import io
import logging
from minio import Minio
from minio.error import S3Error
from app.core.config import settings

logger = logging.getLogger(__name__)

_client: Minio | None = None


def get_client() -> Minio:
    global _client
    if _client is None:
        _client = Minio(
            endpoint=settings.MINIO_ENDPOINT,
            access_key=settings.MINIO_ACCESS_KEY,
            secret_key=settings.MINIO_SECRET_KEY,
            secure=settings.MINIO_USE_SSL,
        )
    return _client


def upload_file(bucket: str, object_name: str, data: bytes, content_type: str = "application/octet-stream") -> str:
    """Upload bytes to MinIO. Returns the object key."""
    client = get_client()
    client.put_object(
        bucket_name=bucket,
        object_name=object_name,
        data=io.BytesIO(data),
        length=len(data),
        content_type=content_type,
    )
    logger.info(f"Uploaded {object_name} to bucket {bucket}")
    return object_name


def get_presigned_url(bucket: str, object_name: str, expires_seconds: int = 3600) -> str:
    """Generate presigned GET URL valid for expires_seconds (default 1h)."""
    from datetime import timedelta
    client = get_client()
    return client.presigned_get_object(bucket, object_name, expires=timedelta(seconds=expires_seconds))


def delete_file(bucket: str, object_name: str) -> None:
    client = get_client()
    client.remove_object(bucket, object_name)
    logger.info(f"Deleted {object_name} from bucket {bucket}")