/*
 Created By: Chris Campbell
 Website: http://particletree.com
 Date: 2/1/2006

 Inspired by the lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
 */

/*-------------------------------GLOBAL VARIABLES------------------------------------*/

var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;
var validLightboxes = [];
var maxLightboxWait = 0;

/*-----------------------------------------------------------------------------------------------*/

//Browser detect script origionally created by Peter Paul Koch at http://www.quirksmode.org/

function getBrowserInfo() {
    if (checkIt('konqueror')) {
        browser = "Konqueror";
        OS = "Linux";
    }
    else if (checkIt('safari')) browser = "Safari"
    else if (checkIt('omniweb')) browser = "OmniWeb"
        else if (checkIt('opera')) browser = "Opera"
            else if (checkIt('webtv')) browser = "WebTV";
                else if (checkIt('icab')) browser = "iCab"
                    else if (checkIt('msie')) browser = "Internet Explorer"
                        else if (!checkIt('compatible')) {
                                browser = "Netscape Navigator"
                                version = detect.charAt(8);
                            }
                            else browser = "An unknown browser";

    if (!version) version = detect.charAt(place + thestring.length);

    if (!OS) {
        if (checkIt('linux')) OS = "Linux";
        else if (checkIt('x11')) OS = "Unix";
        else if (checkIt('mac')) OS = "Mac"
            else if (checkIt('win')) OS = "Windows"
                else OS = "an unknown operating system";
    }
}

function checkIt(string) {
    place = detect.indexOf(string) + 1;
    thestring = string;
    return place;
}


/**
 * This is a workaround for IE's lack of getElementsByClassName function.
 * 
 * @param className
 */
function getAtagWithClassName(className) {
    var aTags = new Array();
    var i = 0;
    var a = document.getElementsByTagName("a");
    while (element = a[i++]) {
        if (element.className == className) {
            aTags.push(element);
        }
    }
    return aTags;
}
/*-----------------------------------------------------------------------------------------------*/

Event.observe(window, 'load', initializeLightboxes, false);
Event.observe(window, 'load', getBrowserInfo, false);

var lightbox = Class.create();

lightbox.prototype = {

    yPos : 0,
    xPos : 0,

    initialize: function(ctrl) {

        this.content = ctrl.href;
        this.ctrlId = ctrl.id;
        Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
        ctrl.onclick = function() {
            return false;
        };
    },

    // Turn everything on - mainly the IE fixes
    activate: function() {
        if (browser == 'Internet Explorer') {
            this.getScroll();
            this.prepareIE('100%', 'hidden');
            this.setScroll(0, 0);
            this.hideSelects('hidden');
        }
        this.displayLightbox("block");
    },

    // Ie requires height to 100% and overflow hidden or else you can scroll down past the lightbox
    prepareIE: function(height, overflow) {
        bod = document.getElementsByTagName('body')[0];
        bod.style.height = height;
        bod.style.overflow = overflow;

        htm = document.getElementsByTagName('html')[0];
        htm.style.height = height;
        htm.style.overflow = overflow;
    },

    // In IE, select elements hover on top of the lightbox
    hideSelects: function(visibility) {
        selects = document.getElementsByTagName('select');
        for (i = 0; i < selects.length; i++) {
            selects[i].style.visibility = visibility;
        }
    },

    // Taken from lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
    getScroll: function() {
        if (self.pageYOffset) {
            this.yPos = self.pageYOffset;
        } else if (document.documentElement && document.documentElement.scrollTop) {
            this.yPos = document.documentElement.scrollTop;
        } else if (document.body) {
            this.yPos = document.body.scrollTop;
        }
    },

    setScroll: function(x, y) {
        window.scrollTo(x, y);
    },

    displayLightbox: function(display) {
        $('overlay').style.display = display;
        $('lightbox').style.display = display;
        if (display != 'none') this.loadInfo();
    },

    // Begin Ajax request based off of the href of the clicked linked
    loadInfo: function() {
        var myAjax = new Ajax.Request(
                this.content,
        {method: 'get', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
                );

    },

    // Display Ajax response
    processInfo: function(response) {
        info = "<div id='lbContent'>" + response.responseText + "</div>";
        new Insertion.Before($('lbLoadMessage'), info)
        $('lightbox').className = "done";
        this.actions();
    },

    // Search through new links within the lightbox, and attach click event
    actions: function() {
        lbActions = getAtagWithClassName('lbAction');

        for (i = 0; i < lbActions.length; i++) {
            Event.observe(lbActions[i], 'click', this[lbActions[i].rel].bindAsEventListener(this), false);
            lbActions[i].onclick = function() {
                return false;
            };
        }

    },

    // Example of creating your own functionality once lightbox is initiated
    insert: function(e) {
        link = Event.element(e).parentNode;
        Element.remove($('lbContent'));

        var myAjax = new Ajax.Request(
                link.href,
        {method: 'get', parameters: "", onComplete: this.processInfo.bindAsEventListener(this)}
                );

    },

    // Example of creating your own functionality once lightbox is initiated
    deactivate: function() {
        Element.remove($('lbContent'));

        if (browser == "Internet Explorer") {
            this.setScroll(0, this.yPos);
            this.prepareIE("auto", "auto");
            this.hideSelects("visible");
        }

        this.displayLightbox("none");
    }
}

/*-----------------------------------------------------------------------------------------------*/

// Onload, make all links that need to trigger a lightbox active
function initializeLightboxes() {
    addLightboxMarkup();
    var lbox = getAtagWithClassName('lbOn');
    for (i = 0; i < lbox.length; i++) {
        validLightboxes[i] = new lightbox(lbox[i]);
    }
}



// Add in markup necessary to make this work. Basically two divs:
// Overlay holds the shadow
// Lightbox is the centered square that the content is put into.
function addLightboxMarkup() {
    var body = document.getElementsByTagName('body')[0];
    var overlayDiv = document.createElement('div');
    overlayDiv.id = 'overlay';

    var lighBoxDiv = document.createElement('div');
    lighBoxDiv.id = 'lightbox';
    lighBoxDiv.className = 'loading';
    lighBoxDiv.innerHTML = '<div id="lbLoadMessage"><p>Loading</p></div>';

    body.appendChild(overlayDiv);
    body.appendChild(lighBoxDiv);
}

/**
 * Displays a lightbox with the given id.
 *
 * Method uses the 'setTimeout' method as a dirty way of getting things displayed correct in
 * all browsers, as it simply wait for all onload events set in lightbox.js to complete before
 * displaying the given lightbox.
 *
 * @param lightboxId the id of the lightbox to display
 */
function showLightBox(lightboxId) {
    if (lightboxId == null || lightboxId == '') {
        return;
    }

    if (validLightboxes == null || validLightboxes.length == 0 || browser == null || browser == '') {
        if (maxLightboxWait >= 10) {
            maxLightboxWait = 0;
            return; // Avoid infinite loop.
        }
        setTimeout(function() {
            maxLightboxWait++;
            showLightBox(lightboxId);
        }, 200);
    } else {
        for (i = 0; i < validLightboxes.length; i++) {
            var tempLightBox = validLightboxes[i];
            if (tempLightBox.ctrlId == lightboxId) {
                tempLightBox.activate();
                break;
            }
        }
        maxLightboxWait = 0;
    }
}