/* Translucent slideshow
* Created: Jan 12th, 2011 by DynamicDrive.com. This notice must stay intact for usage 
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code
*/

jQuery.noConflict()

function translideshow(options) {
    var $ = jQuery
    this.setting = { displaymode: { type: 'auto', pause: 2000, cycles: 2, pauseonmouseover: true }, orientation: 'h', persist: true, slideduration: 500} //default settings
    jQuery.extend(this.setting, options) //merge default settings with options
    var curslide = (this.setting.persist) ? translideshow.routines.getCookie("slider-" + this.setting.wrapperid) : 0
    this.curslide = (curslide == null || curslide > this.setting.imagearray.length - 1) ? 0 : parseInt(curslide) //make sure curslide index is within bounds
    this.curstep = 0
    this.zIndex = 1
    this.animation_isrunning = false //variable to indicate whether an image is currently being slided in
    this.posprop = (this.setting.orientation == "h") ? "left" : "top"
    options = null
    var slideshow = this, setting = this.setting, preloadimages = [], slidesHTML = ''
    for (var i = 0; i < setting.imagearray.length; i++) { //preload images
        preloadimages[i] = new Image()
        preloadimages[i].src = setting.imagearray[i][0]
        slidesHTML += translideshow.routines.getSlideHTML(setting.imagearray[i], setting.dimensions[0] + 'px', setting.dimensions[1] + 'px', this.posprop) + '\n'
    }
    jQuery(function ($) { //on document.ready
        slideshow.init($, slidesHTML)
    })
    $(window).bind('unload', function () { //on window onload
        if (slideshow.setting.persist) //remember last shown slide's index?
            translideshow.routines.setCookie("slider-" + setting.wrapperid, slideshow.curslide)
    })
}

translideshow.prototype = {

    slide: function (nextslide, dir) { //possible values for dir: "left", "right", "top", or "down"
        if (this.curslide == nextslide)
            return
        var slider = this
        var nextslide_initialpos = this.setting.dimensions[(dir == "right" || dir == "left") ? 0 : 1] * ((dir == "right" || dir == "down") ? -1 : 1)
        var curslide_finalpos = -nextslide_initialpos
        var posprop = this.posprop
        if (this.animation_isrunning != null)
            this.animation_isrunning = true //indicate animation is running
        //this.$imageslides.eq(dir=="left"||dir=="top"? nextslide : this.curslide).css("zIndex", ++this.zIndex) //increase zIndex of upcoming slide so it overlaps outgoing
        this.$imageslides.eq(nextslide).css(translideshow.routines.createobj(['visibility', 'visible'], ['zIndex', ++this.zIndex], ['opacity', 0.3], [posprop, nextslide_initialpos])) //show upcoming slide
			.animate(translideshow.routines.createobj([posprop, 0]), this.setting.slideduration, function () {
			    jQuery(this).css('opacity', 1)
			    slider.animation_isrunning = false
			})
        //this.$imageslides.eq(this.curslide).animate(translideshow.routines.createobj([posprop, curslide_finalpos]), this.setting.slideduration, function(){jQuery(this).css("visibility", "hidden")}) //hide outgoing slide
        this.curslide = nextslide
    },

    navigate: function (keyword) { //keyword: "back" or "forth", or "integer"
        clearTimeout(this.rotatetimer)
        var dir = (keyword == "back" || parseInt(keyword) < this.curslide) ? (this.setting.orientation == "h" ? "right" : "down") : (this.setting.orientation == "h" ? "left" : "up")
        var targetslide = (keyword == "back") ? this.curslide - 1 : (keyword == "forth") ? this.curslide + 1 : parseInt(keyword)
        targetslide = (targetslide < 0) ? this.$imageslides.length - 1 : (targetslide > this.$imageslides.length - 1) ? 0 : targetslide //wrap around
        if (this.animation_isrunning == false)
            this.slide(targetslide, dir)
    },

    rotate: function () {
        var slideshow = this
        if (this.ismouseover) { //pause slideshow onmouseover
            this.rotatetimer = setTimeout(function () { slideshow.rotate() }, this.setting.displaymode.pause)
            return
        }
        var nextslide = (this.curslide < this.$imageslides.length - 1) ? this.curslide + 1 : 0
        this.slide(nextslide, this.posprop) //go to next slide, either to the left or upwards depending on setting.orientation setting
        if (this.setting.displaymode.cycles == 0 || this.curstep < this.maxsteps - 1) {
            this.rotatetimer = setTimeout(function () { slideshow.rotate() }, this.setting.displaymode.pause)
            this.curstep++
        }
    },

    init: function ($, slidesHTML) {
        var slideshow = this, setting = this.setting
        this.$wrapperdiv = $('#' + setting.wrapperid).css({ position: 'relative', visibility: 'visible', overflow: 'hidden', width: setting.dimensions[0], height: setting.dimensions[1] }) //main DIV
        if (this.$wrapperdiv.length == 0) { //if no wrapper DIV found
            alert("Error: DIV with ID \"" + setting.wrapperid + "\" not found on page.")
            return
        }
        this.$wrapperdiv.html(slidesHTML)
        this.$imageslides = this.$wrapperdiv.find('div.slide')
        this.$imageslides.eq(this.curslide).css(translideshow.routines.createobj([this.posprop, 0])) //set current slide's CSS position (either "left" or "top") to 0
        if (this.setting.displaymode.type == "auto") { //auto slide mode?
            this.setting.displaymode.pause += this.setting.slideduration
            this.maxsteps = this.setting.displaymode.cycles * this.$imageslides.length
            if (this.setting.displaymode.pauseonmouseover) {
                this.$wrapperdiv.mouseenter(function () { slideshow.ismouseover = true })
                this.$wrapperdiv.mouseleave(function () { slideshow.ismouseover = false })
            }
            this.rotatetimer = setTimeout(function () { slideshow.rotate() }, this.setting.displaymode.pause)
        }
    }

}

translideshow.routines = {

    getSlideHTML: function (imgref, w, h, posprop) {
        var posstr = posprop + ":" + ((posprop == "left") ? w : h)
        var layerHTML = (imgref[1]) ? '<a href="' + imgref[1] + '" target="' + imgref[2] + '">' : '' //hyperlink slide?
        layerHTML += '<img src="' + imgref[0] + '" style="border-width:0;" />'
        layerHTML += (imgref[1]) ? '</a>' : ''
        return '<div class="slide" style="position:absolute;' + posstr + ';width:' + w + ';height:' + h + ';text-align:center;">'
			+ '<div style="width:' + w + ';height:' + h + ';display:table-cell;vertical-align:middle;">'
			+ layerHTML
			+ '</div></div>' //return HTML for this layer
    },


    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=/"
    },

    createobj: function () {
        var obj = {}
        for (var i = 0; i < arguments.length; i++) {
            obj[arguments[i][0]] = arguments[i][1]
        }
        return obj
    }
}