"""应用 2a 区域财务洞察 Prompt 拼装（app2_finance 的区域派生版本）。

面向 72 组合中 area != 'all' 的 64 个组合（8 时间 × 8 业态）。

差异点（相较 app2_finance）：
- payload 新增顶层字段：「业态说明」「区域占比」
- 派生比率精简：仅「人力成本占成交收入比」「优惠侵蚀率」（其他比率区域级无法计算）
- 单位经济区域级：支持客单价/日均订单数及环比（暂不输出会员占比，与 v1.2 system prompt H6 对齐）
- 按星期聚合区域级：无「日均现金流入」（区域级无 cash_inflow 数据）
- 日粒度异常区域级：仅对 gross_amount 做异常检测（无 cash_inflow）
- 不注入：预收资产/现金流入/现金流出/储值卡余额变化（全店级字段，区域级无业务意义）

数据源：
- 主数据：board_service.get_finance_board(time, area, compare=1)
- 日粒度：etl 库 app.v_dws_finance_area_daily（按 area_code 过滤）
- 区域占比：调用 board_service 两次（一次区域 + 一次 all）后派生
"""

from __future__ import annotations

import logging
from collections import defaultdict
from datetime import datetime
from typing import Any

from app.services.board_service import _calc_date_range, _calc_prev_range, get_finance_board

# 复用 app2_finance_prompt 的公共常量与辅助函数
from app.ai.prompts.app2_finance_prompt import (
    AREA_LABELS,
    DIMENSION_LABELS,
    DIMENSION_MAP,
    INDUSTRY_BASELINES,
    _aggregate_expense,
    _build_coach_kpi,
    _build_discount_kpi,
    _slim,
    _translate_keys,
    _WEEKDAY_MIN_DAYS,
    _ANOMALY_DEVIATION,
    _ANOMALY_MAX_ITEMS,
    _ANOMALY_MIN_DAYS,
    _ANOMALY_MIN_SAME_WEEKDAY,
    _WEEKDAY_ZH,
)

logger = logging.getLogger(__name__)


# 业态特征字典（与 v1.2 system prompt「三、业态特征」章节对齐）
# trait：业态的数据表征（客单/订单密度/会员占比/周期规律）
# peer：典型对比项（给 AI 做区域对比时的参照方向）
AREA_INDUSTRY_TRAITS: dict[str, dict[str, str]] = {
    "hall": {
        "trait": "大厅（合并 hallA+B+C）· 散客主力 · 客单价中等 · 订单密度最高 · 会员占比相对低",
        "peer": "与 VIP 包厢对比单客贡献差异 · 与团购占比对比获客成本",
    },
    "hallA": {
        "trait": "A 区大厅 · 散客主力 · 客单价中等 · 订单密度高",
        "peer": "与 hallB/hallC 对比识别区位差异 · 与 hall 合计对比看单区占比",
    },
    "hallB": {
        "trait": "B 区大厅 · 散客主力 · 客单价中等 · 订单密度高",
        "peer": "与 hallA/hallC 对比识别区位差异",
    },
    "hallC": {
        "trait": "C 区大厅（含 TV 台/美洲豹赛台）· 散客主力 · 客单价中等偏上 · 订单密度较高",
        "peer": "与 hallA/hallB 对比识别区位差异",
    },
    "vip": {
        "trait": "VIP 台球包厢 · 会员主力 · 客单价显著高于大厅 2-3 倍 · 订单密度低 · 助教服务收入占比高",
        "peer": "与 hall 大厅对比单客贡献 · 与 snooker 对比高客单群体差异",
    },
    "snooker": {
        "trait": "斯诺克 · 专业台球爱好者 · 客单价中高 · 会员占比较高 · 周末/夜场爆满",
        "peer": "与 VIP 对比高端群体结构 · 与 hall 对比专业 vs 大众",
    },
    "mahjong": {
        "trait": "麻将房 · 散客 + 小团 · 客单价高（时长计费）· 停留久 · 订单密度低 · 助教参与度极低",
        "peer": "与 KTV 对比包间型业态 · 与 hall 对比客单价与时长",
    },
    "ktv": {
        "trait": "团建房 · 团建场景 · 客单价集中在套餐 · 订单密度低 · 周末峰值明显 · 助教几乎不参与",
        "peer": "与 mahjong 对比包间型业态 · 与 vip 对比高客单群体",
    },
}


def _fetch_area_daily_series(
    site_id: int, start_date: str, end_date: str, area_code: str,
) -> list[tuple] | None:
    """查区域级日粒度 [start, end]，供单位经济/按星期/异常检测复用。

