"""适配器注册表与工厂

通过 @register("sdk-type") 装饰器将适配器类登记到注册表，
上层按 Provider.sdk_type 取得对应适配器实例。
"""

from typing import Optional

from app.adapters.base import BaseAdapter

_REGISTRY: dict = {}


def register(*sdk_types: str):
    """装饰器：将适配器类注册到一个或多个 sdk_type"""

    def decorator(cls):
        for t in sdk_types:
            _REGISTRY[t] = cls
        cls.sdk_types = list(sdk_types)
        return cls

    return decorator


def load_all() -> None:
    """导入所有适配器模块以触发注册（幂等）"""
    from app.adapters import (  # noqa: F401
        ai,
        aliyun,
        cloudflare,
        digitalocean,
        tencent,
        vultr,
    )


def get_adapter(sdk_type: str, config: Optional[dict] = None) -> BaseAdapter:
    """按 sdk_type 创建适配器实例"""
    load_all()
    cls = _REGISTRY.get(sdk_type)
    if not cls:
        raise ValueError(f"未支持的 SDK 类型：{sdk_type}")
    return cls(config)


def is_supported(sdk_type: Optional[str]) -> bool:
    load_all()
    return sdk_type in _REGISTRY


def supported_types() -> list:
    load_all()
    return sorted(_REGISTRY.keys())


def sdk_capabilities() -> dict:
    """返回 sdk_type -> capabilities 映射（供前端判断测试/同步按钮）"""
    load_all()
    result = {}
    for sdk_type, cls in _REGISTRY.items():
        try:
            result[sdk_type] = cls({}).capabilities()
        except Exception:  # noqa: BLE001
            result[sdk_type] = {}
    return result


def adapter_meta() -> list:
    """返回所有已注册适配器的元信息（供前端展示所需凭证字段与能力）"""
    load_all()
    seen = set()
    result = []
    for sdk_type, cls in sorted(_REGISTRY.items()):
        if cls.__name__ in seen:
            continue
        seen.add(cls.__name__)
        result.append(
            {
                "class": cls.__name__,
                "sdk_types": getattr(cls, "sdk_types", [sdk_type]),
                "required_config": getattr(cls, "required_config", []),
            }
        )
    return result