from __future__ import annotations

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles

from app import __version__
from app.config import Settings
from app.db import init_db
from app.room import RoomManager
from app.routes_admin import router as admin_router
from app.routes_student import router as student_router


def create_app(settings: Settings | None = None) -> FastAPI:
    settings = settings or Settings.from_env()
    rooms = RoomManager(settings)
    app = FastAPI(title="Live In-Lecture Quiz Portal")
    app.state.settings = settings
    app.state.rooms = rooms

    @app.on_event("startup")
    async def startup() -> None:
        await init_db(settings.db_path)

    @app.get("/healthz")
    async def healthz():
        return {
            "ok": True,
            "version": __version__,
            "sessions_active": await rooms.sessions_active(),
            "ws_clients": rooms.ws_client_count(),
        }

    app.mount("/static", StaticFiles(directory="static"), name="static")
    app.include_router(admin_router(settings, rooms))
    app.include_router(student_router(settings, rooms))
    return app


app = create_app()