from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from apscheduler.schedulers.background import BackgroundScheduler
from datetime import datetime
import os
from dotenv import load_dotenv
from huggingface_hub import HfApi
import json

# Load environment variables
load_dotenv()

# API configuration
API_HOST = os.getenv("API_HOST", "0.0.0.0")
API_PORT = int(os.getenv("API_PORT", "3002"))

app = FastAPI()

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=[
        "http://localhost:5173",  # Vite dev server
        f"http://localhost:{API_PORT}",  # API port
        "https://huggingface.co",  # HF main domain
        "https://*.hf.space",      # HF Spaces domains
    ],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Cache storage
cache = {
    "data": None,
    "last_updated": None
}

# HF API configuration
HF_TOKEN = os.getenv("HUGGING_FACE_HUB_TOKEN")
REPO_ID = os.getenv("HUGGING_FACE_STORAGE_REPO")
FILE_PATH = os.getenv("HUGGING_FACE_STORAGE_FILE_PATH")
CACHE_DURATION_MINUTES = int(os.getenv("UPDATE_INTERVAL_MINUTES", "15"))  # Get from env or default to 15

# Initialize HF API client
hf_api = HfApi(token=HF_TOKEN)

def fetch_leaderboards():
    """Fetch leaderboards data from Hugging Face"""
    try:
        # Download the JSON file directly
        json_path = hf_api.hf_hub_download(
            repo_id=REPO_ID,
            filename=FILE_PATH,
            repo_type="dataset"
        )
        
        with open(json_path, 'r') as f:
            cache["data"] = json.load(f)
            cache["last_updated"] = datetime.now()
            print(f"Cache updated at {cache['last_updated']}")
            
    except Exception as e:
        print(f"Error fetching data: {str(e)}")
        if not cache["data"]:  # Only raise if we don't have any cached data
            raise HTTPException(status_code=500, detail="Failed to fetch leaderboards data")

# Initialize scheduler
scheduler = BackgroundScheduler()
scheduler.add_job(fetch_leaderboards, 'interval', minutes=CACHE_DURATION_MINUTES)
scheduler.start()

# Initial fetch
fetch_leaderboards()

@app.get("/api/leaderboards")
async def get_leaderboards():
    """Get leaderboards data from cache"""
    if not cache["data"]:
        fetch_leaderboards()
    
    return {
        "data": cache["data"],
        "last_updated": cache["last_updated"].isoformat() if cache["last_updated"] else None
    }

@app.get("/api/health")
async def health_check():
    """Health check endpoint"""
    return {
        "status": "healthy",
        "cache_status": "initialized" if cache["data"] else "empty",
        "last_updated": cache["last_updated"].isoformat() if cache["last_updated"] else None
    }

if __name__ == "__main__":
    import uvicorn
    uvicorn.run("server:app", host=API_HOST, port=API_PORT, reload=True)