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

import aiosmtplib

from app.engine.config import settings
from app.engine.services.cc_completion import cc_state_for, outbound_e164, outbound_number

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"}

# 平台默认发件人显示名(Task 9 前的硬编码值, 租户未配 sender_name 时沿用)
_DEFAULT_SENDER_NAME = "HESUPIPE"


def resolve_email_settings(config_data: dict | None) -> dict:
    """租户 config.email → 发信参数(Task 9 接线; env settings 回退)。

    回退规则(语义钉在 test_config_merge: 显式 None = 清空/未设置):
    - smtp 缺省或显式 None → 整段用 env SMTP_*;
    - smtp 给了 dict → 段内逐键回退(缺键/空串 → env 对应值, 租户可只改
      密码/只换 host);
    - sender_name 空 → 平台默认(_DEFAULT_SENDER_NAME);
    - notify_emails 空列表 → env NOTIFY_EMAIL 单元素。
    """
    email = ((config_data or {}).get("email")) or {}
    smtp = email.get("smtp") or {}
    notify = [e for e in (email.get("notify_emails") or []) if e]
    return {
        "host": smtp.get("host") or settings.SMTP_HOST,
        "port": smtp.get("port") or settings.SMTP_PORT,
        "user": smtp.get("user") or settings.SMTP_USER,
        "password": smtp.get("password") or settings.SMTP_PASS,
        "sender_name": email.get("sender_name") or _DEFAULT_SENDER_NAME,
        "notify_emails": notify or (
            [settings.NOTIFY_EMAIL] if settings.NOTIFY_EMAIL else []),
    }


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
    )


def _cc_views(contacts: dict, cc_info: dict | None) -> tuple[dict, dict]:
    """Task 6(spec §5)出站双视图：_cc 感知的正文/主题两套联系方式值。

    正文视图（body）：phone/whatsapp 有态 → e164 + 按 confirmed 标注；
    无 e164 → 裸号 +（缺国家区号）；canon 不匹配的残留态在 cc_state_for
    内判 None 回退原文。主题视图（subj）：同状态一律纯 e164 无标注
    （主题拥挤）。其余渠道（email/wechat）原样。
    """
    body: dict = {}
    subj: dict = {}
    for k, v in (contacts or {}).items():
        if not v:
            continue
        if k in ("phone", "whatsapp"):
            state = cc_state_for(cc_info, k, str(v))
            body[k] = outbound_number(str(v), state)
            subj[k] = outbound_e164(str(v), state)
        else:
            body[k] = str(v)
            subj[k] = str(v)
    return body, subj


async def _send(msg: MIMEMultipart, cfg: dict) -> bool:
    if not all([cfg["host"], cfg["user"], cfg["notify_emails"]]):
        logger.warning("SMTP not configured, skipping email")
        return False
    try:
        await aiosmtplib.send(
            msg, hostname=cfg["host"], port=cfg["port"],
            username=cfg["user"], password=cfg["password"],
            use_tls=True,
        )
        logger.info("Lead email sent to %s", cfg["notify_emails"])
        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 = "",
    cc_info: dict | None = None,
    config_data: dict | None = None,
) -> bool:
    """cc_info = raw_info["_cc"]（Task 6, spec §5）：正文联系方式行渲染
    补全号+标注、主题行号码用 e164 无标注；缺省（无 _cc/显式 + 号）行为不变。
    config_data = 租户配置(Task 9)：邮件参数经 resolve_email_settings 解析,
    None 走 env settings(平台默认)。"""
    tag = TAG_LABELS.get(intent_level, "未评估")
    contacts, subj_contacts = _cc_views(contact_info, cc_info)
    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 subj_contacts.items()
    ]
    subject = f"[新询盘·{tag}] {_flat(country)}"
    if contact_parts:
        subject += " | " + ", ".join(contact_parts)
    cfg = resolve_email_settings(config_data)
    msg["Subject"] = subject
    msg["From"] = f"【{cfg['sender_name']}】 <{cfg['user']}>"
    msg["To"] = ", ".join(cfg["notify_emails"])

    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, cfg)


async def send_returning_lead_email(
    contact_info: dict, cc_info: dict | None = None,
    config_data: dict | None = None,
) -> bool:
    """D5: 24h 内同联系方式再访,只发一行轻提醒。主题行号码走 e164(Task 6)。"""
    _body, subj_contacts = _cc_views(contact_info, cc_info)
    contact_parts = [
        f"{CONTACT_LABELS.get(k, k)}: {_flat(v)}" for k, v in subj_contacts.items()
    ]
    cfg = resolve_email_settings(config_data)
    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"【{cfg['sender_name']}】 <{cfg['user']}>"
    msg["To"] = ", ".join(cfg["notify_emails"])
    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, cfg)


async def send_correction_email(
    contact_info: dict, count: int = 1, cc_info: dict | None = None,
    config_data: dict | None = None,
) -> 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。
    正文联系方式行渲染补全号+标注(Task 6, spec §5 更正路径)。"""
    body_contacts, _subj = _cc_views(contact_info, cc_info)
    cfg = resolve_email_settings(config_data)
    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"【{cfg['sender_name']}】 <{cfg['user']}>"
    msg["To"] = ", ".join(cfg["notify_emails"])
    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(body_contacts)}</table>"
        f"</body></html>", "html", "utf-8"))
    return await _send(msg, cfg)