using AtomUI.Controls.Primitives;
using Avalonia.Controls;
using Avalonia.Controls.Primitives;
using Avalonia.Threading;
using Avalonia.VisualTree;
using Shouldly;
using Xunit;
using AtomUIMenu = AtomUI.Desktop.Controls.Menu;
using AtomUIMenuItem = AtomUI.Desktop.Controls.MenuItem;
using AtomUIPopup = AtomUI.Desktop.Controls.Popup;
using AtomUIWindow = AtomUI.Desktop.Controls.Window;

namespace AtomUI.Desktop.Controls.Tests.Menu;

public class MenuPinnedOpenTests
{
    static MenuPinnedOpenTests()
    {
        AvaloniaTestApp.EnsureInitialized();
    }

    [Fact]
    public void Popup_Pin_Opens_Menu_Active_Submenu_And_Physical_Popup()
    {
        var parentItem = new AtomUIMenuItem { Header = "File" };
        parentItem.Items.Add(new AtomUIMenuItem { Header = "Open" });
        var menu = new AtomUIMenu
        {
            IsMotionEnabled = false,
            Width           = 320
        };
        menu.Items.Add(parentItem);
        var window = ShowInWindow(menu);

        try
        {
            menu.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();

            var popup = FindPopup(parentItem);
            menu.IsOpen.ShouldBeTrue();
            parentItem.IsSubMenuOpen.ShouldBeTrue();
            popup.IsPopupPinnedOpen.ShouldBeTrue();
            popup.IsOpen.ShouldBeTrue();
        }
        finally
        {
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    [Theory]
    [InlineData(false)]
    [InlineData(true)]
    public void Popup_Pin_Only_Pins_The_Active_Submenu_Chain(bool grouped)
    {
        var parentItem = new AtomUIMenuItem { Header = "File" };
        var firstChild = new AtomUIMenuItem { Header = "Open", IsSubMenuOpen = true };
        firstChild.Items.Add(new AtomUIMenuItem { Header = "Recent" });
        var secondChild = new AtomUIMenuItem { Header = "Edit" };
        secondChild.Items.Add(new AtomUIMenuItem { Header = "Copy" });
        if (grouped)
        {
            parentItem.Items.Add(new MenuItemGroup { Header = "Group", Items = { firstChild, secondChild } });
        }
        else
        {
            parentItem.Items.Add(firstChild);
            parentItem.Items.Add(secondChild);
        }

        var menu = new AtomUIMenu
        {
            IsMotionEnabled = false,
            Width = 320
        };
        menu.Items.Add(parentItem);
        var window = ShowInWindow(menu);

        try
        {
            menu.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();

            firstChild.IsSubMenuOpen.ShouldBeTrue();
            firstChild.IsPopupPinnedOpen.ShouldBeTrue();
            secondChild.IsSubMenuOpen.ShouldBeFalse();
            secondChild.IsPopupPinnedOpen.ShouldBeFalse();

            // Navigation must release the old pin before Avalonia closes siblings.
            for (var i = 0; i < 3; i++)
            {
                secondChild.Open();
                Dispatcher.UIThread.RunJobs();
                firstChild.IsSubMenuOpen.ShouldBeFalse();
                firstChild.IsPopupPinnedOpen.ShouldBeFalse();
                FindPopup(firstChild).IsOpen.ShouldBeFalse();
                secondChild.IsSubMenuOpen.ShouldBeTrue();
                secondChild.IsPopupPinnedOpen.ShouldBeTrue();

                secondChild.Close();
                Dispatcher.UIThread.RunJobs();
                secondChild.IsSubMenuOpen.ShouldBeTrue();
                FindPopup(secondChild).IsOpen.ShouldBeTrue();

                firstChild.Open();
                Dispatcher.UIThread.RunJobs();
                firstChild.IsSubMenuOpen.ShouldBeTrue();
                secondChild.IsSubMenuOpen.ShouldBeFalse();
            }

            menu.IsPopupPinnedOpen = false;
            firstChild.IsPopupPinnedOpen.ShouldBeFalse();
            firstChild.Close();
            Dispatcher.UIThread.RunJobs();
            firstChild.IsSubMenuOpen.ShouldBeFalse();
        }
        finally
        {
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    [Fact]
    public void Popup_Pin_Rejects_Menu_Close_Requests()
    {
        var parentItem = new AtomUIMenuItem { Header = "File" };
        parentItem.Items.Add(new AtomUIMenuItem { Header = "Open" });
        var menu = new AtomUIMenu
        {
            IsMotionEnabled = false,
            Width           = 320
        };
        menu.Items.Add(parentItem);
        var window = ShowInWindow(menu);

