#!/bin/python
import tarfile
import argparse

if __name__ == "__main__":
	parser = argparse.ArgumentParser("KissSplitDataset")
	parser.add_argument('--data', '-d', required=True, help="Data input tar file")
	parser.add_argument('--out', '-o', required=True, help="output file")
	parser.add_argument('--extract_cells', '-e', required=True, help="The cells to extract from the input")
	parser.add_argument('--create_inverse', '-i', action="store_true", help="The cells to extract from the input")
	args = parser.parse_args()

	cells = list[int]()
	tokens = args.extract_cells.split(',')
	for token in tokens:
		cells.append(int(token))
		print("will extract cell " + token)

	with tarfile.open(args.out, mode="w") as outfile:
		with tarfile.open(args.data, mode="r") as tar:
			if args.create_inverse:
				inverseoutfile = tarfile.open("inverse_" + args.out, mode="w")
			for file_info in tar:
				if file_info.isfile():
					tokens = file_info.name.split("-")
					if len(tokens) != 3:
						print("Could not parse filename " + file_info.name)
						continue
					if int(tokens[1]) in cells:
						print("Adding " + file_info.name)
						outfile.addfile(file_info, tar.extractfile(file_info))
					elif args.create_inverse:
						print("Inverse " + file_info.name)
						inverseoutfile.addfile(file_info, tar.extractfile(file_info))
			if args.create_inverse:
				inverseoutfile.close()