using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Threading;

namespace Zcbot.WindowsNode.Tests;

public sealed class PresentationCommandTests
{
    [Fact]
    public void MainWindow_BindingsKeepOnlyTheSelectedPageVisible()
    {
        Exception? failure = null;
        var thread = new Thread(() =>
        {
            try
            {
                var application = new System.Windows.Application
                {
                    ShutdownMode = ShutdownMode.OnExplicitShutdown,
                };
                application.Resources.MergedDictionaries.Add(new ResourceDictionary
                {
                    Source = new Uri(
                        "pack://application:,,,/Zcbot.WindowsNode;component/Presentation/Themes/LightTheme.xaml",
                        UriKind.Absolute),
                });
                using var viewModel = CreateViewModel();
                var window = new MainWindow(viewModel);
                window.Measure(new Size(1040, 720));
                window.Arrange(new Rect(0, 0, 1040, 720));
                window.Dispatcher.Invoke(() => { }, DispatcherPriority.DataBind);

                Assert.Equal(Visibility.Visible, FindPage(window, "OverviewPage").Visibility);
                Assert.Equal(Visibility.Collapsed, FindPage(window, "SoftwarePage").Visibility);
                Assert.Equal(Visibility.Collapsed, FindPage(window, "JobsPage").Visibility);
                Assert.Equal(Visibility.Collapsed, FindPage(window, "SettingsPage").Visibility);

                viewModel.ShowJobsCommand.Execute(null);
                window.Dispatcher.Invoke(() => { }, DispatcherPriority.DataBind);

                Assert.Equal(Visibility.Collapsed, FindPage(window, "OverviewPage").Visibility);
                Assert.Equal(Visibility.Collapsed, FindPage(window, "SoftwarePage").Visibility);
                Assert.Equal(Visibility.Visible, FindPage(window, "JobsPage").Visibility);
                Assert.Equal(Visibility.Collapsed, FindPage(window, "SettingsPage").Visibility);
                Assert.Equal(
                    "本机任务",
                    FindElement<TextBlock>(window, "PageTitleText").Text);

                viewModel.ShowSettingsCommand.Execute(null);
                window.Dispatcher.Invoke(() => { }, DispatcherPriority.DataBind);

                Assert.Equal(Visibility.Collapsed, FindPage(window, "OverviewPage").Visibility);
                Assert.Equal(Visibility.Collapsed, FindPage(window, "SoftwarePage").Visibility);
                Assert.Equal(Visibility.Collapsed, FindPage(window, "JobsPage").Visibility);
                Assert.Equal(Visibility.Visible, FindPage(window, "SettingsPage").Visibility);
                Assert.Equal(
                    "运行设置",
                    FindElement<TextBlock>(window, "PageTitleText").Text);
                Assert.Equal(
                    @"C:\node-data",
                    FindElement<TextBox>(window, "DataRootText").Text);
            }
            catch (Exception exception)
            {
                failure = exception;
            }
        });
        thread.SetApartmentState(ApartmentState.STA);
        thread.Start();

        Assert.True(thread.Join(TimeSpan.FromSeconds(5)), "WPF binding smoke test timed out.");
        if (failure is not null) throw failure;
    }

    [Theory]
    [InlineData(typeof(MainWindowViewModel), "PageTitle")]
    [InlineData(typeof(MainWindowViewModel), "StatusText")]
    [InlineData(typeof(MainWindowViewModel), "IsOverviewPage")]
    [InlineData(typeof(MainWindowViewModel), "IsSoftwarePage")]
    [InlineData(typeof(MainWindowViewModel), "IsJobsPage")]
    [InlineData(typeof(MainWindowViewModel), "IsSettingsPage")]
    [InlineData(typeof(MainWindowViewModel), "ShowOverviewCommand")]
    [InlineData(typeof(MainWindowViewModel), "ShowSoftwareCommand")]
    [InlineData(typeof(MainWindowViewModel), "ShowJobsCommand")]
    [InlineData(typeof(MainWindowViewModel), "ShowSettingsCommand")]
    [InlineData(typeof(MainWindowViewModel), "SoftwarePage")]
    [InlineData(typeof(MainWindowViewModel), "JobPage")]
    [InlineData(typeof(MainWindowViewModel), "AcceptancePage")]
    [InlineData(typeof(MainWindowViewModel), "DataRootPage")]
    [InlineData(typeof(MainWindowViewModel), "CopyDiagnosticsCommand")]
    [InlineData(typeof(SoftwarePageViewModel), "Cards")]
    [InlineData(typeof(SoftwarePageViewModel), "Message")]
    [InlineData(typeof(SoftwareCardViewModel), "DisplayName")]
    [InlineData(typeof(SoftwareCardViewModel), "LocationText")]
    [InlineData(typeof(SoftwareCardViewModel), "InstallRuntimeCommand")]
    [InlineData(typeof(JobPageViewModel), "Jobs")]
    [InlineData(typeof(JobPageViewModel), "SelectedJob")]
    [InlineData(typeof(JobPageViewModel), "Summary")]
    [InlineData(typeof(JobPageViewModel), "RefreshCommand")]
    [InlineData(typeof(LocalJobItemViewModel), "StageText")]
    [InlineData(typeof(LocalJobItemViewModel), "DetailText")]
    [InlineData(typeof(AnsysAcceptanceViewModel), "IsAvailable")]
    [InlineData(typeof(AnsysAcceptanceViewModel), "Message")]
    [InlineData(typeof(AnsysAcceptanceViewModel), "RunCommand")]
    [InlineData(typeof(AnsysAcceptanceViewModel), "EnableGateCommand")]
    [InlineData(typeof(DataRootPageViewModel), "CurrentRoot")]
    [InlineData(typeof(DataRootPageViewModel), "Status")]
    [InlineData(typeof(DataRootPageViewModel), "ChangeCommand")]
    [InlineData(typeof(DataRootPageViewModel), "OpenCommand")]
    public void WpfBindingSources_ArePublicProperties(Type type, string propertyName)
    {
        var property = type.GetProperty(propertyName);

