"""打印机配置管理 — JSON 文件持久化"""
import json
import os
from pathlib import Path

CONFIG_DIR = Path(__file__).resolve().parent.parent.parent / "data"
CONFIG_FILE = CONFIG_DIR / "printer_config.json"

DEFAULT_CONFIG = {
    "label_printer": {
        "ip": "192.168.9.221",
        "port": 9100,
        "enabled": False,
    },
}


class PrintConfigManager:
    """打印机 IP/端口 配置读写"""

    @staticmethod
    def _ensure_file() -> None:
        if not CONFIG_DIR.exists():
            CONFIG_DIR.mkdir(parents=True)
        if not CONFIG_FILE.exists():
            PrintConfigManager.save_config(DEFAULT_CONFIG)

    @staticmethod
    def get_config() -> dict:
        PrintConfigManager._ensure_file()
        with open(CONFIG_FILE, "r", encoding="utf-8") as f:
            return json.load(f)

    @staticmethod
    def save_config(config: dict) -> None:
        if not CONFIG_DIR.exists():
            CONFIG_DIR.mkdir(parents=True)
        with open(CONFIG_FILE, "w", encoding="utf-8") as f:
            json.dump(config, f, indent=2, ensure_ascii=False)

    @staticmethod
    def get_printer(name: str = "label_printer") -> dict:
        config = PrintConfigManager.get_config()
        return config.get(name, DEFAULT_CONFIG.get("label_printer", {}))