"""Implements a wrapper around a MinIO client that provides operations on the MinIO store required by the service."""
import os
from typing import Iterable

from minio import Minio

from mini_queue.utils.config import CONFIG
from mini_queue.utils.storage import StorageHandle


def get_minio_client(access_key=None, secret_key=None) -> Minio:
    """Instantiates a minio.Minio client.

    Args:
        access_key: Access key for MinIO client (username).
        secret_key: Secret key for MinIO client (password).

    Returns:
        A minio.Minio client.
    """
    access_key = CONFIG.minio.user if access_key is None else access_key
    secret_key = CONFIG.minio.password if secret_key is None else secret_key

    # TODO: secure=True/False?
    return Minio(f"{CONFIG.minio.host}:{CONFIG.minio.port}", access_key=access_key, secret_key=secret_key, secure=False)


class MinioHandle(StorageHandle):
    """Wrapper around a MinIO client that provides operations on the MinIO store required by the service."""

    def __init__(self):
        """Initializes a MinioHandle"""
        super().__init__()
        self.client: Minio = get_minio_client()
        self.default_container_name = CONFIG.minio.bucket
        self.backend = "s3"

    def _StorageHandle__provide_container(self, container_name):
        if not self.client.bucket_exists(container_name):
            self.client.make_bucket(container_name)

    def _StorageHandle__add_file(self, path, storage_path, container_name=None):

        if container_name is None:
            container_name = self.default_container_name

        self._StorageHandle__provide_container(container_name)

        with open(path, "rb") as f:
            stat = os.stat(path)
            self.client.put_object(container_name, storage_path, f, stat.st_size)

    def list_files(self, container_name=None) -> Iterable[str]:
        """List all files in a container.

        Args:
            container_name: container to list files from.

        Returns:
            Iterable of filenames.
        """
        return self._list_files("object_name", container_name=container_name)

    def get_objects(self, container_name=None):
        """Gets all objects in a container.

        Args:
            container_name: container to get objects from.

        Returns:
            Iterable over all objects in the container.
        """
        if container_name is None:
            container_name = self.default_container_name
        yield from self.client.list_objects(container_name, recursive=True)

    def _StorageHandle__list_containers(self):
        return self.client.list_buckets()

    def _StorageHandle__purge(self) -> None:
        """Deletes all files and containers in the store."""
        for container, obj in self.get_all_objects():
            self.client.remove_object(container.name, obj.object_name)

        for container in self.client.list_buckets():
            self.client.remove_bucket(container.name)

    def _StorageHandle__fget_object(self, container_name, object_name, target_path):
        self.client.fget_object(container_name, object_name, target_path)

    def _StorageHandle__remove_file(self, folder: str, filename: str, container_name: str = None) -> None:
        """Removes a file from the store.

        Args:
            folder: Folder containing file.
            filename: Name of file (without folder) to remove.
            container_name: container containing file.
        """
        if container_name is None:
            container_name = self.default_container_name

        path = os.path.join(folder, filename)

        if self.client.bucket_exists(container_name):
            self.client.remove_object(container_name, path)