Program.cs

using GeneralUpdate.Core;
using GeneralUpdate.Core.Configuration;
using GeneralUpdate.Core.Download;
using GeneralUpdate.Core.Download.Reporting;
using GeneralUpdate.Core.Event;
using GeneralUpdate.Core.Hooks;

try
{
    Console.WriteLine("=== GeneralUpdate Client Test ===");
    Console.WriteLine($"Started at {DateTime.Now}");
    Console.WriteLine($"Running from: {AppDomain.CurrentDomain.BaseDirectory}");

    // Secrets come from code — never from files.
    var updateUrl = "http://localhost:5000/Upgrade/Verification";
    var reportUrl = "http://localhost:5000/Upgrade/Report";
    var appSecretKey = Environment.GetEnvironmentVariable("APP_SECRET_KEY") ?? "dfeb5833-975e-4afb-88f1-6278ee9aeff6";

    Console.WriteLine($"UpdateUrl: {updateUrl}");
    Console.WriteLine();

    // Identity metadata (MainAppName, ClientVersion, UpdateAppName, UpdatePath, …)
    // is auto-discovered from generalupdate.manifest.json (generated by GeneralUpdate.Tools).
    await new GeneralUpdateBootstrap()
        .SetSource(updateUrl, appSecretKey, reportUrl)
        .Option(UpdateOptions.AppType, AppType.Client)
        .Hooks<ClientTestHooks>()
        .AddListenerMultiDownloadStatistics(OnDownloadStatistics)
        .AddListenerMultiDownloadCompleted(OnDownloadCompleted)
        .AddListenerMultiAllDownloadCompleted(OnAllDownloadCompleted)
        .AddListenerMultiDownloadError(OnDownloadError)
        .AddListenerException(OnException)
        .AddListenerUpdateInfo(OnUpdateInfo)
        .LaunchAsync();

    Console.WriteLine("Client test completed.");
}
catch (Exception ex)
{
    Console.WriteLine($"FATAL: {ex}");
    Environment.Exit(1);
}

static void OnDownloadStatistics(object sender, MultiDownloadStatisticsEventArgs e)
{
    var v = e.Version as VersionInfo;
    Console.WriteLine($"[Download] {v?.Version}: {e.ProgressPercentage}% | {e.Speed} | ETA: {e.Remaining}");
}

static void OnDownloadCompleted(object sender, MultiDownloadCompletedEventArgs e)
{
    var v = e.Version as VersionInfo;
    Console.WriteLine($"[Download] {v?.Version}: {(e.IsCompleted ? "SUCCESS" : "FAILED")}");
}

static void OnAllDownloadCompleted(object sender, MultiAllDownloadCompletedEventArgs e)
{
    Console.WriteLine(e.IsAllDownloadCompleted
        ? "[Download] All downloads completed."
        : $"[Download] Downloads finished with {e.FailedVersions.Count} failure(s).");
}

static void OnDownloadError(object sender, MultiDownloadErrorEventArgs e)
{
    var v = e.Version as VersionInfo;
    Console.WriteLine($"[Download] Error @ {v?.Version}: {e.Exception.Message}");
}

static void OnException(object sender, ExceptionEventArgs e)
{
    Console.WriteLine($"[Error] {e.Exception}");
}

static void OnUpdateInfo(object sender, UpdateInfoEventArgs e)
{
    Console.WriteLine($"[UpdateInfo] Code={e.Info?.Code}, Message={e.Info?.Message}");
    if (e.Info?.Body is { Count: > 0 })
    {
        foreach (var vi in e.Info.Body)
            Console.WriteLine($"  - {vi.Version} ({vi.Name}) [{vi.Size} bytes] {(vi.IsForcibly == true ? "(forced)" : "")}");
    }
    else
    {
        Console.WriteLine("  No updates available.");
    }
}

sealed class ClientTestHooks : IUpdateHooks
{
    public async Task<bool> OnBeforeUpdateAsync(UpdateContext ctx)
    {
        Console.WriteLine($"[Hook] OnBeforeUpdate: {ctx.CurrentVersion} -> {ctx.TargetVersion}");
        return await Task.FromResult(true);
    }

    public async Task OnDownloadCompletedAsync(DownloadContext ctx)
    {
        Console.WriteLine($"[Hook] OnDownloadCompleted: {ctx.AssetName} v{ctx.Version} ({ctx.TotalBytes} bytes, {ctx.Duration}) {(ctx.Success ? "OK" : "FAIL")}");
        await Task.CompletedTask;
    }

    public async Task OnAfterUpdateAsync(UpdateContext ctx)
    {
        Console.WriteLine($"[Hook] OnAfterUpdate: {ctx.CurrentVersion} -> {ctx.TargetVersion}");
        await Task.CompletedTask;
    }

    public async Task OnUpdateErrorAsync(UpdateContext ctx, Exception ex)
    {
        Console.WriteLine($"[Hook] OnUpdateError: {ctx.CurrentVersion} -> {ctx.TargetVersion} | {ex.Message}");
        await Task.CompletedTask;
    }

    public async Task OnBeforeStartAppAsync(UpdateContext ctx)
    {
        Console.WriteLine($"[Hook] OnBeforeStartApp: {ctx.UpdateAppName} @ {ctx.InstallPath}");
        await Task.CompletedTask;
    }
}