SteUP_Dotnet/SteUp.Shared/Components/Layout/MainLayout.razor

@using System.Globalization
@using SteUp.Shared.Components.SingleElements
@using SteUp.Shared.Core.Interface.IntegryApi
@using SteUp.Shared.Core.Interface.System.Network
@inherits LayoutComponentBase
@implements IDisposable
@inject INetworkService NetworkService
@inject IIntegryApiService IntegryApiService

<MudThemeProvider Theme="_theme" IsDarkMode="false"/>
<MudPopoverProvider/>
@* NoHeader NON va messo qui: e' il valore predefinito di tutti i dialog e
   sopprimerebbe il titolo dei MudMessageBox, che lo rendono nella testata.
   Le schermate a tutto schermo (form scheda, scelta punto vendita) lo
   chiedono gia' per conto loro nelle DialogOptions. *@
<MudDialogProvider CloseButton="false" BackdropClick="false"/>
<MudSnackbarProvider/>

<ConnectionState IsNetworkAvailable="IsNetworkAvailable" ServicesIsDown="ServicesIsDown" ShowWarning="ShowWarning"/>

<div class="app-shell">
    @Body
</div>

<NavMenu/>

@code {

    //Connection state
    private bool _isNetworkAvailable;
    private bool _servicesIsDown;
    private bool _showWarning;

    private DateTime _lastApiCheck = DateTime.MinValue;
    private const int DelaySeconds = 90;

    private CancellationTokenSource? _cts;

    private bool ServicesIsDown
    {
        get => _servicesIsDown;
        set
        {
            if (_servicesIsDown == value) return;
            _servicesIsDown = value;
            StateHasChanged();
        }
    }

    private bool IsNetworkAvailable
    {
        get => _isNetworkAvailable;
        set
        {
            if (_isNetworkAvailable == value) return;
            _isNetworkAvailable = value;
            StateHasChanged();
        }
    }

    private bool ShowWarning
    {
        get => _showWarning;
        set
        {
            if (_showWarning == value) return;
            _showWarning = value;
            StateHasChanged();
        }
    }

    // La palette resta quella di SteUP. Forma, ritmo e tipografia arrivano dai
    // token CSS (tokens.css), che pilotano anche le variabili di MudBlazor:
    // qui si dichiara solo il minimo che Mud deve conoscere lato C#.
    private readonly MudTheme _theme = new()
    {
        PaletteLight = new PaletteLight
        {
            Primary = "#ec4c41",
            Secondary = "#002339",
            Tertiary = "#dff2ff",
            Success = "#26b050",
            Error = "#e50000",
            Warning = "#b26a00",
            Info = "#1877d8",
            Background = "#e9edf2",
            Surface = "#ffffff",
            TextPrimary = "#000000",
            TextSecondary = "#465563",
            LinesDefault = "#d9e0e8",
            LinesInputs = "#d9e0e8",
            Divider = "#d9e0e8"
        },
        LayoutProperties = new LayoutProperties
        {
            DefaultBorderRadius = "16px"
        }
    };

    protected override void OnInitialized()
    {
        _cts = new CancellationTokenSource();
        _ = CheckConnectionState(_cts.Token);

        var culture = new CultureInfo("it-IT", false);

        CultureInfo.CurrentCulture = culture;
        CultureInfo.CurrentUICulture = culture;
    }

    private Task CheckConnectionState(CancellationToken token)
    {
        return Task.Run(async () =>
        {
            while (!token.IsCancellationRequested)
            {
                var isNetworkAvailable = NetworkService.IsNetworkAvailable();
                var servicesDown = ServicesIsDown;

                if (isNetworkAvailable && (DateTime.UtcNow - _lastApiCheck).TotalSeconds >= DelaySeconds)
                {
                    servicesDown = !await IntegryApiService.SystemOk();
                    _lastApiCheck = DateTime.UtcNow;
                }

                await InvokeAsync(async () =>
                {
                    IsNetworkAvailable = isNetworkAvailable;
                    ServicesIsDown = servicesDown;

                    await Task.Delay(1500, token);
                    ShowWarning = !(IsNetworkAvailable && !ServicesIsDown);
                    NetworkService.ConnectionAvailable = !ShowWarning;
                });

                await Task.Delay(500, token);
            }
        }, token);
    }

    public void Dispose()
    {
        _cts?.Cancel();
        _cts?.Dispose();
    }

}