from collections.abc import Iterable

from core.base import BaseRenderer


class RendererRegistry:
    def __init__(self, renderers: Iterable[BaseRenderer] | None = None) -> None:
        self._renderers: dict[str, BaseRenderer] = {}

        for renderer in renderers or ():
            self.register(renderer)

    def register(self, renderer: BaseRenderer) -> None:
        self._register_key(renderer.content_type, renderer)
        for alias in renderer.aliases:
            self._register_key(alias, renderer)

    def _register_key(self, key: str, renderer: BaseRenderer) -> None:
        if key in self._renderers:
            registered = self._renderers[key]
            raise ValueError(
                f"Renderer key '{key}' is already registered by {type(registered).__name__}"
            )
        self._renderers[key] = renderer

    def get(self, content_type: str) -> BaseRenderer:
        try:
            return self._renderers[content_type]
        except KeyError as exc:
            raise ValueError(
                f"Renderer for content type '{content_type}' is not registered"
            ) from exc