namespace Terminal.Gui.TypeTests;

public class RectangleTests
{
    [Theory]

    // Empty
    [InlineData (
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0
                )]
    [InlineData (
                    0,
                    0,
                    0,
                    0,
                    1,
                    0,
                    -1,
                    0,
                    2,
                    0
                )]
    [InlineData (
                    0,
                    0,
                    0,
                    0,
                    0,
                    1,
                    0,
                    -1,
                    0,
                    2
                )]
    [InlineData (
                    0,
                    0,
                    0,
                    0,
                    1,
                    1,
                    -1,
                    -1,
                    2,
                    2
                )]
    [InlineData (
                    0,
                    0,
                    0,
                    0,
                    -1,
                    -1, // Throws
                    0,
                    0,
                    0,
                    0
                )]

    // Zero location, Size of 1
    [InlineData (
                    0,
                    0,
                    1,
                    1,
                    0,
                    0,
                    0,
                    0,
                    1,
                    1
                )]
    [InlineData (
                    0,
                    0,
                    1,
                    1,
                    1,
                    0,
                    -1,
                    0,
                    3,
                    1
                )]
    [InlineData (
                    0,
                    0,
                    1,
                    1,
                    0,
                    1,
                    0,
                    -1,
                    1,
                    3
                )]
    [InlineData (
                    0,
                    0,
                    1,
                    1,
                    1,
                    1,
                    -1,
                    -1,
                    3,
                    3
                )]

    // Positive location, Size of 1
    [InlineData (
                    1,
                    1,
                    1,
                    1,
                    0,
                    0,
                    1,
                    1,
                    1,
                    1
                )]
    [InlineData (
                    1,
                    1,
                    1,
                    1,
                    1,
                    0,
                    0,
                    1,
                    3,
                    1
                )]
    [InlineData (
                    1,
                    1,
                    1,
                    1,
                    0,
                    1,
                    1,
                    0,
                    1,
                    3
                )]
    [InlineData (
                    1,
                    1,
                    1,
                    1,
                    1,
                    1,
                    0,
                    0,
                    3,
                    3
                )]
    public void Inflate (
        int x,
        int y,
        int width,
        int height,
        int inflateWidth,
        int inflateHeight,
        int expectedX,
        int exptectedY,
        int expectedWidth,
        int expectedHeight
    )
    {
        var rect = new Rectangle (x, y, width, height);

        if (rect.Width + inflateWidth < 0 || rect.Height + inflateHeight < 0)
        {
            Assert.Throws<ArgumentException> (() => rect.Inflate (inflateWidth, inflateHeight));
        }
        else
        {
            rect.Inflate (inflateWidth, inflateHeight);
        }

        Assert.Equal (expectedWidth, rect.Width);
        Assert.Equal (expectedHeight, rect.Height);
        Assert.Equal (expectedX, rect.X);
        Assert.Equal (exptectedY, rect.Y);

        // Use the other overload (Size)
        rect = new Rectangle (x, y, width, height);

        if (rect.Width + inflateWidth < 0 || rect.Height + inflateHeight < 0)
        {
            Assert.Throws<ArgumentException> (() => rect.Inflate (new Size (inflateWidth, inflateHeight)));
        }
        else
        {
            rect.Inflate (new Size (inflateWidth, inflateHeight));
        }

        Assert.Equal (expectedWidth, rect.Width);
        Assert.Equal (expectedHeight, rect.Height);
        Assert.Equal (expectedX, rect.X);
        Assert.Equal (exptectedY, rect.Y);
    }

    [Fact]
    public void Negative_X_Y_Positions ()
    {
        var rect = new Rectangle (-10, -5, 100, 50);
        int yCount = 0, xCount = 0, yxCount = 0;

        for (int line = rect.Y; line < rect.Y + rect.Height; line++)
        {
            yCount++;
            xCount = 0;

            for (int col = rect.X; col < rect.X + rect.Width; col++)
            {
                xCount++;
                yxCount++;
            }
        }

        Assert.Equal (yCount, rect.Height);
        Assert.Equal (xCount, rect.Width);
        Assert.Equal (yxCount, rect.Height * rect.Width);
    }

    [Fact]
    public void Positive_X_Y_Positions ()
    {
        var rect = new Rectangle (10, 5, 100, 50);
        int yCount = 0, xCount = 0, yxCount = 0;

        for (int line = rect.Y; line < rect.Y + rect.Height; line++)
        {
            yCount++;
            xCount = 0;

            for (int col = rect.X; col < rect.X + rect.Width; col++)
            {
                xCount++;
                yxCount++;
            }
        }

        Assert.Equal (yCount, rect.Height);
        Assert.Equal (xCount, rect.Width);
        Assert.Equal (yxCount, rect.Height * rect.Width);
    }

