/*
This file is part of JonDesign's SmoothSlideshow v2.0.

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 = 12000;
        this.articleLink = "";
        this.slideInfoZone = "";

        element.style.display = "block";

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

        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.setStyle('opacity', 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)].setStyle('opacity', 1);
        setTimeout(this.showInfoSlideShow.bind(this), 1000);
        setTimeout(this.hideInfoSlideShow.bind(this), this.slideShowDelay - 1000);
        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)].setStyle('opacity', 0);
                } .bind(this);
                this.slideElements[parseInt(this.currentIter)].currentOpacity.custom(0, 1);
            } else {
                this.slideElements[parseInt(this.currentIter)].setStyle('opacity', 1);
                this.slideElements[parseInt(this.lastIter)].currentOpacity.custom(1, 0);
            }
            setTimeout(this.showInfoSlideShow.bind(this), 1000);
            setTimeout(this.hideInfoSlideShow.bind(this), this.slideShowDelay - 1000);
            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.setStyle('opacity', 0);
        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.getStyle('height', true).toInt();
        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();
        }
    }
}