"""FastAPI application entrypoint."""

from fastapi import FastAPI

from app.config import Settings, get_settings
from app.controllers.middleware import install_middleware
from app.controllers.v1.delivery import router as delivery_router
from app.observability import setup_observability


def create_app(settings: Settings | None = None) -> FastAPI:
    resolved_settings = settings or get_settings()

    application = FastAPI(title="G2S Aggregator", version="0.1.0")
    application.state.settings = resolved_settings

    setup_observability(application, resolved_settings.observability)
    install_middleware(application)
    application.include_router(delivery_router, prefix=resolved_settings.controller.api_prefix)
    return application


app = create_app()