    [Fact]
    public void Rect_Contains ()
    {
        var rect = new Rectangle (0, 0, 3, 3);
        Assert.True (rect.Contains (new Point (1, 1)));
        Assert.True (rect.Contains (new Point (1, 2)));
        Assert.True (rect.Contains (new Point (2, 1)));
        Assert.True (rect.Contains (new Point (2, 2)));

        Assert.False (rect.Contains (new Point (-1, 1)));
        Assert.False (rect.Contains (new Point (1, -1)));
        Assert.False (rect.Contains (new Point (3, 2)));
        Assert.False (rect.Contains (new Point (2, 3)));
        Assert.False (rect.Contains (new Point (3, 3)));

        Assert.True (rect.Contains (new Rectangle (1, 1, 2, 2)));
        Assert.True (rect.Contains (new Rectangle (1, 2, 2, 1)));
        Assert.True (rect.Contains (new Rectangle (2, 1, 1, 2)));
        Assert.True (rect.Contains (new Rectangle (2, 2, 1, 1)));
        Assert.True (rect.Contains (new Rectangle (0, 0, 3, 3)));

        Assert.False (rect.Contains (new Rectangle (-1, 1, 3, 3)));
        Assert.False (rect.Contains (new Rectangle (1, -1, 3, 3)));
        Assert.False (rect.Contains (new Rectangle (3, 2, 3, 3)));
        Assert.False (rect.Contains (new Rectangle (2, 3, 3, 3)));
        Assert.False (rect.Contains (new Rectangle (3, 3, 3, 3)));

        Assert.True (rect.Contains (1, 1));
        Assert.True (rect.Contains (1, 2));
        Assert.True (rect.Contains (2, 1));
        Assert.True (rect.Contains (2, 2));

        Assert.False (rect.Contains (-1, 1));
        Assert.False (rect.Contains (1, -1));
        Assert.False (rect.Contains (3, 2));
        Assert.False (rect.Contains (2, 3));
        Assert.False (rect.Contains (3, 3));
    }

    [Fact]
    public void Rect_Equals ()
    {
        var rect1 = new Rectangle ();
        var rect2 = new Rectangle ();
        Assert.Equal (rect1, rect2);

        rect1 = new Rectangle (1, 2, 3, 4);
        rect2 = new Rectangle (1, 2, 3, 4);
        Assert.Equal (rect1, rect2);

        rect1 = new Rectangle (1, 2, 3, 4);
        rect2 = new Rectangle (-1, 2, 3, 4);
        Assert.NotEqual (rect1, rect2);
    }

    [Fact]
    public void Rect_New ()
    {
        var rect = new Rectangle ();
        Assert.True (rect.IsEmpty);

        rect = new Rectangle (new Point (), new Size ());
        Assert.True (rect.IsEmpty);

        rect = new Rectangle (1, 2, 3, 4);
        Assert.False (rect.IsEmpty);

        rect = new Rectangle (-1, -2, 3, 4);
        Assert.False (rect.IsEmpty);

        Action action = () => new Rectangle (1, 2, -3, 4);
        var ex = Assert.Throws<ArgumentException> (action);
        Assert.Equal ("Width must be greater or equal to 0.", ex.Message);

        action = () => new Rectangle (1, 2, 3, -4);
        ex = Assert.Throws<ArgumentException> (action);
        Assert.Equal ("Height must be greater or equal to 0.", ex.Message);

        action = () => new Rectangle (1, 2, -3, -4);
        ex = Assert.Throws<ArgumentException> (action);
        Assert.Equal ("Width must be greater or equal to 0.", ex.Message);
    }

    [Fact]
    public void Rect_SetsValue ()
    {
        var rect = new Rectangle { X = 0, Y = 0 };
        Assert.True (rect.IsEmpty);

        rect = new Rectangle { X = -1, Y = -2 };
        Assert.False (rect.IsEmpty);

        rect = new Rectangle { Width = 3, Height = 4 };
        Assert.False (rect.IsEmpty);

        rect = new Rectangle { X = -1, Y = -2, Width = 3, Height = 4 };
        Assert.False (rect.IsEmpty);

        Action action = () => { rect = new Rectangle { X = -1, Y = -2, Width = -3, Height = 4 }; };
        var ex = Assert.Throws<ArgumentException> (action);
        Assert.Equal ("Width must be greater or equal to 0.", ex.Message);

        action = () => { rect = new Rectangle { X = -1, Y = -2, Width = 3, Height = -4 }; };
        ex = Assert.Throws<ArgumentException> (action);
        Assert.Equal ("Height must be greater or equal to 0.", ex.Message);

        action = () => { rect = new Rectangle { X = -1, Y = -2, Width = -3, Height = -4 }; };
        ex = Assert.Throws<ArgumentException> (action);
        Assert.Equal ("Width must be greater or equal to 0.", ex.Message);
    }

