import os
import time
import requests
import threading
import logging

logger = logging.getLogger(__name__)

SPACE_URL = os.getenv("SPACE_URL", "http://localhost:7860")

def ping_self():
    """Runs in a loop to ping the health endpoint and prevent space sleeping."""
    # Delay initial ping slightly to allow FastAPI server to spin up fully
    time.sleep(15)
    
    while True:
        try:
            url = "http://localhost:7860/health"
            logger.info(f"[KeepAlive] Pinging self at {url}")
            response = requests.get(url, timeout=10)
            if response.status_code == 200:
                logger.info("[KeepAlive] Ping successful")
            else:
                logger.warning(f"[KeepAlive] Ping returned status code {response.status_code}")
        except Exception as e:
            logger.error(f"[KeepAlive] Ping failed: {e}")
            
        # Sleep for 25 minutes (25 * 60 seconds)
        time.sleep(25 * 60)

def start_keep_alive():
    """Starts the background ping daemon thread."""
    thread = threading.Thread(target=ping_self, daemon=True)
    thread.start()
    logger.info("[KeepAlive] Background ping thread started")