"""Send e-mail."""

import smtplib
from email.message import EmailMessage
from email.utils import formatdate, make_msgid

import flask


def send_mail(config: flask.config.Config, subject: str, body: str) -> None:
    """Send an e-mail."""
    msg = EmailMessage()

    msg["Subject"] = subject
    msg["To"] = f"{config['NAME']} <{config['MAIL_TO']}>"
    msg["From"] = f"{config['NAME']} <{config['MAIL_FROM']}>"
    msg["Date"] = formatdate()
    msg["Message-ID"] = make_msgid()

    # Add extra mail headers
    for header, value in config["MAIL_HEADERS"]:
        msg[header] = value

    msg.set_content(body)

    s = smtplib.SMTP(config["SMTP_HOST"])
    s.sendmail(config["MAIL_TO"], [config["MAIL_TO"]], msg.as_string())
    s.quit()