function OnInit(initData) {
    initData.name = 'WatchFolderForCollection';
    initData.version = '2025-05-28';
    initData.url = 'https://resource.dopus.com/t/how-to-dynamically-update-a-file-collection-when-new-files-are-added-to-a-folder/55902';
    initData.desc = 'WatchFolderForCollection';
    initData.default_enable = true;
    initData.min_version = '13.0';
}

function OnAddCommands(addCmdData) {
    var cmd = addCmdData.AddCommand();
    cmd.name = 'WatchFolderForCollectionStart';
    cmd.method = 'OnWatchFolderForCollectionStart';
    cmd.desc = 'WatchFolderForCollectionStart';
    cmd.label = 'WatchFolderForCollectionStart';
    cmd.template = '';
    cmd.hide = false;
    cmd.icon = 'script';

    var cmd = addCmdData.AddCommand();
    cmd.name = 'WatchFolderForCollectionStop';
    cmd.method = 'OnWatchFolderForCollectionStop';
    cmd.desc = 'WatchFolderForCollectionStop';
    cmd.label = 'WatchFolderForCollectionStop';
    cmd.template = '';
    cmd.hide = false;
    cmd.icon = 'script';
}

var folderToWatch = 'D:\\test';
var targetCollection = 'coll://WatchedFolderCollection';

var itemID = 'FolderForCollection';
var fsu = DOpus.FSUtil();

if (!fsu.Exists(folderToWatch)) {
    var cmd = DOpus.Create().Command();
    cmd.RunCommand('CreateFolder NAME="' + folderToWatch + '"');
}

if (!fsu.Exists(targetCollection)) {
    var cmd = DOpus.Create().Command();
    cmd.RunCommand('CreateFolder NAME="' + targetCollection + '"');
}

function OnWatchFolderForCollectionStart(scriptCmdData) {
    fsu.WatchChanges(itemID, folderToWatch, 'f');
    var ssi = DOpus.Create().StringSetI(fsu.ReadDir(folderToWatch).Next(-1));
    Script.vars.Set('ssi', ssi);
    DOpus.vars.Set('WatchFolderForCollection', 'on');
}

function OnWatchFolderForCollectionStop(scriptCmdData) {
    fsu.CancelWatchChanges(itemID);
    DOpus.vars.Set('WatchFolderForCollection', 'off');
}

function OnFilesystemChange(FilesystemChangeData) {
    if (FilesystemChangeData.id != itemID) return;

    var ssi = Script.vars.Get('ssi');

    var cmd = DOpus.Create().Command();
    cmd.ClearFiles();

    var folderEnum = fsu.ReadDir(folderToWatch);
    while (!folderEnum.complete) {
        var folderItem = folderEnum.Next();
        if (ssi.insert(folderItem)) {
            cmd.AddFile(folderItem);
        }
    }
    folderEnum.Close();

    Script.vars.Set('ssi', ssi);

    cmd.SetDest(targetCollection);
    cmd.RunCommand('Copy COPYTOCOLL=member');
}