from __future__ import annotations

from contextlib import asynccontextmanager

from fastapi import FastAPI, APIRouter
from fastapi.middleware.cors import CORSMiddleware

from src.apis import chat, health
from src.config import get_settings
from src.session import Base, engine
from src.services.blog import load_runtime_blog_index, blog_library_sync_service

settings = get_settings()

api_router = APIRouter()
api_router.include_router(health.router)
api_router.include_router(chat.router, prefix=settings.api_prefix)

@asynccontextmanager
async def lifespan(app: FastAPI):
    Base.metadata.create_all(bind=engine)
    blog_library_sync_service.sync()
    load_runtime_blog_index()
    yield

def create_app() -> FastAPI:
    app = FastAPI(title=settings.app_name, lifespan=lifespan)

    app.add_middleware(
        CORSMiddleware,
        allow_origins=["*"],
        allow_credentials=False,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    app.include_router(api_router)

    return app