using UnitTestSharp;
using Azimuth;
using Annulus;
using System.Collections.Generic;

namespace Glass.UnitTests.Materials
{
    public class TextMaterialTests : TestFixture
    {
        public static SpriteFontDefinition CreateMonospaceTestFont(int glyphWidth, int glyphHeight)
        {
            var font = new SpriteFontDefinition
            {
                Name = "TestMonospace",
                LineHeight = (ushort)glyphHeight,
                Baseline = (ushort)(glyphHeight * 0.8f),
                Pages = new List<string> { "test" },
                InvalidGlyph = new SpriteFontDefinition.GlyphDefinition
                {
                    Size = new Point(glyphWidth, glyphHeight),
                    XAdvance = glyphWidth
                }
            };

            // populate printable ASCII
            for (char c = ' '; c <= '~'; c++)
            {
                font.GlyphDefinitions[c] = new SpriteFontDefinition.GlyphDefinition
                {
                    Size = new Point(glyphWidth, glyphHeight),
                    XAdvance = glyphWidth
                };
            }

            return font;
        }

        public void CalculateLayoutSizeEmptyString()
        {
            var material = new TextMaterial
            {
                Text = "",
                Font = CreateMonospaceTestFont(3, 4),
            };

            CheckEqual(Vector.Zero, material.CalculateLayoutSize(Vector.PositiveInfinity));
        }

        public void CalculateLayoutSizeSimpleString()
        {
            var material = new TextMaterial
            {
                Text = "test",
                Font = CreateMonospaceTestFont(3, 4),
            };

            CheckEqual(new Vector(12, 4), material.CalculateLayoutSize(Vector.PositiveInfinity));
        }

        public void CalculateLayoutSizeMultilineString()
        {
            var material = new TextMaterial
            {
                Text = "test",
                Font = CreateMonospaceTestFont(3, 4),
            };

            CheckEqual(new Vector(3, 16), material.CalculateLayoutSize(new Vector(3, Scalar.PositiveInfinity)));
        }

        public void CalculateLayoutSizeTooSmall()
        {
            var material = new TextMaterial
            {
                Text = "test",
                Font = CreateMonospaceTestFont(3, 4),
            };

            CheckEqual(new Vector(3, 4), material.CalculateLayoutSize(new Vector(3, 4)));
        }

        public void CalculateLayoutSizeZeroSize()
        {
            var material = new TextMaterial
            {
                Text = "test",
                Font = CreateMonospaceTestFont(3, 4),
            };

            CheckEqual(Vector.Zero, material.CalculateLayoutSize(Vector.Zero));
        }
    }
}