//** Simple Controls Gallery- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Dec 7th, 08'- Script created (Requires jquery 1.2.x)
//** February 6th, 09'- Updated to v 1.3:
    //1) Adds Description Panel to optionally show a textual description for each slide
    //2) In Auto Play mode, you can now set the number of cycles before gallery stops.
    //3) Inside oninit() and onslide(), keyword "this" now references the current gallery instance

function simpleGallery(settingarg){
    this.setting=settingarg
    settingarg=null
    var setting=this.setting
    setting.panelheight=(parseInt(setting.navpanelheight)>5)? parseInt(setting.navpanelheight) : parseInt(simpleGallery_navpanel.panel.height)
    setting.fadeduration=parseInt(setting.fadeduration)
    setting.curimage=(setting.persist)? simpleGallery.routines.getCookie("gallery-"+setting.wrapperid) : 0
    setting.curimage=setting.curimage || 0 //account for curimage being null if cookie is empty
    setting.ispaused=!setting.autoplay[0] //ispaused reflects current state of gallery, autoplay[0] indicates whether gallery is set to auto play
    setting.currentstep=0 //keep track of # of slides slideshow has gone through
    setting.totalsteps=setting.imagearray.length*setting.autoplay[2] //Total steps limit: # of images x # of user specified cycles
    setting.fglayer=0, setting.bglayer=1 //index of active and background layer (switches after each change of slide)
    setting.oninit=setting.oninit || function(){}
    setting.onslide=setting.onslide || function(){}

    var slideshow=this
    jQuery(document).ready(function($) {
        var setting = slideshow.setting
        setting.$wrapperdiv = $('#' + setting.wrapperid).css({ position: 'relative', visibility: 'visible', background: 'black', overflow: 'hidden', width: setting.dimensions[0], height: setting.dimensions[1] }).empty() //main gallery DIV
        if (setting.$wrapperdiv.length == 0) { //if no wrapper DIV found
            alert("Error: DIV with ID \"" + setting.wrapperid + "\" not found on page.")
            return
        }
        setting.$gallerylayers = $('<div class="gallerylayer"></div><div class="gallerylayer"></div>') //two stacked DIVs to display the actual slide
            .css({ position: 'absolute', left: 0, top: 0 })
            .appendTo(setting.$wrapperdiv)
        setting.gallerylayers = setting.$gallerylayers.get() //cache stacked DIVs as DOM objects
        setting.navbuttons = simpleGallery.routines.addnavpanel(setting) //get 4 nav buttons DIVs as DOM objects
        $(setting.navbuttons).filter('img.navimages').css({ opacity: 1 })
        /*
        .bind('mouseover mouseout', function(e){
        $(this).css({opacity:(e.type=="mouseover")? 1 : 1})
        })
        */
            .bind('click', function(e) {
                var keyword = e.target.title.toLowerCase()
                slideshow.navigate(keyword) //assign behavior to nav images
            })
        /*
        setting.$wrapperdiv.bind('mouseenter', function(){slideshow.showhidenavpanel('show')})
        setting.$wrapperdiv.bind('mouseleave', function(){slideshow.showhidenavpanel('hide')})
        */
        slideshow.showhidenavpanel('show')
        slideshow.showslide(setting.curimage) //show initial slide
        setting.oninit.call(slideshow) //trigger oninit() event
        $(window).bind('unload', function() { //clean up and persist
            $(slideshow.setting.navbuttons).unbind()
            if (slideshow.setting.persist) //remember last shown image's index
                simpleGallery.routines.setCookie("gallery-" + setting.wrapperid, setting.curimage)
            jQuery.each(slideshow.setting, function(k) {
                if (slideshow.setting[k] instanceof Array) {
                    for (var i = 0; i < slideshow.setting[k].length; i++) {
                        /*if (slideshow.setting[k][i].tagName=="DIV") //catches 2 gallerylayer divs, gallerystatus div
                        slideshow.setting[k][i].innerHTML=null
                        */
                        slideshow.setting[k][i] = null
                    }
                }
                if (slideshow.setting[k].innerHTML) //catch gallerydesctext div
                    slideshow.setting[k].innerHTML = null
                slideshow.setting[k] = null
            })
            slideshow = slideshow.setting = null
        })

        var preloadimages=[]
        for (var i=1; i<setting.imagearray.length; i++){
            preloadimages[i]=new Image()
            preloadimages[i].src=setting.imagearray[i][0]
        }

