"""按供应商名对上搜到的仓。无 sku_id 时靠条形码结果 + 商家全称。"""
from __future__ import annotations

from dataclasses import dataclass, field
from typing import Any

SELF_OPERATED_PREFIX = "[自营]"
PACK_KEYS = ("middlePackNum", "midPackQty", "packNum", "packQty")


@dataclass
class CartOffer:
    sku_id: str
    vendor_raw: str
    vendor_norm: str
    stock: float | None
    price: float | None = None
    extra: dict[str, Any] = field(default_factory=dict)


def normalize_supplier(raw: str) -> str:
    text = (raw or "").replace("\u3000", " ").strip()
    if text.startswith(SELF_OPERATED_PREFIX):
        text = text[len(SELF_OPERATED_PREFIX) :]
    return " ".join(text.split())


def match_offer(offers: list[CartOffer], supplier_name: str) -> CartOffer | None:
    target = normalize_supplier(supplier_name)
    if not target:
        return None
    matched = [
        offer
        for offer in offers
        if normalize_supplier(offer.vendor_raw) == target
        or normalize_supplier(offer.vendor_norm) == target
    ]
    if not matched:
        return None
    return min(matched, key=_offer_rank)


def middle_pack(offer: CartOffer) -> int | None:
    raw = offer.extra.get("raw") if isinstance(offer.extra.get("raw"), dict) else offer.extra
    if not isinstance(raw, dict):
        return None
    for key in PACK_KEYS:
        value = _positive_int(raw.get(key))
        if value is not None:
            return value
    return None


def qty_fits_pack(qty: int, pack: int | None) -> bool:
    if pack is None or pack <= 1:
        return True
    return qty % pack == 0


def _offer_rank(offer: CartOffer) -> tuple[int, float, float]:
    price = offer.price
    stock = offer.stock
    return (
        0 if price is not None else 1,
        float(price) if price is not None else 0.0,
        -float(stock) if stock is not None else 0.0,
    )


def _positive_int(value: object) -> int | None:
    if value is None or value == "":
        return None
    try:
        number = int(float(str(value)))
    except (TypeError, ValueError):
        return None
    if number <= 0:
        return None
    return number