    [Fact]
    public void Union_EmptyRectangles ()
    {
        var r1 = new Rectangle (0, 0, 0, 0);
        var r2 = new Rectangle (1, 1, 0, 0);
        Rectangle result = Rectangle.Union (r1, r2);
        Assert.Equal (new Rectangle (0, 0, 1, 1), result);
    }

    [Fact]
    public void Union_NegativeCoords ()
    {
        // arrange
        var rect1 = new Rectangle (-2, -2, 4, 4);
        var rect2 = new Rectangle (-1, -1, 5, 5);

        // act
        Rectangle result = Rectangle.Union (rect1, rect2);

        // assert
        Assert.Equal (new Rectangle (-2, -2, 6, 6), result);
    }

    [Fact]
    public void Union_PositiveCoords ()
    {
        var r1 = new Rectangle (0, 0, 2, 2);
        var r2 = new Rectangle (1, 1, 2, 2);
        Rectangle result = Rectangle.Union (r1, r2);
        Assert.Equal (new Rectangle (0, 0, 3, 3), result);
    }

    [Fact]
    public void Union_RectangleAHasNegativeCoordinates_ReturnsCombinedRectangle ()
    {
        // arrange
        var rect1 = new Rectangle (-2, -2, 5, 5);
        var rect2 = new Rectangle (3, 3, 4, 4);

        // act
        Rectangle result = Rectangle.Union (rect1, rect2);

        // assert
        Assert.Equal (new Rectangle (-2, -2, 9, 9), result);
    }

    [Fact]
    public void Union_RectangleAIsLarger_ReturnsA ()
    {
        // arrange
        var rect1 = new Rectangle (1, 1, 6, 6);
        var rect2 = new Rectangle (2, 2, 3, 3);

        // act
        Rectangle result = Rectangle.Union (rect1, rect2);

        // assert
        Assert.Equal (new Rectangle (1, 1, 6, 6), result);
    }

    [Fact]
    public void Union_RectangleBIsLarger_ReturnsB ()
    {
        // arrange
        var rect1 = new Rectangle (1, 1, 3, 3);
        var rect2 = new Rectangle (2, 2, 6, 6);

        // act
        Rectangle result = Rectangle.Union (rect1, rect2);

        // assert
        Assert.Equal (new Rectangle (1, 1, 7, 7), result);
    }

    [Fact]
    public void Union_RectanglesDoNotOverlap_ReturnsCombinedRectangle ()
    {
        // arrange
        var rect1 = new Rectangle (1, 1, 3, 3);
        var rect2 = new Rectangle (5, 5, 3, 3);

        // act
        Rectangle result = Rectangle.Union (rect1, rect2);

        // assert
        Assert.Equal (new Rectangle (1, 1, 7, 7), result);
    }

    [Fact]
    public void Union_RectanglesOverlap_ReturnsCombinedRectangle ()
    {
        // arrange
        var rect1 = new Rectangle (1, 1, 3, 3);
        var rect2 = new Rectangle (2, 2, 3, 3);

        // act
        Rectangle result = Rectangle.Union (rect1, rect2);

        // assert
        Assert.Equal (new Rectangle (1, 1, 4, 4), result);
    }

    [Fact]
    public void Union_RectanglesTouchHorizontally_ReturnsCombinedRectangle ()
    {
        // arrange
        var rect1 = new Rectangle (1, 1, 3, 3);
        var rect2 = new Rectangle (4, 2, 3, 3);

        // act
        Rectangle result = Rectangle.Union (rect1, rect2);

        // assert
        Assert.Equal (new Rectangle (1, 1, 6, 4), result);
    }

    [Fact]
    public void Union_RectanglesTouchVertically_ReturnsCombinedRectangle ()
    {
        // arrange
        var rect1 = new Rectangle (1, 1, 3, 3);
        var rect2 = new Rectangle (2, 4, 3, 3);

        // act
        Rectangle result = Rectangle.Union (rect1, rect2);

        // assert
        Assert.Equal (new Rectangle (1, 1, 4, 6), result);
    }

    [Fact]
    public void Union_SameRectangle ()
    {
        var r1 = new Rectangle (0, 0, 2, 2);
        var r2 = new Rectangle (0, 0, 2, 2);
        Rectangle result = Rectangle.Union (r1, r2);
        Assert.Equal (new Rectangle (0, 0, 2, 2), result);
    }

    [Theory]
    [CombinatorialData]
    public void ToString_ReturnsExpectedString ([CombinatorialValues(-1,0,1)]int x, [CombinatorialValues(-1,0,1)]int y, [CombinatorialValues(1,10)]int width, [CombinatorialValues(1,10)]int height)
    {
        Rectangle r = new (x, y, width, height);
        string expectedString = $"{{X={r.X},Y={r.Y},Width={r.Width},Height={r.Height}}}";
        Assert.Equal (expectedString, r.ToString ());
    }
}