#!/usr/bin/env python3

import sys
import os
import os.path
import traceback
import hashlib
import subprocess
from shutil import which



def is_tool(name):
	return which(name) is not None



def get_script_folder():
	return os.path.dirname(os.path.realpath(sys.argv[0]))



def read_all_text_from_file(path):
	print("Reading {}".format(path))
	file = open(path, 'r')
	text = file.read()
	file.close()
	return text



def main():
	hpp_path = os.path.join(get_script_folder(), '..', 'toml.hpp')
	hash1 = hashlib.sha1(read_all_text_from_file(hpp_path).encode('utf-8')).hexdigest()
	print("Hash 1: {}".format(hash1))
	subprocess.check_call(
		['py' if is_tool('py') else 'python3', 'generate_single_header.py']
	)
	hash2 = hashlib.sha1(read_all_text_from_file(hpp_path).encode('utf-8')).hexdigest()
	print("Hash 2: {}".format(hash2))
	if (hash1 != hash2):
		print(
			"toml.hpp wasn't up-to-date!\nRun generate_single_header.py before your commit to prevent this error.",
			file=sys.stderr
		)
		return 1
	print("toml.hpp was up-to-date")
	return 0



if __name__ == '__main__':
	try:
		sys.exit(main())
	except Exception as err:
		print(
			'Fatal error: [{}] {}'.format(
				type(err).__name__,
				str(err)
			),
			file=sys.stderr
		)
		traceback.print_exc(file=sys.stderr)
		sys.exit(-1)