    返回字段顺序：(stat_date, gross, order_count, member_order_count, confirmed)
    注：区域级无 cash_inflow（对齐 v1.2 H6 降级），故与全店版 series 字段少一个 cash_in。

    area_code 必须为非 "all" 的具体业态编码。
    """
    from app.database import get_connection
    from app.services.fdw_queries import _fdw_context

    try:
        conn = get_connection()
    except Exception:
        logger.debug("区域日粒度查询连接失败", exc_info=True)
        return None

    try:
        with _fdw_context(conn, site_id) as cur:
            cur.execute(
                """
                SELECT stat_date,
                       COALESCE(gross_amount, 0)        AS gross,
                       COALESCE(order_count, 0)         AS order_count,
                       COALESCE(member_order_count, 0)  AS member_order_count,
                       COALESCE(confirmed_income, 0)    AS confirmed
                  FROM app.v_dws_finance_area_daily
                 WHERE area_code = %s
                   AND stat_date >= %s::date
                   AND stat_date <= %s::date
                 ORDER BY stat_date
                """,
                (area_code, start_date, end_date),
            )
            rows = cur.fetchall()
    except Exception:
        logger.debug(
            "区域日粒度查询失败: site_id=%s area=%s", site_id, area_code, exc_info=True,
        )
        return None
    finally:
        try:
            conn.close()
        except Exception:
            pass

    active = [
        (r[0], float(r[1]), int(r[2] or 0), int(r[3] or 0), float(r[4] or 0))
        for r in rows
        if float(r[1] or 0) > 0
    ]
    return active if active else None


def _build_area_unit_economics(
    series: list[tuple] | None,
    prev_series: list[tuple] | None = None,
) -> dict | None:
    """区域级单位经济：客单价 + 日均订单数（含环比）。

    与全店版差异：
    - 不输出「会员订单占比」（对齐 v1.2 system prompt H6 · 等 DWS 回填完成 + A/B 评估后再开放）
    - series 字段顺序：(stat_date, gross, order_count, member_order_count, confirmed)

    月初场景（上期样本 < 5 天）附加"样本不足"后缀让 AI 降权引用。
    """
    if not series:
        return None
    total_orders = sum(r[2] for r in series)
    if total_orders <= 0:
        return None
    total_gross = sum(r[1] for r in series)
    total_confirmed = sum(r[4] for r in series)
    days = len(series)

    price_confirmed = total_confirmed / total_orders
    price_gross = total_gross / total_orders
    daily_orders = total_orders / days

    out: dict[str, Any] = {
        "总订单数": total_orders,
        "日均订单数": round(daily_orders, 1),
        "客单价_按成交收入": round(price_confirmed, 2),
        "客单价_按发生额": round(price_gross, 2),
    }

    if prev_series:
        prev_orders = sum(r[2] for r in prev_series)
        if prev_orders > 0:
            prev_days = len(prev_series)
            prev_gross = sum(r[1] for r in prev_series)
            prev_confirmed = sum(r[4] for r in prev_series)
            low_sample = prev_days < 5

            def _pct_change(cur: float, prev: float) -> str:
                if prev <= 0:
                    return "无上期数据"
                value = f"{(cur - prev) / prev * 100:+.1f}%"
                return f"{value}（上期仅 {prev_days} 天，样本不足仅供参考）" if low_sample else value

            out["客单价_按成交收入_环比"] = _pct_change(price_confirmed, prev_confirmed / prev_orders)
            out["客单价_按发生额_环比"] = _pct_change(price_gross, prev_gross / prev_orders)
            out["日均订单数_环比"] = _pct_change(daily_orders, prev_orders / prev_days)
    return out


