application/use_cases/process_job.py

"""Use case for processing extraction jobs."""
import time
import logging
from typing import Protocol, Any

from domain.value_objects.audio_format import AudioFormat
from domain.value_objects.audio_quality import AudioQuality
from domain.value_objects.file_size import FileSize
from domain.entities.video import Video
from domain.entities.audio import Audio
from infrastructure.services.local_file_processor import LocalFileProcessor

from ..dto.extraction_request import ExtractionRequestDTO

logger = logging.getLogger(__name__)

class JobRepository(Protocol):
    """Protocol for job repository."""
    async def update_status(self, job_id: str, status: str,
                           error: str = None, output_path: str = None,
                           processing_time: float = None) -> Any:
        ...

class FFmpegService(Protocol):
    """Protocol for FFmpeg service."""
    async def extract_audio(self, input_path: str, output_path: str,
                           format: str, quality: str) -> Any:
        ...

class FileRepository(Protocol):
    """Protocol for file repository."""
    async def create_output_path(self, job_id: str, format: str) -> str:
        ...
    async def get_file_size(self, file_path: str) -> int:
        ...
    async def delete_file(self, file_path: str) -> bool:
        ...

class NotificationService(Protocol):
    """Protocol for notification service."""
    async def send_job_completion_notification(self, 
                                             job_id: str, 
                                             status: str,
                                             processing_time: float) -> Any:
        ...

class ProcessJobUseCase:
    """Use case for processing a queued extraction job."""
    
    def __init__(self, file_repository, ffmpeg_service, job_repository, notification_service):
        self.file_repository = file_repository
        self.ffmpeg_service = ffmpeg_service
        self.job_repository = job_repository
        self.notification_service = notification_service
        self.file_processor = LocalFileProcessor(file_repository)
    
    async def execute(self, job_id: str, request: ExtractionRequestDTO):
        """Execute job processing with local file handling."""
        start_time = time.time()
        
        try:
            # Update job status
            await self.job_repository.update_status(job_id, "processing")
            
            # Create output path
            output_key = await self.file_repository.create_output_path(
                job_id, 
                request.output_format
            )
            
            # Process with local files
            await self.file_processor.process_with_ffmpeg(
                input_storage_key=request.video_file_path,
                output_storage_key=output_key,
                ffmpeg_func=self.ffmpeg_service.extract_audio,  # Remove _async
                format=request.output_format,  # Change from output_format to format
                quality=request.quality
            )
            
            # Calculate processing time
            processing_time = time.time() - start_time
            
            # Update job as completed
            await self.job_repository.update_status(
                job_id, 
                "completed", 
                output_path=output_key,
                processing_time=processing_time
            )

            # Send notification if service is available and we have a bearer token
            if self.notification_service:
                # Get job record to retrieve bearer token and external job ID
                job_record = await self.job_repository.get(job_id)
                bearer_token = job_record.bearer_token if job_record else None
                external_job_id = job_record.external_job_id if job_record else None
                
                if bearer_token:
                    await self.notification_service.send_job_completion_notification(
                        job_id=job_id,
                        status="completed",
                        processing_time=processing_time,
                        bearer_token=bearer_token,
                        external_job_id=external_job_id
                    )
                else:
                    logger.debug(f"Skipping N8N notification for job {job_id} - no bearer token available")
            
            # Clear bearer token for security (regardless of notification status)
            await self.job_repository.clear_bearer_token(job_id)
            
            logger.info(f"Job {job_id} completed in {processing_time:.2f} seconds")
            
        except Exception as e:
            processing_time = time.time() - start_time
            logger.error(f"Job {job_id} failed after {processing_time:.2f} seconds: {str(e)}")
            
            await self.job_repository.update_status(
                job_id, 
                "failed", 
                error=str(e),
                processing_time=processing_time
            )
            
            # Send failure notification if service is available and we have a bearer token
            if self.notification_service:
                try:
                    job_record = await self.job_repository.get(job_id)
                    bearer_token = job_record.bearer_token if job_record else None
                    external_job_id = job_record.external_job_id if job_record else None
                    
                    if bearer_token:
                        await self.notification_service.send_job_completion_notification(
                            job_id=job_id,
                            status="failed",
                            processing_time=processing_time,
                            bearer_token=bearer_token,
                            external_job_id=external_job_id
                        )
                    else:
                        logger.debug(f"Skipping N8N failure notification for job {job_id} - no bearer token available")
                    
                except Exception as notify_error:
                    # Don't let notification failures mask the original job failure
                    logger.warning(f"Failed to send failure notification for job {job_id}: {notify_error}")
            
            # Clear bearer token for security (regardless of notification status)
            try:
                await self.job_repository.clear_bearer_token(job_id)
            except Exception:
                logger.warning(f"Failed to clear bearer token for failed job {job_id}")
            
            raise