LANCommander/LANCommander.Launcher/UI/Components/Authentication/AuthenticationForm.razor

@namespace LANCommander.Launcher.UI
@inject IMessageService MessageService
@inject IConnectionClient ConnectionClient

<Layout Style="background-image: url('/assets/auth-background.jpg'); background-size: cover;">
    <Content Class="authentication-form">
        <div class="authentication-logo">
            <img src="/assets/logo.svg" width="300" />
        </div>

        <div class="authentication-box">
            @if (_stage == AuthenticationStage.SelectServer)
            {
                <ServerSelector OnSelected="ServerSelected" Connecting="_connecting" />
            }
            else if (_stage == AuthenticationStage.Login)
            {
                <LoginForm ServerAddress="@ConnectionClient.GetServerAddress()" OnBack="() => _stage = AuthenticationStage.SelectServer" OnRegister="() => _stage = AuthenticationStage.Register" />
            }
            else if (_stage == AuthenticationStage.Register)
            {
                <RegistrationForm ServerAddress="@ConnectionClient.GetServerAddress()" OnBack="() => _stage = AuthenticationStage.Login" />
            }
        </div>
    </Content>
</Layout>

@code {
    bool _connecting { get; set; } = false;
    AuthenticationStage _stage = AuthenticationStage.None;

    protected override async Task OnInitializedAsync()
    {
        await base.OnInitializedAsync();

        if (ConnectionClient.HasServerAddress())
            _stage = AuthenticationStage.Login;
        else
            _stage = AuthenticationStage.SelectServer;
    }

    async Task ServerSelected(Uri serverAddress)
    {
        try
        {
            _connecting = true;

            await ConnectionClient.UpdateServerAddressAsync(serverAddress);
            
            _stage = AuthenticationStage.Login;
        }
        catch (Exception ex)
        {
            MessageService.Error(ex.Message);
        }
        finally
        {
            _connecting = false;
        }
    }
}