LANCommander/LANCommander.Launcher/UI/Components/KeepAliveContainer.razor

@implements IDisposable
@inject KeepAliveService KeepAliveService
@inject IMessageService MessageService

@code {
    string ConnectionMessageKey = Guid.NewGuid().ToString();

    protected override void OnInitialized()
    {
        KeepAliveService.ConnectionSevered += OnConnectionSevered;
        KeepAliveService.ConnectionRetryNext += OnConnectionRetryNext;
        KeepAliveService.ConnectionLostPermanently += OnConnectionLostPermanently;
        KeepAliveService.ConnectionEstablished += OnConnectionEstablished;
    }

    void OnConnectionSevered(object? sender, EventArgs e)
    {
        var messageConfig = new MessageConfig
        {
            Key = ConnectionMessageKey,
            Type = MessageType.Loading,
            Content = "Lost connection, retrying...",
            Duration = 0,
        };

        MessageService.Open(messageConfig);
    }

    void OnConnectionRetryNext(object? sender, EventArgs e)
    {
        // show same lost-connection-message by replacing the message by its key
        var retry = KeepAliveService.GetRetryCount();
        var messageConfig = new MessageConfig
        {
            Key = ConnectionMessageKey,
            Type = MessageType.Loading,
            Content = $"Lost connection, retrying ({retry.current}/{retry.total}) ...",
            Duration = 0,
        };

        MessageService.Open(messageConfig);
    }
    
    void OnConnectionLostPermanently(object? sender, EventArgs e)
    {
        var messageConfig = new MessageConfig
        {
            Key = ConnectionMessageKey,
            Type = MessageType.Error,
            Content = "Server unavailable, enabling offline mode",
            Duration = 2.5,
        };

        MessageService.Open(messageConfig);
    }
    
    void OnConnectionEstablished(object? sender, EventArgs e)
    {
        var messageConfig = new MessageConfig
        {
            Key = ConnectionMessageKey,
            Type = MessageType.Success,
            Content = "Connection established!",
            Duration = 2.5,
        };

        MessageService.Open(messageConfig);
    }

    public void Dispose()
    {
        KeepAliveService.ConnectionSevered -= OnConnectionSevered;
        KeepAliveService.ConnectionRetryNext -= OnConnectionRetryNext;
        KeepAliveService.ConnectionLostPermanently -= OnConnectionLostPermanently;
        KeepAliveService.ConnectionEstablished -= OnConnectionEstablished;
    }
}