var siteComposerFlickSets = [];

function SiteComposerFlickSet(id, imageUrlList, positionsCount) {
    this.id = id;
    this.imageUrlList = imageUrlList;
    this.positionsCount = positionsCount;
    this.positionsUsage = [];

    for(var i = 0; i < positionsCount; i++) {
        this.positionsUsage[i] = i;
    }
}

function SiteComposerRandomNumber(from, to) {

    return (Math.round((to - from) * Math.random()) + from);
}

function SiteComposerChangeImage(flickSet, positionNumber, imageNumber) {

    document.getElementById("SiteComposerFlickSetImage_" + flickSet.id + "_" + positionNumber).src = flickSet.imageUrlList[imageNumber];
    flickSet.positionsUsage[positionNumber] = imageNumber;
}

function SiteComposerRandomImage(flickSet, positionNumber) {

    // select random image
    var newImageNumber = SiteComposerRandomNumber(0, flickSet.imageUrlList.length - 1);

    for (var i = 0; i < flickSet.positionsCount; i++) {

        if (newImageNumber == flickSet.positionsUsage[i]) {

            // image used in some position, cancel this change
            return;
        }
    }

    // place image to random position
    SiteComposerChangeImage(flickSet, positionNumber, newImageNumber);
}

function SiteComposerChangeOneImage(flickSet) {

    SiteComposerRandomImage(flickSet, SiteComposerRandomNumber(0, flickSet.positionsCount - 1));
}


/*    ShiftAll(); */
/*    window.setInterval("ShiftAll();", 5000);   */