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):
    """
    # Testing w/in Flask shell
    flask shell
    from app import send_email
    send_email(app.config["MAIL_USERNAME"], "test", "mail/test")
    """
    app = current_app._get_current_object()
    msg = Message(subject, sender=app.config['MAIL_USERNAME'], recipients=[to])
    msg.body = render_template(template + '.txt', **kwargs)
    msg.html = render_template(template + '.html', **kwargs)
    thr = Thread(target=send_async_email,args=[app, msg])
    thr.start()
    return thr
