"""
MinIO Client Utility
S3-compatible storage operations for AOI bundles
"""
import os
from typing import Optional, BinaryIO
import structlog
from minio import Minio
from minio.error import S3Error

from config import settings

logger = structlog.get_logger(__name__)


class MinioClient:
    """
    Client for MinIO S3-compatible storage.

    Used for storing generated AOI bundles and assets.
    """

    def __init__(self):
        self.endpoint = settings.minio_endpoint
        self.access_key = settings.minio_access_key
        self.secret_key = settings.minio_secret_key
        self.bucket = settings.minio_bucket
        self.secure = settings.minio_secure
        self._client: Optional[Minio] = None

    @property
    def client(self) -> Minio:
        """Get or create MinIO client instance."""
        if self._client is None:
            self._client = Minio(
                self.endpoint,
                access_key=self.access_key,
                secret_key=self.secret_key,
                secure=self.secure,
            )
            self._ensure_bucket_exists()
        return self._client

    def _ensure_bucket_exists(self):
        """Create the bucket if it doesn't exist."""
        try:
            if not self._client.bucket_exists(self.bucket):
                self._client.make_bucket(self.bucket)
                logger.info("Created MinIO bucket", bucket=self.bucket)
        except S3Error as e:
            logger.error("Error creating bucket", error=str(e))

    async def upload_file(
        self,
        local_path: str,
        object_name: str,
        content_type: str = "application/octet-stream",
    ) -> Optional[str]:
        """
        Upload a file to MinIO.

        Args:
            local_path: Path to local file
            object_name: Name in MinIO (can include path)
            content_type: MIME type of the file

        Returns:
            Object URL or None on failure
        """
        try:
            self.client.fput_object(
                self.bucket,
                object_name,
                local_path,
                content_type=content_type,
            )
            logger.info("Uploaded file to MinIO", object_name=object_name)
            return f"{self.endpoint}/{self.bucket}/{object_name}"
        except S3Error as e:
            logger.error("Error uploading file", error=str(e))
            return None

    async def upload_bytes(
        self,
        data: bytes,
        object_name: str,
        content_type: str = "application/octet-stream",
    ) -> Optional[str]:
        """
        Upload bytes to MinIO.

        Args:
            data: Bytes to upload
            object_name: Name in MinIO
            content_type: MIME type

        Returns:
            Object URL or None on failure
        """
        from io import BytesIO

        try:
            stream = BytesIO(data)
            self.client.put_object(
                self.bucket,
                object_name,
                stream,
                length=len(data),
                content_type=content_type,
            )
            logger.info("Uploaded bytes to MinIO", object_name=object_name, size=len(data))
            return f"{self.endpoint}/{self.bucket}/{object_name}"
        except S3Error as e:
            logger.error("Error uploading bytes", error=str(e))
            return None

    async def download_file(
        self,
        object_name: str,
        local_path: str,
    ) -> bool:
        """
        Download a file from MinIO.

        Args:
            object_name: Name in MinIO
            local_path: Destination path

        Returns:
            True on success
        """
        try:
            self.client.fget_object(self.bucket, object_name, local_path)
            logger.info("Downloaded file from MinIO", object_name=object_name)
            return True
        except S3Error as e:
            logger.error("Error downloading file", error=str(e))
            return False

    async def get_bytes(self, object_name: str) -> Optional[bytes]:
        """
        Get object content as bytes.

        Args:
            object_name: Name in MinIO

        Returns:
            File content or None
        """
        try:
            response = self.client.get_object(self.bucket, object_name)
            data = response.read()
            response.close()
            response.release_conn()
            return data
        except S3Error as e:
            logger.error("Error getting bytes", error=str(e))
            return None

    async def delete_object(self, object_name: str) -> bool:
        """
        Delete an object from MinIO.

        Args:
            object_name: Name in MinIO

        Returns:
            True on success
        """
        try:
            self.client.remove_object(self.bucket, object_name)
            logger.info("Deleted object from MinIO", object_name=object_name)
            return True
        except S3Error as e:
            logger.error("Error deleting object", error=str(e))
            return False

    async def list_objects(self, prefix: str = "") -> list[str]:
        """
        List objects in the bucket.

        Args:
            prefix: Filter by prefix

        Returns:
            List of object names
        """
        try:
            objects = self.client.list_objects(self.bucket, prefix=prefix)
            return [obj.object_name for obj in objects]
        except S3Error as e:
            logger.error("Error listing objects", error=str(e))
            return []

    async def get_presigned_url(
        self,
        object_name: str,
        expiry_hours: int = 24,
    ) -> Optional[str]:
        """
        Get a presigned URL for downloading an object.

        Args:
            object_name: Name in MinIO
            expiry_hours: URL expiry time in hours

        Returns:
            Presigned URL or None
        """
        from datetime import timedelta

        try:
            url = self.client.presigned_get_object(
                self.bucket,
                object_name,
                expires=timedelta(hours=expiry_hours),
            )
            return url
        except S3Error as e:
            logger.error("Error generating presigned URL", error=str(e))
            return None

    async def object_exists(self, object_name: str) -> bool:
        """Check if an object exists."""
        try:
            self.client.stat_object(self.bucket, object_name)
            return True
        except S3Error:
            return False

    async def get_object_size(self, object_name: str) -> Optional[int]:
        """Get the size of an object in bytes."""
        try:
            stat = self.client.stat_object(self.bucket, object_name)
            return stat.size
        except S3Error:
            return None