using Avalonia;
using Avalonia.Controls;
using Avalonia.Headless;
using Avalonia.Media;
using Avalonia.Threading;
using Shouldly;
using Xunit;
using ZB.MOM.WW.LmxOpcUa.Client.UI.Controls;

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

public class DateTimeRangePickerScreenshot
{
    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();
        }
    }

    [Fact]
    public void TextBoxes_ShowValues_WhenSetBeforeLoad()
    {
        EnsureInitialized();

        Dispatcher.UIThread.Invoke(() =>
        {
            var picker = new DateTimeRangePicker
            {
                StartDateTime = new DateTimeOffset(2026, 3, 31, 8, 0, 0, TimeSpan.Zero),
                EndDateTime = new DateTimeOffset(2026, 3, 31, 14, 0, 0, TimeSpan.Zero)
            };

            var window = new Window
            {
                Content = picker,
                Width = 700, Height = 70
            };
            window.Show();
            Dispatcher.UIThread.RunJobs();

            var startInput = picker.FindControl<TextBox>("StartInput");
            var endInput = picker.FindControl<TextBox>("EndInput");

            startInput.ShouldNotBeNull();
            endInput.ShouldNotBeNull();
            startInput!.Text.ShouldBe("2026-03-31 08:00:00");
            endInput!.Text.ShouldBe("2026-03-31 14:00:00");

            window.Close();
        });
    }

    [Fact]
    public void TextBoxes_ShowValues_WhenSetAfterLoad()
    {
        EnsureInitialized();

        Dispatcher.UIThread.Invoke(() =>
        {
            var picker = new DateTimeRangePicker();

            var window = new Window
            {
                Content = picker,
                Width = 700, Height = 70
            };
            window.Show();
            Dispatcher.UIThread.RunJobs();

            // Set values after the control is loaded
            picker.StartDateTime = new DateTimeOffset(2026, 1, 15, 10, 30, 0, TimeSpan.Zero);
            picker.EndDateTime = new DateTimeOffset(2026, 1, 15, 18, 45, 0, TimeSpan.Zero);
            Dispatcher.UIThread.RunJobs();

            var startInput = picker.FindControl<TextBox>("StartInput");
            var endInput = picker.FindControl<TextBox>("EndInput");

            startInput!.Text.ShouldBe("2026-01-15 10:30:00");
            endInput!.Text.ShouldBe("2026-01-15 18:45:00");

            window.Close();
        });
    }

    [Fact]
    public void PresetButtons_SetCorrectRange()
    {
        EnsureInitialized();

        Dispatcher.UIThread.Invoke(() =>
        {
            var picker = new DateTimeRangePicker();

            var window = new Window
            {
                Content = picker,
                Width = 700, Height = 70
            };
            window.Show();
            Dispatcher.UIThread.RunJobs();

            // Click the 1h preset
            var lastHourBtn = picker.FindControl<Button>("LastHourBtn");
            lastHourBtn.ShouldNotBeNull();
            lastHourBtn!.RaiseEvent(new Avalonia.Interactivity.RoutedEventArgs(Button.ClickEvent));
            Dispatcher.UIThread.RunJobs();

            picker.StartDateTime.ShouldNotBeNull();
            picker.EndDateTime.ShouldNotBeNull();

            var span = picker.EndDateTime!.Value - picker.StartDateTime!.Value;
            span.TotalMinutes.ShouldBe(60, 1); // ~1 hour

            // Verify text boxes are populated
            var startInput = picker.FindControl<TextBox>("StartInput");
            var endInput = picker.FindControl<TextBox>("EndInput");
            startInput!.Text.ShouldNotBeNullOrEmpty();
            endInput!.Text.ShouldNotBeNullOrEmpty();

            window.Close();
        });
    }

    [Fact]
    public void Capture_DateTimeRangePicker_Screenshot()
    {
        EnsureInitialized();

        Dispatcher.UIThread.Invoke(() =>
        {
            var picker = new DateTimeRangePicker
            {
                StartDateTime = new DateTimeOffset(2026, 3, 31, 8, 0, 0, TimeSpan.Zero),
                EndDateTime = new DateTimeOffset(2026, 3, 31, 14, 0, 0, TimeSpan.Zero)
            };

            var window = new Window
            {
                Content = new Border { Padding = new Thickness(16), Background = Brushes.White, Child = picker },
                Width = 700, Height = 70, Background = Brushes.White
            };
            window.Show();
            Dispatcher.UIThread.RunJobs();

            var bitmap = window.CaptureRenderedFrame();
            Assert.NotNull(bitmap);

            var outputDir = Path.Combine(
                Path.GetDirectoryName(typeof(DateTimeRangePickerScreenshot).Assembly.Location)!, "screenshots");
            Directory.CreateDirectory(outputDir);
            bitmap!.Save(Path.Combine(outputDir, "datetimerangepicker.png"));

            window.Close();
        });
    }
}