#!/usr/bin/env python
#-*-coding:utf-8-*-

import subprocess
import sys
reload(sys)
sys.setdefaultencoding('utf8')
import re

commit_message_format = '{issue_id} {user_message}'

project_format = '[A-Z][A-Z]+'

issue_pattern = '{}-[\d]+'.format(project_format)
def read_current_message():
    with open(sys.argv[1], 'r') as f:
        return f.read()


def write_message(message):
    with open(sys.argv[1], 'w') as f:
        f.write(message)


def contains_message(message):
    return message and not message.isspace()


def remove_editor_help_message(message):
    return message[:message.find("# Please enter the commit message for your changes.")].rstrip()


def read_branch_or_exit():
    try:
        current_ref = subprocess.check_output('git symbolic-ref HEAD', shell=True).decode()
        return current_ref[len('refs/heads/'):]
    except subprocess.CalledProcessError:
        print("add-issue-id-hook: Adding issue id failed. Are you in detached HEAD state?")
        sys.exit()


issue_id_match = re.search(issue_pattern, read_branch_or_exit())
if issue_id_match:
    found_issue_id = issue_id_match.group()
    print found_issue_id
    user_message = remove_editor_help_message(read_current_message())

    if contains_message(user_message) and found_issue_id not in user_message:
        write_message(commit_message_format.format(issue_id='Feat '+found_issue_id, user_message=user_message+'\r\n\r\n'+'Resolves '+ found_issue_id))