"""
Infrastructure-level dependencies for FastAPI dependency injection.
"""

from __future__ import annotations

from functools import lru_cache

from cpv3.infrastructure.settings import get_settings
from cpv3.infrastructure.storage.base import StorageBackend, StorageService
from cpv3.infrastructure.storage.local import LocalConfig, LocalStorageBackend
from cpv3.infrastructure.storage.s3 import S3Config, S3StorageBackend


@lru_cache
def _get_storage_service() -> StorageService:
    settings = get_settings()

    backend: StorageBackend
    if settings.storage_backend.upper() == "LOCAL":
        backend = LocalStorageBackend(LocalConfig(root_dir=settings.local_storage_dir))
    else:
        if not settings.s3_access_key or not settings.s3_secret_key:
            raise RuntimeError(
                "S3_ACCESS_KEY and S3_SECRET_KEY are required for S3 storage"
            )

        backend = S3StorageBackend(
            S3Config(
                access_key=settings.s3_access_key,
                secret_key=settings.s3_secret_key,
                bucket_name=settings.s3_bucket_name,
                endpoint_url_internal=settings.s3_endpoint_url_internal,
                endpoint_url_public=settings.s3_endpoint_url_public,
                presign_expires_seconds=settings.s3_presign_expires_seconds,
            )
        )

    return StorageService(backend)


async def get_storage() -> StorageService:
    return _get_storage_service()