using System;
using System.Drawing;
using Blacklight.Core;
using UnitTestSharp;

namespace Blacklight.WebGL2.UnitTests
{
    public class WebGL2CursorSurfaceTests : TestFixture
    {
        public static CursorImage Cursor(int width, int height)
        {
            return new CursorImage(
                new byte[width * height * CursorImage.BytesPerPixel], new Size(width, height), Point.Empty);
        }

        public class IsWithinBrowserLimitTests : TestFixture
        {
            public void SmallCursor_IsAccepted()
            {
                CheckTrue(WebGL2CursorSurface.IsWithinBrowserLimit(Cursor(32, 32)));
            }

            public void ExactlyTheLimit_IsAccepted()
            {
                CheckTrue(WebGL2CursorSurface.IsWithinBrowserLimit(
                    Cursor(WebGL2CursorSurface.MaximumSide, WebGL2CursorSurface.MaximumSide)));
            }

            public void OnePixelTooWide_IsRefused()
            {
                CheckFalse(WebGL2CursorSurface.IsWithinBrowserLimit(
                    Cursor(WebGL2CursorSurface.MaximumSide + 1, WebGL2CursorSurface.MaximumSide)));
            }

            public void OnePixelTooTall_IsRefused()
            {
                CheckFalse(WebGL2CursorSurface.IsWithinBrowserLimit(
                    Cursor(WebGL2CursorSurface.MaximumSide, WebGL2CursorSurface.MaximumSide + 1)));
            }

            public void NullCursor_Throws()
            {
                CheckThrow(typeof(ArgumentNullException));
                WebGL2CursorSurface.IsWithinBrowserLimit(null);
            }
        }
    }
}