# main.py
import asyncio
from contextlib import asynccontextmanager
from fastapi import FastAPI, BackgroundTasks
from app.api.endpoints.poetry import router as poetry_router
import os
import logging
from typing import Tuple
from starlette.responses import Response
from starlette.staticfiles import StaticFiles
from huggingface_hub import login
from functools import lru_cache
from app.services.poetry_generation import PoetryGenerationService

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Global poetry service instance
poetry_service = None
@lru_cache()
def get_hf_token() -> str:
    """Get Hugging Face token from environment variables."""
    token = os.getenv("HF_TOKEN")
    if not token:
        raise EnvironmentError(
            "HF_TOKEN environment variable not found. "
            "Please set your Hugging Face access token."
        )
    return token

def init_huggingface():
    """Initialize Hugging Face authentication."""
    try:
        token = get_hf_token()
        login(token=token)
        logger.info("Successfully logged in to Hugging Face")
    except Exception as e:
        logger.error(f"Failed to login to Hugging Face: {str(e)}")
        raise
@asynccontextmanager
async def lifespan(app: FastAPI):
    global poetry_service
    
    # Initialize Hugging Face authentication
    init_huggingface()
    
    # Initialize poetry service and preload models
    poetry_service = PoetryGenerationService()
    
    try:
        # Preload models in background
        background_tasks = BackgroundTasks()
        background_tasks.add_task(poetry_service.preload_models)
        
        logger.info("Application startup complete")
        yield
        
    except Exception as e:
        logger.error(f"Error during startup: {str(e)}")
        raise
    finally:
        logger.info("Shutting down application")

app = FastAPI(lifespan=lifespan)
app.include_router(poetry_router, prefix="/api/v1/poetry")

@app.get("/healthz")
async def lifecheck():
    return Response("OK", media_type="text/plain")

if __name__ == "__main__":
    import uvicorn
    
    port = int(os.getenv("PORT", "8000"))
    
    # Configure uvicorn with optimized settings
    uvicorn.run(
        app,
        host="0.0.0.0",
        port=port,
        loop="uvloop",  # Faster event loop implementation
        http="httptools",  # Faster HTTP protocol implementation
    )