from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import RedirectResponse
from config.firebase import initialize_firebase
from config.database import client, database
from routers import kittykat_agent_api_router
from kittykat_agent.ask_kittykat.tasklist_service import TasklistDatabaseService
from logger import logger


@asynccontextmanager
async def lifespan_handler(app: FastAPI):
    # Startup — verify connectivity using the same client all routes use
    ping_response = await database.command("ping")
    if int(ping_response["ok"]) != 1:
        raise RuntimeError("Failed to connect to MongoDB cluster")
    logger.info("Connected to MongoDB cluster.")

    initialize_firebase()
    # Ensure task categories exist in database
    db_service = TasklistDatabaseService()
    await db_service.ensure_task_categories_exist()

    yield

    # Shutdown — close the single client
    client.close()
    logger.info("MongoDB client closed. Shutting down.")


app = FastAPI(lifespan=lifespan_handler)

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


@app.get("/", response_class=RedirectResponse, status_code=302)
async def kittkat_api_docs():
    return "/docs"

app.include_router(kittykat_agent_api_router)