import asyncio
from contextlib import asynccontextmanager
from fastapi import FastAPI
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

# Configure logging once at module level
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

@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):
    # Initialize Hugging Face authentication first
    init_huggingface()
    
    # Initialize poetry service and preload models
    poetry_service = PoetryGenerationService()
    
    # Only await if `preload_models` is asynchronous
    if callable(getattr(poetry_service, "preload_models", None)):
        result = poetry_service.preload_models()
        if asyncio.iscoroutine(result):
            await result
        else:
            result()  # Call directly if synchronous

    yield  # Continue to application startup

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")

def get_port() -> int:
    return int(os.getenv("PORT", "8000"))

if __name__ == "__main__":
    import uvicorn
    
    port = get_port()
    app.mount("/static", StaticFiles(directory="static"), name="static")
    
    logger.info(f"Starting FastAPI server on port {port}")
    uvicorn.run(app, host="0.0.0.0", port=port)