zov-tech/backend-py/app/parsers/wb.py

"""Парсер Wildberries — через их JSON API.

Endpoint search.wb.ru отдаёт чистый JSON с товарами. Цены в копейках/u
(делим на 100). У товаров есть rating, feedbacks (отзывы), brand.

Цена /salePriceU/ — итоговая со скидкой, /priceU/ — RRP.
"""
from __future__ import annotations
import logging
from typing import Any
from urllib.parse import quote_plus

import httpx

from .. import proxy_pool

log = logging.getLogger("zov.parser.wb")

_SEARCH_URL = "https://search.wb.ru/exactmatch/ru/common/v9/search"
_DEFAULT_PARAMS = {
    "TestGroup": "no_test",
    "TestID": "no_test",
    "appType": "1",
    "curr": "rub",
    "dest": "-1257786",  # Москва, можно поменять
    "resultset": "catalog",
    "sort": "popular",
    "spp": "30",
    "suppressSpellcheck": "false",
}
_HEADERS = {
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
                  "(KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36",
    "Accept": "*/*",
    "Accept-Language": "ru-RU,ru;q=0.9",
    "Origin": "https://www.wildberries.ru",
    "Referer": "https://www.wildberries.ru/",
}


def search_wb(query: str, limit: int = 3, timeout: float = 12.0,
              max_retries: int = 2) -> list[dict[str, Any]]:
    params = {**_DEFAULT_PARAMS, "query": query}

    for attempt in range(max_retries + 1):
        try:
            with proxy_pool.proxied_client(timeout=timeout, headers=_HEADERS) as client:
                resp = client.get(_SEARCH_URL, params=params)
        except httpx.HTTPError as e:
            log.warning("WB request failed (attempt %d): %s", attempt + 1, e)
            continue

        if resp.status_code == 429:
            log.warning("WB rate-limited on attempt %d, rotating proxy", attempt + 1)
            continue
        if resp.status_code != 200:
            log.warning("WB returned status=%s", resp.status_code)
            continue

        try:
            data = resp.json()
        except Exception as e:
            log.warning("WB JSON parse failed: %s", e)
            continue

        products = (data.get("data") or {}).get("products") or []
        if not products:
            log.info("WB no products for query=%r", query)
            return []

        results: list[dict[str, Any]] = []
        for p in products[:limit]:
            results.append(_build_item(p))
        return results

    log.warning("WB gave up after %d attempts for query=%r", max_retries + 1, query)
    return []


def _build_item(p: dict[str, Any]) -> dict[str, Any]:
    sale_u = p.get("salePriceU") or 0
    price_u = p.get("priceU") or 0
    # WB цена в копейках (или /100). Старое поле было в копейках, иногда в условных единицах.
    # Делим на 100 — стандартный паттерн.
    price_min = (sale_u // 100) if sale_u else (price_u // 100 if price_u else None)
    price_max = (price_u // 100) if price_u and price_u != sale_u else None

    # Если у товара есть варианты sizes — берём минимальную цену оттуда
    sizes = p.get("sizes") or []
    if sizes:
        size_prices = []
        for s in sizes:
            sp = (s.get("price") or {}).get("product") or 0
            if sp:
                size_prices.append(sp // 100)
        if size_prices:
            price_min = min(size_prices)
            if len(size_prices) > 1:
                price_max = max(size_prices)

    pid = p.get("id")
    image_url = _build_image_url(pid) if pid else None

    return {
        "title": p.get("name") or "",
        "url": f"https://www.wildberries.ru/catalog/{pid}/detail.aspx" if pid else "",
        "image_url": image_url,
        "price_min_rub": price_min,
        "price_max_rub": price_max if price_max and price_max != price_min else None,
        "rating": p.get("reviewRating") or p.get("rating"),
        "reviews_count": p.get("feedbacks"),
        "stores_count": None,
        "specs": {
            "brand": p.get("brand", ""),
            "supplier": p.get("supplier", ""),
        },
        "source": "wb",
    }


def _build_image_url(product_id: int) -> str:
    """WB хранит фото на nm-1..20.wbbasket.ru. URL зависит от диапазона id."""
    pid = int(product_id)
    short = pid // 100000
    # Маппинг WB корзин (упрощённый)
    if   pid < 144_000_000: basket = (short // 1431) + 1
    elif pid < 287_000_000: basket = (short // 1431) + 1
    else:                   basket = (short // 1431) + 1
    # Безопасный fallback — basket 10 покрывает почти все ID
    if basket < 1 or basket > 25:
        basket = 10
    bn = str(basket).zfill(2)
    vol = pid // 100000
    part = pid // 1000
    return f"https://basket-{bn}.wbbasket.ru/vol{vol}/part{part}/{pid}/images/big/1.webp"