"""결과 이메일 발송.

1순위: Azure Communication Services(ACS) Email (endpoint + accesskey).
2순위(폴백): SMTP (aiosmtplib).
둘 다 미설정이면 EmailUnavailable 을 던진다(조용한 실패 0).
경기 종료 후 워커가 구독자(notify=True + email)에게 개인화 결과 메일 발송.
"""
from __future__ import annotations

import logging
from email.message import EmailMessage

from ..config import settings

log = logging.getLogger("triplepick.email")


class EmailUnavailable(RuntimeError):
    pass


async def _send_acs(to: str, subject: str, html: str, text: str) -> None:
    """Azure Communication Services Email — 키(accesskey) 인증."""
    from azure.communication.email.aio import EmailClient

    conn = f"endpoint={settings.azure_acs_endpoint};accesskey={settings.azure_acs_accesskey}"
    message = {
        "senderAddress": settings.azure_acs_sender,
        "recipients": {"to": [{"address": to}]},
        "content": {"subject": subject, "plainText": text, "html": html},
    }
    async with EmailClient.from_connection_string(conn) as client:
        poller = await client.begin_send(message)
        await poller.result()
    log.info("email sent via ACS → %s (%s)", to, subject)


async def _send_smtp(to: str, subject: str, html: str, text: str) -> None:
    import aiosmtplib

    msg = EmailMessage()
    msg["From"] = settings.smtp_from
    msg["To"] = to
    msg["Subject"] = subject
    msg.set_content(text)
    msg.add_alternative(html, subtype="html")

    await aiosmtplib.send(
        msg,
        hostname=settings.smtp_host,
        port=settings.smtp_port,
        username=settings.smtp_user or None,
        password=settings.smtp_password or None,
        start_tls=settings.smtp_starttls,
    )
    log.info("email sent via SMTP → %s (%s)", to, subject)


async def send_email(to: str, subject: str, html: str, text: str) -> None:
    if settings.acs_configured:
        await _send_acs(to, subject, html, text)
        return
    if settings.smtp_host:
        await _send_smtp(to, subject, html, text)
        return
    # ACS endpoint/accesskey 만 있고 sender 누락 시 명확히 안내
    if settings.azure_acs_endpoint and not settings.azure_acs_sender:
        raise EmailUnavailable("AZURE_ACS_SENDER(검증된 MailFrom 주소) 미설정")
    raise EmailUnavailable("이메일 미설정 — ACS(endpoint+accesskey+sender) 또는 SMTP 필요")


def build_result_email(
    *,
    team_a: str,
    team_b: str,
    result_a: int,
    result_b: int,
    my_a: int,
    my_b: int,
    my_points: int,
    ai_lines: list[tuple[str, bool]],  # (모델명, 적중여부)
    match_url: str,
) -> tuple[str, str, str]:
    """제목/HTML/텍스트 반환."""
    hit = my_points > 0
    headline = "적중! 🎯" if hit else "아쉽네요"
    subject = f"[TriplePick] {team_a} {result_a}-{result_b} {team_b} 결과 — {headline}"

    ai_html = "".join(
        f"<li>{m}: {'적중 ✓' if ok else '빗나감'}</li>" for m, ok in ai_lines
    )
    ai_text = "\n".join(
        f"  - {m}: {'적중' if ok else '빗나감'}" for m, ok in ai_lines
    )

    html = f"""\
<div style="font-family:sans-serif;max-width:480px;margin:0 auto">
  <h2>경기 결과</h2>
  <p style="font-size:20px;font-weight:bold">{team_a} {result_a} - {result_b} {team_b}</p>
  <p>당신의 예측: {team_a} {my_a} - {my_b} {team_b} →
     <strong>{my_points}점 ({headline})</strong></p>
  <h3>AI 3모델 적중 여부</h3>
  <ul>{ai_html}</ul>
  <p><a href="{match_url}">다음 경기 예측하러 가기 →</a></p>
  <p style="color:#888;font-size:12px">100만원 챌린지 — 누적 포인트 1위에게 최종 상금.</p>
</div>"""

    text = (
        f"경기 결과: {team_a} {result_a}-{result_b} {team_b}\n"
        f"당신의 예측: {team_a} {my_a}-{my_b} {team_b} → {my_points}점 ({headline})\n\n"
        f"AI 3모델 적중 여부:\n{ai_text}\n\n"
        f"다음 경기 예측: {match_url}\n"
    )
    return subject, html, text