#!/usr/bin/python

import nbt, sys

if len(sys.argv) == 2:
	nf = nbt.NBTFile(sys.argv[1],"rb")
	v = nf["Data"]["GameType"].value
	print "Current: " + ("Creative" if v else "Survival")
	nf["Data"]["GameType"].value = not v
	nf.write_file(sys.argv[1])
	print "Changed to: " + ("Creative" if not v else "Survival")
else:
	print "Error: incorrect amount of arguments supplied."
	print "Usage: ./change_map_type.py /path/to/level.dat"