"""用户设置的 JSON 存储实现。"""

import json
import os


class JsonSettingsStore:
    """读取与原子写回一个 JSON 对象。

    ``path_getter`` 在每次操作时调用，保证测试或运行时切换用户目录后不会
    意外写到旧目录。
    """

    def __init__(self, path_getter):
        self._path_getter = path_getter

    def load(self):
        path = self._path_getter()
        try:
            if not path.is_file():
                return {}
            data = json.loads(path.read_text("utf-8"))
            return data if isinstance(data, dict) else {}
        except Exception:
            return {}

    def save(self, data):
        path = self._path_getter()
        path.parent.mkdir(parents=True, exist_ok=True)
        temporary_path = path.with_suffix(path.suffix + ".tmp")
        temporary_path.write_text(
            json.dumps(data, ensure_ascii=False, indent=2) + "\n", "utf-8"
        )
        os.replace(temporary_path, path)