import requests
import json

# Constants
SPACE_URL = "https://abanm-dubs.hf.space/api/generate"
API_KEY = "s3cr3t_k3y"  # Replace with your actual API key

def call_api(message):
    """
    Calls the backend API with the user's input using streaming.
    
    Args:
        message (str): User's message.
    
    Returns:
        str: Streamed response from the backend API or an error message.
    """
    headers = {
        "Authorization": f"Bearer {API_KEY}",
        "Content-Type": "application/json",
    }
    payload = {"prompt": message}  # Match the API's expected input key

    try:
        # Send request with streaming enabled
        response = requests.post(SPACE_URL, json=payload, headers=headers, stream=True)
        response.raise_for_status()

        # Aggregate streamed response
        bot_response = ""
        for chunk in response.iter_lines(decode_unicode=True):
            if chunk.strip():  # Ensure the chunk is not empty
                try:
                    # Parse JSON chunk
                    data = json.loads(chunk)
                    if "response" in data:
                        bot_response += data["response"]
                except json.JSONDecodeError:
                    bot_response += "\nError decoding response chunk."
        
        return bot_response.strip() if bot_response else "Error: No response from API."
    except requests.exceptions.Timeout:
        return "Error: The API call timed out."
    except requests.exceptions.RequestException as e:
        return f"Error: {str(e)}"