import json
from pathlib import Path

BASE_DIR = Path(__file__).resolve().parents[3]
MODELS_DIR = BASE_DIR / "models"


class ModelRegistry:
    def __init__(self, registry_path: Path):
        if not registry_path.exists():
            raise FileNotFoundError(f"Registry not found: {registry_path}")

        with open(registry_path, "r", encoding="utf-8") as f:
            self.registry = json.load(f)

        self.base_model_path = Path(self.registry["base_model_path"])
        self.adapters = self.registry["adapters"]

    def get_base_model(self) -> Path:
        return self.base_model_path

    def get_adapter(self, name: str) -> Path:
        if name not in self.adapters:
            raise KeyError(f"Adapter '{name}' not found in registry")
        return Path(self.adapters[name])


REGISTRY = ModelRegistry(
    registry_path=MODELS_DIR / "registry.json"
)