import secrets

import discord

import config
import aiosmtplib as smtp
from email.message import EmailMessage

gmail_cfg = {"addr": "smtp.gmail.com", "username": config.email, "password": config.email_password, "port": 465}


async def send_verification_code(user: discord.User, student_number: str, **kwargs) -> str:
    """Sends a verification code, returning said verification code, to the student."""
    code = secrets.token_hex(16)
    text = (
        f"Hey {user} ({student_number})! The code to join the hi^5 code is '{code}' - use "
        f"'/verify {code}' in the bot's DMs to continue \N{dancer}\n\n~nex"
    )
    msg = EmailMessage()
    msg["From"] = gmail_cfg["username"]
    msg["To"] = f"{student_number}@my.leedscitycollege.ac.uk"
    msg["Bcc"] = gmail_cfg["username"]
    msg["Subject"] = "Server Verification"
    msg.set_content(text)

    kwargs.setdefault("hostname", gmail_cfg["addr"])
    kwargs.setdefault("port", gmail_cfg["port"])
    kwargs.setdefault("use_tls", True)
    kwargs.setdefault("username", gmail_cfg["username"])
    kwargs.setdefault("password", gmail_cfg["password"])
    kwargs.setdefault("start_tls", not kwargs["use_tls"])

    assert kwargs["start_tls"] != kwargs["use_tls"]

    await smtp.send(msg, **kwargs)
    return code