Help with the size of the photo on the canvas

Kukurykus​ I used only these lines of the script JJMack

var SWidth  = app.activeDocument.width.as('px');    
var SHeight = app.activeDocument.height.as('px');    
var bounds = app.activeDocument.activeLayer.bounds;    
var LWidth = bounds[2].as('px')-bounds[0].as('px');    
var LHeight = bounds[3].as('px')-bounds[1].as('px');   
  
  
var userResampleMethod = app.preferences.interpolation;  // Save interpolation settings    
app.preferences.interpolation = ResampleMethod.BICUBIC; // resample interpolation bicubic    
if (LWidth/LHeight<SWidth/SHeight) { // Smart Object layer Aspect Ratio less the Canvas area Aspect Ratio     
   var percentageChange = ((SWidth/LWidth)*100);  // Resize to canvas area width    
   activeDocument.activeLayer.resize(percentageChange,percentageChange,AnchorPosition.MIDDLECENTER);    
   }    
else {     
  var percentageChange = ((SHeight/LHeight)*100); // resize to canvas area height    
  activeDocument.activeLayer.resize(percentageChange,percentageChange,AnchorPosition.MIDDLECENTER);    
   }    
app.preferences.interpolation = userResampleMethod; // Reset interpolation setting    
  
  
app.activeDocument.selection.selectAll();  
align('AdCH'); align('AdCV');  
app.activeDocument.selection.deselect();  
function align(method) {  
  var desc = new ActionDescriptor();  
  var ref = new ActionReference();  
  ref.putEnumerated( charIDToTypeID( "Lyr " ), charIDToTypeID( "Ordn" ), charIDToTypeID( "Trgt" ) );  
  desc.putReference( charIDToTypeID( "null" ), ref );  
  desc.putEnumerated( charIDToTypeID( "Usng" ), charIDToTypeID( "ADSt" ), charIDToTypeID( method ) );  
  try{  
  executeAction( charIDToTypeID( "Algn" ), desc, DialogModes.NO );  
  }catch(e){}  
}