using Annulus;
using Azimuth;
using Prism;

namespace Glass.Testbed.TestCases.Controls
{
    /// <summary>
    /// GroupBoxes with the caption on the baseline, through the middle and above the frame, then one with the frame art
    /// scaled up and one sized to hold a caption wider than its content.
    /// </summary>
    public class GroupBoxTestCase : TestCase
    {
        private static readonly Vector BoxSize = new Vector(220, 110);

        /// <summary>
        /// A solid cell that is a fixed thickness across the axes it is intrinsic on.
        /// </summary>
        public record LineCell : SolidColorMaterial
        {
            public Scalar Thickness { get; init; }

            protected override Vector PreferredSizeInModelSpace(Constraints constraints)
            {
                return new Vector(
                    LayoutSizingX == LayoutSizing.Fill ? constraints.MinSize.X : Thickness,
                    LayoutSizingY == LayoutSizing.Fill ? constraints.MinSize.Y : Thickness);
            }
        }

        private static LineCell Line(Color color, int thickness, bool fillX, bool fillY)
        {
            return new LineCell
            {
                Color = color,
                Thickness = thickness,
                LayoutSizingX = fillX ? LayoutSizing.Fill : LayoutSizing.Intrinsic,
                LayoutSizingY = fillY ? LayoutSizing.Fill : LayoutSizing.Intrinsic,
            };
        }

        private static GroupBoxMaterial ThinFrame(Color line, Material background, int thickness)
        {
            // Nothing is drawn in the center, so the background shows through the line's square corners.
            Material corner = Line(line, thickness, fillX: false, fillY: false);
            Material horizontal = Line(line, thickness, fillX: true, fillY: false);
            Material vertical = Line(line, thickness, fillX: false, fillY: true);
            Material[] cells =
            {
                corner, horizontal, corner,
                vertical, Material.Invisible, vertical,
                corner, horizontal, corner,
            };

            return new GroupBoxMaterial
            {
                Background = background,
                Frame = new NineSliceMaterial
                {
                    ChildMaterials = cells,
                    BorderSize = new Rect.BorderSize
                    {
                        Top = thickness, Bottom = thickness, Left = thickness, Right = thickness,
                    },
                },
                FrameInset = 6,
                CaptionStyle = Widgets.MenuLabelStyle,
            };
        }

        private static GroupBox NewBox(string text, CaptionPlacement placement, GroupBoxMaterial frame)
        {
            return new GroupBox
            {
                DebugName = text,
                Material = frame with { CaptionPlacement = placement },
                Text = text,
            };
        }

        private void Place(GroupBox box, Rect bounds, string inside)
        {
            box.Bounds = bounds;
            box.CanvasChildren.Add(new Label(Widgets.MenuLabelStyle, inside)
            {
                DebugName = "inside",
                Bounds = box.CanvasRect,
            });

            Add(box);
        }

        protected override void Populate()
        {
            GroupBoxMaterial frame = ThinFrame(
                Color.FromArgb(170, 170, 170),
                UiPacksheetMaterials.Panel with { TintColor = Color.FromArgb(225, 225, 225) },
                thickness: 2);
            const string Inside = "Inside the frame";

            AddCaption("Caption on the baseline, through the middle, and above the frame.");
            Rect placements = ContentAggregator.NewRow(BoxSize.Y);
            Place(NewBox("Baseline", CaptionPlacement.Baseline, frame), placements.NewCol(BoxSize.X, margin: Gutter),
                Inside);
            Place(NewBox("Middle", CaptionPlacement.Middle, frame), placements.NewCol(BoxSize.X, margin: Gutter),
                Inside);
            Place(NewBox("Above", CaptionPlacement.Above, frame), placements.NewCol(BoxSize.X), Inside);

            AddCaption("Frame art at scale 2, and a box sized to its content with a caption wider than it.");
            Rect variations = ContentAggregator.NewRow(BoxSize.Y);
            Place(NewBox("Scaled", CaptionPlacement.Baseline, frame with { Frame = frame.Frame with { Scale = 2 } }),
                variations.NewCol(BoxSize.X, margin: Gutter), Inside);

            GroupBox sized = NewBox("A long caption", CaptionPlacement.Baseline, frame);
            Vector sizedBounds = sized.BoundsSizeFor(new Vector(40, 20));
            Place(sized, Rect.FromPositionAndSize(variations.NewCol(sizedBounds.X).TopLeft, sizedBounds), "Hi");
        }
    }
}