from __future__ import annotations
import re
from typing import Optional, Tuple

def parse_price(text: str) -> Tuple[Optional[float], Optional[str], str]:
    """
    Return (value, currency, raw) from a price-like string.
    Supports symbols £, €, $; strips thousands commas.
    """
    raw = (text or "").strip()
    m = re.search(r'([£€$])?\s*([0-9][0-9.,]*)', raw)
    if not m:
        return None, None, raw
    sym = m.group(1) or ""
    num = m.group(2).replace(",", "")
    try:
        value = float(num)
    except ValueError:
        return None, None, raw
    currency = {"£": "GBP", "€": "EUR", "$": "USD"}.get(sym, None)
    return value, currency, raw

def parse_case_size(text: str) -> Tuple[Optional[int], Optional[float], Optional[str], str]:
    """
    Parse strings like "6 x 500g", "12x1L", "24 × 330 ml"
    Returns (count, item_qty, item_unit, raw)
    """
    raw = (text or "").strip()
    if not raw:
        return None, None, None, raw
    t = re.sub(r"[×Xx]\s*", " x ", raw)
    m = re.search(r"(\d+)\s*x\s*([0-9]*\.?[0-9]+)\s*([a-zA-Z]+)", t)
    if not m:
        return None, None, None, raw
    count = int(m.group(1))
    try:
        item_qty = float(m.group(2))
    except ValueError:
        item_qty = None
    unit = m.group(3)
    return count, item_qty, unit, raw