from typing import List
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from contextlib import contextmanager
from compendium_v2.db.auth_model import User
from compendium_v2.email import send_admin_signup_notification, send_user_signup_notification


class MockedThread(object):
    def __init__(self, target, args):
        self.target = target
        self.args = args

    def start(self):
        self.target(*self.args)


def decode_message(msg: MIMEMultipart):
    message: List[MIMEText] = msg.get_payload()
    text: MIMEText = message[0]
    decoded = text.get_payload(decode=True).decode('utf-8')
    return decoded


@contextmanager
def test_user(app):
    with app.app_context():
        app.config['MAIL_ENABLE'] = True
        app.config['MAIL_SERVER'] = 'localhost'
        app.config['MAIL_PORT'] = 54655
        app.config['MAIL_SENDER_EMAIL'] = 'fakesender123@test.local'
        app.config['MAIL_EXCLUDED_ADMINS'] = []
        user = User(fullname='testname', email='testmail321@email.com', oidc_sub='testsub')
        yield user


def test_signup_email_admin(app, mocked_admin_user, mocker):

    def _send_mail(*args, **kwargs):
        _msg = args[-1]
        decoded = decode_message(_msg)
        _from = _msg['From']
        _to = _msg['To']
        assert _from == 'fakesender123@test.local'
        assert _to == 'testemail123@email.local'
        message = 'testname has just signed up with the email testmail321@email.com and provider ID testsub'
        assert decoded == message

    mocker.patch('compendium_v2.email._send_mail', _send_mail)
    mocker.patch('threading.Thread', MockedThread)
    with test_user(app) as user:
        send_admin_signup_notification(user)


def test_signup_email_user(app, mocker):

    def _send_mail(*args, **kwargs):
        _msg = args[-1]
        _from = _msg['From']
        _to = _msg['To']
        assert _from == 'fakesender123@test.local'
        assert _to == 'testmail321@email.com'
        decoded = decode_message(_msg)
        assert len(decoded) > 50  # check that there's a message

    mocker.patch('compendium_v2.email._send_mail', _send_mail)
    mocker.patch('threading.Thread', MockedThread)
    with test_user(app) as user:
        send_user_signup_notification(user, 'testname')