/**
 * SqueezeBox - Expandable Lightbox
 *
 * Allows to open various content as modal,
 * centered and animated box.
 *
 * Inspired by
 *  ... Lokesh Dhakar   - The original Lightbox v2
 *  ... Cody Lindley    - ThickBox
 *
 * @version     1.0rc1
 *
 * @license     MIT-style license
 * @author      Harald Kirschner <mail [at] digitarald.de>
 * @copyright   Author
 */
var SqueezeBox = {

    presets: {
        size: {x: 600, y: 450},
        sizeLoading: {x: 200, y: 150},
        marginInner: {x: 20, y: 20},
        marginImage: {x: 150, y: 200},
        handler: false,
        adopt: null,
        closeWithOverlay: true,
        zIndex: 65555,
        overlayOpacity: 0.7,
        classWindow: '',
        classOverlay: '',
        disableFx: false,
        onOpen: Class.empty,
        onClose: Class.empty,
        onUpdate: Class.empty,
        onResize: Class.empty,
        onMove: Class.empty,
        onShow: Class.empty,
        onHide: Class.empty,
        fxOverlayDuration: 250,
        fxResizeDuration: 750,
        fxContentDuration: 250,
        ajaxOptions: {}
    },

    initialize: function(options) {
        if (this.options) return this;
        this.presets = $merge(this.presets, options)
        this.setOptions(this.presets);
        this.build();
        this.listeners = {
            window: this.reposition.bind(this, [null]),
            close: this.close.bind(this),
            key: this.onkeypress.bind(this)};
        this.isOpen = this.isLoading = false;
        this.window.close = this.listeners.close;
        return this;
    },

    build: function() {
        this.overlay = new Element('div', {
            id: 'sbox-overlay',
            styles: {
                display: 'none',
                zIndex: this.options.zIndex
            }
        });
        this.content = new Element('div', {
            id: 'sbox-content'
        });
        this.btnClose = new Element('a', {
            id: 'sbox-btn-close',
            href: '#'
        });
        this.window = new Element('div', {
            id: 'sbox-window',
            styles: {
                display: 'none',
                zIndex: this.options.zIndex + 2
            }
        }).adopt(this.btnClose, this.content);

        if (!window.ie6) {
            this.overlay.setStyles({
                position: 'fixed',
                top: 0,
                left: 0
            });
            this.window.setStyles({
                position: 'fixed',
                top: '50%',
                left: '50%'
            });
        } else {
            this.overlay.style.setExpression('marginTop', 'document.documentElement.scrollTop + "px"');
            this.window.style.setExpression('marginTop', '0 - parseInt(this.offsetHeight / 2) + document.documentElement.scrollTop + "px"');

            this.overlay.setStyles({
                position: 'absolute',
                top: '0%',
                left: '0%'
                //,marginTop: "expression(document.documentElement.scrollTop + 'px')"
            });

            this.window.setStyles({
                position: 'absolute',
                top: '0%',
                left: '0%'
                //,marginTop: "(expression(0 - parseInt(this.offsetHeight / 2) + document.documentElement.scrollTop + 'px')"
            });
        }

        $(document.body).adopt(this.overlay, this.window);

        this.fx = {
            overlay: this.overlay.effect('opacity', {
                duration: this.options.fxOverlayDuration,
                wait: false}).set(0),
            window: this.window.effects({
                duration: this.options.fxResizeDuration,
                wait: false}),
            content: this.content.effect('opacity', {
                duration: this.options.fxContentDuration,
                wait: false}).set(0)
        };
    },

    addClick: function(el) {
        return el.addEvent('click', function() {
            if (this.fromElement(el)) return false;
        }.bind(this));
    },

    fromElement: function(el, options) {
        this.initialize();
        this.element = $(el);
        if (this.element && this.element.rel) options = $merge(options || {}, Json.evaluate(this.element.rel));
        this.setOptions(this.presets, options);
        this.assignOptions();
        this.url = (this.element ? (this.options.url || this.element.href) : el) || '';

