(element);        
        this.setOptions(options);
        if (this.options.parse) {
            var obj = this.element.getProperty(this.options.parse);
            if (obj && (obj = JSON.decode(obj, this.options.parseSecure))) this.setOptions(obj);
        }
        var origin = this.options.origin;
        this.origin = ((origin) ? $(origin) || this.element.getElement(origin) : null) || this.element;
        this.link = this.options.link || this.element.get('href') || this.element.get('src');
        this.container = $(this.options.container) || this.element.getDocument();
        this.bound = {
            'click': function(e) {
                this.open.delay(1, this);
                return false;
            } .bind(this),
            'close': this.close.bind(this),
            'dragClose': function(e) {
                if (e.rightClick) return;
                this.close();
            } .bind(this)
        };
        if (this.options.addClick) this.bindToElement();
    },

    destroy: function() {
        if (this.box) this.box.destroy();
        this.box = this.tweens = this.body = this.content = null;
    },

    bindToElement: function(element) {
        ($(element) || this.element).addClass('remooz-element').addEvent('click', this.bound.click);
        return this;
    },

    getOriginCoordinates: function() {
        var coords = this.origin.getCoordinates();
        delete coords.right;
        delete coords.bottom;
        return coords;
    },

    open: function(e) {
        if (this.opened) return (e) ? this.close() : this;
        this.opened = this.loading = true;
        if (!this.box) this.build();
        this.coords = this.getOriginCoordinates();
        this.coords.opacity = this.options.opacityLoad;
        this.coords.display = '';
        this.tweens.box.set(this.coords);
        this.box.addClass('remooz-loading');
        ReMooz.open(this.fireEvent('onLoad'));
        this['open' + this.options.type.capitalize()]();
        return this;
    },

    finishOpen: function() {
        this.tweens.fade.start(0, 1);
        this.drag.attach();
        this.fireEvent('onOpenEnd').callChain();
    },

    close: function() {
        if (!this.opened) return this;
        this.opened = false;
        ReMooz.close(this.fireEvent('onClose'));
        if (this.loading) {
            this.box.setStyle('display', 'none');
            return this;
        }
        this.drag.detach();
        this.tweens.fade.cancel().set(0).fireEvent('onComplete');
        if (this.tweens.box.timer) this.tweens.box.clearChain();
        var vars = this.getOriginCoordinates();
        if (this.options.opacityResize != 1) vars.opacity = this.options.opacityResize;
        this.tweens.box.start(vars).chain(this.closeEnd.bind(this));
        return this;
    },

    closeEnd: function() {
        if (this.options.cutOut) this.element.setStyle('visibility', 'visible');
        this.box.setStyle('display', 'none');
        this.fireEvent('onCloseEnd').callChain();
        if (this.options.temporary) this.destroy();
    },

    openImage: function() {
        var tmp = new Image();
        tmp.onload = tmp.onabort = tmp.onerror = function(fast) {
            this.loading = tmp.onload = tmp.onabort = tmp.onerror = null;
            if (!tmp.width || !this.opened) {
                this.fireEvent('onError').close();
                return;
            }
            var to = { x: tmp.width, y: tmp.height };
            if (!this.content) this.content = $(tmp).inject(this.body);
            else tmp = null;
            this[(this.options.resize) ? 'zoomRelativeTo' : 'zoomTo'].create({
                'delay': (tmp && fast !== true) ? 1 : null,
                'arguments': [to],
                'bind': this
            })();
        } .bind(this);
        tmp.src = this.link;
        if (tmp && tmp.complete && tmp.onload) tmp.onload(true);
    },

    /**
    * @todo Test implementation
    */
    openElement: function() {
        this.content = this.content || $(this.link) || $E(this.link);
        if (!this.content) {
            this.fireEvent('onError').close();
            return;
        }
        this.content.inject(this.body);
        this.zoomTo({ x: this.content.scrollWidth, y: this.content.scrollHeight });
    },

    zoomRelativeTo: function(to) {
        var scale = this.options.resizeLimit;
        if (!scale) {
            scale = this.container.getSize();
            scale.x *= this.options.resizeFactor;
            scale.y *= this.options.resizeFactor;
        }
        for (var i = 2; i--; ) {
            if (to.x > scale.x) {
                to.y *= scale.x / to.x;
                to.x = scale.x;
            } else if (to.y > scale.y) {
                to.x *= scale.y / to.y;
                to.y = scale.y;
            }
        }
        return this.zoomTo({ x: to.x.toInt(), y: to.y.toInt() });
    },

    zoomTo: function(to) {
        to = this.options.fixedSize || to;
        var box = this.container.getSize(), scroll = this.container.getScroll();
        var pos = (!this.options.centered) ? {
            x: (this.coords.left + (this.coords.width / 2) - to.x / 2).toInt()
				.limit(scroll.x + this.options.margin, scroll.x + box.x - this.options.margin - to.x),
            y: (this.coords.top + (this.coords.height / 2) - to.y / 2).toInt()
				.limit(scroll.y + this.options.margin, scroll.y + box.y - this.options.margin - to.y)
} : {
    x: scroll.x + ((box.x - to.x) / 2).toInt(),
    y: scroll.y + ((box.y - to.y) / 2).toInt()
};
            if (this.options.cutOut) this.element.setStyle('visibility', 'hidden');
            this.box.removeClass('remooz-loading');
            var vars = { left: pos.x, top: pos.y, width: to.x, height: to.y };
            if (this.options.opacityResize != 1) vars.opacity = [this.options.opacityResize, 1];
            else this.box.set('opacity', 1);
            this.tweens.box.start(vars).chain(this.finishOpen.bind(this));
            this.fireEvent('onOpen');
        },

