Rename all layers

Hi!

I've a problem to solve this issue.

I need to rename a lot of layers (near 1000).

I've found 2 scripts.

First select object in the document, I've little edit it to cycle selection and remove selection. Here the result:

// Adobe Illustrator CC Scripting
// Select and rename layers

var i, j, k, l;
if (app.documents.length > 0) {
  var doc = app.activeDocument;
  if (doc.selection.length == 0) {
  for (i = 0; i < doc.pageItems.length; i++) {
  //Select object
  doc.pageItems.selected = true;


  // HERE I NEED TO RENAME SELECTED LAYER, BEFORE "remove selection".
  //   ????


  //Remove selection
  doc.pageItems.selected = false;
  }
  }
}

Second script make me able to create var "pixelArea" of each object. I need to put that value at the end of each layer name.

I try to put that between in the red area, but give me loop, so Illustrator die.

if (app.documents.length > 0) {
  if (app.activeDocument.selection.length < 1) {
    alert('Select a path first');
  }
  else if (app.activeDocument.selection[0].area) {
    var objects =  app.activeDocument.selection;
  }
  else if (app.activeDocument.selection[0].pathItems) {
    var objects = app.activeDocument.selection[0].pathItems;
  }
  else { 
   alert('Please select a path or group.');
  }
  var pixelArea = 0;
  for (var i=0; i<objects.length; i++) {
  if (objects.area) {
  var pixelArea = pixelArea + objects.area;
  if (pixelArea < 0) var pixelArea = -pixelArea;
  // HERE WE HAVE pixelArea VAR. NEED TO ADD THIS VALUE AT THE END OF SELECTED LAYER NAME
  // SOMETHING LIKE THAT: layer.name = layer.name + "-" + pixelArea;
  }
  }
}

Both works (selection/remove selection and area calc, I don't find orking solution for layer name change), but when I combine them together generates the loop.

I'm new with Illustrator scripts, every help could be appreciate.

Really thanks!