"""SMTP email sending for bincio-auth.

Config is set by the CLI before uvicorn starts (same pattern as deps.py).
"""

from __future__ import annotations

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

# ── Config (set by CLI) ───────────────────────────────────────────────────────

host: str = ""
port: int = 587
user: str = ""
password: str = ""
sender: str = ""   # "From" address; defaults to user


def configured() -> bool:
    return bool(host and user and password)


def send_reset_email(to_email: str, handle: str, reset_url: str) -> None:
    if not configured():
        raise RuntimeError("SMTP not configured")

    from_addr = sender or user
    msg = MIMEMultipart("alternative")
    msg["Subject"] = "Reset your Bincio password"
    msg["From"] = f"Bincio <{from_addr}>"
    msg["To"] = to_email

    body = (
        f"Hi @{handle},\n\n"
        f"Someone requested a password reset for your Bincio account.\n"
        f"Click the link below to set a new password — it expires in 1 hour:\n\n"
        f"  {reset_url}\n\n"
        f"If you didn't request this, you can ignore this email.\n\n"
        f"— Bincio"
    )
    msg.attach(MIMEText(body, "plain"))

    with smtplib.SMTP(host, port, timeout=10) as s:
        s.starttls()
        s.login(user, password)
        s.send_message(msg)