"""
MinIO client for uploading assets (logos, banners, avatars) to S3-compatible storage.
"""
import os
from datetime import datetime
from uuid import uuid4
from typing import BinaryIO, Optional
from minio import Minio
from minio.error import S3Error
import logging

logger = logging.getLogger(__name__)

# MinIO configuration from environment
MINIO_ENDPOINT = os.getenv("MINIO_ENDPOINT", "http://minio:9000")
MINIO_ACCESS_KEY = os.getenv("MINIO_ROOT_USER", "assets-admin")
MINIO_SECRET_KEY = os.getenv("MINIO_ROOT_PASSWORD", "")
ASSETS_BUCKET = os.getenv("ASSETS_BUCKET", "daarion-assets")
ASSETS_PUBLIC_BASE_URL = os.getenv(
    "ASSETS_PUBLIC_BASE_URL",
    "https://assets.daarion.space/daarion-assets"
)

# Initialize MinIO client
_minio_client: Optional[Minio] = None


def get_minio_client() -> Minio:
    """Get or create MinIO client instance."""
    global _minio_client
    if _minio_client is None:
        # Remove http:// or https:// from endpoint for MinIO client
        endpoint = MINIO_ENDPOINT.replace("http://", "").replace("https://", "")
        secure = MINIO_ENDPOINT.startswith("https://")
        
        _minio_client = Minio(
            endpoint,
            access_key=MINIO_ACCESS_KEY,
            secret_key=MINIO_SECRET_KEY,
            secure=secure,
        )
    return _minio_client


def ensure_bucket():
    """Ensure the assets bucket exists, create if it doesn't."""
    try:
        client = get_minio_client()
        if not client.bucket_exists(ASSETS_BUCKET):
            client.make_bucket(ASSETS_BUCKET)
            logger.info(f"Created bucket: {ASSETS_BUCKET}")
        else:
            logger.debug(f"Bucket {ASSETS_BUCKET} already exists")
    except S3Error as e:
        logger.error(f"Failed to ensure bucket {ASSETS_BUCKET}: {e}")
        raise


def upload_asset(
    file_obj: BinaryIO,
    content_type: str,
    prefix: str,
    filename: Optional[str] = None
) -> str:
    """
    Upload a file to MinIO and return the public URL.
    
    Args:
        file_obj: File-like object to upload
        content_type: MIME type (e.g., 'image/png', 'image/jpeg')
        prefix: Path prefix (e.g., 'microdao/logo', 'agents/avatar')
        filename: Optional original filename (for extension detection)
    
    Returns:
        Full public HTTPS URL to the uploaded asset
    """
    try:
        ensure_bucket()
        client = get_minio_client()
        
        # Generate object key: prefix/YYYY/MM/DD/uuid.ext
        date_path = datetime.utcnow().strftime("%Y/%m/%d")
        unique_id = uuid4().hex
        
        # Try to extract extension from filename or content_type
        ext = ""
        if filename:
            ext = os.path.splitext(filename)[1] or ""
        elif content_type:
            # Map common content types to extensions
            ext_map = {
                "image/png": ".png",
                "image/jpeg": ".jpg",
                "image/jpg": ".jpg",
                "image/webp": ".webp",
                "image/gif": ".gif",
            }
            ext = ext_map.get(content_type, "")
        
        object_key = f"{prefix}/{date_path}/{unique_id}{ext}"
        
        # Get file size (seek to end, get position, reset)
        file_obj.seek(0, 2)  # Seek to end
        file_size = file_obj.tell()
        file_obj.seek(0)  # Reset to beginning
        
        # Upload to MinIO
        client.put_object(
            ASSETS_BUCKET,
            object_key,
            file_obj,
            length=file_size,
            content_type=content_type,
        )
        
        # Return public URL
        public_url = f"{ASSETS_PUBLIC_BASE_URL}/{object_key}"
        logger.info(f"Uploaded asset to {public_url}")
        
        return public_url
        
    except S3Error as e:
        logger.error(f"Failed to upload asset: {e}")
        raise
    except Exception as e:
        logger.error(f"Unexpected error uploading asset: {e}")
        raise


def delete_asset(object_key: str) -> bool:
    """
    Delete an asset from MinIO.
    
    Args:
        object_key: Full object key or URL (will extract key from URL if needed)
    
    Returns:
        True if deleted, False otherwise
    """
    try:
        client = get_minio_client()
        
        # If it's a full URL, extract the object key
        if object_key.startswith("http://") or object_key.startswith("https://"):
            # Extract key from URL like: https://assets.daarion.space/daarion-assets/microdao/logo/...
            parts = object_key.split(f"{ASSETS_PUBLIC_BASE_URL}/")
            if len(parts) < 2:
                logger.warning(f"Could not extract object key from URL: {object_key}")
                return False
            object_key = parts[1]
        
        client.remove_object(ASSETS_BUCKET, object_key)
        logger.info(f"Deleted asset: {object_key}")
        return True
        
    except S3Error as e:
        logger.error(f"Failed to delete asset {object_key}: {e}")
        return False
    except Exception as e:
        logger.error(f"Unexpected error deleting asset: {e}")
        return False