import smtplib
import logging
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from src.config import EmailAccount
from src.retry import retry

logger = logging.getLogger(__name__)


@retry()
def send_reply(account: EmailAccount, to_addr: str, subject: str, body: str):
    if not account.smtp:
        raise RuntimeError(f"账号 {account.username} 未配置 SMTP")

    s = account.smtp
    logger.info("SMTP 连接: %s:%d (ssl=%s)", s.server, s.port, s.use_ssl)
    if s.use_ssl:
        conn = smtplib.SMTP_SSL(s.server, s.port, timeout=15)
    else:
        conn = smtplib.SMTP(s.server, s.port, timeout=15)
        if s.use_starttls:
            conn.starttls()

    conn.login(account.username, account.password)
    logger.info("SMTP 登录成功")

    reply_subject = subject if subject.lower().startswith("re:") else f"Re: {subject}"
    logger.info("SMTP 发送: to=%s subject=%s body=%d 字符", to_addr, reply_subject, len(body))

    msg = MIMEMultipart("alternative")
    msg["From"] = account.username
    msg["To"] = to_addr
    msg["Subject"] = reply_subject
    msg.attach(MIMEText(body, "plain", "utf-8"))

    conn.sendmail(account.username, [to_addr], msg.as_string())
    conn.quit()
    logger.info("SMTP 发送完成")