// Copyright (c) Six Labors and contributors.
// Licensed under the Apache License, Version 2.0.

using System.Numerics;
using SixLabors.Fonts;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using SixLabors.ImageSharp.Processing.Processors.Text;
using SixLabors.Primitives;
using SixLabors.Shapes;
using Xunit;

namespace SixLabors.ImageSharp.Tests.Drawing.Text
{
    public class DrawText : BaseImageOperationsExtensionTest
    {
        Rgba32 color = Rgba32.HotPink;

        SolidBrush<Rgba32> brush = Brushes.Solid(Rgba32.HotPink);

        IPath path = new SixLabors.Shapes.Path(
            new LinearLineSegment(
                new SixLabors.Primitives.PointF[] { new Vector2(10, 10), new Vector2(20, 10), new Vector2(20, 10), new Vector2(30, 10), }));

        private readonly FontCollection FontCollection;

        private readonly Font Font;

        public DrawText()
        {
            this.FontCollection = new FontCollection();
            this.Font = this.FontCollection.Install(TestFontUtilities.GetPath("SixLaborsSampleAB.woff")).CreateFont(12);
        }

        [Fact]
        public void FillsForEachACharachterWhenBrushSetAndNotPen()
        {
            this.operations.DrawText(
                new TextGraphicsOptions(true),
                "123",
                this.Font,
                Brushes.Solid(Rgba32.Red),
                null,
                Vector2.Zero);

            this.Verify<DrawTextProcessor<Rgba32>>(0);
        }

        [Fact]
        public void FillsForEachACharachterWhenBrushSetAndNotPenDefaultOptions()
        {
            this.operations.DrawText("123", this.Font, Brushes.Solid(Rgba32.Red), null, Vector2.Zero);

            this.Verify<DrawTextProcessor<Rgba32>>(0);
        }

        [Fact]
        public void FillsForEachACharachterWhenBrushSet()
        {
            this.operations.DrawText(new TextGraphicsOptions(true), "123", this.Font, Brushes.Solid(Rgba32.Red), Vector2.Zero);

            this.Verify<DrawTextProcessor<Rgba32>>(0);
        }

        [Fact]
        public void FillsForEachACharachterWhenBrushSetDefaultOptions()
        {
            this.operations.DrawText("123", this.Font, Brushes.Solid(Rgba32.Red), Vector2.Zero);

            this.Verify<DrawTextProcessor<Rgba32>>(0);
        }

        [Fact]
        public void FillsForEachACharachterWhenColorSet()
        {
            this.operations.DrawText(new TextGraphicsOptions(true), "123", this.Font, Rgba32.Red, Vector2.Zero);

            var processor = this.Verify<DrawTextProcessor<Rgba32>>(0);

            SolidBrush<Rgba32> brush = Assert.IsType<SolidBrush<Rgba32>>(processor.Brush);
            Assert.Equal(Rgba32.Red, brush.Color);
        }

        [Fact]
        public void FillsForEachACharachterWhenColorSetDefaultOptions()
        {
            this.operations.DrawText("123", this.Font, Rgba32.Red, Vector2.Zero);

            var processor = this.Verify<DrawTextProcessor<Rgba32>>(0);

            SolidBrush<Rgba32> brush = Assert.IsType<SolidBrush<Rgba32>>(processor.Brush);
            Assert.Equal(Rgba32.Red, brush.Color);
        }

        [Fact]
        public void DrawForEachACharachterWhenPenSetAndNotBrush()
        {
            this.operations.DrawText(
                new TextGraphicsOptions(true),
                "123",
                this.Font,
                null,
                Pens.Dash(Rgba32.Red, 1),
                Vector2.Zero);

            var processor = this.Verify<DrawTextProcessor<Rgba32>>(0);
        }

        [Fact]
        public void DrawForEachACharachterWhenPenSetAndNotBrushDefaultOptions()
        {
            this.operations.DrawText("123", this.Font, null, Pens.Dash(Rgba32.Red, 1), Vector2.Zero);

            var processor = this.Verify<DrawTextProcessor<Rgba32>>(0);
        }

        [Fact]
        public void DrawForEachACharachterWhenPenSet()
        {
            this.operations.DrawText(new TextGraphicsOptions(true), "123", this.Font, Pens.Dash(Rgba32.Red, 1), Vector2.Zero);

            var processor = this.Verify<DrawTextProcessor<Rgba32>>(0);
        }

        [Fact]
        public void DrawForEachACharachterWhenPenSetDefaultOptions()
        {
            this.operations.DrawText("123", this.Font, Pens.Dash(Rgba32.Red, 1), Vector2.Zero);

            var processor = this.Verify<DrawTextProcessor<Rgba32>>(0);

            Assert.Equal("123", processor.Text);
            Assert.Equal(this.Font, processor.Font);
            var penBrush = Assert.IsType<SolidBrush<Rgba32>>(processor.Pen.StrokeFill);
            Assert.Equal(Rgba32.Red, penBrush.Color);
            Assert.Equal(1, processor.Pen.StrokeWidth);
            Assert.Equal(PointF.Empty, processor.Location);
        }

        [Fact]
        public void DrawForEachACharachterWhenPenSetAndFillFroEachWhenBrushSet()
        {
            this.operations.DrawText(
                new TextGraphicsOptions(true),
                "123",
                this.Font,
                Brushes.Solid(Rgba32.Red),
                Pens.Dash(Rgba32.Red, 1),
                Vector2.Zero);

            var processor = this.Verify<DrawTextProcessor<Rgba32>>(0);

            Assert.Equal("123", processor.Text);
            Assert.Equal(this.Font, processor.Font);
            var brush = Assert.IsType<SolidBrush<Rgba32>>(processor.Brush);
            Assert.Equal(Rgba32.Red, brush.Color);
            Assert.Equal(PointF.Empty, processor.Location);
            var penBrush = Assert.IsType<SolidBrush<Rgba32>>(processor.Pen.StrokeFill);
            Assert.Equal(Rgba32.Red, penBrush.Color);
            Assert.Equal(1, processor.Pen.StrokeWidth);
        }
    }
}