"""
Hugging Face Spaces entry point.

This file serves as the main entry point for Hugging Face Spaces deployment.
It imports and exposes the FastAPI app from the ai_med_extract package.
"""

import os
import sys
import logging
import importlib.util

# Configure logging for Hugging Face Spaces
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(levelname)s - %(message)s"
)

# Add the services/ai-service/src directory to the Python path
current_dir = os.path.dirname(os.path.abspath(__file__))
src_dir = os.path.join(current_dir, "services", "ai-service", "src")
if src_dir not in sys.path:
    sys.path.insert(0, src_dir)

# Verify the path is correct
logging.info(f"Added src_dir to Python path: {src_dir}")
logging.info(f"src_dir exists: {os.path.exists(src_dir)}")
if os.path.exists(src_dir):
    logging.info(f"Contents of src_dir: {os.listdir(src_dir)}")
    ai_med_extract_path = os.path.join(src_dir, "ai_med_extract")
    logging.info(f"ai_med_extract_path exists: {os.path.exists(ai_med_extract_path)}")
    if os.path.exists(ai_med_extract_path):
        logging.info(f"Contents of ai_med_extract: {os.listdir(ai_med_extract_path)}")

# Detect and set Hugging Face Spaces environment
# HF Spaces sets SPACE_ID environment variable
if os.getenv("SPACE_ID") or os.getenv("SPACE_AUTHOR_NAME"):
    os.environ.setdefault("HF_SPACES", "true")
    logging.info("Detected Hugging Face Spaces environment")

# Set environment variables for Hugging Face Spaces
os.environ.setdefault("FAST_MODE", "true")
os.environ.setdefault("PRELOAD_SMALL_MODELS", "false")
os.environ.setdefault("PYTORCH_CUDA_ALLOC_CONF", "max_split_size_mb:128")
os.environ.setdefault("TOKENIZERS_PARALLELISM", "false")
os.environ.setdefault("OMP_NUM_THREADS", "1")
os.environ.setdefault("MKL_NUM_THREADS", "1")
# Ensure Redis and Database are disabled on HF Spaces
os.environ.setdefault("REDIS_URL", "")
os.environ.setdefault("DATABASE_URL", "")

# Create a robust app instance with multiple fallback strategies
app = None

# Simplified import strategy with better error handling
try:
    logging.info("Attempting to import from ai_med_extract package...")
    logging.info(f"Python path: {sys.path[:3]}")
    logging.info(f"Current working directory: {os.getcwd()}")
    logging.info(f"Files in current directory: {os.listdir('.')}")
    
    # Direct import approach - simpler and more reliable
    from ai_med_extract.app import create_app, initialize_agents  # type: ignore
    logging.info("Successfully imported create_app and initialize_agents")
    
    # Create the app instance WITHOUT initializing agents yet
    try:
        app = create_app(initialize=False)
        logging.info("App instance created successfully (without agents)")
        logging.info(f"App title: {app.title}")
        logging.info(f"App version: {getattr(app, 'version', 'unknown')}")
    except Exception as e:
        logging.error(f"Failed to create app: {e}")
        import traceback
        logging.error(f"App creation traceback: {traceback.format_exc()}")
        # Create minimal fallback app
        from fastapi import FastAPI
        app = FastAPI(title="Medical AI Service (fallback)")
        
        @app.get("/")
        async def root():
            return {"message": "Medical AI Service - Fallback mode", "error": str(e)}
        
        @app.get("/health")
        async def health():
            return {"status": "degraded", "message": "App creation failed", "error": str(e)}
    
    # Initialize agents with minimal preloading for Hugging Face Spaces
    try:
        logging.info("Initializing agents with preload_small_models=False...")
        initialize_agents(app, preload_small_models=False)
        logging.info("Agents initialized successfully")
        
        # Log all registered routes after initialization
        logging.info("=" * 60)
        logging.info("FINAL REGISTERED ROUTES ON HF SPACES:")
        route_count = 0
        for route in app.routes:
            if hasattr(route, "methods") and hasattr(route, "path"):
                logging.info(f"  {list(route.methods)} {route.path}")
                route_count += 1
        logging.info(f"Total routes registered: {route_count}")
        logging.info("=" * 60)
    except Exception as e:
        logging.error(f"Agent initialization failed: {e}")
        import traceback
        logging.error(f"Agent initialization traceback: {traceback.format_exc()}")
        logging.warning("App will start with basic functionality")
        # Add a basic health endpoint if agents fail
        @app.get("/health/status")
        async def basic_health():
            return {"status": "degraded", "message": "Agents not initialized", "error": str(e)}
        
except Exception as e:
    logging.error(f"Failed to import from ai_med_extract package: {e}")
    import traceback
    logging.error(f"Full traceback: {traceback.format_exc()}")
    
    # Create a minimal FastAPI app as fallback
    logging.info("Creating minimal fallback app...")
    from fastapi import FastAPI
    app = FastAPI(title="Medical AI Service (fallback)")
    
    @app.get("/")
    async def root():
        return {
            "message": "Medical AI Service - Fallback mode", 
            "error": str(e),
            "status": "degraded"
        }
    
    @app.get("/health")
    async def health():
        return {"status": "degraded", "message": "Fallback mode active"}
    
    @app.get("/docs")
    async def docs():
        return {"message": "API documentation not available in fallback mode"}
    
    @app.get("/redoc")
    async def redoc():
        return {"message": "ReDoc not available in fallback mode"}

# Ensure we have an app instance
if app is None:
    logging.error("No app instance created, creating emergency fallback...")
    from fastapi import FastAPI
    app = FastAPI(title="Medical AI Service (emergency fallback)")
    
    @app.get("/")
    async def root():
        return {"message": "Emergency fallback mode", "status": "error"}
    
    @app.get("/health")
    async def health():
        return {"status": "error", "message": "Emergency fallback mode"}
    
    @app.get("/docs")
    async def docs():
        return {"message": "API documentation not available in emergency mode"}
    
    @app.get("/redoc")
    async def redoc():
        return {"message": "ReDoc not available in emergency mode"}

# Export the app for Hugging Face Spaces
__all__ = ["app"]

# Ensure the app is available at module level
if 'app' not in locals():
    logging.error("No app instance created, creating emergency fallback...")
    from fastapi import FastAPI
    app = FastAPI(title="Medical AI Service (emergency fallback)")
    
    @app.get("/")
    async def root():
        return {"message": "Emergency fallback mode", "status": "error"}
    
    @app.get("/health")
    async def health():
        return {"status": "error", "message": "Emergency fallback mode"}