How to resize an image layer to the same size as the width of the document respecting its aspect ratio.

how resize image layer same size width of document respecting aspect ratio.

#target photoshop; if(documents.length){ var doc = app.activedocument; var layer = doc.activelayer; var per = doc.width.value/(layer.bounds[2]-layer.bounds[0])*100; layer.resize(per,per); doc.selection.selectall(); align('adch'); align('adcv' ); doc.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 ) ); executeaction( charidtotypeid( "algn" ), desc, dialogmodes.no );  };  

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