gpw_next/GPW.CORE.Shared/Components/Layout/PageModeIndicator.razor

@using GPW.CORE.Services
@using Microsoft.JSInterop
@implements IDisposable
@inject NavigationManager Nav
@inject RouteModeService RouteModeSvc
@inject IJSRuntime JS

<span class="page-mode-indicator" title="@Title">
    @if (displayMode == RouteMode.ServerOnly)
    {
        <span class="text-danger" title="Server">🖥️</span>
    }
    else if (displayMode == RouteMode.ClientOnly)
    {
        @if (!isClientActive)
        {
            <span class="text-warning" title="Client (prerender)">🟡</span>
        }
        else
        {
            <span class="text-success" title="WASM">🟢</span>
        }
    }
    else
    {
        <span class="text-info" title="Hybrid">🔀</span>
    }
</span>

@code {
    private RouteMode displayMode = RouteMode.Hybrid;
    private bool isClientActive;
    private string? Title;
    private IDisposable? _subscription;

    protected override void OnInitialized()
    {
        Nav.LocationChanged += OnLocationChanged;

        // Subscribe passing a callback that marshals to the component dispatcher
        _subscription = RouteModeSvc.Subscribe(() => InvokeAsync(StateHasChanged));

        UpdateForCurrentUri();
    }
    
    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender || true)
        {
            // JS check: se fallisce siamo in prerender
            try
            {
                await JS.InvokeVoidAsync("console.debug", "client active check");
                isClientActive = true;
            }
            catch
            {
                isClientActive = false;
            }
            await InvokeAsync(StateHasChanged);
        }
    }

    private void OnLocationChanged(object? s, Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs e)
    {
        UpdateForCurrentUri();
        // StateHasChanged will be triggered by the subscription callback when SetMode is called,
        // but we also want to update immediately for location changes:
        _ = InvokeAsync(StateHasChanged);
    }

    private void UpdateForCurrentUri()
    {
        var uri = Nav.ToBaseRelativePath(Nav.Uri).Split('?')[0];
        var mode = RouteModeSvc.GetModeFor(uri);
        displayMode = mode ?? RouteMode.Hybrid;
        Title = displayMode switch
        {
            RouteMode.ServerOnly => "Pagina Server Only",
            RouteMode.ClientOnly => "Pagina Client Only",
            _ => "Pagina Hybrid"
        };
    }

    public void Dispose()
    {
        Nav.LocationChanged -= OnLocationChanged;
        _subscription?.Dispose();
    }
}