        build: function() {
            this.addEvent('onBlur', function() {
                this.focused = false;
                this.box.removeClass('remooz-box-focus').setStyle('z-index', ReMooz.options.zIndex);
            }, true);
            this.addEvent('onFocus', function() {
                this.focused = true;
                this.box.addClass('remooz-box-focus').setStyle('z-index', ReMooz.options.zIndexFocus);
            }, true);

            var classes = ['remooz-box', 'remooz-type-' + this.options.type, 'remooz-engine-' + Browser.Engine.name + Browser.Engine.version];
            if (this.options.className) classes.push(this.options.className);
            this.box = new Element('div', {
                'class': classes.join(' '),
                'styles': {
                    'display': 'none',
                    'top': 0,
                    'left': 0,
                    'zIndex': ReMooz.options.zIndex
                }
            });

            this.tweens = {
                'box': new Fx.Morph(this.box, $merge({
                    'duration': 400,
                    'unit': 'px',
                    'transition': Fx.Transitions.Quart.easeOut,
                    'chain': 'cancel'
                }, this.options.resizeOptions)
			),
                'fade': new Fx.Tween(null, $merge({
                    'property': 'opacity',
                    'duration': (Browser.Engine.trident) ? 0 : 300,
                    'chain': 'cancel'
                }, this.options.fxOptions)).addEvents({
                    'onComplete': function() {
                        if (!this.element.get('opacity')) this.element.setStyle('display', 'none');
                    },
                    'onStart': function() {
                        if (!this.element.get('opacity')) this.element.setStyle('display', '');
                    }
                }
			)
            };
            this.tweens.fade.element = $$();

            if (this.options.shadow) {
                if (Browser.Engine.webkit420) {
                    this.box.setStyle('-webkit-box-shadow', '0 0 10px rgba(0, 0, 0, 0.7)');
                } else if (!Browser.Engine.trident4) {
                    var shadow = new Element('div', { 'class': 'remooz-bg-wrap' }).inject(this.box);
                    ['n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw'].each(function(dir) {
                        new Element('div', { 'class': 'remooz-bg remooz-bg-' + dir }).inject(shadow);
                    });
                    this.tweens.bg = new Fx.Tween(shadow, {
                        'property': 'opacity',
                        'chain': 'cancel'
                    }).set(0);
                    this.addEvent(this.options.shadow, this.tweens.bg.set.bind(this.tweens.bg, 1), true);
                    this.addEvent('onClose', this.tweens.bg.set.bind(this.tweens.bg, 0), true);
                }
            }

            if (this.options.closer) {
                var closer = new Element('a', {
                    'class': 'remooz-btn-close',
                    'events': { 'click': this.bound.close }
                }).inject(this.box);
                this.tweens.fade.element.push(closer);
            }
            this.body = new Element('div', { 'class': 'remooz-body' }).inject(this.box);

            var title = this.options.title || this.options.generateTitle.call(this, this.element);
            if (title) { // thx ie6
                var title = new Element('div', { 'class': 'remooz-title' }).adopt(
				new Element('div', { 'class': 'remooz-title-bg', 'opacity': this.options.opacityTitle }),
				new Element('div', { 'class': 'remooz-title-content' }).adopt(title)
			).inject(this.box);
                this.tweens.fade.element.push(title);
            }
            this.tweens.fade.set(0).fireEvent('onComplete');

            this.drag = new Drag.Move(this.box, {
                'snap': 15,
                'preventDefault': true,
                'onBeforeStart': function() {
                    if (!this.focused && !this.loading) ReMooz.focus(this);
                    else if (this.loading || this.options.closeOnClick) this.box.addEvent('mouseup', this.bound.dragClose);
                } .bind(this),
                'onSnap': function() {
                    this.box.removeEvent('mouseup', this.bound.dragClose);
                    if (!this.options.dragging) this.drag.stop();
                    else this.box.addClass('remooz-box-dragging');
                } .bind(this),
                'onComplete': function() {
                    this.box.removeClass('remooz-box-dragging');
                } .bind(this)
            });
            this.drag.detach();

            this.fireEvent('onBuild', this.box, this.element);
            this.box.inject(this.element.getDocument().body);
        }

    });

ReMooz.factory = function(extended) {
	return $extend(this, extended);
};

ReMooz.factory(new Options).factory({

	options: {
		zIndex: 41,
		zIndexFocus: 42,
		query: 'a.remooz',
		modal: false
	},

	assign: function(elements, options) {
		return $$(elements).map(function(element) {
			return new ReMooz(element, options);
		}, this);
	},

	stack: [],

	open: function(obj) {
		var last = this.stack.getLast();
		this.focus(obj);
		if (last && this.options.modal) last.close();
	},

	close: function(obj) {
		var length = this.stack.length - 1;
		if (length > 1 && this.stack[length] == obj) this.focus(this.stack[length - 1]);
		this.stack.erase(obj);
	},

	focus: function(obj) {
		var last = this.stack.getLast();
		obj.fireEvent('onFocus', [obj]);
		if (last == obj) return;
		if (last) last.fireEvent('onBlur', [last]);
		this.stack.erase(obj).push(obj);
	}

});