using System.Numerics;
using System.Reflection;

namespace Terminal.Gui.DrawingTests;

public partial class ColorTests {

	[Theory]
	[Trait ("Category", "Operators")]
	[CombinatorialData]
	public void ExplicitOperator_ToVector3_ReturnsCorrectValue ([CombinatorialRange (0, 255, 51)] byte r, [CombinatorialRange (0, 255, 51)] byte g, [CombinatorialRange (0, 255, 51)] byte b, [CombinatorialValues (0, 255)] byte a)
	{
		Color color = new (r, g, b, a);

		Vector3 vector = (Vector3)color;

		Assert.Equal (color.R, vector.X);
		Assert.Equal (color.G, vector.Y);
		Assert.Equal (color.B, vector.Z);
	}

	[Theory]
	[CombinatorialData]
	public void GeneratedEqualityOperators_BehaveAsExpected ([CombinatorialValues (0, short.MaxValue, int.MaxValue, uint.MaxValue)] uint u1, [CombinatorialValues (0, short.MaxValue, int.MaxValue, uint.MaxValue)] uint u2)
	{
		Color color1 = u1;
		Color color2 = u2;

		if ( u1 == u2 ) {
			Assert.True (color1 == color2);
			Assert.False (color1 != color2);
		}
		else {
			Assert.True (color1 != color2);
			Assert.False (color1 == color2);
		}
	}

	[Theory]
	[CombinatorialData]
	[Trait ("Category", "Operators")]
	public void GetHashCode_DelegatesTo_Rgba ([CombinatorialRandomData (Count = 16)] int rgba)
	{
		Color color = new (rgba);

		Assert.Equal (rgba.GetHashCode (), color.GetHashCode ());
	}

	[Theory]
	[Trait ("Category", "Operators")]
	[MemberData (nameof (ColorTestsTheoryDataGenerators.ExplicitOperator_FromColorName_RoundTripsCorrectly), MemberType = typeof (ColorTestsTheoryDataGenerators))]
	public void ImplicitOperator_FromColorName_ReturnsCorrectColorValue (ColorName cname, Color expectedColor)
	{
		Color color = cname;

		Assert.Equal (expectedColor, color);
	}

	[Theory]
	[CombinatorialData]
	[Trait ("Category", "Operators")]
	public void ImplicitOperator_FromInt32_ReturnsCorrectColorValue ([CombinatorialRandomData (Count = 16)] int expectedValue)
	{
		Color color = expectedValue;

		Assert.Equal (expectedValue, color.Rgba);
	}

	[Theory]
	[CombinatorialData]
	[Trait ("Category", "Operators")]
	public void ImplicitOperator_FromUInt32_ReturnsCorrectColorValue ([CombinatorialRandomData (Count = 16)] uint expectedValue)
	{
		Color color = expectedValue;

		Assert.Equal (expectedValue, color.Argb);
	}

	[Theory]
	[CombinatorialData]
	[Trait ("Category", "Operators")]
	public void ImplicitOperator_FromVector3_ReturnsCorrectColorValue ([CombinatorialRange (0, 255, 51)] byte r, [CombinatorialRange (0, 255, 51)] byte g, [CombinatorialRange (0, 255, 51)] byte b)
	{
		Vector3 vector = new (r, g, b);
		Color color = vector;

		Assert.Equal (r, color.R);
		Assert.Equal (g, color.G);
		Assert.Equal (b, color.B);
		Assert.Equal (byte.MaxValue, color.A);
	}

	[Theory]
	[CombinatorialData]
	[Trait ("Category", "Operators")]
	public void ImplicitOperator_FromVector4_ReturnsCorrectColorValue ([CombinatorialRange (0, 255, 51)] byte r, [CombinatorialRange (0, 255, 51)] byte g, [CombinatorialRange (0, 255, 51)] byte b, [CombinatorialValues (0, 255)] byte a)
	{
		Vector4 vector = new (r, g, b, a);
		Color color = vector;

