import html
import logging
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

import aiosmtplib

from app.config import settings

logger = logging.getLogger(__name__)

TAG_LABELS = {
    "interested": "意向强", "pending": "待确认",
    "not_interested": "无意向", "": "未评估",
}
CONTACT_LABELS = {"phone": "手机", "whatsapp": "WhatsApp", "email": "邮箱", "wechat": "微信"}


def _esc(v) -> str:
    return html.escape(str(v)) if v else ""


def _flat(v) -> str:
    """主题行用：折叠空白（堵换行注入头部的通道）+ 限长。"""
    return " ".join(str(v).split())[:60]


def _contact_rows(contacts: dict) -> str:
    return "".join(
        f"<tr><td style='padding:6px 12px;font-weight:bold;'>{html.escape(CONTACT_LABELS.get(k, k))}</td>"
        f"<td style='padding:6px 12px;'>{_esc(v)}</td></tr>"
        for k, v in (contacts or {}).items() if v
    )


async def _send(msg: MIMEMultipart) -> bool:
    if not all([settings.SMTP_HOST, settings.SMTP_USER, settings.NOTIFY_EMAIL]):
        logger.warning("SMTP not configured, skipping email")
        return False
    try:
        await aiosmtplib.send(
            msg, hostname=settings.SMTP_HOST, port=settings.SMTP_PORT,
            username=settings.SMTP_USER, password=settings.SMTP_PASS,
            use_tls=True,
        )
        logger.info("Lead email sent to %s", settings.NOTIFY_EMAIL)
        return True
    except Exception:
        logger.exception("Failed to send lead email")
        return False


async def send_lead_email(
    customer_profile: dict,
    contact_info: dict,
    reasoning: str,
    conversation_messages: list[dict],
    intent_level: str = "",
) -> bool:
    tag = TAG_LABELS.get(intent_level, "未评估")
    contacts = dict(contact_info or {})
    country = (customer_profile or {}).get("目标国家", "")
    if not country:
        country = (customer_profile or {}).get("target_country", "未知")

    msg = MIMEMultipart("alternative")
    contact_parts = [
        f"{CONTACT_LABELS.get(k, k)}: {_flat(v)}" for k, v in contacts.items() if v
    ]
    subject = f"[新询盘·{tag}] {_flat(country)}"
    if contact_parts:
        subject += " | " + ", ".join(contact_parts)
    msg["Subject"] = subject
    msg["From"] = f"【HESUPIPE】 <{settings.SMTP_USER}>"
    msg["To"] = settings.NOTIFY_EMAIL

    info_rows = "".join(
        f"<tr><td style='padding:6px 12px;font-weight:bold;'>{_esc(k)}</td>"
        f"<td style='padding:6px 12px;'>{_esc(v)}</td></tr>"
        for k, v in (customer_profile or {}).items() if not str(k).startswith("_")
    )
    chat_lines = "".join(
        f"<div style='margin:4px 0;'><b>{'客户' if m.get('role') == 'user' else 'AI'}:</b> {_esc(m.get('content', ''))}</div>"
        for m in conversation_messages or []
    )

    html_body = f"""
    <html><body style="font-family:sans-serif;color:#333;">
      <h2>🎉 新询盘（{html.escape(tag)}）</h2>
      <h3>联系方式</h3>
      <table style="border-collapse:collapse;border:1px solid #ddd;">{_contact_rows(contacts)}</table>
      <h3>客户画像</h3>
      <table style="border-collapse:collapse;border:1px solid #ddd;">{info_rows}</table>
      <h3>评估理由</h3><p>{_esc(reasoning)}</p>
      <h3>完整对话记录</h3>
      <div style="background:#f5f5f5;padding:12px;border-radius:6px;">{chat_lines}</div>
      <p style="color:#999;font-size:12px;">注：邮件为触发时快照，对话可能仍在进行，最新记录请以后台为准。</p>
    </body></html>
    """
    msg.attach(MIMEText(html_body, "html", "utf-8"))
    return await _send(msg)


async def send_returning_lead_email(contact_info: dict) -> bool:
    """D5: 24h 内同联系方式再访,只发一行轻提醒。"""
    contact_parts = [
        f"{CONTACT_LABELS.get(k, k)}: {_flat(v)}" for k, v in (contact_info or {}).items() if v
    ]
    msg = MIMEMultipart("alternative")
    msg["Subject"] = f"[线索回访] {' | '.join(contact_parts) or '已知客户'}再次来访"
    msg["From"] = f"【HESUPIPE】 <{settings.SMTP_USER}>"
    msg["To"] = settings.NOTIFY_EMAIL
    msg.attach(MIMEText(
        f"<html><body><p>该联系方式 24h 内已发过完整询盘，客户又开启了新对话，"
        f"详情请查后台。</p></body></html>", "html", "utf-8"))
    return await _send(msg)


async def send_correction_email(contact_info: dict, count: int = 1) -> bool:
    """D4: 联系方式变化(改号/新增/无提示换值)后的轻量更正邮件,每会话上限3封。"""
    msg = MIMEMultipart("alternative")
    msg["Subject"] = f"[询盘·更正{count}] 客户联系方式已更新（以本封为准）"
    msg["From"] = f"【HESUPIPE】 <{settings.SMTP_USER}>"
    msg["To"] = settings.NOTIFY_EMAIL
    msg.attach(MIMEText(
        f"<html><body><p>这是本会话第 {count} 次更正（上限 3 次），请以本封为准：</p>"
        f"<table>{_contact_rows(contact_info)}</table>"
        f"</body></html>", "html", "utf-8"))
    return await _send(msg)