        if (this.options.handler) {
            var handler = this.options.handler;
            return this.setContent(handler, this.parsers[handler].call(this, true));
        }
        var res = false;
        for (var key in this.parsers) {
            if ((res = this.parsers[key].call(this))) return this.setContent(key, res);
        }
        return this;
    },

    assignOptions: function() {
        this.overlay.setProperty('class', this.options.classOverlay);
        this.window.setProperty('class', this.options.classWindow);
    },

    close: function(e) {
        if (e) new Event(e).stop();
        if (!this.isOpen) return this;
        this.fx.overlay.start(0).chain(this.toggleOverlay.bind(this));
        this.window.setStyle('display', 'none');
        this.trashImage();
        this.toggleListeners();
        this.isOpen = null;
        this.fireEvent('onClose', [this.content]).removeEvents();
        this.options = {};
        this.setOptions(this.presets).callChain();
        return this;
    },

    onError: function() {
        if (this.image) this.trashImage();
        this.setContent('Error during loading');
    },

    trashImage: function() {
        if (this.image) this.image = this.image.onload = this.image.onerror = this.image.onabort = null;
    },

    setContent: function(handler, content) {
        this.content.setProperty('class', 'sbox-content-' + handler);
        this.applyTimer = this.applyContent.delay(this.fx.overlay.options.duration, this, [this.handlers[handler].call(this, content)]);
        if (this.overlay.opacity) return this;
        this.toggleOverlay(true);
        this.fx.overlay.start(this.options.overlayOpacity);
        this.reposition();
        return this;
    },

    applyContent: function(content, size) {
        this.applyTimer = $clear(this.applyTimer);
        this.hideContent();
        if (!content) this.toggleLoading(true);
        else {
            if (this.isLoading) this.toggleLoading(false);
            this.fireEvent('onUpdate', [this.content], 20);
        }
        this.content.empty()[['string', 'array', false].contains($type(content)) ? 'setHTML' : 'adopt'](content || '');
        this.callChain();
        if (!this.isOpen) {
            this.toggleListeners(true);
            this.resize(size, true);
            this.isOpen = true;
            this.fireEvent('onOpen', [this.content]);
        } else this.resize(size);
    },

    resize: function(size, instantly) {
        var sizes = window.getSize();
        this.size = $merge(this.isLoading ? this.options.sizeLoading : this.options.size, size);
        var to = {
            width: this.size.x,
            height: this.size.y,
            marginLeft: - this.size.x / 2,
            marginTop: - this.size.y / 2
            //left: (sizes.scroll.x + (sizes.size.x - this.size.x - this.options.marginInner.x) / 2).toInt(),
            //top: (sizes.scroll.y + (sizes.size.y - this.size.y - this.options.marginInner.y) / 2).toInt()
        };
        $clear(this.showTimer || null);
        this.hideContent();
        if (!instantly) this.fx.window.start(to).chain(this.showContent.bind(this));
        else {
            this.window.setStyles(to).setStyle('display', '');
            this.showTimer = this.showContent.delay(50, this);
        }
        this.reposition(sizes);
    },

    toggleListeners: function(state) {
        var task = state ? 'addEvent' : 'removeEvent';
        this.btnClose[task]('click', this.listeners.close);
        if (this.options.closeWithOverlay) this.overlay[task]('click', this.listeners.close);
        document[task]('keydown', this.listeners.key);
        window[task]('resize', this.listeners.window);
        window[task]('scroll', this.listeners.window);
    },

    toggleLoading: function(state) {
        this.isLoading = state;
        this.window[state ? 'addClass' : 'removeClass']('sbox-loading');
        if (state) this.fireEvent('onLoading', [this.window]);
    },

    toggleOverlay: function(state) {
        this.overlay.setStyle('display', state ? '' : 'none');
        $(document.body)[state ? 'addClass' : 'removeClass']('body-overlayed');
    },

