using KeyOverlay.Core;
using Xunit;

namespace KeyOverlay.Core.Tests;

public class ScanCodesTests
{
    [Theory]
    [InlineData(0x01, false, "KC_ESCAPE")]
    [InlineData(0x1E, false, "KC_A")]
    [InlineData(0x02, false, "KC_1")]
    [InlineData(0x0B, false, "KC_0")]
    [InlineData(0x2A, false, "KC_LSHIFT")]
    [InlineData(0x1D, false, "KC_LCTRL")]
    [InlineData(0x1D, true, "KC_RCTRL")]
    [InlineData(0x38, true, "KC_RALT")]
    [InlineData(0x4B, true, "KC_LEFT")]
    [InlineData(0x3B, false, "KC_F1")]
    [InlineData(0x58, false, "KC_F12")]
    [InlineData(0x5B, true, "KC_LGUI")]
    public void ToKeycode_MapsKnownScanCodes(int scan, bool ext, string expected) =>
        Assert.Equal(expected, ScanCodes.ToKeycode(scan, ext));

    [Fact]
    public void ToKeycode_ReturnsNullForUnknown() =>
        Assert.Null(ScanCodes.ToKeycode(0x7F, false));
}

public class PressedKeysTests
{
    [Fact]
    public void Apply_TracksDownAndUp()
    {
        var p = new PressedKeys();
        p.Apply(0x1E, false, true);
        Assert.True(p.IsDown("KC_A"));
        p.Apply(0x1E, false, false);
        Assert.False(p.IsDown("KC_A"));
    }

    [Fact]
    public void ShiftDown_TrueForEitherShift()
    {
        var p = new PressedKeys();
        p.Apply(0x36, false, true);
        Assert.True(p.ShiftDown);
    }

    [Fact]
    public void CtrlAndLeftAlt_DetectsChord()
    {
        var p = new PressedKeys();
        Assert.False(p.CtrlAndLeftAltDown);
        p.Apply(0x1D, false, true);
        p.Apply(0x38, false, true);
        Assert.True(p.CtrlAndLeftAltDown);
    }
}

public class BoardGeometryTests
{
    [Fact]
    public void RightHalf_IsMirroredSoOuterColumnIsRightmost()
    {
        var outer = BoardGeometry.Position(new KeyId(Side.Right, 0, 0));
        var inner = BoardGeometry.Position(new KeyId(Side.Right, 0, 5));
        Assert.True(outer.X > inner.X);
    }

    [Fact]
    public void RightHalf_IsToTheRightOfLeftHalf()
    {
        var leftInner = BoardGeometry.Position(new KeyId(Side.Left, 0, 5));
        var rightInner = BoardGeometry.Position(new KeyId(Side.Right, 0, 5));
        Assert.True(rightInner.X > leftInner.X + 1);
    }

    [Fact]
    public void SingleHalf_WidthIsSixColumns() =>
        Assert.Equal(6, BoardGeometry.WidthOf(Side.Right));

    [Fact]
    public void SingleHalf_BothWidthMatchesFullBoard() =>
        Assert.Equal(BoardGeometry.Width, BoardGeometry.WidthOf(null));

    [Theory]
    [InlineData(Side.Left)]
    [InlineData(Side.Right)]
    public void SingleHalf_KeysStartAtOriginAndFitWidth(Side side)
    {
        for (var col = 0; col < 6; col++)
        {
            var p = BoardGeometry.Position(new KeyId(side, 0, col), side);
            Assert.InRange(p.X, 0, BoardGeometry.WidthOf(side) - 1);
        }
    }

    [Fact]
    public void SingleHalf_RightOuterColumnIsStillRightmost()
    {
        var outer = BoardGeometry.Position(new KeyId(Side.Right, 0, 0), Side.Right);
        var inner = BoardGeometry.Position(new KeyId(Side.Right, 0, 5), Side.Right);
        Assert.True(outer.X > inner.X);
    }

    [Fact]
    public void SingleHalf_KeepsSameRowPositionAsFullBoard()
    {
        var key = new KeyId(Side.Right, 2, 1);
        Assert.Equal(BoardGeometry.Position(key).Y, BoardGeometry.Position(key, Side.Right).Y);
    }

    [Fact]
    public void AllKeys_FitInsideBoardBounds()
    {
        foreach (var side in new[] { Side.Left, Side.Right })
        {
            for (var row = 0; row < 5; row++)
            {
                for (var col = 0; col < 6; col++)
                {
                    var p = BoardGeometry.Position(new KeyId(side, row, col));
                    Assert.InRange(p.X, 0, BoardGeometry.Width - 1);
                    Assert.InRange(p.Y, 0, BoardGeometry.Height - 1);
                }
            }
        }
    }
}