def _aggregate_by_weekday_area(series: list[tuple] | None) -> dict | None:
    """区域级按星期聚合（无现金流入字段）。

    series 字段顺序：(stat_date, gross, order_count, member_order_count, confirmed)
    """
    if not series or len(series) < _WEEKDAY_MIN_DAYS:
        return None
    buckets: dict[int, list[tuple]] = defaultdict(list)
    for row in series:
        buckets[row[0].weekday()].append(row)
    out: dict[str, dict] = {}
    for wd in range(7):
        rows = buckets.get(wd) or []
        if not rows:
            continue
        n = len(rows)
        out[_WEEKDAY_ZH[wd]] = {
            "日均发生额": round(sum(r[1] for r in rows) / n, 2),
            "日均订单数": round(sum(r[2] for r in rows) / n, 1),
            "营业日数": n,
        }
    return out or None


def _detect_anomaly_days_area(
    series: list[tuple] | None,
) -> list[dict] | None:
    """区域级日粒度异常（仅对 gross_amount 做，无现金流入）。

    series 字段顺序：(stat_date, gross, order_count, member_order_count, confirmed)
    """
    if not series or len(series) < _ANOMALY_MIN_DAYS:
        return None

    def _scan(idx: int, label: str) -> list[dict]:
        vals = [row[idx] for row in series]
        global_mean = sum(vals) / len(vals)
        if global_mean <= 0:
            return []

        by_weekday: dict[int, list[float]] = defaultdict(list)
        for d, *metrics in series:
            by_weekday[d.weekday()].append(metrics[idx - 1])
        weekday_mean: dict[int, float] = {
            wd: (sum(xs) / len(xs)) for wd, xs in by_weekday.items()
        }

        flagged: list[dict] = []
        for d, *metrics in series:
            v = metrics[idx - 1]
            wd = d.weekday()
            same_count = len(by_weekday.get(wd, []))
            if same_count >= _ANOMALY_MIN_SAME_WEEKDAY and weekday_mean[wd] > 0:
                base = weekday_mean[wd]
                base_label = f"同{_WEEKDAY_ZH[wd]}均值"
            else:
                base = global_mean
                base_label = "期均"

            deviation = (v - base) / base
            if abs(deviation) >= _ANOMALY_DEVIATION:
                flagged.append({
                    "日期": f"{d} {_WEEKDAY_ZH[wd]}",
                    "指标": label,
                    "当日": round(v, 2),
                    "基线": round(base, 2),
                    "基线类型": base_label,
                    "偏离": f"{deviation * 100:+.1f}%",
                    "_abs_dev": abs(deviation),
                })
        return flagged

    candidates = _scan(1, "发生额")  # 区域级仅发生额做异常（无现金流入）
    if not candidates:
        return None
    candidates.sort(key=lambda x: x["_abs_dev"], reverse=True)
    out = []
    for c in candidates[:_ANOMALY_MAX_ITEMS]:
        c.pop("_abs_dev", None)
        out.append(c)
    return out


async def _fetch_area_share(
    site_id: int, time_dimension: str, area_confirmed: float,
) -> dict | None:
    """查全店成交收入 + 上期全店成交收入，派生「区域占比」字段。

    返回：{本区域成交收入, 占全店成交收入, 占比环比}
    失败或数据不足返回 None。
    """
    board_time = DIMENSION_MAP.get(time_dimension)
    if not board_time:
        return None
    try:
        all_board = await get_finance_board(
            time=board_time, area="all", compare=1, site_id=site_id,
        )
    except Exception:
        logger.debug("区域占比·全店数据查询失败", exc_info=True)
        return None

    all_overview = (all_board or {}).get("overview") or {}
    all_confirmed = float(all_overview.get("confirmed_revenue") or 0)
    if all_confirmed <= 0:
        return None

