#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# SàT: a jabber client
# Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""email sending facilities"""

from __future__ import absolute_import
from sat.core.constants import Const as C
from sat.core.log import getLogger
log = getLogger(__name__)
from twisted.mail import smtp
from email.mime.text import MIMEText



def sendEmail(host, to_emails, subject=u'', body=u'', from_email=None):
    """send an email using SàT configuration

    @param to_emails(list[unicode], unicode): list of recipients
        if unicode, it will be split to get emails
    @param subject(unicode): subject of the message
    @param body(unicode): body of the message
    @param from_email(unicode): address of the sender
    @return (D): same as smtp.sendmail
    """
    if isinstance(to_emails, basestring):
        to_emails = to_emails.split()
    email_host = host.memory.getConfig(None, u'email_server') or u'localhost'
    email_from = host.memory.getConfig(None, u'email_from')
    if email_from is None:
        # we suppose that email domain and XMPP domain are identical
        domain = host.memory.getConfig(None, u'xmpp_domain', u'example.net')
        email_from = u'no_reply@' + domain
    email_sender_domain = host.memory.getConfig(None, u'email_sender_domain')
    email_port = int(host.memory.getConfig(None, u'email_port', 25))
    email_username = host.memory.getConfig(None, u'email_username')
    email_password = host.memory.getConfig(None, u'email_password')
    email_auth = C.bool(host.memory.getConfig(None, 'email_auth', False))
    email_starttls = C.bool(host.memory.getConfig(None, 'email_starttls', False))

    msg = MIMEText(body, 'plain', 'UTF-8')
    msg[u'Subject'] = subject
    msg[u'From'] = email_from
    msg[u'To'] = u", ".join(to_emails)

    return smtp.sendmail(email_host.encode("utf-8"),
                         email_from.encode("utf-8"),
                         [email.encode("utf-8") for email in to_emails],
                         msg.as_string(),
                         senderDomainName = email_sender_domain.encode("utf-8") if email_sender_domain else None,
                         port = email_port,
                         username = email_username.encode("utf-8") if email_username else None,
                         password = email_password.encode("utf-8") if email_password else None,
                         requireAuthentication = email_auth,
                         requireTransportSecurity = email_starttls)