#!/bin/python3

"""
Prompt:
The script will accept a single command-line argument, which is intended to be a path to 
a directory. For the given directory, and each of the directories contained within it 
recursively, print the path to the directory and a list of the regular files in it.

Note the following requirements:
    - Within a directory, list files in descending numeric order by file size.
    - For each file, print the file name, size, and last modification timestamp.
    - Format the output clearly. (See below for one possible format.)
    - You may not use the ls program (or similar) at all in your solution.

Example output:
```
show-dirs-files gadgets
Directory <gadgets/blenders>
        5120   1982-03-02 03:14:00   whip
        4608   1982-02-02 03:14:00   frappe
        4096   1982-09-02 03:14:00   fluff
        3584   1982-08-02 03:14:00   cream
        3072   1982-01-02 03:14:00   beat
        2560   1982-07-02 03:14:00   combine
        2048   1982-06-02 03:14:00   blend
        1536   1982-05-02 03:14:00   mix
        1024   1982-04-02 03:14:00   stir
         512   1983-01-02 03:14:00   fold

Directory <gadgets/cars/chevy>
        2560   2010-09-07 08:15:00   avalanche
        2048   2010-10-07 08:19:00   malibu
        1536   2010-09-07 08:18:00   tahoe
        1024   2010-09-07 08:16:00   camaro
         512   2010-09-07 08:17:00   agile
         512   2010-09-07 08:19:00   prism

[...]
```
"""

import os
import sys
from datetime import datetime

def recursive_list(directory):
    if not os.path.isdir(directory):
        return
    elif directory[-1] == "/":
        directory = directory[:-1]

    contents = []
    for item in os.listdir(directory):
        path = f"{directory}/{item}"
        if os.path.isdir(path):
            recursive_list(path)
        else:
            # Print the file name, size, and last modification timestamp
            mdate = datetime.fromtimestamp(os.path.getmtime(path))
            fsize = os.path.getsize(path)
            contents.append((fsize, mdate, path))

    if contents:
        print(f"\nDirectory <{directory}>")
        for fsize, mdate, path in sorted(contents, key=lambda ctup: ctup[0], reverse=True):
            print(f"{fsize:>12}   {mdate}   {path}")

if __name__ == "__main__":
    recursive_list(*sys.argv[1:])