    share = area_confirmed / all_confirmed
    out: dict[str, Any] = {
        "本区域成交收入": round(area_confirmed, 2),
        "全店成交收入": round(all_confirmed, 2),
        "占全店成交收入": f"{share * 100:.1f}%",
    }
    # 环比：上期区域占比（本轮简化：若 all 的 confirmed_revenue_compare 可用，则给出"全店环比参照"让 AI 自己对比）
    # 本区域占比环比 = （本期区域占比 − 上期区域占比），需查上期 area board，为避免额外 DB 访问，暂只给出本期占比
    return out


def _build_area_derived_ratios(
    overview: dict | None, coach_kpi: dict | None, discount_kpi: dict | None,
) -> dict | None:
    """区域级派生比率：仅「人力成本占成交收入比」「优惠侵蚀率」。

    其他比率（储值卡占比/结余率）区域级无数据，不输出。
    """
    if not isinstance(overview, dict):
        return None
    confirmed = float(overview.get("confirmed_revenue") or 0)
    ratios: dict[str, Any] = {}

    if coach_kpi and confirmed > 0:
        total_pay = float(coach_kpi.get("人力薪酬合计") or 0)
        if total_pay > 0:
            ratios["人力成本占成交收入比"] = round(total_pay / confirmed, 4)

    if discount_kpi and confirmed > 0:
        total_discount = float(discount_kpi.get("总优惠") or 0)
        gross = float(overview.get("occurrence") or 0)
        if gross > 0:
            ratios["优惠侵蚀率"] = round(total_discount / gross, 4)

    return ratios or None


async def build_prompt(
    context: dict,
    cache_svc: Any | None = None,  # 兼容统一签名
) -> str:
    """构建 app2a 区域财务洞察 prompt 字符串。

    Args:
        context: site_id, time_dimension, area（area != 'all'）

    Returns:
        JSON 序列化的 prompt 字符串，字段已翻译为中文。

    Raises:
        ValueError: time_dimension 不支持 · area 为 'all' · area 不在白名单
    """
    import json

    site_id = context["site_id"]
    time_dimension = context["time_dimension"]
    area = context.get("area")

    if area == "all":
        raise ValueError("app2a_finance_area 仅处理区域组合 · area='all' 应走 app2_finance")
    if area not in AREA_LABELS:
        raise ValueError(f"app2a_finance_area 不支持的区域: {area}")

    board_time = DIMENSION_MAP.get(time_dimension)
    if not board_time:
        raise ValueError(f"app2a_finance_area 不支持的时间维度: {time_dimension}")

    try:
        board_data = await get_finance_board(
            time=board_time, area=area, compare=1, site_id=site_id,
        )
    except Exception:
        logger.warning(
            "app2a 财务看板查询失败: site_id=%s dimension=%s area=%s",
            site_id, time_dimension, area, exc_info=True,
        )
        board_data = {}

    overview = board_data.get("overview") if isinstance(board_data, dict) else None
    revenue = board_data.get("revenue") if isinstance(board_data, dict) else None
    coach = board_data.get("coach_analysis") if isinstance(board_data, dict) else None
    expense = board_data.get("expense") if isinstance(board_data, dict) else None

    discount_kpi = _build_discount_kpi(revenue, overview)
    coach_kpi = _build_coach_kpi(coach)
    expense_kpi = _aggregate_expense(expense)
    ratios = _build_area_derived_ratios(overview, coach_kpi, discount_kpi)

    # 原始数据 slim 后翻译，供 AI 追溯细节
    slim_data = _slim(board_data) or {}
    raw_cn = _translate_keys(slim_data)

    # 对比口径（所有环比字段的前置依赖 · H1）
    compare_caliber: dict[str, Any] | None = None
    try:
        cur_start, cur_end = _calc_date_range(board_time)
        prev_start, prev_end = _calc_prev_range(board_time, cur_start, cur_end)
        cur_days = (cur_end - cur_start).days + 1
        prev_days = (prev_end - prev_start).days + 1
        compare_caliber = {
            "当期范围": f"{cur_start} ~ {cur_end}（{cur_days} 天）",
            "对比期范围": f"{prev_start} ~ {prev_end}（{prev_days} 天）",
            "对齐方式": "上期同天数对齐（非整月/整周对比）",
            "说明": "所有 _环比 / _compare 字段均按上表口径计算；月中调用时对比期会自动截断到与当期相同天数",
        }
    except Exception:
        logger.debug("对比口径字段生成失败（不影响主流程）", exc_info=True)

