using Xunit.Abstractions;

namespace Terminal.Gui.ViewTests;

public class ShadowStyleTests (ITestOutputHelper _output)
{
    [Fact]
    public void Default_None ()
    {
        var view = new View ();
        Assert.Equal (ShadowStyle.None, view.ShadowStyle);
        Assert.Equal (ShadowStyle.None, view.Margin.ShadowStyle);
        view.Dispose ();
    }

    [Theory]
    [InlineData (ShadowStyle.None)]
    [InlineData (ShadowStyle.Opaque)]
    [InlineData (ShadowStyle.Transparent)]
    public void Set_View_Sets_Margin (ShadowStyle style)
    {
        var view = new View ();

        view.ShadowStyle = style;
        Assert.Equal (style, view.ShadowStyle);
        Assert.Equal (style, view.Margin.ShadowStyle);
        view.Dispose ();
    }

    [Theory]
    [InlineData (ShadowStyle.None, 0, 0, 0, 0)]
    [InlineData (ShadowStyle.Opaque, 1, 0, 0, 1)]
    [InlineData (ShadowStyle.Transparent, 1, 0, 0, 1)]
    public void ShadowStyle_Button1Pressed_Causes_Movement (ShadowStyle style, int expectedLeft, int expectedTop, int expectedRight, int expectedBottom)
    {
        var superView = new View
        {
            Height = 10, Width = 10
        };

        View view = new ()
        {
            Width = Dim.Auto (),
            Height = Dim.Auto (),
            Text = "0123",
            HighlightStyle = HighlightStyle.Pressed,
            ShadowStyle = style,
            CanFocus = true
        };

        superView.Add (view);
        superView.BeginInit ();
        superView.EndInit ();

        Thickness origThickness = view.Margin.Thickness;
        view.NewMouseEvent (new () { Flags = MouseFlags.Button1Pressed, Position = new (0, 0) });
        Assert.Equal (new (expectedLeft, expectedTop, expectedRight, expectedBottom), view.Margin.Thickness);

        view.NewMouseEvent (new () { Flags = MouseFlags.Button1Released, Position = new (0, 0) });
        Assert.Equal (origThickness, view.Margin.Thickness);
    }

    [Theory]
    [InlineData (ShadowStyle.None, 0, 0, 0, 0)]
    [InlineData (ShadowStyle.Opaque, 0, 0, 1, 1)]
    [InlineData (ShadowStyle.Transparent, 0, 0, 1, 1)]
    public void ShadowStyle_Margin_Thickness (ShadowStyle style, int expectedLeft, int expectedTop, int expectedRight, int expectedBottom)
    {
        var superView = new View
        {
            Height = 10, Width = 10
        };

        View view = new ()
        {
            Width = Dim.Auto (),
            Height = Dim.Auto (),
            Text = "0123",
            HighlightStyle = HighlightStyle.Pressed,
            ShadowStyle = style,
            CanFocus = true
        };

        superView.Add (view);
        superView.BeginInit ();
        superView.EndInit ();

        Assert.Equal (new (expectedLeft, expectedTop, expectedRight, expectedBottom), view.Margin.Thickness);
    }

    [Theory]
    [InlineData (
                    ShadowStyle.None,
                    """
                    011
                    111
                    111
                    """)]
    [InlineData (
                    ShadowStyle.Transparent,
                    """
                    031
                    331
                    111
                    """)]
    [InlineData (
                    ShadowStyle.Opaque,
                    """
                    021
                    221
                    111
                    """)]
    [SetupFakeDriver]
    public void ShadowView_Colors (ShadowStyle style, string expectedAttrs)
    {
        Color fg = Color.Red;
        Color bg = Color.Green;

        // 0 - View
        // 1 - SuperView
        // 2 - Opaque - fg is Black, bg is SuperView.Bg
        // 3 - Transparent - fg is darker fg, bg is darker bg
        Attribute [] attributes =
        {
            Attribute.Default,
            new (fg, bg),
            new (Color.Black, bg),
            new (fg.GetDarkerColor (), bg.GetDarkerColor ())
        };

        var superView = new View
        {
            Height = 3,
            Width = 3,
            Text = "012ABC!@#",
            ColorScheme = new (new Attribute (fg, bg))
        };
        superView.TextFormatter.WordWrap = true;

        View view = new ()
        {
            Width = Dim.Auto (),
            Height = Dim.Auto (),
            Text = " ",
            ShadowStyle = style,
            ColorScheme = new (Attribute.Default)
        };
        superView.Add (view);
        superView.BeginInit ();
        superView.EndInit ();

        superView.Draw ();
        TestHelpers.AssertDriverAttributesAre (expectedAttrs, Application.Driver, attributes);
    }

    [Theory]
    [InlineData (ShadowStyle.None, 3)]
    [InlineData (ShadowStyle.Opaque, 4)]
    [InlineData (ShadowStyle.Transparent, 4)]
    public void Style_Changes_Magin_Thickness (ShadowStyle style, int expected)
    {
        var view = new View ();
        view.Margin.Thickness = new (3);
        view.ShadowStyle = style;
        Assert.Equal (new (3, 3, expected, expected), view.Margin.Thickness);

        view.ShadowStyle = ShadowStyle.None;
        Assert.Equal (new (3), view.Margin.Thickness);
        view.Dispose ();
    }

    // Visual tests
    [Theory]
    [InlineData (
                    ShadowStyle.None,
                    """
                    01#$
                    AB#$
                    !@#$
                    !@#$
                    """)]
    [InlineData (
                    ShadowStyle.Opaque,
                    """
                    01▖$
                    AB▌$
                    ▝▀▘$
                    !@#$
                    """)]
    [InlineData (
                    ShadowStyle.Transparent,
                    """
                    01#$
                    AB#$
                    !@#$
                    !@#$
                    """)]
    [SetupFakeDriver]
    public void Visual_Test (ShadowStyle style, string expected)
    {
        var superView = new View
        {
            Width = 4,
            Height = 4,
            Text = "!@#$".Repeat (4)
        };
        superView.TextFormatter.WordWrap = true;

        var view = new View
        {
            Text = "01\nAB",
            Width = Dim.Auto (),
            Height = Dim.Auto ()
        };
        view.ShadowStyle = style;
        superView.Add (view);
        superView.BeginInit ();
        superView.EndInit ();
        superView.Draw ();

        TestHelpers.AssertDriverContentsWithFrameAre (expected, _output);
        view.Dispose ();
    }
}