@implements IDisposable
@inject ServerStatusMonitor Monitor

@if (Monitor.Current is { } status)
{
    <span class="server-load @LoadClass(status)" title="@Describe(status)" data-testid="server-load">
        <span class="server-load-dot" aria-hidden="true"></span>
        <span class="server-load-count">@status.ActiveConnections/@status.MaxConnections</span>
        <span class="server-load-label">connections</span>
        @if (status.QueuedClients > 0)
        {
            <span class="server-load-queue">· @status.QueuedClients queued</span>
        }
    </span>
}

@code {

    protected override void OnInitialized()
    {
        Monitor.Changed += OnMonitorChanged;
        Monitor.EnsureStarted();
    }

    public void Dispose() => Monitor.Changed -= OnMonitorChanged;

    private void OnMonitorChanged() => _ = InvokeAsync(StateHasChanged);

    private static string LoadClass(ServerStatus status) =>
        status.ActiveConnections >= status.MaxConnections ? "is-full"
        : status.ActiveConnections * 5 >= status.MaxConnections * 4 ? "is-high"
        : "is-ok";

    private static string Describe(ServerStatus status) =>
        $"{status.ActiveConnections} of {status.MaxConnections} connections in use"
        + (status.QueuedClients > 0 ? $", {status.QueuedClients} waiting in the queue" : null);

}