from fastapi import FastAPI

from ..config import Settings
from ..config import get_settings
from ..mcp import mcp
from .docs_mount import mount_docs_static
from .health import router as health_router


def create_app(settings: Settings | None = None) -> FastAPI:
    runtime_settings = settings if settings is not None else get_settings()
    mcp_app = mcp.http_app(
        path=runtime_settings.mounts.mcp,
        json_response=True,
        stateless_http=True,
        transport="http",
    )
    app = FastAPI(
        debug=runtime_settings.debug,
        docs_url=None,
        redoc_url=None,
        openapi_url=None,
        lifespan=mcp_app.lifespan,
    )
    app.state.settings = runtime_settings

    app.include_router(health_router)
    mount_docs_static(
        app,
        docs_route=runtime_settings.mounts.docs,
        site_dir=runtime_settings.site_dir,
    )
    app.mount("/", mcp_app, name="mcp")
    return app