"""Async email sending via SMTP. Falls back to logging if SMTP is not configured."""
import logging
import os
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

import aiosmtplib

logger = logging.getLogger(__name__)

SMTP_HOST = os.getenv("SMTP_HOST", "")
SMTP_PORT = int(os.getenv("SMTP_PORT", "587"))
SMTP_USER = os.getenv("SMTP_USER", "")
SMTP_PASSWORD = os.getenv("SMTP_PASSWORD", "")
SMTP_FROM = os.getenv("SMTP_FROM", SMTP_USER)
SMTP_SSL = os.getenv("SMTP_SSL", "false").lower() == "true"
SMTP_TLS = os.getenv("SMTP_TLS", "true").lower() != "false"

SITE_NAME = "Skins & Pins"


def _configured() -> bool:
    return bool(SMTP_HOST and SMTP_USER and SMTP_FROM)


async def _send(to: str, subject: str, body_text: str, body_html: str) -> None:
    msg = MIMEMultipart("alternative")
    msg["Subject"] = subject
    msg["From"] = f"{SITE_NAME} <{SMTP_FROM}>"
    msg["To"] = to
    msg.attach(MIMEText(body_text, "plain"))
    msg.attach(MIMEText(body_html, "html"))

    await aiosmtplib.send(
        msg,
        hostname=SMTP_HOST,
        port=SMTP_PORT,
        username=SMTP_USER,
        password=SMTP_PASSWORD,
        use_tls=SMTP_SSL,
        start_tls=(SMTP_TLS and not SMTP_SSL),
        timeout=10,
    )


async def send_magic_link(to: str, link: str) -> None:
    subject = f"Your {SITE_NAME} login link"
    body_text = f"Click the link below to log in (expires in 15 minutes):\n\n{link}\n\nIf you didn't request this, you can ignore this email."
    body_html = f"""
<div style="font-family:sans-serif;max-width:480px;margin:auto;">
  <h2 style="color:#2d6a4f;">⛳ {SITE_NAME}</h2>
  <p>Click the button below to log in. This link expires in 15 minutes.</p>
  <p style="margin:2rem 0;">
    <a href="{link}"
       style="background:#2d6a4f;color:#fff;padding:0.75rem 1.5rem;border-radius:0.5rem;text-decoration:none;font-weight:600;">
      Log in to {SITE_NAME}
    </a>
  </p>
  <p style="color:#888;font-size:0.85rem;">If the button doesn't work, copy this link:<br>{link}</p>
  <p style="color:#888;font-size:0.85rem;">If you didn't request this, you can ignore this email.</p>
</div>"""

    if _configured():
        try:
            await _send(to, subject, body_text, body_html)
            logger.info("Magic link email sent to %s", to)
        except Exception as e:
            logger.error("Failed to send magic link email to %s: %s", to, e)
    else:
        logger.info("Magic link for %s: %s", to, link)


async def send_invitation(to: str, invited_by_name: str, login_url: str) -> None:
    subject = f"You've been invited to {SITE_NAME}"
    body_text = f"{invited_by_name} has invited you to join {SITE_NAME}.\n\nLog in here:\n{login_url}"
    body_html = f"""
<div style="font-family:sans-serif;max-width:480px;margin:auto;">
  <h2 style="color:#2d6a4f;">⛳ {SITE_NAME}</h2>
  <p><strong>{invited_by_name}</strong> has invited you to join {SITE_NAME} — a golf score tracking app.</p>
  <p style="margin:2rem 0;">
    <a href="{login_url}"
       style="background:#2d6a4f;color:#fff;padding:0.75rem 1.5rem;border-radius:0.5rem;text-decoration:none;font-weight:600;">
      Accept invitation
    </a>
  </p>
  <p style="color:#888;font-size:0.85rem;">If the button doesn't work, copy this link:<br>{login_url}</p>
</div>"""

    if _configured():
        try:
            await _send(to, subject, body_text, body_html)
            logger.info("Invitation email sent to %s", to)
        except Exception as e:
            logger.error("Failed to send invitation email to %s: %s", to, e)
    else:
        logger.info("Invitation for %s — login at: %s", to, login_url)