command line - Script to swap the names of two files

I am new to Bash scripting. I have been trying to make a script that will swap the file names of the two files passed to it by the user.

Here's a picture of the two versions of my script so far

Here is the script in text format with mv:

#! /bin/bash
file1=$file1

file2=$file2

echo "write file name :"
read file1 file2

if [[ $file1 = $file2 ]]
then 
  cp $file1 $file1
  mv $file1 $file2 
fi


if [[ $file2 = $file1 ]]
then   
  mv $file2 $file1
fi

But my question is if I can make a script that let the user write down 2 filenames first, then the script will swap the 2 file names

The basic of swapping file names what I have read is this

cp $file1 temporaryfile
mv $file1 $file2
mv $file2 temporyfile