from contextlib import asynccontextmanager
from datetime import datetime

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

from app.config import get_settings
from app.database import connect_db, disconnect_db


@asynccontextmanager
async def lifespan(app: FastAPI):
    """서버 시작/종료 이벤트: MongoDB + Redis 연결 관리"""
    await connect_db()
    yield
    await disconnect_db()


def create_app() -> FastAPI:
    settings = get_settings()

    app = FastAPI(
        title="todos2 API",
        description="확장형 할일 관리 애플리케이션 API",
        version="1.0.0",
        lifespan=lifespan,
    )

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

    # 라우터 등록
    from app.routers import todos, categories, tags, search, dashboard, uploads
    app.include_router(todos.router)
    app.include_router(categories.router)
    app.include_router(tags.router)
    app.include_router(search.router)
    app.include_router(dashboard.router)
    app.include_router(uploads.router)

    # 헬스 체크
    @app.get("/health", tags=["health"])
    async def health_check():
        return {"status": "healthy", "timestamp": datetime.now().isoformat()}

    return app


app = create_app()