import boto3
from botocore.client import Config
import uuid
from datetime import datetime
import config


class StorageService:
    def __init__(self):
        self.bucket = config.DO_SPACES_BUCKET
        self.region = config.DO_SPACES_REGION
        
        # Endpoint for boto3 client (region-based)
        self.endpoint_url = f"https://{self.region}.digitaloceanspaces.com"
        
        # Public URL base (bucket-based subdomain)
        self.public_url_base = f"https://{self.bucket}.{self.region}.digitaloceanspaces.com"
        
        self.client = boto3.client(
            's3',
            region_name=self.region,
            endpoint_url=self.endpoint_url,
            aws_access_key_id=config.DO_SPACES_KEY,
            aws_secret_access_key=config.DO_SPACES_SECRET,
            config=Config(signature_version='s3v4')
        )

    def _generate_filename(self, user_id: str, category_id: str, extension: str) -> str:
        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        unique_id = str(uuid.uuid4())[:8]
        return f"{user_id}_{category_id}_{timestamp}_{unique_id}.{extension}"

    def _get_public_url(self, file_path: str) -> str:
        """Generate correct public URL for Digital Ocean Spaces"""
        # Format: https://{bucket}.{region}.digitaloceanspaces.com/{path}
        return f"{self.public_url_base}/{file_path}"

    def upload_source_image(self, file_content: bytes, user_id: str, category_id: str, content_type: str) -> str:
        extension = content_type.split('/')[-1]
        if extension == 'jpeg':
            extension = 'jpg'
        
        filename = self._generate_filename(user_id, category_id, extension)
        file_path = f"{config.SOURCE_PATH}/{filename}"
        
        self.client.put_object(
            Bucket=self.bucket,
            Key=file_path,
            Body=file_content,
            ContentType=content_type,
            ACL='public-read'
        )
        
        return self._get_public_url(file_path)

    def upload_result_video(self, video_content: bytes, user_id: str, category_id: str) -> str:
        filename = self._generate_filename(user_id, category_id, "mp4")
        file_path = f"{config.RESULTS_PATH}/{filename}"
        
        self.client.put_object(
            Bucket=self.bucket,
            Key=file_path,
            Body=video_content,
            ContentType='video/mp4',
            ACL='public-read'
        )
        
        return self._get_public_url(file_path)


storage_service = StorageService()