from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
from .core.config import settings
from .api.v1 import api_router
from .core.database import get_db
from .core.init_db import init_default_data
from sqlalchemy.orm import Session


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Handle startup and shutdown events"""
    # Startup
    db: Session = next(get_db())
    try:
        init_default_data(db)
    finally:
        db.close()
    
    yield
    
    # Shutdown (if needed)
    pass


app = FastAPI(
    title=settings.APP_NAME,
    version=settings.APP_VERSION,
    openapi_url=f"{settings.API_V1_PREFIX}/openapi.json",
    lifespan=lifespan
)

# Set up CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.BACKEND_CORS_ORIGINS,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include API router
app.include_router(api_router, prefix=settings.API_V1_PREFIX)


@app.get("/")
async def root():
    return {
        "message": f"Welcome to {settings.APP_NAME}",
        "version": settings.APP_VERSION,
        "docs": "/docs"
    }


@app.get("/health")
async def health_check():
    return {"status": "healthy"}