from threading import Thread
from flask import current_app, render_template
from flask_mail import Message
from . import mail


def send_async_email(app, msg):
    with app.app_context():
        mail.send(msg)


def send_email(to, subject, template, **kwargs):
    msg = Message('[Opaque] {}'.format(subject), recipients=[to])
    msg.body = render_template(template + '.txt.j2', **kwargs)
    msg.html = render_template(template + '.html.j2', **kwargs)
    thread = Thread(target=send_async_email,
                    args=(current_app._get_current_object(), msg))
    thread.start()
    return thread