using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Threading;
using DodoSSH.Client.App.Views;
using DodoSSH.Client.Session;
using DodoSSH.Client.Session.Tests;
using DodoSSH.Client.Shell.ViewModels;
using DodoSSH.Client.Ssh;
using DodoSSH.Client.Storage;
using DodoSSH.Client.Terminal;
using DodoSSH.Client.Transfer;
using DodoSSH.Crypto;
using NSubstitute;

namespace DodoSSH.Client.App.Layout.Tests;

/// <summary>
/// The keyboard on the cards a closed vault shows: where it is when the card appears, and what Enter does.
/// </summary>
/// <remarks>
/// <para>
/// Launch used to leave the keyboard nowhere. Focus only moved on the way out of an unlocked vault, so the
/// passphrase somebody started typing the moment the window appeared went nowhere until they clicked the box,
/// and Enter in the server address did nothing at all.
/// </para>
/// <para>
/// The whole window, which <see cref="LayoutHarnessTests.WhyTheWindowItselfIsNeverShown"/> says cannot be shown
/// here: the terminal's WebView refuses this thread's apartment when it is attached. It is taken out of the
/// tree before the window is shown, which is everything that test is about and nothing these are.
/// </para>
/// </remarks>
public sealed class ClosedVaultFocusTests
{
    private const string Passphrase = "a sufficiently long passphrase";

    private static readonly Argon2Profile CheapProfile =
        Argon2Profile.FromStoredParameters(memoryKibibytes: 8 * 1024, passes: 1, parallelism: 1);

    private static CancellationToken Token => TestContext.Current.CancellationToken;

    [Fact]
    public async Task AFreshMachine_PutsTheKeyboardInTheServerAddressAndEnterSignsIn()
    {
        using var caches = ClientCacheFactory.ForMemory($"focus-{Guid.CreateVersion7():N}");
        await caches.MigrateAsync(Token);

        await using var workspace = Workspace();
        await using var shell = Shell(caches, workspace);

        await shell.StartAsync(Token);
        shell.State.ShouldBe(ShellState.NeedsServer);

        await LayoutHarness.OnTheUiThreadAsync(
            () => WithWindow(shell, window =>
            {
                var box = window.FindControl<TextBox>("ServerUrlBox").ShouldNotBeNull();

                window.FocusManager!.GetFocusedElement().ShouldBeSameAs(box);

                box.KeyBindings.ShouldContain(binding =>
                    binding.Gesture == new KeyGesture(Key.Enter) && binding.Command == shell.SignInCommand);
            }),
            Token);
    }

    [Fact]
    public async Task AnEnrolledMachine_PutsTheKeyboardInThePassphraseBox()
    {
        using var caches = ClientCacheFactory.ForMemory($"focus-{Guid.CreateVersion7():N}");
        await caches.MigrateAsync(Token);

        await new AccountProvisioner(new FakeAccountServer(), new StubKeyBinding(), caches, TimeProvider.System, CheapProfile)
            .EnrollAsync("https://dodossh.example", Passphrase, "laptop", "Personal", Token);

        await using var workspace = Workspace();
        await using var shell = Shell(caches, workspace);

        await shell.StartAsync(Token);
        shell.State.ShouldBe(ShellState.Locked);

        await LayoutHarness.OnTheUiThreadAsync(
            () => WithWindow(shell, window =>
                window.FocusManager!.GetFocusedElement()
                    .ShouldBeSameAs(window.FindControl<UnlockCard>("UnlockPane").ShouldNotBeNull().PassphraseBox)),
            Token);
    }

    private static TerminalWorkspace Workspace() =>
        new(
            new InMemoryTerminalAssetProvider(new Dictionary<string, TerminalAsset>(StringComparer.Ordinal)),
            Substitute.For<ISshConnectionFactory>(),
            TimeProvider.System);

    private static MainWindowViewModel Shell(ClientCacheFactory caches, TerminalWorkspace workspace) =>
        new(
            new ClientPaths(Path.Combine(Path.GetTempPath(), $"dodossh-focus-{Guid.CreateVersion7():N}")),
            caches,
            workspace,
            new VaultKnownHostStore(),
            new UnavailableDeviceKeyStore(),
            static (_, _) => throw new InvalidOperationException("A layout test has no network."),
            TimeProvider.System,
            Substitute.For<ISftpSessionFactory>(),
            CheapProfile);

    private static void WithWindow(MainWindowViewModel shell, Action<MainWindow> assert)
    {
        var window = new MainWindow { DataContext = shell };

        if (window.FindControl<NativeWebView>("Terminal") is { Parent: Panel panel } web)
        {
            panel.Children.Remove(web);
        }

        try
        {
            LayoutHarness.Settle(window, LayoutHarness.MinimumWidth, LayoutHarness.MinimumHeight);
            Dispatcher.UIThread.RunJobs();

            assert(window);
        }
        finally
        {
            window.Close();
        }
    }
}