        Assert.NotNull(property);
        Assert.True(property!.GetMethod?.IsPublic);
    }

    [Fact]
    public void MainWindowViewModel_MapsStatusAndDisablesExitDuringShutdown()
    {
        var viewModel = CreateViewModel();

        var config = new NodeConfig(
            new Uri("https://zcbot.example/"),
            Guid.NewGuid(),
            Guid.NewGuid(),
            "lab-node",
            "secret",
            30,
            ["origin.plot@v2"]);
        viewModel.ApplyStatus(NodeStatus.Create(NodeState.Online, "已连接"), config);

        Assert.Equal("节点在线", viewModel.StatusText);
        Assert.Equal("success", viewModel.StatusTone);
        Assert.StartsWith("已连接", viewModel.StatusDetail);
        Assert.True(viewModel.IsRegistered);
        Assert.Contains("lab-node", viewModel.IdentityText);
        Assert.True(viewModel.HideCommand.CanExecute(null));
        Assert.True(viewModel.ExitCommand.CanExecute(null));

        viewModel.BeginExit();

        Assert.True(viewModel.IsExiting);
        Assert.Equal("正在退出", viewModel.StatusText);
        Assert.Equal("neutral", viewModel.StatusTone);
        Assert.False(viewModel.HideCommand.CanExecute(null));
        Assert.False(viewModel.ExitCommand.CanExecute(null));
    }

    [Fact]
    public void MainWindowViewModel_ForwardsShellCommands()
    {
        var viewModel = CreateViewModel();
        var copied = false;
        var hidden = false;
        viewModel.ApplyStatus(NodeStatus.Create(NodeState.Online, "online"), CreateConfig());
        viewModel.CopyDiagnosticsRequested += text => copied = text == "diagnostic";
        viewModel.HideRequested += () => hidden = true;

        viewModel.CopyDiagnosticsCommand.Execute(null);
        viewModel.HideCommand.Execute(null);

        Assert.True(copied);
        Assert.True(hidden);
    }

    [Fact]
    public void MainWindowViewModel_NavigatesBetweenMigratedPages()
    {
        var viewModel = CreateViewModel();

        viewModel.ShowSettingsCommand.Execute(null);

        Assert.True(viewModel.IsSettingsPage);
        Assert.Equal("运行设置", viewModel.PageTitle);

        viewModel.ShowJobsCommand.Execute(null);

        Assert.True(viewModel.IsJobsPage);
        Assert.Equal("本机任务", viewModel.PageTitle);

        viewModel.ShowOverviewCommand.Execute(null);

        Assert.True(viewModel.IsOverviewPage);
        Assert.Equal("节点概览", viewModel.PageTitle);
    }

    [Fact]
    public async Task MainWindowViewModel_ValidatesAndForwardsRegistration()
    {
        var viewModel = CreateViewModel();
        var received = new TaskCompletionSource<EnrollOptions>(
            TaskCreationOptions.RunContinuationsAsynchronously);
        viewModel.RegisterRequested += options =>
        {
            received.SetResult(options);
            return Task.CompletedTask;
        };
        viewModel.ServerUrl = "https://zcbot.example/base";
        viewModel.NodeName = "lab-node";
        viewModel.EnrollmentCode = "ZCN-123456789012";

        Assert.True(viewModel.RegisterCommand.CanExecute(null));
        viewModel.RegisterCommand.Execute(null);

        var options = await received.Task.WaitAsync(TimeSpan.FromSeconds(2));
        await WaitUntilAsync(() => !viewModel.IsBusy);
        Assert.Equal("https://zcbot.example/base/", options.ServerUrl.AbsoluteUri);
        Assert.Equal("lab-node", options.NodeName);
        Assert.Equal("ZCN-123456789012", options.EnrollmentCode);
        Assert.Equal("注册成功，正在连接节点", viewModel.OperationMessage);
    }

    [Fact]
    public void MainWindowViewModel_AppliesAndRollsBackStartupSetting()
    {
        var startup = new FakeStartupRegistration();
        var viewModel = CreateViewModel(startup);

        viewModel.IsStartupEnabled = true;

