#!/usr/bin/env python
#
# Create a template file that I can write my initial message for doing a
# batch send of git-send-email
#
# Copyright (C) 2008 Red Hat, Inc.
# Author: David Cantrell <dcantrell@redhat.com>
# License: GPLv2+
#

import math
import os
import string
import sys
import time

def getTimeZoneOffset():
    if time.daylight:
        offset = time.altzone
    else:
        offset = time.timezone

    if offset == '0':
        return '-0000'

    absoffset = abs(offset)
    hours = int(math.floor(absoffset / 3600.0))
    mins = int(math.floor((absoffset - (hours * 3600)) / 60.0))

    if offset > 0:
       direction = '-'
    else:
       direction = '+'

    return "%s%s%s" % (direction, string.zfill(hours, 2), string.zfill(mins, 2))

if __name__ == "__main__":
    pid = os.popen('git-config user.name')
    name = pid.read().strip()
    pid.close()

    pid = os.popen('git-config user.email')
    email = pid.read().strip()
    pid.close()

    if name == '' or name is None:
        print "ERROR: Missing user.name in .gitconfig"
        sys.exit(1)

    if email == '' or email is None:
        print "ERROR: Missing user.email in .gitconfig"
        sys.exit(1)

    if os.path.exists('_msg'):
        answered = False
        while not answered:
            ans = raw_input('_msg file exists, overwrite? (Y/N) ').strip().lower()
            if ans == 'n' or ans == 'y':
                answered = True
            else:
                print "ERROR: You must answer Y or N."

        if ans == 'n':
            sys.exit(0)

    zone = getTimeZoneOffset()
    now = "%s %s" % (time.strftime('%a, %d %b %Y %H:%M:%S'), zone,)

    out = open('_msg', 'w')
    out.write('From %s %s\n' % (email, now,))
    out.write('From: %s <%s>\n' % (name, email,))
    out.write('Date: %s\n' % (now,))
    out.write('Subject: WRITEME\n\n')
    out.write('WRITEME\n\n')

    if os.path.isfile(os.environ.get('HOME') + '/.signature'):
        out.write('-- \n')

        sig = open(os.environ.get('HOME') + '/.signature', 'r')
        lines = sig.readlines()
        sig.close()

        for line in lines:
            out.write(line)

    out.close()