using Azimuth;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UnitTestSharp;

namespace Glass.UnitTests
{
    public class LabelTests : TestFixture
    {
        public class TestFont : IFont
        {
            public Scalar GlyphWidth(char glyph) => 1;
            public Scalar SpaceBetweenGlyphs(char? leftGlyph, char? rightGlyph) => 0.125;

            public Scalar LineAscent => 3;
            public Scalar LineDescent => 8;
            public Scalar LineGap => 11;
        }

        public class TextTest : TestFixture
        {
            public void GetSet()
            {
                var label = new Label();
                label.Text = "test";
                CheckEqual("test", label.Text);
            }

            public void RecalculatesTestSize()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(100, 100));
                label.Font = new TestFont();
                CheckEqual(Vector.Zero, label.TextSize);

                label.Text = "test";

                CheckEqual(new Vector(4.5, 11), label.TextSize);
            }

            public void CalculatedSizeAccountsForLabelWidth()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(4, 100));
                label.Font = new TestFont();
                CheckEqual(Vector.Zero, label.TextSize);

                label.Text = "test";

                CheckEqual(new Vector(3.375, 33), label.TextSize);
            }

            public void CalculatedSizeCannotBeTallerThanBounds()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(4, 1));
                label.Font = new TestFont();
                CheckEqual(Vector.Zero, label.TextSize);

                label.Text = "test";

                CheckEqual(new Vector(3.375, 1), label.TextSize);
            }

            public void CalculatedSizeCanBeWiderThanBounds()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(0.5, 100));
                label.Font = new TestFont();
                CheckEqual(Vector.Zero, label.TextSize);

                label.Text = "test";

                CheckEqual(new Vector(0.5, 77), label.TextSize);
            }
        }

        public class BoundsTest : TestFixture
        {
            public void GetSet()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(100, 100));
                CheckEqual(Rect.FromTwoPoints(Vector.Zero, new Vector(100, 100)), label.Bounds);
            }

            public void RecalculatesTestSize()
            {
                var label = new Label();
                label.Text = "test";
                label.Font = new TestFont();
                CheckEqual(Vector.Zero, label.TextSize);

                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(100, 100));

                CheckEqual(new Vector(4.5, 11), label.TextSize);
            }

            public void CalculatedSizeAccountsForLabelWidth()
            {
                var label = new Label();
                label.Text = "test";
                label.Font = new TestFont();
                CheckEqual(Vector.Zero, label.TextSize);

                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(4, 100));

                CheckEqual(new Vector(3.375, 33), label.TextSize);
            }

            public void CalculatedSizeCannotBeTallerThanBounds()
            {
                var label = new Label();
                label.Text = "test";
                label.Font = new TestFont();
                CheckEqual(Vector.Zero, label.TextSize);

                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(4, 1));

                CheckEqual(new Vector(3.375, 1), label.TextSize);
            }

            public void CalculatedSizeCanBeWiderThanBounds()
            {
                var label = new Label();
                label.Text = "test";
                label.Font = new TestFont();
                CheckEqual(Vector.Zero, label.TextSize);

                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(0.5, 100));

                CheckEqual(new Vector(0.5, 77), label.TextSize);
            }
        }

        public class FontTests : TestFixture
        {
            public void GetSet()
            {
                var label = new Label();
                var font = new TestFont();
                label.Font = font;
                CheckEqual(font, label.Font);
            }

            public void RecalculatesTestSize()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(100, 100));
                label.Text = "test";
                CheckEqual(Vector.Zero, label.TextSize);

                label.Font = new TestFont();

                CheckEqual(new Vector(4.5, 11), label.TextSize);
            }

            public void CalculatedSizeAccountsForLabelWidth()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(4, 100));
                label.Text = "test";
                CheckEqual(Vector.Zero, label.TextSize);

                label.Font = new TestFont();

                CheckEqual(new Vector(3.375, 33), label.TextSize);
            }

            public void CalculatedSizeCannotBeTallerThanBounds()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(4, 1));
                label.Text = "test";
                CheckEqual(Vector.Zero, label.TextSize);

                label.Font = new TestFont();

                CheckEqual(new Vector(3.375, 1), label.TextSize);
            }

            public void CalculatedSizeCanBeWiderThanBounds()
            {
                var label = new Label();
                label.Bounds = Rect.FromTwoPoints(Vector.Zero, new Vector(0.5, 100));
                label.Text = "test";
                CheckEqual(Vector.Zero, label.TextSize);

                label.Font = new TestFont();

                CheckEqual(new Vector(0.5, 77), label.TextSize);
            }
        }

        public void MaterialGetSet()
        {
            var material = new Material();
            var label = new Label();
            label.Material = material;
            CheckEqual(material, label.Material);
        }
    }
}