"""Definition of put function."""
from __future__ import annotations

import os
from io import BytesIO

from minio import Minio


def put(
    client: Minio,
    buffer: BytesIO,
    object_name: str,
) -> None:
    """Put buffer in bucket in MinIO."""
    assert isinstance(client, Minio)
    assert isinstance(buffer, BytesIO)
    assert isinstance(object_name, str)
    bucket_name = os.getenv('MINIO_BUCKET_NAME', default=None)
    assert isinstance(bucket_name, str)
    # prepare for saving
    num_bytes = buffer.tell()
    buffer.seek(0)
    # send data to bucket
    client.put_object(
        bucket_name=bucket_name,
        object_name=object_name,
        length=num_bytes,
        data=buffer,
    )