# -*- coding: utf-8 -*-
# Copyright (c) 2018-2020 Christiaan Frans Rademan <chris@fwiw.co.za>.
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# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# THE POSSIBILITY OF SUCH DAMAGE.
from luxon import g
from luxon.utils.mail import SMTPClient


def sendmail(email, rcpt=None, subject=None, body=None, msg=None,
             fail_callback=None, success_callback=None):
    """Helper function to send an email.

    SMTP server settings are obtained from *settings.ini* file. E.g:

    .. code::

        [smtp]
        host = 127.0.0.1
        port = 587
        tls = False
        username = None
        password = None

    Args:
        email (str): Sender email address.
        rcpt (str): Recipient email address.
        subject (str): Email Subject.
        body (str): Email Body
        msg (obj): object of python email library's EmailMessage class.
        fail_callback (func): Function to call on send failure.
        success_callback (func): Function to call on send success.

    Returns:
        Bool: True if sending was successful, else False.

    """

    server = g.app.config.get('smtp', 'host', fallback='127.0.0.1')
    port = g.app.config.getint('smtp', 'port', fallback=587)
    tls = g.app.config.getboolean('smtp', 'tls', fallback=False)
    username = g.app.config.get('smtp', 'username', fallback=None)
    password = g.app.config.get('smtp', 'password', fallback=None)

    if username is not None and password is not None:
        auth = (username, password)
    else:
        auth = None

    with SMTPClient(email, server, port=port,
                    tls=tls, auth=auth) as server:
        if isinstance(rcpt, (list, tuple)):
            rcpt_list = rcpt
            for rcpt in rcpt_list:
                if server.send(rcpt, subject=subject, body=body, msg=msg):
                    if success_callback is not None:
                        success_callback(rcpt)
                else:
                    if fail_callback is not None:
                        fail_callback(rcpt)
        else:
            return server.send(rcpt, subject=subject, body=body, msg=msg)
