using Avalonia;
using Avalonia.Controls;
using Avalonia.Headless;
using Avalonia.Media;
using Avalonia.Threading;
using Xunit;
using ZB.MOM.WW.LmxOpcUa.Client.UI.Controls;
using ZB.MOM.WW.LmxOpcUa.Client.UI.ViewModels;
using ZB.MOM.WW.LmxOpcUa.Client.UI.Views;
using ZB.MOM.WW.LmxOpcUa.Client.UI.Services;
using ZB.MOM.WW.LmxOpcUa.Client.UI.Tests.Fakes;
using ZB.MOM.WW.LmxOpcUa.Client.Shared.Models;
using BrowseResult = ZB.MOM.WW.LmxOpcUa.Client.Shared.Models.BrowseResult;

namespace ZB.MOM.WW.LmxOpcUa.Client.UI.Tests.Screenshots;

public class DocumentationScreenshots
{
    private static readonly object Lock = new();
    private static bool _initialized;

    private static void EnsureInitialized()
    {
        lock (Lock)
        {
            if (_initialized) return;
            _initialized = true;
            AppBuilder.Configure<ScreenshotTestApp>()
                .UseSkia()
                .UseHeadless(new AvaloniaHeadlessPlatformOptions { UseHeadlessDrawing = false })
                .SetupWithoutStarting();
        }
    }

    private static string OutputDir
    {
        get
        {
            var dir = Path.Combine(
                Path.GetDirectoryName(typeof(DocumentationScreenshots).Assembly.Location)!, "screenshots", "docs");
            Directory.CreateDirectory(dir);
            return dir;
        }
    }

    [Fact]
    public void Capture_ConnectionPanel()
    {
        EnsureInitialized();
        Dispatcher.UIThread.Invoke(() =>
        {
            var vm = CreateConnectedViewModel();
            var panel = new StackPanel
            {
                Spacing = 4,
                Children =
                {
                    new StackPanel
                    {
                        Orientation = Avalonia.Layout.Orientation.Horizontal, Spacing = 8,
                        Children =
                        {
                            new StackPanel { Spacing = 2, Children = { new TextBlock { Text = "Endpoint URL", FontSize = 11, Foreground = Brushes.Gray }, new TextBox { Text = "opc.tcp://localhost:4840/LmxOpcUa", Width = 400 } } },
                            new Button { Content = "Connect", Padding = new Thickness(16, 6) },
                            new Button { Content = "Disconnect", Padding = new Thickness(16, 6) }
                        }
                    }
                }
            };

            var window = new Window
            {
                Content = new Border { Padding = new Thickness(12), Background = new SolidColorBrush(Color.Parse("#F0F0F0")), Child = panel },
                Width = 700, Height = 60, Background = Brushes.White
            };
            window.Show();
            var bitmap = window.CaptureRenderedFrame();
            bitmap?.Save(Path.Combine(OutputDir, "connection-panel.png"));
            window.Close();
        });
    }

    [Fact]
    public void Capture_SubscriptionsTab()
    {
        EnsureInitialized();
        Dispatcher.UIThread.Invoke(() =>
        {
            var service = new FakeOpcUaClientService();
            var dispatcher = new SynchronousUiDispatcher();
            var vm = new SubscriptionsViewModel(service, dispatcher) { IsConnected = true };
            vm.ActiveSubscriptions.Add(new SubscriptionItemViewModel("ns=3;s=DEV.ScanState", 1000) { Value = "True", Status = "0x00000000 (Good)", Timestamp = "2026-03-31T14:30:00Z" });
            vm.ActiveSubscriptions.Add(new SubscriptionItemViewModel("ns=3;s=TestMachine_001.TestHistoryValue", 1000) { Value = "3", Status = "0x00000000 (Good)", Timestamp = "2026-03-31T14:30:01Z" });
            vm.ActiveSubscriptions.Add(new SubscriptionItemViewModel("ns=3;s=DevPlatform.CPULoad", 1000) { Value = "42.5", Status = "0x00000000 (Good)", Timestamp = "2026-03-31T14:30:02Z" });

            var view = new SubscriptionsView { DataContext = vm };
            var window = new Window { Content = view, Width = 750, Height = 250, Background = Brushes.White };
            window.Show();
            Dispatcher.UIThread.RunJobs();
            var bitmap = window.CaptureRenderedFrame();
            bitmap?.Save(Path.Combine(OutputDir, "subscriptions-tab.png"));
            window.Close();
        });
    }

