"""美团 CPS 券列表 / 换链相关 schemas。"""
from __future__ import annotations

from typing import Any

from pydantic import BaseModel, Field


# ───────────────── 券卡片（归一化后给客户端） ─────────────────

class CouponCard(BaseModel):
    product_view_sign: str
    platform: int = Field(..., description="1=外卖/到家, 2=到店")
    biz_line: int | None = Field(None, description="到店子类: 1到餐 2到综 3酒店 4门票")

    name: str
    head_image_url: str
    brand_name: str | None = None
    brand_logo_url: str | None = None

    sell_price: str
    original_price: str
    discount_amount: str = Field(..., description="优惠金额 = 原价 - 现价")

    commission_rate: str = Field(..., description="佣金比例, 如 1.4%")
    commission_amount: str | None = Field(None, description="预估佣金元")

    sale_volume: str | None = None
    poi_name: str | None = Field(None, description="最近门店名")
    distance_text: str | None = Field(None, description="格式化距离, 如 600m / 1.5km")
    distance_meters: float | None = Field(None, description="原始距离(米)")
    available_poi_num: int | None = Field(None, description="可用门店数")

    coupon_num: int | None = Field(None, description="券张数(外卖兑换券)")
    valid_days: int | None = Field(None, description="券有效天数")
    price_label: str | None = Field(None, description="如 15天低价")
    rank_label: str | None = Field(None, description="如 2小时北京外卖销量榜第1名")
    rating_label: str | None = Field(None, description="如 4.6分")

    @classmethod
    def from_raw(cls, item: dict[str, Any]) -> CouponCard:
        cpd = item.get("couponPackDetail") or {}
        brand = item.get("brandInfo") or {}
        comm = item.get("commissionInfo") or {}
        poi = item.get("deliverablePoiInfo") or {}
        avail = item.get("availablePoiInfo") or {}
        label = cpd.get("productLabel") or {}
        price_lbl = label.get("pricePowerLabel") or {}
        valid_info = item.get("couponValidTimeInfo") or {}

        platform = cpd.get("platform") or 1
        biz_line = cpd.get("bizLine")

        head_url = cpd.get("headUrl") or ""
        if "@" in head_url:
            head_url = head_url.split("@")[0]

        sell = cpd.get("sellPrice") or "0"
        orig = cpd.get("originalPrice") or "0"
        try:
            discount = f"{float(orig) - float(sell):.2f}"
        except (ValueError, TypeError):
            discount = "0"

        cp = comm.get("commissionPercent") or "0"
        try:
            rate = f"{float(cp) / 100:.1f}%"
        except (ValueError, TypeError):
            rate = "0%"

        raw_dist = poi.get("deliveryDistance")
        dist_meters: float | None = None
        dist_text: str | None = None
        if raw_dist not in (None, "null", ""):
            try:
                d = float(raw_dist)
                dist_meters = d * 1000 if platform == 1 else d
                if dist_meters < 1000:
                    dist_text = f"{int(dist_meters)}m"
                else:
                    dist_text = f"{dist_meters / 1000:.1f}km"
            except (ValueError, TypeError):
                pass

        return cls(
            product_view_sign=cpd.get("productViewSign") or cpd.get("skuViewId") or "",
            platform=platform,
            biz_line=biz_line,
            name=cpd.get("name") or "",
            head_image_url=head_url,
            brand_name=brand.get("brandName"),
            brand_logo_url=brand.get("brandLogoUrl"),
            sell_price=sell,
            original_price=orig,
            discount_amount=discount,
            commission_rate=rate,
            commission_amount=comm.get("commission"),
            sale_volume=cpd.get("saleVolume"),
            poi_name=poi.get("poiName"),
            distance_text=dist_text,
            distance_meters=dist_meters,
            available_poi_num=avail.get("availablePoiNum"),
            coupon_num=cpd.get("couponNum"),
            valid_days=valid_info.get("couponValidDay"),
            price_label=price_lbl.get("historyPriceLabel") or price_lbl.get("beatMTLabel"),
            rank_label=label.get("productRankLabel"),
            rating_label=label.get("dianPingRankLabel"),
        )


# ───────────────── 券列表 请求 / 响应 ─────────────────

class CouponListRequest(BaseModel):
    longitude: float = Field(..., description="经度, 如 116.404")
    latitude: float = Field(..., description="纬度, 如 39.928")
    platform: int = Field(1, description="1=外卖/到家, 2=到店")
    biz_line: int | None = Field(None, description="到店子类: 1到餐 2到综 3酒店 4门票; 外卖不填")
    list_topic_id: int | None = Field(3, description="榜单: 1精选 2今日必推 3爆款筛选 5限时筛选")
    keyword: str | None = Field(None, description="搜索关键词(填了会忽略 list_topic_id)")
    sort_field: int | None = Field(None, description="1价格 2销量 6离我最近; 搜索默认6")
    search_id: str | None = Field(None, description="翻页token, 首页不填")
    page: int = Field(1, ge=1)
    page_size: int = Field(20, ge=1, le=20)


class CouponListResponse(BaseModel):
    items: list[CouponCard]
    has_next: bool = False
    search_id: str | None = None


class FeedRequest(BaseModel):
    longitude: float = Field(..., description="经度")
    latitude: float = Field(..., description="纬度")
    page: int = Field(1, ge=1)
    page_size: int = Field(20, ge=1, le=20)


class FeedResponse(BaseModel):
    items: list[CouponCard]
    has_next: bool = False
    page: int = 1


# ───────────────── 换链 请求 / 响应 ─────────────────

class ReferralLinkRequest(BaseModel):
    product_view_sign: str = Field(..., min_length=1)
    platform: int = Field(1, description="1=外卖/到家, 2=到店")
    biz_line: int | None = None
    sid: str | None = Field(None, description="渠道追踪标识, 不填用默认")
    link_type_list: list[int] | None = Field(None, description="1=H5长链 2=H5短链 3=deeplink; 不填默认[1,3]")


class ReferralLinkResponse(BaseModel):
    link: str = Field(..., description="默认推广链接")
    link_map: dict[str, str] = Field(default_factory=dict, description="各类型链接 {linkType: url}")