"""Core dependencies for dependency injection."""

from __future__ import annotations

from typing import Any

from hermes.config.settings import get_settings


class Container:
    """Simple dependency injection container."""

    def __init__(self) -> None:
        self._services: dict[str, Any] = {}
        self._singletons: dict[str, Any] = {}

    def register(self, name: str, service: Any, singleton: bool = False) -> None:
        """Register a service."""
        if singleton:
            self._singletons[name] = service
        else:
            self._services[name] = service

    def resolve(self, name: str) -> Any:
        """Resolve a service by name."""
        if name in self._singletons:
            return self._singletons[name]
        if name in self._services:
            return self._services[name]
        raise KeyError(f"Service '{name}' not registered")

    def has(self, name: str) -> bool:
        """Check if a service is registered."""
        return name in self._services or name in self._singletons

    def clear(self) -> None:
        """Clear all registered services."""
        self._services.clear()
        self._singletons.clear()


_container: Container | None = None


def get_container() -> Container:
    """Get the global container."""
    global _container
    if _container is None:
        _container = Container()
        _container.register("settings", get_settings(), singleton=True)
    return _container


def reset_container() -> None:
    """Reset the global container."""
    global _container
    if _container is not None:
        _container.clear()
    _container = None