# mailer.py
import os
import smtplib
from email.message import EmailMessage
from typing import Optional

def send_email_smtp(to: str, subject: str, body: str, attachment_path: Optional[str] = None):
    host = os.getenv("SMTP_HOST")
    port = int(os.getenv("SMTP_PORT", "587"))
    user = os.getenv("SMTP_USER")
    password = os.getenv("SMTP_PASS")
    sender = os.getenv("SMTP_FROM", user or "no-reply@example.com")
    use_tls = os.getenv("SMTP_USE_TLS", "1") == "1"

    if not host or not user or not password:
        # 環境未設定なら NOOP（成功扱いにして詳細メッセージを返す）
        return True, "SMTP not configured; skipped sending (set SMTP_HOST/SMTP_PORT/SMTP_USER/SMTP_PASS/SMTP_FROM)"

    msg = EmailMessage()
    msg["From"] = sender
    msg["To"] = to
    msg["Subject"] = subject
    msg.set_content(body)

    if attachment_path:
        with open(attachment_path, "rb") as f:
            data = f.read()
        msg.add_attachment(data, maintype="application", subtype="pdf", filename=os.path.basename(attachment_path))

    try:
        with smtplib.SMTP(host, port) as server:
            if use_tls:
                server.starttls()
            server.login(user, password)
            server.send_message(msg)
        return True, "sent"
    except Exception as e:
        return False, f"send failed: {e}"