"""Platform fetcher registry for data collection."""

from importlib import import_module
from typing import Dict, Iterable, Optional, Type

from .base import PlatformFetcher

_PLATFORM_FETCHERS: Dict[str, Type[PlatformFetcher]] = {}


def register_platform(name: str):
    """Register a platform fetcher class by config/platform name."""
    normalized = name.strip().lower()
    if not normalized:
        raise ValueError("Platform name must not be empty")

    def decorator(cls: Type[PlatformFetcher]) -> Type[PlatformFetcher]:
        _PLATFORM_FETCHERS[normalized] = cls
        return cls

    return decorator


def get_platform_class(name: str) -> Optional[Type[PlatformFetcher]]:
    return _PLATFORM_FETCHERS.get((name or "").strip().lower())


def get_platform_fetcher(name: str) -> Optional[PlatformFetcher]:
    cls = get_platform_class(name)
    return cls() if cls else None


def get_registered_platforms() -> Dict[str, Type[PlatformFetcher]]:
    return dict(_PLATFORM_FETCHERS)


def discover_modules(module_names: Iterable[str]) -> None:
    for module_name in module_names:
        if module_name:
            import_module(module_name)