# Script Name   : random_file_move.py
# Author(s)     : Akash Jain
# Created       : 1 September 2020
# Last Modified : 1 September 2020
# Version       : 1.0
# Description   : This will move specified number of files(given in ratio) from the src directory to dest directory.


import os, random
import argparse

def check_ratio(x):
	try:
		x = float(x)
	except ValueError:
		raise argparse.ArgumentTypeError("%r not a floating-point literal" % (x,))

	if (x < 0.0 or x > 1.0):
		raise argparse.ArgumentTypeError("%r not in range [0.0, 1.0]" % (x))
	return x

desc = 'Script to move specified number of files(given in ratio) from the src directory to dest directory.'
usage = 'python random_file_move.py -src [SRC] -dest [DEST] -ratio [RATIO]'

parser = argparse.ArgumentParser(usage = usage, description = desc)
parser.add_argument('-src', '--src', type = str, required = True, 
	help = '(REQUIRED) Path to directory from which we cut files. Space not allowed in path.')
parser.add_argument('-dest', '--dest', type = str, required = True, 
	help = '(REQUIRED) Path to directory to which we move files. Space not allowed in path.')
parser.add_argument('-ratio', '--ratio', type = check_ratio, required = True, 
	help = "(REQUIRED) Ratio of files in 'src' and 'dest' directory.")

args = parser.parse_args()

src = args.src
dest = args.dest
ratio = args.ratio

files = os.listdir(src)
size = int(ratio * len(files))

print('Move {} files from {} to {} ? [y/n]'.format(size, src, dest))
if input().lower() == 'y':
	for f in random.sample(files, size):
		try:
		    os.rename(os.path.join(src, f), os.path.join(dest, f))
		except Exception as e:
			print(e)
	print('Successful')
else:
	print('Cancelled')