        try
        {
            menu.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();
            var popup = FindPopup(parentItem);

            menu.Close();
            Dispatcher.UIThread.RunJobs();

            menu.IsOpen.ShouldBeTrue();
            parentItem.IsSubMenuOpen.ShouldBeTrue();
            popup.IsOpen.ShouldBeTrue();

            menu.CloseImmediately();
            Dispatcher.UIThread.RunJobs();

            menu.IsOpen.ShouldBeTrue();
            parentItem.IsSubMenuOpen.ShouldBeTrue();
            popup.IsOpen.ShouldBeTrue();
        }
        finally
        {
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    [Fact]
    public void Popup_Pin_Rejects_Active_Submenu_Collapse()
    {
        var parentItem = new AtomUIMenuItem { Header = "File" };
        parentItem.Items.Add(new AtomUIMenuItem { Header = "Open" });
        var menu = new AtomUIMenu
        {
            IsMotionEnabled = false,
            Width           = 320
        };
        menu.Items.Add(parentItem);
        var window = ShowInWindow(menu);

        try
        {
            menu.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();

            parentItem.SetCurrentValue(MenuItem.IsSubMenuOpenProperty, false);
            Dispatcher.UIThread.RunJobs();

            parentItem.IsSubMenuOpen.ShouldBeTrue();
            FindPopup(parentItem).IsOpen.ShouldBeTrue();
        }
        finally
        {
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    [Fact]
    public void Popup_Pin_Closes_For_Detach_And_Reopens_After_Reattach()
    {
        var parentItem = new AtomUIMenuItem { Header = "File" };
        parentItem.Items.Add(new AtomUIMenuItem { Header = "Open" });
        var menu = new AtomUIMenu
        {
            IsMotionEnabled = false,
            Width           = 320
        };
        menu.Items.Add(parentItem);
        var window = ShowInWindow(menu);

        try
        {
            menu.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();
            var popup = FindPopup(parentItem);
            var windowContent = window.Content;

            window.Content = null;
            Dispatcher.UIThread.RunJobs();

            menu.IsOpen.ShouldBeFalse();
            parentItem.IsSubMenuOpen.ShouldBeFalse();
            parentItem.IsPopupPinnedOpen.ShouldBeFalse();
            popup.IsPopupPinnedOpen.ShouldBeFalse();
            popup.IsOpen.ShouldBeFalse();

            window.Content = windowContent;
            Dispatcher.UIThread.RunJobs();

            menu.IsOpen.ShouldBeTrue();
            parentItem.IsSubMenuOpen.ShouldBeTrue();
            popup.IsOpen.ShouldBeTrue();
        }
        finally
        {
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    [Fact]
    public void Popup_Unpin_Leaves_Menu_Open_And_Restores_Normal_Close()
    {
        var parentItem = new AtomUIMenuItem { Header = "File" };
        parentItem.Items.Add(new AtomUIMenuItem { Header = "Open" });
        var menu = new AtomUIMenu
        {
            IsMotionEnabled = false,
            Width           = 320
        };
        menu.Items.Add(parentItem);
        var window = ShowInWindow(menu);

        try
        {
            menu.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();
            var popup = FindPopup(parentItem);
            parentItem.Close();
            Dispatcher.UIThread.RunJobs();
            parentItem.IsSubMenuOpen.ShouldBeTrue();
            popup.IsOpen.ShouldBeTrue();

            menu.IsPopupPinnedOpen = false;
            Dispatcher.UIThread.RunJobs();

            menu.IsOpen.ShouldBeTrue();
            parentItem.IsSubMenuOpen.ShouldBeTrue();
            parentItem.IsPopupPinnedOpen.ShouldBeFalse();
            popup.IsPopupPinnedOpen.ShouldBeFalse();
            popup.IsOpen.ShouldBeTrue();

            menu.Close();
            Dispatcher.UIThread.RunJobs();

            menu.IsOpen.ShouldBeFalse();
            parentItem.IsSubMenuOpen.ShouldBeFalse();
            popup.IsOpen.ShouldBeFalse();
        }
        finally
        {
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    [Fact]
    public void Popup_Pin_Releases_Removed_Item_And_Transfers_To_The_Next_Submenu()
    {
        var firstItem = new AtomUIMenuItem { Header = "File" };
        firstItem.Items.Add(new AtomUIMenuItem { Header = "Open" });
        var secondItem = new AtomUIMenuItem { Header = "Edit" };
        secondItem.Items.Add(new AtomUIMenuItem { Header = "Copy" });
        var menu = new AtomUIMenu
        {
            IsMotionEnabled = false,
            Width           = 320
        };
        menu.Items.Add(firstItem);
        menu.Items.Add(secondItem);
        var window = ShowInWindow(menu);

