@inject IInstallationService InstallationService

@if (_initialized)
{
    @if (!_installed)
    {
        <Installer />
    }
    else
    {
        <CascadingAuthenticationState>
            <CascadingValue Value="@PageState">
                <SiteRouter OnStateChange="@ChangeState" />
            </CascadingValue>
        </CascadingAuthenticationState>
    }
}

@code {
    private bool _initialized;
    private bool _installed;

    private PageState PageState { get; set; }

    protected override async Task OnParametersSetAsync()
    {
        var installation = await InstallationService.IsInstalled();
        _installed = installation.Success;
        _initialized = true;
    }

    private void ChangeState(PageState pageState)
    {
        PageState = pageState;
        StateHasChanged();
    }
}