import os
import requests
from pathlib import Path
from config import DEFAULT_API_URL, CACHE_DIR


def fetch_task_file(task_id: str, working_dir: str | None = None) -> str | None:
    """
    Fetch the file associated with a task_id from the API and save it to the working directory.
    
    Args:
        task_id: The task ID to fetch the file for
        working_dir: The working directory to save the file to. If None, uses the global cache directory.
        
    Returns:
        The path to the downloaded file, or None if no file exists or error occurred
    """
    # Use cache directory if working_dir is not provided
    if working_dir is None:
        working_dir = str(CACHE_DIR)

    try:
        files_url = f"{DEFAULT_API_URL}/files/{task_id}"
        response = requests.get(files_url, timeout=30)
        
        if response.status_code == 404:
            # No file associated with this task
            return None
        elif response.status_code == 200:
            # Try to determine filename from content-disposition header
            filename = f"task_{task_id}_file"
            if 'content-disposition' in response.headers:
                content_disp = response.headers['content-disposition']
                if 'filename=' in content_disp:
                    filename = content_disp.split('filename=')[1].strip('"')
            
            # If content type suggests a specific extension
            content_type = response.headers.get('content-type', '')
            if 'json' in content_type and not filename.endswith('.json'):
                filename += '.json'
            elif 'text' in content_type and not filename.endswith('.txt'):
                filename += '.txt'
            elif 'csv' in content_type and not filename.endswith('.csv'):
                filename += '.csv'
            
            # Save file to working directory
            file_path = os.path.join(working_dir, filename)
            with open(file_path, 'wb') as f:
                f.write(response.content)
            
            print(f"Downloaded file for task {task_id}: {file_path}")
            return file_path
        else:
            response.raise_for_status()
            
    except Exception as e:
        print(f"Error fetching file for task {task_id}: {e}")
        return None


def extract_task_id_from_question_data(question_data: dict) -> str | None:
    """
    Extract task_id from question data dictionary.
    
    Args:
        question_data: Dictionary containing question information
        
    Returns:
        The task_id if found, None otherwise
    """
    return question_data.get("task_id")