        try
        {
            menu.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();
            var firstPopup = FindPopup(firstItem);
            firstPopup.IsOpen.ShouldBeTrue();

            menu.Items.Remove(firstItem);
            Dispatcher.UIThread.RunJobs();
            window.UpdateLayout();

            firstItem.IsPopupPinnedOpen.ShouldBeFalse();
            firstItem.IsSubMenuOpen.ShouldBeFalse();
            firstPopup.IsPopupPinnedOpen.ShouldBeFalse();
            firstPopup.IsOpen.ShouldBeFalse();
            secondItem.IsPopupPinnedOpen.ShouldBeTrue();
            secondItem.IsSubMenuOpen.ShouldBeTrue();
            FindPopup(secondItem).IsOpen.ShouldBeTrue();
        }
        finally
        {
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    [Fact]
    public void Pinned_Flyout_Preserves_One_Declared_Branch_And_Transfers_Pin_On_Navigation()
    {
        var first = new AtomUIMenuItem { Header = "First", IsSubMenuOpen = true };
        first.Items.Add(new AtomUIMenuItem { Header = "Leaf" });
        var second = new AtomUIMenuItem { Header = "Second" };
        second.Items.Add(new AtomUIMenuItem { Header = "Leaf" });
        var flyout = new MenuFlyout { IsMotionEnabled = false, Items = { first, second } };
        var button = new SplitButton { Content = "Menu", Flyout = flyout, IsMotionEnabled = false };
        var window = ShowInWindow(button);
        try
        {
            button.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();
            window.UpdateLayout();
            Dispatcher.UIThread.RunJobs();
            first.IsPopupPinnedOpen.ShouldBeTrue();
            first.IsSubMenuOpen.ShouldBeTrue();
            second.IsPopupPinnedOpen.ShouldBeFalse();
            second.IsSubMenuOpen.ShouldBeFalse();

            second.Open();
            Dispatcher.UIThread.RunJobs();
            first.IsSubMenuOpen.ShouldBeFalse();
            first.IsPopupPinnedOpen.ShouldBeFalse();
            second.IsSubMenuOpen.ShouldBeTrue();
            second.IsPopupPinnedOpen.ShouldBeTrue();
            flyout.IsOpen.ShouldBeTrue();
        }
        finally
        {
            button.IsPopupPinnedOpen = false;
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    [Fact]
    public void Top_Level_Pinned_Menu_Transfers_Pin_Before_Closing_Previous_Submenu()
    {
        var first = new AtomUIMenuItem { Header = "First", Items = { new AtomUIMenuItem { Header = "Leaf" } } };
        var second = new AtomUIMenuItem { Header = "Second", Items = { new AtomUIMenuItem { Header = "Leaf" } } };
        var menu = new AtomUIMenu { IsMotionEnabled = false, Width = 320, Items = { first, second } };
        var window = ShowInWindow(menu);
        try
        {
            menu.IsPopupPinnedOpen = true;
            Dispatcher.UIThread.RunJobs();
            second.Open();
            Dispatcher.UIThread.RunJobs();
            first.IsSubMenuOpen.ShouldBeFalse();
            first.IsPopupPinnedOpen.ShouldBeFalse();
            second.IsSubMenuOpen.ShouldBeTrue();
            second.IsPopupPinnedOpen.ShouldBeTrue();
        }
        finally
        {
            menu.IsPopupPinnedOpen = false;
            window.Close();
            Dispatcher.UIThread.RunJobs();
        }
    }

    private static AtomUIPopup FindPopup(Control root)
    {
        return root.GetVisualDescendants()
                   .OfType<AtomUIPopup>()
                   .Single(item => item.Name == "PART_Popup");
    }

    private static AtomUIWindow ShowInWindow(Control content)
    {
        var overlayPanel = new ScopeAwareOverlayLayerPanel
        {
            Width  = 420,
            Height = 240
        };
        overlayPanel.Children.Add(content);
        var visualLayerManager = new VisualLayerManager
        {
            Child = overlayPanel
        };
        var window = new AtomUIWindow
        {
            Width   = 420,
            Height  = 240,
            Content = visualLayerManager
        };
        window.Show();
        Dispatcher.UIThread.RunJobs();
        return window;
    }
}