using Annulus;
using Azimuth;
using System;
using UnitTestSharp;

namespace Glass.UnitTests
{
    public class TextBoxRenderStateTests : TestFixture
    {
        public static readonly Material Look = new SolidColorMaterial();

        public static TextBox.RenderState NewState()
        {
            return new TextBox.RenderState(new BakedTextMaterial(new TextMaterialStyle(), "ab"));
        }

        public class CtorTests : TestFixture
        {
            public void KeepsTheText()
            {
                var text = new BakedTextMaterial(new TextMaterialStyle(), "ab");

                CheckEqual(text, new TextBox.RenderState(text).Text);
            }

            public void StartsWithNoLooksAndNoCaretShowing()
            {
                TextBox.RenderState state = NewState();

                CheckNull(state.Selection);
                CheckNull(state.InactiveSelection);
                CheckNull(state.Composition);
                CheckNull(state.CompositionTarget);
                CheckFalse(state.CaretVisible);
                CheckEqual(0, state.ReservedRight);
                CheckEqual(0, state.ReservedBottom);
                CheckEqual(0, state.ScrollX);
            }

            public void NoText_Throws()
            {
                CheckThrow(typeof(ArgumentNullException));
                new TextBox.RenderState(null);
            }
        }

        public class SetLooksTests : TestFixture
        {
            public void MakesAnEmptyListOfBandsForEachLook()
            {
                TextBox.RenderState state = NewState();
                var other = new SolidColorMaterial();

                state.SetLooks(Look, other, Look, other);

                CheckEqual(Look, state.Selection.BandMaterial);
                CheckEqual(other, state.InactiveSelection.BandMaterial);
                CheckEqual(Look, state.Composition.BandMaterial);
                CheckEqual(other, state.CompositionTarget.BandMaterial);
                CheckEqual(0, state.Selection.Count);
            }

            public void ANullLook_LeavesNoBands()
            {
                TextBox.RenderState state = NewState();

                state.SetLooks(Look, null, null, null);

                CheckNull(state.InactiveSelection);
                CheckNull(state.Composition);
                CheckNull(state.CompositionTarget);
            }

            public void SetAgain_ReplacesTheBandsWithEmptyOnes()
            {
                TextBox.RenderState state = NewState();
                state.SetLooks(Look, Look, Look, Look);
                state.Selection.Add(TextBoxRenderMaterialTests.RectAt(1, 2, 3, 4));

                state.SetLooks(Look, Look, Look, Look);

                CheckEqual(0, state.Selection.Count);
            }
        }
    }
}