// <copyright file="PngSmokeTests.cs" company="James Jackson-South">
// Copyright (c) James Jackson-South and contributors.
// Licensed under the Apache License, Version 2.0.
// </copyright>

namespace ImageSharp.Tests.Formats.Png
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.IO;
    using Xunit;
    using ImageSharp.Formats;
    using System.Linq;
    using ImageSharp.IO;
    using System.Numerics;

    public class PngSmokeTests
    {
        [Theory]
        [WithTestPatternImages(300, 300, PixelTypes.All)]
        public void GeneralTest<TColor>(TestImageProvider<TColor> provider)
            where TColor : struct, IPixel<TColor>
        {
            // does saving a file then repoening mean both files are identical???
            using (Image<TColor> image = provider.GetImage())
            using (MemoryStream ms = new MemoryStream())
            {
                // image.Save(provider.Utility.GetTestOutputFileName("bmp"));

                image.Save(ms, new PngEncoder());
                ms.Position = 0;
                using (Image img2 = Image.Load(ms, new PngDecoder()))
                {
                    // img2.Save(provider.Utility.GetTestOutputFileName("bmp", "_loaded"), new BmpEncoder());
                    ImageComparer.CheckSimilarity(image, img2);
                }
            }
        }

        [Theory]
        [WithTestPatternImages(100, 100, PixelTypes.All)]
        public void CanSaveIndexedPng<TColor>(TestImageProvider<TColor> provider)
            where TColor : struct, IPixel<TColor>
        {
            // does saving a file then repoening mean both files are identical???
            using (Image<TColor> image = provider.GetImage())
            using (MemoryStream ms = new MemoryStream())
            {
                // image.Save(provider.Utility.GetTestOutputFileName("bmp"));
                image.MetaData.Quality = 256;
                image.Save(ms, new PngEncoder());
                ms.Position = 0;
                using (Image img2 = Image.Load(ms, new PngDecoder()))
                {
                    // img2.Save(provider.Utility.GetTestOutputFileName("bmp", "_loaded"), new BmpEncoder());
                    ImageComparer.CheckSimilarity(image, img2);
                }
            }
        }

        [Theory]
        [WithTestPatternImages(100, 100, PixelTypes.Color)]
        public void CanSaveIndexedPngTwice<TColor>(TestImageProvider<TColor> provider)
            where TColor : struct, IPixel<TColor>
        {
            // does saving a file then repoening mean both files are identical???
            using (Image<TColor> source = provider.GetImage())
            using (MemoryStream ms = new MemoryStream())
            {
                source.MetaData.Quality = 256;
                source.Save(ms, new PngEncoder(), new PngEncoderOptions {
                    Threshold = 200
                });
                ms.Position = 0;
                using (Image img1 = Image.Load(ms, new PngDecoder()))
                {
                    using (MemoryStream ms2 = new MemoryStream())
                    {
                        img1.Save(ms2, new PngEncoder(), new PngEncoderOptions
                        {
                            Threshold = 200
                        });
                        ms2.Position = 0;
                        using (Image img2 = Image.Load(ms2, new PngDecoder()))
                        {
                            using (PixelAccessor<Color> pixels1 = img1.Lock())
                            using (PixelAccessor<Color> pixels2 = img2.Lock())
                            {
                                for (int y = 0; y < img1.Height; y++)
                                {
                                    for (int x = 0; x < img1.Width; x++)
                                    {
                                        Assert.Equal(pixels1[x, y], pixels2[x, y]);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        [Theory]
        [WithTestPatternImages(300, 300, PixelTypes.All)]
        public void Resize<TColor>(TestImageProvider<TColor> provider)
            where TColor : struct, IPixel<TColor>
        {
            // does saving a file then repoening mean both files are identical???
            using (Image<TColor> image = provider.GetImage())
            using (MemoryStream ms = new MemoryStream())
            {
                // image.Save(provider.Utility.GetTestOutputFileName("png"));
                image.Resize(100, 100);
                // image.Save(provider.Utility.GetTestOutputFileName("png", "resize"));

                image.Save(ms, new PngEncoder());
                ms.Position = 0;
                using (Image img2 = Image.Load(ms, new PngDecoder()))
                {
                    ImageComparer.CheckSimilarity(image, img2);
                }
            }
        }
    }
}