Need help with New Layers, Layer Names and resizing selected art

[CreativeONE21]

I'm in need to make a script for when a image is selected it will resize it then moves it to a new layer with a custom name, but also with an alert if the layer that it's moving to already exist so it won't create a duplicate Layer but only resize and move to the layer.

This is what I have but it has some issues. works with one object but multiple objects it won't do the one I select.

Please help, thanks,
Manuel I

// create a new layer 1/2 scale
var newLayer = app.activeDocument.layers.add();
newLayer.name = '1/2 scale';
newLayer.zOrder(ZOrderMethod.SENDTOBACK);

//Move selected object to new layer
var doc = app.activeDocument;
var layerName = '1/2 scale';
var _layer = doc.layers.getByName(layerName);
var _selectedItems = app.selection
for (var i = _selectedItems.length - 1; i >= 0; i--) {
_selectedItems[i].move(_layer, ElementPlacement.PLACEATEND);
_selectedItems[i].selected = false;
}
app.redraw();

//Resizes selection
var doc = app.activeDocument;
var item = doc.pathItems[0];
item.resize(
50.0, // x
50.0, // y
true, // changePositions
true, // changeFillPatterns
true, // changeFillGradients
true, // changeStrokePattern
true , // changeLineWidths
undefined); // scaleAbout