"""Map raw category strings into a unified taxonomy (extend map in JSON)."""

from __future__ import annotations

import json
import re
from pathlib import Path
from typing import Any, Optional


DEFAULT_SYNONYMS: dict[str, str] = {
    "tee": "Top/T-shirt",
    "t-shirt": "Top/T-shirt",
    "tshirt": "Top/T-shirt",
    "short-sleeve top": "Top/T-shirt",
    "trousers": "Bottom/Pants",
    "pants": "Bottom/Pants",
    "slacks": "Bottom/Pants",
    "jeans": "Bottom/Jeans",
    "denim pants": "Bottom/Jeans",
    "outerwear": "Outerwear/Jacket",
    "jacket": "Outerwear/Jacket",
    "blazer": "Outerwear/Jacket",
    "dress": "Dress",
    "gown": "Dress",
    "sweater": "Top/Sweater",
    "skirt": "Bottom/Skirt",
    "shorts": "Bottom/Shorts",
}


def load_taxonomy_map(path: Optional[Path]) -> dict[str, str]:
    base = dict(DEFAULT_SYNONYMS)
    if path is None or not path.is_file():
        return base
    with open(path, encoding="utf-8") as f:
        extra = json.load(f)
    for k, v in extra.items():
        base[str(k).strip().lower()] = str(v).strip()
    return base


def normalize_category(raw: str, mapping: dict[str, str]) -> Optional[str]:
    if not raw or not str(raw).strip():
        return None
    s = str(raw).strip().lower()
    s = re.sub(r"\s+", " ", s)
    if s in mapping:
        return mapping[s]
    for key, val in mapping.items():
        if key in s:
            return val
    return None