#!/usr/bin/env python
import sys, re
from subprocess import check_output

commit_msg_filepath = sys.argv[1]
try:
		branch = check_output(['git', 'symbolic-ref', '--short', 'HEAD'])
		branch = branch.strip().decode("utf-8")
		print('COMMITING INTO BRANCH -> ', branch)
		# Add your Regexp Here
		regex = '(feature|hotfix|bug)\/([A-Za-z]+-[0-9]+)'
		if re.match(regex, branch):
				issue = re.match(regex, branch).group(2)
				print('JIRA ISSUE REFERENCE -> ', issue)
				with open(commit_msg_filepath, 'r+') as fh:
						fh.seek(0, 0)
						commit_msg = fh.read()
						print('COMMIT MSG -> ', commit_msg)
						fh.close()
				with open(commit_msg_filepath, 'w') as fh:
						fh.write('[%s] %s' % (issue, commit_msg))
		elif branch != 'master' and branch != 'dev':
				print('Incorrect branch name')
				print('Using default msg')
				fh.close()
except Exception as err:
		# we are in a rebase or detached head state
		with open(commit_msg_filepath, 'r') as fh:
				fh.seek(0, 0)
				commit_msg = fh.read()
				print('ERROR FOUND, USING DEFAULT COMMIT MSG -> ', commit_msg)
				fh.close()
		with open(commit_msg_filepath, 'w') as fh:
				fh.write('%s' % (commit_msg))