"""Mood line selection from atmosphere snapshot."""
from __future__ import annotations
import json
from pathlib import Path
from typing import Dict, List, Tuple

DEFAULT_TEMPLATES = {
    "cozy": "店里像被一层软光裹住。",
    "bright": "窗边的亮色把花瓣都叫醒了。",
    "quiet": "安静得能听见纸袋轻响。",
    "lively": "空气里有一点点热闹的甜。",
    "nostalgic": "干燥花香像旧信笺。",
    "scent_floral": "花香在柜台边打了个转。",
}

def load_templates(path: Path | None = None) -> Dict[str, str]:
    path = path or Path(__file__).resolve().parents[2] / "content/diary/mood_templates.json"
    if not path.exists():
        return dict(DEFAULT_TEMPLATES)
    data = json.loads(path.read_text(encoding="utf-8"))
    out = dict(DEFAULT_TEMPLATES)
    for row in data.get("templates") or []:
        if row.get("dim") and row.get("text"):
            out[row["dim"]] = row["text"]
    return out

TEMPLATES = load_templates()

def top_dims(snapshot: dict, n=2) -> List[Tuple[str, float]]:
    dims = {k: v for k, v in snapshot.items() if k != "crowding"}
    return sorted(dims.items(), key=lambda kv: kv[1], reverse=True)[:n]

def mood_from_snapshot(snapshot: dict) -> str:
    top = top_dims(snapshot)
    if not top or top[0][1] < 0.2:
        return "今天的店，安安静静。"
    return TEMPLATES.get(top[0][0], "今天的店，安安静静。")
# reseal-product R166