    # 业态说明（v1.2 system prompt H7 引用依据）
    trait_info = AREA_INDUSTRY_TRAITS.get(area, {})
    industry_brief = {
        "区域编码": area,
        "区域名称": AREA_LABELS.get(area, area),
        "业态特征": trait_info.get("trait", "—"),
        "典型对比项": trait_info.get("peer", "—"),
    }

    payload: dict[str, Any] = {
        "当前时间": datetime.now().strftime("%Y-%m-%d %H:%M"),
        "门店编号": site_id,
        "时间维度": DIMENSION_LABELS.get(time_dimension, time_dimension),
        "区域": AREA_LABELS.get(area, area),
        **({"对比口径": compare_caliber} if compare_caliber else {}),
        "业态说明": industry_brief,
        "核心KPI": {
            "发生额": float((overview or {}).get("occurrence") or 0),
            "发生额环比": (overview or {}).get("occurrence_compare") or "持平",
            "成交收入": float((overview or {}).get("confirmed_revenue") or 0),
            "成交收入环比": (overview or {}).get("confirmed_revenue_compare") or "持平",
            # 区域级无现金流入数据（v1.2 H6 降级），不输出现金相关 KPI
        },
    }

    # 派生比率（仅 2 项）
    if ratios:
        payload["派生比率"] = ratios

    # 区域占比（需异步查全店）
    area_confirmed = float((overview or {}).get("confirmed_revenue") or 0)
    if area_confirmed > 0:
        area_share = await _fetch_area_share(site_id, time_dimension, area_confirmed)
        if area_share:
            payload["区域占比"] = area_share

    # 优惠构成（复用全店版逻辑）
    if discount_kpi:
        payload["优惠构成"] = discount_kpi

    # 助教成本画像（复用全店版逻辑 · 空则整块不注入 · 符合 v1.2 H6）
    if coach_kpi:
        payload["助教成本"] = coach_kpi

    # 支出概况（区域级仅助教支出有效，v1.2 禁谈运营/固定/平台支出 · 但注入给 AI 追溯）
    # 注：v1.2 system prompt 明确要求 D 板块禁谈这三类，AI 自会规避
    if expense_kpi:
        payload["支出概况"] = expense_kpi

    # 日粒度派生（区域级）
    try:
        start_date, end_date = _calc_date_range(board_time)
        series = _fetch_area_daily_series(
            site_id, str(start_date), str(end_date), area_code=area,
        )
        prev_series: list[tuple] | None = None
        try:
            prev_start, prev_end = _calc_prev_range(board_time, start_date, end_date)
            prev_series = _fetch_area_daily_series(
                site_id, str(prev_start), str(prev_end), area_code=area,
            )
        except Exception:
            logger.debug("区域上期 series 查询失败，客单价环比字段将省略", exc_info=True)

        if series:
            unit_econ = _build_area_unit_economics(series, prev_series=prev_series)
            if unit_econ:
                payload["单位经济"] = unit_econ
            by_weekday = _aggregate_by_weekday_area(series)
            if by_weekday:
                payload["按星期聚合"] = by_weekday
            anomalies = _detect_anomaly_days_area(series)
            if anomalies:
                payload["日粒度异常"] = anomalies
    except Exception:
        logger.debug("区域日粒度派生字段注入失败（不影响主流程）", exc_info=True)

    # 行业基线
    payload["行业基线"] = INDUSTRY_BASELINES

    # 原始指标（slim 后的区域子集）
    payload["原始指标"] = raw_cn

    if not board_data:
        payload["数据缺失提示"] = "区域财务看板数据获取失败，请基于已有缓存或常识分析"

    return json.dumps(payload, ensure_ascii=False, default=str)