    })
}

simpleGallery.prototype={

    navigate:function(keyword){
        clearTimeout(this.setting.playtimer)
        this.setting.totalsteps=100000 //if any of the nav buttons are clicked on, set totalsteps limit to an "unreachable" number
        if (!isNaN(parseInt(keyword))){
            this.showslide(parseInt(keyword) - 1)
        }
        else if (/(prev)|(next)/i.test(keyword)){
            this.showslide(keyword.toLowerCase())
        }
        else{ //if play|pause button
            var slideshow=this
            var $playbutton=$(this.setting.navbuttons).eq(1)
            if (!this.setting.ispaused){ //if pause Gallery
                this.setting.autoplay[0]=false
                //$playbutton.attr({title:'Play', src:simpleGallery_navpanel.images[1]})
            }
            else if (this.setting.ispaused){ //if play Gallery
                this.setting.autoplay[0]=true
                this.setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, this.setting.autoplay[1])
                //$playbutton.attr({title:'Pause', src:simpleGallery_navpanel.images[3]})
            }
            slideshow.setting.ispaused=!slideshow.setting.ispaused
        }
    },

    showslide:function(keyword){
        var slideshow=this
        var setting=slideshow.setting
        var totalimages=setting.imagearray.length
        if (totalimages == 0) {
            return;
        }
        var imgindex=(keyword=="next")? (setting.curimage<totalimages-1? setting.curimage+1 : 0)
            : (keyword=="prev")? (setting.curimage>0? setting.curimage-1 : totalimages-1)
            : Math.min(keyword, totalimages-1)
        setting.gallerylayers[setting.bglayer].innerHTML=simpleGallery.routines.getSlideHTML(setting.imagearray[imgindex])
        setting.$gallerylayers.eq(setting.bglayer).css({zIndex:1000, opacity:0}) //background layer becomes foreground
            .stop().css({opacity:0}).animate({opacity:1}, setting.fadeduration, function(){ //Callback function after fade animation is complete:
                clearTimeout(setting.playtimer)
                setting.gallerylayers[setting.bglayer].innerHTML=""//null  //empty bglayer (previously fglayer before setting.fglayer=setting.bglayer was set below)
                try{
                    setting.onslide.call(slideshow, setting.gallerylayers[setting.fglayer], setting.curimage)
                }catch(e){
                    alert("Simple Controls Gallery: An error has occured somwhere in your code attached to the \"onslide\" event: "+e)
                }
                setting.currentstep+=1
                if (setting.autoplay[0]){
                    if (setting.currentstep<=setting.totalsteps)
                        setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, setting.autoplay[1])
                    else
                        slideshow.navigate("play/pause")
                }
            }) //end callback function
        setting.gallerylayers[setting.fglayer].style.zIndex=999 //foreground layer becomes background
        setting.fglayer=setting.bglayer
        setting.bglayer=(setting.bglayer==0)? 1 : 0
        setting.curimage=imgindex
        //setting.navbuttons[3].innerHTML=(setting.curimage+1) + '/' + setting.imagearray.length
        if (setting.imagearray[imgindex][3]){ //if this slide contains a description
            setting.$descpanel.css({visibility:'visible'})
            setting.descdiv.innerHTML=setting.imagearray[imgindex][3]
        }
    },

