from fastapi import FastAPI

from backend.bootstrap.settings import Settings
from backend.http.errors import install_error_handlers
from backend.http.router import api_router


def create_application(settings: Settings | None = None) -> FastAPI:
    runtime = settings or Settings.from_environment()
    application = FastAPI(
        title="小白复盘",
        version="0.1.0",
        docs_url="/api/docs" if runtime.debug else None,
        redoc_url=None,
    )
    application.state.settings = runtime
    install_error_handlers(application)
    application.include_router(api_router, prefix="/api")
    return application