        Assert.True(startup.IsEnabled);
        Assert.True(viewModel.IsStartupEnabled);
        Assert.True(viewModel.HasOperationMessage);

        startup.Failure = new UnauthorizedAccessException("denied");
        viewModel.IsStartupEnabled = false;

        Assert.True(viewModel.IsStartupEnabled);
        Assert.Contains("denied", viewModel.OperationMessage);
    }

    [Fact]
    public async Task AsyncCommand_PreventsReentryAndRestoresAvailability()
    {
        var release = new TaskCompletionSource(
            TaskCreationOptions.RunContinuationsAsynchronously);
        var finished = new TaskCompletionSource(
            TaskCreationOptions.RunContinuationsAsynchronously);
        var callCount = 0;
        var command = new AsyncCommand(async () =>
        {
            callCount++;
            await release.Task;
            finished.SetResult();
        });

        command.Execute(null);
        command.Execute(null);

        Assert.Equal(1, callCount);
        Assert.True(command.IsRunning);
        Assert.False(command.CanExecute(null));

        release.SetResult();
        await finished.Task.WaitAsync(TimeSpan.FromSeconds(2));
        await WaitUntilAsync(() => !command.IsRunning);

        Assert.True(command.CanExecute(null));
    }

    [Fact]
    public async Task AsyncCommand_ReportsExecutionFailure()
    {
        var failure = new InvalidOperationException("failed");
        var reported = new TaskCompletionSource<Exception>(
            TaskCreationOptions.RunContinuationsAsynchronously);
        var command = new AsyncCommand(() => Task.FromException(failure));
        command.Failed += reported.SetResult;

        command.Execute(null);

        Assert.Same(failure, await reported.Task.WaitAsync(TimeSpan.FromSeconds(2)));
        await WaitUntilAsync(() => !command.IsRunning);
        Assert.True(command.CanExecute(null));
    }

    private static async Task WaitUntilAsync(Func<bool> condition)
    {
        var deadline = DateTime.UtcNow.AddSeconds(2);
        while (!condition() && DateTime.UtcNow < deadline)
        {
            await Task.Delay(10);
        }

        Assert.True(condition());
    }

    private static FrameworkElement FindPage(MainWindow window, string name) =>
        FindElement<FrameworkElement>(window, name);

    private static T FindElement<T>(MainWindow window, string name)
        where T : FrameworkElement =>
        Assert.IsAssignableFrom<T>(window.FindName(name));

    private static MainWindowViewModel CreateViewModel(
        FakeStartupRegistration? startup = null) =>
        new(
            startup ?? new FakeStartupRegistration(),
            new FakeDiagnosticService(),
            new SoftwarePageViewModel(new EmptySoftwareManagementService()),
            new JobPageViewModel(new EmptyJobMonitorService()),
            new AnsysAcceptanceViewModel(new EmptyAnsysAcceptanceService()),
            new DataRootPageViewModel(new EmptyDataRootManagementService()));

    private static NodeConfig CreateConfig() => new(
        new Uri("https://zcbot.example/"),
        Guid.NewGuid(),
        Guid.NewGuid(),
        "lab-node",
        "secret",
        30,
        ["origin.plot@v2"]);

    private sealed class FakeStartupRegistration : IStartupRegistration
    {
        internal Exception? Failure { get; set; }

        public bool IsEnabled { get; private set; }

        public void SetEnabled(bool enabled)
        {
            if (Failure is not null) throw Failure;
            IsEnabled = enabled;
        }
    }

    private sealed class FakeDiagnosticService : IDiagnosticService
    {
        public string Build(NodeConfig config) => "diagnostic";
    }

    private sealed class EmptySoftwareManagementService : ISoftwareManagementService
    {
        public Task<IReadOnlyList<SoftwareManagementSnapshot>> RefreshAsync(
            CancellationToken cancellationToken) =>
            Task.FromResult<IReadOnlyList<SoftwareManagementSnapshot>>([]);

        public void SaveLocation(string softwareId, string path) { }

        public void ClearLocation(string softwareId) { }

        public Task<RuntimeInstallResult> InstallRuntimeAsync(
            string softwareId,
            IProgress<string> progress,
            CancellationToken cancellationToken) =>
            throw new NotSupportedException();
    }

    private sealed class EmptyJobMonitorService : IJobMonitorService
    {
        public IReadOnlyList<JobDisplaySnapshot> ReadSnapshots(int limit = 50) => [];
    }

    private sealed class EmptyAnsysAcceptanceService : IAnsysAcceptanceService
    {
        public bool IsAvailable => false;
        public bool IsGateEnabled => false;

        public Task<AdapterAcceptanceResult> RunAsync(
            string workRoot,
            IProgress<string> progress,
            CancellationToken cancellationToken) =>
            throw new NotSupportedException();

        public void EnableGate(string reportPath) => throw new NotSupportedException();
    }

    private sealed class EmptyDataRootManagementService : IDataRootManagementService
    {
        public NodeDataRootSelection ReadSelection() =>
            new(@"C:\node-data", IsEnvironmentManaged: false, "default");

        public bool HasPendingJobs => false;

        public string Normalize(string path) => path;
    }
}