    showhidenavpanel:function(state){
        var setting=this.setting
        var endpoint=(state=="show")? setting.dimensions[1]-setting.panelheight : this.setting.dimensions[1]
        setting.$navpanel.stop().animate({top:endpoint}, simpleGallery_navpanel.slideduration)
    }
}

simpleGallery.routines = {

    getSlideHTML: function(imgelement) {
        var layerHTML = "";
        if (imgelement != undefined) {
            var imgW = ' width="794" ';
            if(imgelement[0] != ""){
                var myImage = new Image();
                myImage.src = imgelement[0];
                if(myImage.width > 625 && myImage.width != 631){
                    imgW = ' width="794" ';
                }
            }

            layerHTML = (imgelement[1]) ? '<a href="' + imgelement[1] + '" target="' + imgelement[2] + '">\n' : '' //hyperlink slide?
            layerHTML += '<img'+imgW+' src="' + imgelement[0] + '" alt= "'+imgelement[4]+'" title= "'+imgelement[4]+'" style="border-width:0;'+ ((imgelement[0] == "") ? "display:none" : "") +'" />';
            layerHTML += (imgelement[1]) ? '</a>' : '';
        }
        return layerHTML //return HTML for this layer
    },

    addnavpanel: function(setting) {
        var interfaceHTML = ''
        var totalimages = setting.imagearray.length
        for (var i = 0; i < 7; i++) {
            var imgstyle = 'position:relative; border:0; cursor:hand; cursor:pointer; top:' + simpleGallery_navpanel.imageSpacing.offsetTop[i] + 'px; margin-right:' + simpleGallery_navpanel.imageSpacing.spacing + 'px;'
            if(i > 0 && i < 6) {
                imgstyle += ' margin-bottom:3px'
            }
            var title = (i == 0 ? 'Prev' : (i == 6) ? 'Next' : (i <= totalimages) ? i + '' : '')
            if (title != '') {
                var imagesrc = (i == 0 ? simpleGallery_navpanel.images[0] : (i == 6) ? simpleGallery_navpanel.images[1] : (i == setting.curimage + 1) ? simpleGallery_navpanel.images[2] : simpleGallery_navpanel.images[3])
                   interfaceHTML += '<img id="navImage' + i + '" class="navimages" title="' + title + '" src="' + imagesrc + '" style="' + imgstyle + '" /> '
            }
        }
        //interfaceHTML+='<div class="gallerystatus" style="margin-top:1px">' + (setting.curimage+1) + '/' + setting.imagearray.length + '</div>'
        setting.$navpanel = $('<div class="navpanellayer"></div>')
            .css({ position: 'absolute', width: '100%', height: setting.panelheight, left: 0, top: setting.dimensions[1], font: simpleGallery_navpanel.panel.fontStyle, zIndex: '1001' })
            .appendTo(setting.$wrapperdiv)

        $('<div class="navpanelbg"></div><div class="navpanelfg"></div>') //create inner nav panel DIVs
            .css({ position: 'absolute', left: 0, top: 0, width: '100%', height: '100%' })
            .eq(0).css({ background: 'black', opacity: simpleGallery_navpanel.panel.opacity }).end() //"navpanelbg" div
            .eq(1).css({ paddingTop: simpleGallery_navpanel.panel.paddingTop, margin: '10px 0px 0px 5px', textAlign: 'left', color: 'white' }).html(interfaceHTML).end() //"navpanelfg" div
            .appendTo(setting.$navpanel)

        return setting.$navpanel.find('img.navimages').get() //return 4 nav related images and DIVs as DOM objects
    },

    getCookie: function(Name) {
        var re = new RegExp(Name + "=[^;]+", "i"); //construct RE to search for target name/value pair
        if (document.cookie.match(re)) //if cookie found
            return document.cookie.match(re)[0].split("=")[1] //return its value
        return null
    },

    setCookie: function(name, value) {
        document.cookie = name + "=" + value + ";path=/"
    }
}