    [Fact]
    public void Capture_AlarmsTab()
    {
        EnsureInitialized();
        Dispatcher.UIThread.Invoke(() =>
        {
            var service = new FakeOpcUaClientService();
            var dispatcher = new SynchronousUiDispatcher();
            var vm = new AlarmsViewModel(service, dispatcher)
            {
                IsConnected = true, IsSubscribed = true, MonitoredNodeIdText = "ns=3;s=TestArea"
            };
            vm.AlarmEvents.Add(new AlarmEventViewModel("TestMachine_001.TestAlarm002", "TestAlarm002", 500, "Test alarm #2", true, true, true, new DateTime(2026, 3, 26, 17, 38, 22)));
            vm.AlarmEvents.Add(new AlarmEventViewModel("TestMachine_001.TestAlarm003", "TestAlarm003", 500, "Test alarm #3", true, true, false, new DateTime(2026, 3, 26, 17, 38, 22)));
            vm.AlarmEvents.Add(new AlarmEventViewModel("TestMachine_001.TestAlarm001", "TestAlarm001", 500, "Alarm cleared", true, false, false, DateTime.MinValue));

            var view = new AlarmsView { DataContext = vm };
            var window = new Window { Content = view, Width = 900, Height = 250, Background = Brushes.White };
            window.Show();
            Dispatcher.UIThread.RunJobs();
            var bitmap = window.CaptureRenderedFrame();
            bitmap?.Save(Path.Combine(OutputDir, "alarms-tab.png"));
            window.Close();
        });
    }

    [Fact]
    public void Capture_HistoryTab()
    {
        EnsureInitialized();
        Dispatcher.UIThread.Invoke(() =>
        {
            var service = new FakeOpcUaClientService();
            var dispatcher = new SynchronousUiDispatcher();
            var vm = new HistoryViewModel(service, dispatcher)
            {
                IsConnected = true,
                SelectedNodeId = "ns=3;s=TestMachine_001.TestHistoryValue",
                StartTime = new DateTimeOffset(2026, 3, 26, 0, 0, 0, TimeSpan.Zero),
                EndTime = new DateTimeOffset(2026, 3, 26, 18, 0, 0, TimeSpan.Zero)
            };
            vm.Results.Add(new HistoryValueViewModel("0", "0x00000000 (Good)", "2026-03-26T04:02:59Z", "2026-03-26T04:02:59Z"));
            vm.Results.Add(new HistoryValueViewModel("7", "0x00000000 (Good)", "2026-03-26T04:22:13Z", "2026-03-26T04:22:13Z"));
            vm.Results.Add(new HistoryValueViewModel("4", "0x00000000 (Good)", "2026-03-26T04:22:16Z", "2026-03-26T04:22:16Z"));
            vm.Results.Add(new HistoryValueViewModel("9", "0x00000000 (Good)", "2026-03-26T05:08:46Z", "2026-03-26T05:08:46Z"));

            var view = new HistoryView { DataContext = vm };
            var window = new Window { Content = view, Width = 800, Height = 350, Background = Brushes.White };
            window.Show();
            Dispatcher.UIThread.RunJobs();
            var bitmap = window.CaptureRenderedFrame();
            bitmap?.Save(Path.Combine(OutputDir, "history-tab.png"));
            window.Close();
        });
    }

    [Fact]
    public void Capture_DateTimeRangePicker()
    {
        EnsureInitialized();
        Dispatcher.UIThread.Invoke(() =>
        {
            var picker = new DateTimeRangePicker
            {
                StartDateTime = new DateTimeOffset(2026, 3, 26, 0, 0, 0, TimeSpan.Zero),
                EndDateTime = new DateTimeOffset(2026, 3, 31, 18, 0, 0, TimeSpan.Zero)
            };
            var window = new Window
            {
                Content = new Border { Padding = new Thickness(12), Background = Brushes.White, Child = picker },
                Width = 650, Height = 65, Background = Brushes.White
            };
            window.Show();
            Dispatcher.UIThread.RunJobs();
            var bitmap = window.CaptureRenderedFrame();
            bitmap?.Save(Path.Combine(OutputDir, "datetimerangepicker.png"));
            window.Close();
        });
    }

    private static MainWindowViewModel CreateConnectedViewModel()
    {
        var service = new FakeOpcUaClientService
        {
            ConnectResult = new ConnectionInfo("opc.tcp://localhost:4840/LmxOpcUa", "LmxOpcUa", "None",
                "http://opcfoundation.org/UA/SecurityPolicy#None", "session-1", "TestSession"),
            BrowseResults = new[] { new BrowseResult("ns=3;s=ZB", "ZB", "Object", true) },
            RedundancyResult = new RedundancyInfo("Warm", 200, new[] { "urn:localhost:LmxOpcUa:instance1" }, "urn:localhost:LmxOpcUa:instance1")
        };
        var factory = new FakeOpcUaClientServiceFactory(service);
        var settings = new FakeSettingsService();
        return new MainWindowViewModel(factory, new SynchronousUiDispatcher(), settings);
    }
}