/*
    This file is part of JonDesign's SmoothSlideshow v2.1.

    JonDesign's SmoothSlideshow is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    JonDesign's SmoothSlideshow is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Foobar; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Main Developer: Jonathan Schemoul (JonDesign: http://www.jondesign.net/)
    Contributed code by:
    - Christian Ehret (bugfix)
    - Simon Willison (addLoadEvent)
*/

// declaring the class
var timedSlideShow = Class.create();

// implementing the class
timedSlideShow.prototype = {
        initialize: function(element, data) {
                this.currentIter = 0;
                this.lastIter = 0;
                this.maxIter = 0;
                this.slideShowElement = element;
                this.slideShowData = data;
                this.slideShowInit = 1;
                this.slideElements = Array();
                this.slideShowDelay = 9000;
                this.articleLink = "";
                this.slideInfoZone = "";

                element.style.display="block";

                this.articleLink = document.createElement('a');
                this.articleLink.className = 'global';
                element.appendChild(this.articleLink);
                this.articleLink.href = "javascript:void(0);";

                this.maxIter = data.length;
                for(i=0;i<data.length;i++)
                {
                        var currentImg = document.createElement('div');
                        currentImg.className = "slideElement";
                        currentImg.style.position="absolute";
                        currentImg.style.left="0px";
                        currentImg.style.top="0px";
                        currentImg.style.margin="0px";
                        currentImg.style.border="0px";
                        currentImg.style.backgroundImage="url('" + data[i][0] + "')";
                        currentImg.style.backgroundPosition="center center";

                        this.articleLink.appendChild(currentImg);
                        currentImg.currentOpacity = new fx.Opacity(currentImg, {duration: 400});
                        currentImg.currentOpacity.set(0);
                        this.slideElements[parseInt(i)] = currentImg;
                }

                this.loadingElement = document.createElement('div');
                this.loadingElement.className = 'loadingElement';
                this.articleLink.appendChild(this.loadingElement);

                this.slideInfoZone = document.createElement('div');
                this.slideInfoZone.className = 'slideInfoZone';
                this.articleLink.appendChild(this.slideInfoZone);
                this.slideInfoZone.style.opacity = 0;

                this.doSlideShow();
        },
        destroySlideShow: function(element) {
                var myClassName = element.className;
                var newElement = document.createElement('div');
                newElement.className = myClassName;
                element.parentNode.replaceChild(newElement, element);
        },
        startSlideShow: function() {
                this.loadingElement.style.display = "none";
                this.lastIter = this.maxIter - 1;
                this.currentIter = 0;
                this.slideShowInit = 0;
                this.slideElements[parseInt(this.currentIter)].currentOpacity.set(1);
                setTimeout(this.showInfoSlideShow.bind(this),500);
                setTimeout(this.hideInfoSlideShow.bind(this),this.slideShowDelay-500);
                setTimeout(this.nextSlideShow.bind(this),this.slideShowDelay);
        },
        nextSlideShow: function() {
                this.lastIter = this.currentIter;
                this.currentIter++;
                if (this.currentIter >= this.maxIter)
                {
                        this.currentIter = 0;
                        this.lastIter = this.maxIter - 1;
                }
                this.slideShowInit = 0;
                this.doSlideShow.bind(this)();
        },
        doSlideShow: function() {
                if (this.slideShowInit == 1)
                {
                        imgPreloader = new Image();
                        // once image is preloaded, start slideshow
                        imgPreloader.onload=function(){
                                setTimeout(this.startSlideShow.bind(this),10);
                        }.bind(this);
                        imgPreloader.src = this.slideShowData[0][0];
                } else {
                        if (this.currentIter != 0) {
                                this.slideElements[parseInt(this.currentIter)].currentOpacity.options.onComplete = function() {
                                        this.slideElements[parseInt(this.lastIter)].currentOpacity.set(0);
                                }.bind(this);
                                this.slideElements[parseInt(this.currentIter)].currentOpacity.custom(0, 1);
                        } else {
                                this.slideElements[parseInt(this.currentIter)].currentOpacity.set(1);
                                this.slideElements[parseInt(this.lastIter)].currentOpacity.custom(1, 0);
                        }
                        setTimeout(this.showInfoSlideShow.bind(this),500);
                        setTimeout(this.hideInfoSlideShow.bind(this),this.slideShowDelay-500);
                        setTimeout(this.nextSlideShow.bind(this),this.slideShowDelay);
                }
        },
        showInfoSlideShow: function() {
                this.articleLink.removeChild(this.slideInfoZone);
                this.slideInfoZone = document.createElement('div');
                this.slideInfoZone.styles = new fx.Styles(this.slideInfoZone);
                this.slideInfoZone.style.visibility = "hidden";
                var slideInfoZoneTitle = document.createElement('h2');
                slideInfoZoneTitle.innerHTML = this.slideShowData[this.currentIter][2]
                this.slideInfoZone.appendChild(slideInfoZoneTitle);
                var slideInfoZoneDescription = document.createElement('p');
                slideInfoZoneDescription.innerHTML = this.slideShowData[this.currentIter][3];
                this.slideInfoZone.appendChild(slideInfoZoneDescription);
                this.articleLink.appendChild(this.slideInfoZone);
                this.articleLink.href = this.slideShowData[this.currentIter][1];
                this.slideInfoZone.className = 'slideInfoZone';
                this.slideInfoZone.normalHeight = this.slideInfoZone.offsetHeight;
                this.slideInfoZone.styles.custom({'opacity': [0, 0.7], 'height': [0, this.slideInfoZone.normalHeight]});
        },
        hideInfoSlideShow: function() {
                this.slideInfoZone.styles.custom({'opacity': [0.7, 0]});
        }
};

function initTimedSlideShow(element, data) {
        var slideshow = new timedSlideShow(element, data);
}

function addLoadEvent(func) {
        var oldonload = window.onload;
        if (typeof window.onload != 'function') {
                window.onload = func;
        } else {
                window.onload = function() {
                        oldonload();
                        func();
                }
        }
}