'''
NAME: Batch Image Renaming Tool (BIRT)
VERSION: 1.1.4
DESCRIPTION: Used to bulk rename files in a uniform, randomized way
AUTHOR: Justus Fee
CREATED: 16 April 2019
LAST UPDATED: 18 May 2021
TODO: Multithread
'''

import os
import time
import uuid

'''
Generates a unique hex ID.
'''
def generate_filename():
	return uuid.uuid4().hex;

'''
Counts the number of files that are going to be modified. For use with progress display.
'''
def count_files(folder):
	count = 0
	for (root, dirs, files) in os.walk(folder, topdown=True):
		for pic in files:
			count += 1
	return count

'''
Where the magic happens.
'''
def main():
	print("---[ Welcome to Justus' Batch Image Renaming Tool (BIRT). ]---")
	folder = input("Please enter directory path: \n>")
	while not os.path.isdir(folder):
		print("[!] Invalid directory. Try again.")
		folder = input("Please enter directory path: \n>")

	print("Validating directory...")
	total = count_files(folder)

	user_choice = input("Directory validated. Run script? (Y/N)\n>")
	if user_choice.lower() == "y":
		print("")
		pic_count = 0
		start_time = time.time()

		for (root, dirs, files) in os.walk(folder, topdown=True):
			for pic in files:
				# Get file extension
				extension = os.path.splitext(pic)[1]

				# Generate new filename
				new_filename = generate_filename() + extension

				# Rename file
				os.rename(os.path.join(root, pic), os.path.join(root, new_filename))

				# Update status
				print("[{:.2%}] Processing file {:,} / {:,}".format(((pic_count+1) / total), pic_count+1, total), end="\r")
				pic_count += 1

		print("\n\nJob's done!")
		print("{:<20} {:,}".format("Files processed:", pic_count))
		print("{:<20} {:.2} minutes".format("Time elapsed:", (time.time() - start_time) / 60))
	else:
		print("Script aborted. Have a nice day.")

	input("\nPlease press ENTER to quit.")

'''
Typical Python stuff.
'''
if __name__ == "__main__":
	main()