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


def create_message(recipient, subject, template, **kwargs):
    app = current_app._get_current_object()
    sender = app.config['NOPAQUE_MAIL_SENDER']
    subject_prefix = app.config['NOPAQUE_MAIL_SUBJECT_PREFIX']
    msg = Message('{} {}'.format(subject_prefix, subject),
                  recipients=[recipient], sender=sender)
    msg.body = render_template('{}.txt.j2'.format(template), **kwargs)
    msg.html = render_template('{}.html.j2'.format(template), **kwargs)
    return msg


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


def send_async(msg):
    app = current_app._get_current_object()
    thread = Thread(target=send, args=(app, msg))
    thread.start()
    return thread