# coding=utf-8
""" Create iso-2022-jp email message """

import json
from email.mime.text import MIMEText
from email.utils import formatdate, formataddr, parseaddr
from email.header import Header

COMMASPACE = ', '

def encode_name_part(name_and_addr):
    """ encode name part with iso-2022-jp """
    name, addr = parseaddr(name_and_addr)
    return formataddr((str(Header(name.encode('iso-2022-jp'), 'iso-2022-jp')), addr))

def create_message(email):
    """ create message to send iso-2022-jp email """
    msg = MIMEText(email["Body"].encode('iso-2022-jp'), 'plain', 'iso-2022-jp')
    msg['Date'] = formatdate()
    msg['Subject'] = Header(email["Subject"].encode('iso-2022-jp'), 'iso-2022-jp')
    msg['From'] = encode_name_part(email["From"])

    for item in ["To", "Cc", "Bcc"]:
        if email.has_key(item) and len(email[item]) != 0:
            msg[item] = COMMASPACE.join(map(encode_name_part, email[item]))

    return msg

if __name__ == "__main__":
    JSON_STRING = r'''
{
  "From": "わたし <me@example.jp>",
  "Subject": "さぶじぇくと",
  "To": [
    "なまえ <user@example.jp>"
  ],
  "Cc": [
  ],
  "Bcc": [
  ],
  "Body": "本文です。\n文字化けしていませんか？"
}
'''
    def print_message():
        """ print test message """
        params = json.loads(JSON_STRING)
        print create_message(params)

    print_message()