using UnitTests;
using Xunit.Abstractions;

namespace Terminal.Gui.ViewMouseTests;

[Trait ("Category", "Input")]
public class MouseTests (ITestOutputHelper output) : TestsAllViews
{
    [Theory]
    [InlineData (false, false, false)]
    [InlineData (true, false, true)]
    [InlineData (true, true, true)]
    public void MouseClick_SetsFocus_If_CanFocus (bool canFocus, bool setFocus, bool expectedHasFocus)
    {
        var superView = new View { CanFocus = true, Height = 1, Width = 15 };
        var focusedView = new View { CanFocus = true, Width = 1, Height = 1 };
        var testView = new View { CanFocus = canFocus, X = 4, Width = 4, Height = 1 };
        superView.Add (focusedView, testView);

        focusedView.SetFocus ();

        Assert.True (superView.HasFocus);
        Assert.True (focusedView.HasFocus);
        Assert.False (testView.HasFocus);

        if (setFocus)
        {
            testView.SetFocus ();
        }

        testView.NewMouseEvent (new () { Position = new (0, 0), Flags = MouseFlags.Button1Clicked });
        Assert.True (superView.HasFocus);
        Assert.Equal (expectedHasFocus, testView.HasFocus);
    }

    [Theory]
    [InlineData (false, false, 1)]
    [InlineData (true, false, 1)]
    [InlineData (true, true, 1)]
    public void MouseClick_Raises_Selecting (bool canFocus, bool setFocus, int expectedSelectingCount)
    {
        var superView = new View { CanFocus = true, Height = 1, Width = 15 };
        var focusedView = new View { CanFocus = true, Width = 1, Height = 1 };
        var testView = new View { CanFocus = canFocus, X = 4, Width = 4, Height = 1 };
        superView.Add (focusedView, testView);

        focusedView.SetFocus ();

        Assert.True (superView.HasFocus);
        Assert.True (focusedView.HasFocus);
        Assert.False (testView.HasFocus);

        if (setFocus)
        {
            testView.SetFocus ();
        }

        var selectingCount = 0;
        testView.Selecting += (sender, args) => selectingCount++;

        testView.NewMouseEvent (new () { Position = new (0, 0), Flags = MouseFlags.Button1Clicked });
        Assert.True (superView.HasFocus);
        Assert.Equal (expectedSelectingCount, selectingCount);
    }

    [Theory]
    [InlineData (MouseFlags.WheeledUp | MouseFlags.ButtonCtrl, MouseFlags.WheeledLeft)]
    [InlineData (MouseFlags.WheeledDown | MouseFlags.ButtonCtrl, MouseFlags.WheeledRight)]
    public void WheeledLeft_WheeledRight (MouseFlags mouseFlags, MouseFlags expectedMouseFlagsFromEvent)
    {
        var mouseFlagsFromEvent = MouseFlags.None;
        var view = new View ();
        view.MouseEvent += (s, e) => mouseFlagsFromEvent = e.Flags;

        view.NewMouseEvent (new () { Flags = mouseFlags });
        Assert.Equal (mouseFlagsFromEvent, expectedMouseFlagsFromEvent);
    }

    [Fact]
    public void NewMouseEvent_Invokes_MouseEvent_Properly ()
    {
        View view = new ()
        {
            Width = 1,
            Height = 1
        };
        var mouseEventInvoked = false;

        view.MouseEvent += (s, e) =>
                           {
                               mouseEventInvoked = true;
                               e.Handled = true;
                           };

        MouseEventArgs me = new ();
        view.NewMouseEvent (me);
        Assert.True (mouseEventInvoked);
        Assert.True (me.Handled);

        view.Dispose ();
    }

    [Theory]
    [MemberData (nameof (AllViewTypes))]
    public void AllViews_NewMouseEvent_Enabled_False_Does_Not_Set_Handled (Type viewType)
    {
        View view = CreateInstanceIfNotGeneric (viewType);

        if (view == null)
        {
            output.WriteLine ($"Ignoring {viewType} - It's a Generic");

            return;
        }

        view.Enabled = false;
        var me = new MouseEventArgs ();
        view.NewMouseEvent (me);
        Assert.False (me.Handled);
        view.Dispose ();
    }

    [Theory]
    [MemberData (nameof (AllViewTypes))]
    public void AllViews_NewMouseEvent_Clicked_Enabled_False_Does_Not_Set_Handled (Type viewType)
    {
        View view = CreateInstanceIfNotGeneric (viewType);

        if (view == null)
        {
            output.WriteLine ($"Ignoring {viewType} - It's a Generic");

            return;
        }

        view.Enabled = false;

        var me = new MouseEventArgs
        {
            Flags = MouseFlags.Button1Clicked
        };
        view.NewMouseEvent (me);
        Assert.False (me.Handled);
        view.Dispose ();
    }
}