Write a Bash script that performs the following steps:

Takes the name of a file or directory as an argument. If no argument is provided, prompt the user to enter the name.

Determines whether the input is a file or a directory.

If it's a directory:

$3$a$.$ Check if the user has read and execute permissions on the directory. If not, display a warning message.

$3b.$ Count the number of files and subdirectories within it$.$

$3c.$ If the user has the necessary permissions, display the list of all files and subdirectories along with their respective sizes.

If it's a file:

$4$a$.$ Check if the user has read permission on the file. If not, display a warning message.

$4b.$ If the user has read permission, determine the word count, line count, and character count of the file. Based on the character count, categorize the file as follows:

$4c-1.$ "Text Heavy" if the character count is greater than $10,000.$

$4$c$-2.$ "Moderately Sized" if the character count is between $1,000$ and $10,000.$

$4c-3.$ "Light File" if the character count is less than $1,000.$