"""适配器注册表 - 支持动态注册和工厂创建。"""

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from app.services.adapters.base import AdapterConfig, BaseAdapter


class AdapterRegistry:
    """适配器注册表，管理所有已注册的适配器类。"""

    _adapters: dict[str, type["BaseAdapter"]] = {}

    @classmethod
    def register(cls, adapter_type: str, adapter_name: str):
        """装饰器：注册适配器类。

        用法:
            @AdapterRegistry.register("text", "text_primary")
            class TextPrimaryAdapter(BaseAdapter[StoryOutput]):
                ...
        """

        def decorator(adapter_class: type["BaseAdapter"]):
            key = f"{adapter_type}:{adapter_name}"
            cls._adapters[key] = adapter_class
            # 自动设置类属性
            adapter_class.adapter_type = adapter_type
            adapter_class.adapter_name = adapter_name
            return adapter_class

        return decorator

    @classmethod
    def get(cls, adapter_type: str, adapter_name: str) -> type["BaseAdapter"] | None:
        """获取已注册的适配器类。"""
        key = f"{adapter_type}:{adapter_name}"
        return cls._adapters.get(key)

    @classmethod
    def list_adapters(cls, adapter_type: str | None = None) -> list[str]:
        """列出所有已注册的适配器。

        Args:
            adapter_type: 可选，筛选特定类型 (text/image/tts)

        Returns:
            适配器键列表，格式为 "type:name"
        """
        if adapter_type:
            return [k for k in cls._adapters if k.startswith(f"{adapter_type}:")]
        return list(cls._adapters.keys())

    @classmethod
    def create(
        cls,
        adapter_type: str,
        adapter_name: str,
        config: "AdapterConfig",
    ) -> "BaseAdapter":
        """工厂方法：创建适配器实例。

        Raises:
            ValueError: 适配器未注册
        """
        adapter_class = cls.get(adapter_type, adapter_name)
        if not adapter_class:
            available = cls.list_adapters(adapter_type)
            raise ValueError(
                f"适配器 '{adapter_type}:{adapter_name}' 未注册。"
                f"可用: {available}"
            )
        return adapter_class(config)