		Assert.Equal (r, color.R);
		Assert.Equal (g, color.G);
		Assert.Equal (b, color.B);
		Assert.Equal (a, color.A);
	}

	[Theory]
	[CombinatorialData]
	[Trait ("Category", "Operators")]
	public void ImplicitOperator_ToInt32_ReturnsCorrectInt32Value ([CombinatorialRandomData (Count = 16)] int expectedValue)
	{
		Color color = new (expectedValue);

		int colorAsInt32 = color;

		Assert.Equal (expectedValue, colorAsInt32);
	}

	[Theory]
	[CombinatorialData]
	[Trait ("Category", "Operators")]
	public void ImplicitOperator_ToUInt32_ReturnsCorrectUInt32Value ([CombinatorialRandomData (Count = 16)] uint expectedValue)
	{
		Color color = new (expectedValue);

		uint colorAsInt32 = color;

		Assert.Equal (expectedValue, colorAsInt32);
	}

	[Theory]
	[CombinatorialData]
	[Trait ("Category", "Operators")]
	public void ImplicitOperator_ToVector4_ReturnsCorrectVector4Value ([CombinatorialRange (0, 255, 51)] byte r, [CombinatorialRange (0, 255, 51)] byte g, [CombinatorialRange (0, 255, 51)] byte b, [CombinatorialValues (0, 255)] byte a)
	{
		Color color = new (r, g, b, a);
		Vector4 vector = color;

		Assert.Equal (r, vector.X);
		Assert.Equal (g, vector.Y);
		Assert.Equal (b, vector.Z);
		Assert.Equal (a, vector.W);
	}
}
public static partial class ColorTestsTheoryDataGenerators {

	public static TheoryData<ColorName, Color> ExplicitOperator_FromColorName_RoundTripsCorrectly ()
	{
		TheoryData<ColorName, Color> data = [];
		data.Add (ColorName.Black, new Color (12, 12, 12));
		data.Add (ColorName.Blue, new Color (0, 55, 218));
		data.Add (ColorName.Green, new Color (19, 161, 14));
		data.Add (ColorName.Cyan, new Color (58, 150, 221));
		data.Add (ColorName.Red, new Color (197, 15, 31));
		data.Add (ColorName.Magenta, new Color (136, 23, 152));
		data.Add (ColorName.Yellow, new Color (128, 64, 32));
		data.Add (ColorName.Gray, new Color (204, 204, 204));
		data.Add (ColorName.DarkGray, new Color (118, 118, 118));
		data.Add (ColorName.BrightBlue, new Color (59, 120, 255));
		data.Add (ColorName.BrightGreen, new Color (22, 198, 12));
		data.Add (ColorName.BrightCyan, new Color (97, 214, 214));
		data.Add (ColorName.BrightRed, new Color (231, 72, 86));
		data.Add (ColorName.BrightMagenta, new Color (180, 0, 158));
		data.Add (ColorName.BrightYellow, new Color (249, 241, 165));
		data.Add (ColorName.White, new Color (242, 242, 242));
		return data;
	}

	public static TheoryData<FieldInfo, int> Fields_At_Expected_Offsets ()
	{
		TheoryData<FieldInfo, int> data = [];
		data.Add (typeof (Color).GetField ("Argb", BindingFlags.Instance | BindingFlags.Public | BindingFlags.ExactBinding), 0);
		data.Add (typeof (Color).GetField ("Rgba", BindingFlags.Instance | BindingFlags.Public | BindingFlags.ExactBinding), 0);
		data.Add (typeof (Color).GetField ("B", BindingFlags.Instance | BindingFlags.Public | BindingFlags.ExactBinding), 0);
		data.Add (typeof (Color).GetField ("G", BindingFlags.Instance | BindingFlags.Public | BindingFlags.ExactBinding), 1);
		data.Add (typeof (Color).GetField ("R", BindingFlags.Instance | BindingFlags.Public | BindingFlags.ExactBinding), 2);
		data.Add (typeof (Color).GetField ("A", BindingFlags.Instance | BindingFlags.Public | BindingFlags.ExactBinding), 3);
		return data;
	}
}