# -*- coding: utf-8 -*-
from __future__ import absolute_import

import subprocess
from email.mime.text import MIMEText
from email.utils import parseaddr

from . import Backend


class SendmailBackend(Backend):

    def send(self, recipient, subject, body, sender=None):
        if sender is None:
            sender = self.app.config['MAIL_DEFAULT_SENDER']

        safe = lambda s: s.split('\n', 1)[0]

        msg = MIMEText(body, _charset='utf-8')
        msg['Subject'] = safe(subject)
        msg['To'] = safe(recipient)
        msg['From'] = safe(sender)

        envelope = []
        _, address = parseaddr(safe(sender))
        if address != '':
            envelope = ['-f', address]

        p = subprocess.Popen([self.app.config['SENDMAIL_COMMAND']] +
                             envelope + ['-t'], stdin=subprocess.PIPE)
        p.stdin.write(msg.as_string())
        p.stdin.close()

        if p.wait() != 0:
            raise RuntimeError('sendmail terminated with %d' % p.returncode)