using System.Numerics;
using AcDream.App.UI;

namespace AcDream.App.Tests.UI;

public class UiRootInputTests
{
    [Fact]
    public void WantsMouse_TrueOverWidget_FalseOverEmptySpace()
    {
        var root = new UiRoot { Width = 800, Height = 600 };
        var panel = new UiPanel { Left = 10, Top = 10, Width = 100, Height = 50 };
        root.AddChild(panel);

        root.OnMouseMove(50, 30);    // inside the panel
        Assert.True(root.WantsMouse);

        root.OnMouseMove(500, 400);  // empty space
        Assert.False(root.WantsMouse);
    }

    [Fact]
    public void WindowDrag_RepositionsDraggablePanel_StopsOnRelease()
    {
        var root = new UiRoot { Width = 800, Height = 600 };
        var panel = new UiPanel { Left = 10, Top = 10, Width = 100, Height = 50, Draggable = true };
        root.AddChild(panel);

        root.OnMouseDown(UiMouseButton.Left, 20, 20); // grab at (10,10) into the panel
        root.OnMouseMove(120, 90);                     // drag
        Assert.Equal(110f, panel.Left);                // 120 - 10
        Assert.Equal(80f, panel.Top);                  // 90 - 10

        root.OnMouseUp(UiMouseButton.Left, 120, 90);
        root.OnMouseMove(300, 300);                    // released — must not move
        Assert.Equal(110f, panel.Left);
        Assert.Equal(80f, panel.Top);
    }

    [Fact]
    public void NonDraggablePanel_DoesNotMoveOnDrag()
    {
        var root = new UiRoot { Width = 800, Height = 600 };
        var panel = new UiPanel { Left = 10, Top = 10, Width = 100, Height = 50 }; // Draggable defaults false
        root.AddChild(panel);

        root.OnMouseDown(UiMouseButton.Left, 20, 20);
        root.OnMouseMove(120, 90);
        Assert.Equal(10f, panel.Left);
        Assert.Equal(10f, panel.Top);
    }
}