from __future__ import annotations

from typing import List, Dict
import os
import json
from .config import settings


SYNONYM_MAP = {
    # 症状同义
    "胃脘胀": "胀满",
    "胃胀": "胀满",
    "脘闷": "胀满",
    "心窝胀": "胀满",
    "嗳腐": "嗳气",
    "烧心": "反酸",
    # 舌脉
    "舌苔厚腻": "舌苔白腻",
    "苔白腻": "舌苔白腻",
    # 证型/病机关键词
    "肝郁": "肝气郁结",
    "气机不畅": "气滞",
    "食滞": "饮食积滞",
    "痰湿": "痰湿中阻",
    "脾虚": "脾胃虚弱",
    "阳虚": "脾胃虚寒",
}


_external_map: Dict[str, str] | None = None


def _load_external_synonyms() -> Dict[str, str]:
    global _external_map
    if _external_map is not None:
        return _external_map
    path = settings.synonyms_path
    mapping: Dict[str, str] = {}
    if os.path.isfile(path):
        try:
            text = open(path, "r", encoding="utf-8").read()
            # 允许 YAML 或 JSON；无 PyYAML 时做轻量级解析
            if path.endswith(".json") or text.strip().startswith("{"):
                mapping = json.loads(text)
            else:
                # 简易 YAML: 支持 "a: b" 每行一条；忽略注释与空行
                for line in text.splitlines():
                    line = line.strip()
                    if (not line) or line.startswith("#"):
                        continue
                    if ":" in line:
                        k, v = line.split(":", 1)
                        k = k.strip().strip('"\'')
                        v = v.strip().strip('"\'')
                        if k and v:
                            mapping[k] = v
        except Exception:
            mapping = {}
    _external_map = mapping
    return mapping


def normalize_terms(terms: List[str]) -> List[str]:
    normalized: List[str] = []
    external = _load_external_synonyms()
    for t in terms:
        if not t:
            continue
        t2 = t.strip()
        t2 = external.get(t2, SYNONYM_MAP.get(t2, t2))
        if t2 not in normalized:
            normalized.append(t2)
    return normalized