import boto3
from typing import Optional
from botocore.config import Config
from botocore.exceptions import ClientError
from app.config import settings
from loguru import logger

# Initialize boto3 S3 client for Supabase Storage (S3-compatible)
s3_client = boto3.client(
    "s3",
    endpoint_url=settings.CLOUDFLARE_R2_ENDPOINT_URL,
    aws_access_key_id=settings.CLOUDFLARE_R2_ACCESS_KEY,
    aws_secret_access_key=settings.CLOUDFLARE_R2_SECRET_KEY,
    config=Config(signature_version="s3v4"),
    region_name=settings.CLOUDFLARE_R2_REGION_NAME
)

def upload_file(file_content: bytes, object_key: str, content_type: str = "application/octet-stream") -> bool:
    try:
        s3_client.put_object(
            Bucket=settings.CLOUDFLARE_R2_BUCKET,
            Key=object_key,
            Body=file_content,
            ContentType=content_type
        )
        logger.info(f"Successfully uploaded {object_key} to {settings.CLOUDFLARE_R2_BUCKET}")
        return True
    except ClientError as e:
        logger.error(f"Failed to upload {object_key} to S3: {e}")
        return False

def get_file(object_key: str) -> Optional[bytes]:
    try:
        response = s3_client.get_object(
            Bucket=settings.CLOUDFLARE_R2_BUCKET,
            Key=object_key
        )
        return response["Body"].read()
    except ClientError as e:
        logger.error(f"Failed to download {object_key} from S3: {e}")
        return None

def generate_download_url(object_key: str, expires_in: int = 3600) -> str:
    try:
        url = s3_client.generate_presigned_url(
            "get_object",
            Params={
                "Bucket": settings.CLOUDFLARE_R2_BUCKET,
                "Key": object_key
            },
            ExpiresIn=expires_in
        )
        return url
    except ClientError as e:
        logger.error(f"Failed to generate presigned URL for {object_key}: {e}")
        # Fallback to direct construction if presigned fails
        return f"{settings.CLOUDFLARE_R2_ENDPOINT_URL}/{settings.CLOUDFLARE_R2_BUCKET}/{object_key}"