"""Карточки товаров: JSON-LD Product/Offer, og-теги, микроразметка, fallback по цене."""
import json
import re

from .. import net
from ..model import Item, price_of

UA = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/141.0.0.0 Safari/537.36"}
JSONLD = re.compile(r'<script[^>]+type="application/ld\+json"[^>]*>(.*?)</script>', re.S)

RULES = [
    ("title", [r'<meta[^>]+property="og:title"[^>]+content="([^"]+)"', r"<title>(.*?)</title>"]),
    ("price", [r'<meta[^>]+property="product:price:amount"[^>]+content="([^"]+)"',
               r'"price"\s*:\s*"?([0-9][0-9.,]*)"?']),
    ("currency", [r'<meta[^>]+property="product:price:currency"[^>]+content="([^"]+)"',
                  r'"priceCurrency"\s*:\s*"([A-Z]{3})"']),
    ("avail", [r'"availability"\s*:\s*"[^"]*?([A-Za-z]+)"?\s*$']),
]


def available(name="cards"):
    return True, "забирает карточку по URL, ключи не нужны"


def _ld_product(html_text):
    for m in JSONLD.finditer(html_text):
        raw = m.group(1).strip()
        try:
            data = json.loads(raw)
        except Exception:
            continue
        stack = data if isinstance(data, list) else [data]
        while stack:
            node = stack.pop()
            if isinstance(node, dict):
                if node.get("@graph"):
                    stack.extend(node["@graph"])
                t = node.get("@type")
                types = t if isinstance(t, list) else [t]
                if any(str(x).lower() in ("product", "offer") for x in types if x):
                    yield node
                for v in node.values():
                    if isinstance(v, (dict, list)):
                        stack.append(v)
            elif isinstance(node, list):
                stack.extend(node)


def _num(s):
    try:
        return float(str(s).replace(",", ".").replace(" ", ""))
    except Exception:
        return None


def extract_cards(urls, limit=10):
    items = []
    for u in (urls if isinstance(urls, (list, tuple)) else [urls])[:limit]:
        r = net.get(u, headers=UA)
        if r.status != 200:
            continue
        title = ""
        price = cur = ""
        avail = ""
        for prod in _ld_product(r.text):
            offers = prod.get("offers") or {}
            if isinstance(offers, list):
                offers = offers[0] if offers else {}
            price = offers.get("price") or offers.get("lowPrice") or price
            cur = offers.get("priceCurrency") or cur
            avail = (offers.get("availability") or avail)
            title = prod.get("name") or title
            if price:
                break
        for field, pats in RULES:
            for p in pats:
                m = re.search(p, r.text, re.I | re.S)
                if not m:
                    continue
                val = re.sub(r"<[^>]+>", "", m.group(1)).strip()
                if field == "title" and not title:
                    title = val
                elif field == "price" and not price:
                    price = val
                elif field == "currency" and not cur:
                    cur = val
                elif field == "avail" and not avail:
                    avail = val
                break
        text = r.text
        body = re.sub(r"<(script|style)[^>]*>.*?</\1>", " ", text, flags=re.S)
        body = re.sub(r"\s+", " ", re.sub(r"<[^>]+>", " ", body))[:2500]
        pval = _num(price)
        if not pval:
            pval, cur2 = price_of(body)
            cur = cur or (cur2 or "")
        it = Item("cards", "card", url=u, title=title[:300], text=body, source=u.split("/")[2] if "://" in u else "",
                  extra={"availability": avail, "raw_price": price})
        it.price = pval
        it.currency = (cur or "")[:4].upper() or None
        items.append(it)
    return items