# -*- coding: utf-8 -*-

# Copyright (c) 2013-2018, Camptocamp SA
# All rights reserved.

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# modification, are permitted provided that the following conditions are met:

# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
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#    this list of conditions and the following disclaimer in the documentation
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import logging
import smtplib
from typing import Dict, Any, List, cast
from socket import gaierror
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.utils import formatdate
from pyramid.httpexceptions import HTTPInternalServerError


LOG = logging.getLogger(__name__)


def send_email_config(
    settings: Dict[str, Any],
    email_config_name: str,
    email: str, **kwargs: Dict[str, Any]
) -> None:  # pragma: no cover
    smtp_config = settings['smtp']
    email_config = cast(Dict[str, str], settings[email_config_name])

    try:
        send_email(
            email_config['email_from'], [email],
            email_config['email_body'].format(**kwargs),
            email_config['email_subject'],
            smtp_config,
        )
    except gaierror:
        LOG.error('Unable to send the email.', exc_info=True)
        raise HTTPInternalServerError('See server logs for details')


def send_email(
    from_addr: str, to_addrs: List[str], body: str, subject: str,
    smtp_config: Dict[str, str]
) -> None:  # pragma: no cover
    msg = MIMEMultipart()
    msg['From'] = from_addr
    msg['To'] = ', '.join(to_addrs)
    msg['Date'] = formatdate(localtime=True)
    msg['Subject'] = subject
    msg.attach(MIMEText(body, 'plain', 'utf-8'))

    # Connect to server
    if smtp_config.get('ssl', False):
        smtp = smtplib.SMTP_SSL(smtp_config['host'])  # type: smtplib.SMTP
    else:
        smtp = smtplib.SMTP(smtp_config['host'])
    if smtp_config.get('user', False):
        smtp.login(smtp_config['user'], smtp_config['password'])
    if smtp_config.get('starttls', False):
        smtp.starttls()

    smtp.sendmail(from_addr, to_addrs, msg.as_string())
    smtp.close()