    showContent: function() {
        if (this.content.opacity) this.fireEvent('onShow', [this.window]);
        this.fx.content.start(1);
    },

    hideContent: function() {
        if (!this.content.opacity) this.fireEvent('onHide', [this.window]);
        this.fx.content.stop().set(0);
    },

    onkeypress: function(e) {
        switch (e.key) {
            case 'esc':
            case 'x':
                this.close();
                break;
        }
    },

    reposition: function(sizes) {
        sizes = sizes || window.getSize();
        this.overlay.setStyles({
            //'left': sizes.scroll.x, 'top': sizes.scroll.y,
            width: sizes.size.x,
            height: sizes.size.y
        });
        /*
        this.window.setStyles({
            left: (sizes.scroll.x + (sizes.size.x - this.window.offsetWidth) / 2).toInt(),
            top: (sizes.scroll.y + (sizes.size.y - this.window.offsetHeight) / 2).toInt()
        });
        */
        this.fireEvent('onMove', [this.overlay, this.window, sizes]);
    },

    removeEvents: function(type){
        if (!this.$events) return this;
        if (!type) this.$events = null;
        else if (this.$events[type]) this.$events[type] = null;
        return this;
    },

    parsers: {
        'image': function(preset) {
            return (preset || this.url.test(/\.(jpg|jpeg|png|gif|bmp)$/i)) ? this.url : false;
        },
        'adopt': function(preset) {
            if ($(this.options.adopt)) return $(this.options.adopt);
            if (preset || ($(this.element) && !this.element.parentNode)) return $(this.element);
            var bits = this.url.match(/#([\w-]+)$/);
            return bits ? $(bits[1]) : false;
        },
        'url': function(preset) {
            return (preset || (this.url && !this.url.test(/^javascript:/i))) ? this.url: false;
        },
        'iframe': function(preset) {
            return (preset || this.url) ? this.url: false;
        },
        'string': function(preset) {
            return true;
        }
    },

    handlers: {
        'image': function(url) {
            this.image = new Image();
            var events = {
                loaded: function() {
                    var win = {x: window.getWidth() - this.options.marginImage.x, y: window.getHeight() - this.options.marginImage.y};
                    var size = {x: this.image.width, y: this.image.height};
                    for (var i = 0; i < 2; i++)
                        if (size.x > win.x) {
                            size.y *= win.x / size.x;
                            size.x = win.x;
                        } else if (size.y > win.y) {
                            size.x *= win.y / size.y;
                            size.y = win.y;
                        }
                    size = {x: parseInt(size.x), y: parseInt(size.y)};
                    if (window.webkit419) this.image = new Element('img', {'src': this.image.src});
                    else $(this.image);
                    this.image.setProperties({
                        'width': size.x,
                        'height': size.y});
                    this.applyContent(this.image, size);
                }.bind(this),
                failed: this.onError.bind(this)
            };
            (function() {
                this.src = url;
            }).delay(10, this.image);
            this.image.onload = events.loaded;
            this.image.onerror = this.image.onabort = events.failed;
        },
        'adopt': function(el) {
            return el.clone();
        },
        'url': function(url) {
            this.ajax = new Ajax(url, this.options.ajaxOptions);
            this.ajax.addEvent('onSuccess', function(resp) {
                this.applyContent(resp);
                this.ajax = null;
            }.bind(this));
            this.ajax.addEvent('onFailure', this.onError.bind(this));
            this.ajax.request.delay(10, this.ajax);
        },
        'iframe': function(url) {
            return new Element('iframe', {
                'src': url,
                'frameBorder': 0,
                'width': this.options.size.x,
                'height': this.options.size.y
            });
        },
        'string': function(str) {
            return str;
        }
    },

    extend: $extend
};

SqueezeBox.extend(Events.prototype);
SqueezeBox.extend(Options.prototype);
SqueezeBox.extend(Chain.prototype);