using Microsoft.JSInterop;

namespace Lagerbestand.Components.Shared;

/// <summary>
/// Helper that wires a page's reload method to the browser's
/// <c>visibilitychange</c> event via <c>appInterop.registerVisibilityRefresh</c>.
/// The caller owns the <see cref="DotNetObjectReference"/> passed in.
/// </summary>
public static class VisibilityRefresh
{
    /// <summary>
    /// Registers a .NET callback invoked when the browser tab becomes
    /// visible again after being hidden for at least <paramref name="thresholdSeconds"/>.
    /// </summary>
    public static async Task RegisterAsync<T>(
        IJSRuntime js,
        DotNetObjectReference<T> dotNetRef,
        string methodName,
        int thresholdSeconds = 120) where T : class
    {
        try
        {
            await js.InvokeVoidAsync("appInterop.registerVisibilityRefresh", dotNetRef, methodName, thresholdSeconds);
        }
        catch
        {
            // Circuit may be mid-reconnect — non-fatal.
        }
    }

    /// <summary>
    /// Unregisters the visibility callback. Safe to call multiple times.
    /// </summary>
    public static async Task UnregisterAsync(IJSRuntime js)
    {
        try
        {
            await js.InvokeVoidAsync("appInterop.unregisterVisibilityRefresh");
        }
        catch { /* ignore */ }
    }
}