from typing import Any, Dict, Type

from wechat_ipad.providers.legacy_855 import Legacy855WechatClient
from wechat_ipad.providers.server_864 import Server864WechatClient


class WechatGateway:
    """按 server_type 选择具体 Provider 的薄网关。

    当前策略：
    1. Gateway 只负责选择 Provider，并把调用透传出去；
    2. 不在这里承载协议差异或运行时细节，避免再次形成新的“大中台”；
    3. 不同 provider 内部各自维护自己的运行模型，Gateway 只负责路由，不承载版本差异。
    """

    _PROVIDER_MAP: Dict[str, Type[Legacy855WechatClient | Server864WechatClient]] = {
        "legacy_855": Legacy855WechatClient,
        "855": Legacy855WechatClient,
        "859": Legacy855WechatClient,
        "server_864": Server864WechatClient,
        "864": Server864WechatClient,
    }
    _LOCAL_ATTRS = {"server_type", "provider"}

    def __init__(self, ip: str, port: int, server_type: str = "legacy_855", **kwargs: Any):
        normalized_server_type = str(server_type or "legacy_855").strip().lower()
        provider_cls = self._PROVIDER_MAP.get(normalized_server_type)
        if provider_cls is None:
            raise ValueError(f"不支持的 wechat provider 类型: {server_type}")

        object.__setattr__(self, "server_type", normalized_server_type)
        object.__setattr__(self, "provider", provider_cls(ip=ip, port=port, **kwargs))

    def __getattr__(self, item: str) -> Any:
        """将未显式实现的属性/方法透传给具体 Provider。"""
        return getattr(self.provider, item)

    def __setattr__(self, key: str, value: Any) -> None:
        """将运行期动态属性写入透传给 Provider，保持旧调用面的兼容性。"""
        if key in self._LOCAL_ATTRS or "provider" not in self.__dict__:
            object.__setattr__(self, key, value)
            return
        setattr(self.provider, key, value)