using Annulus;
using Azimuth;

namespace Glass.Testbed
{
    public class FontsTestCase : TestCase
    {
        public FontsTestCase(string name) : base(name) { }

        private const string LoremIpsum = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do " +
            "eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud " +
            "exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.";

        private const int LinesShown = 3;

        private const int BoxWidth = 340;

        private static TextMaterial Sample(SpriteFontDefinition font)
        {
            return new TextMaterial
            {
                Font = font,
                Text = LoremIpsum,
                TintColor = System.Drawing.Color.Black,
                VerticalAlignment = Alignment.Vertical.Top,
                OverflowBehavior = TextOverflow.Ellipsis,
            };
        }

        private static Vector BoxSizeFor(SpriteFontDefinition font, Scalar verticalMargin)
        {
            return new Vector(BoxWidth, font.LineHeight * LinesShown + 2 * verticalMargin);
        }

        private void AddSample(ref Rect row, string face, SpriteFontDefinition font, Vector boxSize)
        {
            Rect cell = row.NewCol(boxSize.X, margin: Gutter);

            AddCaption($"{face} {font.LineHeight}px", ref cell);

            Add(Sample(font)
                .BuildControl(Constraints.Tight(boxSize))
                .WrapIn(UiPacksheetMaterials.GreenFlatPanel, cell.TopLeft));
        }

        protected override void Populate()
        {
            var rows = new[]
            {
                new[] { ("Philosopher", Fonts.Philosopher18), ("Liberation Sans", Fonts.LiberationSans16) },
                new[] { ("Philosopher", Fonts.Philosopher32), ("Liberation Sans", Fonts.LiberationSans32) },
                new[] { ("Philosopher", Fonts.Philosopher64), ("Liberation Sans", Fonts.LiberationSans64) },
            };

            Scalar verticalMargin = Sample(Fonts.Philosopher32).VerticalMargin;
            Scalar captionHeight = Widgets.Caption("").Font.LineHeight;

            foreach (var cells in rows)
            {
                Scalar tallest = 0;
                foreach (var (_, font) in cells)
                {
                    Scalar boxHeight = BoxSizeFor(font, verticalMargin).Y;
                    if (boxHeight > tallest)
                    {
                        tallest = boxHeight;
                    }
                }

                Rect row = ContentAggregator.NewRow(tallest + captionHeight + 4, margin: Gutter);

                foreach (var (face, font) in cells)
                {
                    AddSample(ref row, face, font, BoxSizeFor(font, verticalMargin));
                }
            }
        }
    }
}