//** 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


var simpleGallery_navpanel={
    panel: {height:'45px', opacity:0.5, paddingTop:'5px', fontStyle:'bold 11px Verdana'}, //customize nav panel container
    images: [ '../image/left.gif', '../image/play.gif', '../image/right.gif', '../image/pause.gif'], //nav panel images (in that order)
    imageSpacing: {offsetTop:[-4, 0, -4], spacing:10}, //top offset of left, play, and right images, PLUS spacing between the 3 images
    slideduration: 500 //duration of slide up animation to reveal panel
}

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 preloadimages=[], longestdesc=null //preload images
    setting.longestdesc="" //get longest description of all slides. If no desciptions defined, variable contains ""
    for (var i=0; i<setting.imagearray.length; i++){
        preloadimages[i]=new Image()
        preloadimages[i].src=setting.imagearray[i][0]
        if (setting.imagearray[i][3] && setting.imagearray[i][3].length>setting.longestdesc.length)
            setting.longestdesc=setting.imagearray[i][3]
    }
    var slideshow=this
    jQuery(document).ready(function($){
        var setting=slideshow.setting
        setting.$wrapperdiv=$('#'+setting.wrapperid).css({position:'relative', visibility:'visible', background:'#FFFFFF', overflow:'hidden', width:setting.dimensions[0], height:setting.dimensions[1]}).empty() //main gallery DIV
        if (setting.$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
        if (setting.longestdesc!="") //if at least one slide contains a description (feature is enabled)
            setting.descdiv=simpleGallery.routines.adddescpanel(setting)
        $(setting.navbuttons).filter('img.navimages').css({opacity:0.8})
            .bind('mouseover mouseout', function(e){
                $(this).css({opacity:(e.type=="mouseover")? 1 : 0.8})
            })
            .bind('click', function(e){
                var keyword=e.target.title.toLowerCase()
                slideshow.navigate(keyword) //assign behavior to nav images
            })
        setting.$wrapperdiv.bind('mouseenter', function(){slideshow.showhidenavpanel('show')})
        setting.$wrapperdiv.bind('mouseleave', function(){slideshow.showhidenavpanel('hide')})
        slideshow.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
        })
    })
}

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))
        }
        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
        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]
        }
        else if (setting.longestdesc!=""){ //if at least one slide contains a description (feature is enabled)
            setting.descdiv.innerHTML=null
            setting.$descpanel.css({visibility:'hidden'})

        }
    },

    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)
        if (setting.longestdesc!="") //if at least one slide contains a description (feature is enabled)
            this.showhidedescpanel(state)
    },

    showhidedescpanel:function(state){
        var setting=this.setting
        var endpoint=(state=="show")? 0 : -setting.descpanelheight
        setting.$descpanel.stop().animate({top:endpoint}, simpleGallery_navpanel.slideduration)
    }
}

simpleGallery.routines={

    getSlideHTML:function(imgelement){
        var layerHTML=(imgelement[1])? '<a href="'+imgelement[1]+'" target="'+imgelement[2]+'">\n' : '' //hyperlink slide?
        layerHTML+='<img src="'+imgelement[0]+'" style="border-width:0" />'
        layerHTML+=(imgelement[1])? '</a>' : ''
        return layerHTML //return HTML for this layer
    },

    addnavpanel:function(setting){
        var interfaceHTML=''
        for (var i=0; i<3; i++){
            var imgstyle='position:relative; border:0; cursor:hand; cursor:pointer; top:'+simpleGallery_navpanel.imageSpacing.offsetTop[i]+'px; margin-right:'+(i!=2? simpleGallery_navpanel.imageSpacing.spacing+'px' : 0)
            var title=(i==0? 'Prev' : (i==1)? (setting.ispaused? 'Play' : 'Pause') : 'Next')
            var imagesrc=(i==1)? simpleGallery_navpanel.images[(setting.ispaused)? 1 : 3] : simpleGallery_navpanel.images[i]
            interfaceHTML+='<img 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)
        $('<div class="navpanelbg"></div><div class="navpanelfg"></div>') //create inner nav panel DIVs
            .css({position:'absolute', left:0, top:0, width:'100%', height:'100%'})
            .eq(0).css({background:'black', opacity:simpleGallery_navpanel.panel.opacity}).end() //"navpanelbg" div
            .eq(1).css({paddingTop:simpleGallery_navpanel.panel.paddingTop, textAlign:'center', color:'white'}).html(interfaceHTML).end() //"navpanelfg" div
            .appendTo(setting.$navpanel)
        return setting.$navpanel.find('img.navimages, div.gallerystatus').get() //return 4 nav related images and DIVs as DOM objects
    },

    adddescpanel:function(setting){
        setting.$descpanel=$('<div class="gallerydesc"><div class="gallerydescbg"></div><div class="gallerydescfg"><div class="gallerydesctext"></div></div></div>')
            .css({position:'absolute', width:'100%', left:0, top:-1000, zIndex:'1001'})
            .find('div').css({position:'absolute', left:0, top:0, width:'100%'})
            .eq(0).css({background:'black', opacity:simpleGallery_navpanel.panel.opacity}).end() //"gallerydescbg" div
            .eq(1).css({color:'white'}).end() //"gallerydescfg" div
            .eq(2).html(setting.longestdesc).end().end()
            .appendTo(setting.$wrapperdiv)
        var $gallerydesctext=setting.$descpanel.find('div.gallerydesctext')
        setting.descpanelheight=$gallerydesctext.outerHeight()
        setting.$descpanel.css({top:-setting.descpanelheight, height:setting.descpanelheight}).find('div').css({height:'100%'})
        return setting.$descpanel.find('div.gallerydesctext').get(0) //return gallery description DIV as a DOM object
    },

    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=/"
    }
}