import json
import sqlite3
from pathlib import Path

from config import USER_DB_PATH


def load_user_profile(user_name: str, db_path: str | Path = USER_DB_PATH) -> str:
    """在 Python 层直接读档案，注入到消息上下文，模型无需主动调用 get_user_profile。"""
    try:
        with sqlite3.connect(db_path) as conn:
            conn.row_factory = sqlite3.Row
            user = conn.execute(
                "SELECT * FROM users WHERE name = ?", (user_name,)
            ).fetchone()
            if not user:
                return f"用户 {user_name} 尚无历史记录，这是第一次见面。"
            prefs = conn.execute(
                "SELECT category, content FROM preferences WHERE user_name = ?",
                (user_name,)
            ).fetchall()
            conn.execute(
                "UPDATE users SET last_seen = datetime('now') WHERE name = ?",
                (user_name,)
            )
            return json.dumps(
                {
                    "基本信息": {
                        "姓名": user["name"],
                        "年龄": user["age"],
                        "上次见面": user["last_seen"],
                    },
                    "偏好习惯": {p["category"]: p["content"] for p in prefs},
                },
                ensure_ascii=False,
            )
    except Exception as e:
        return f"档案读取失败（{e}），当作第一次见面。"