// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
// Licensed under the Apache License, Version 2.0.

using System;
using System.IO;
using System.Text;
using ImageMagick;
using Xunit;

namespace Magick.NET.Tests;

public partial class MagickImageTests
{
    public partial class ThePingMethod
    {
        public class WithByteArray
        {
            [Fact]
            public void ShouldThrowExceptionWhenArrayIsNull()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("data", () => image.Ping((byte[])null!));
            }

            [Fact]
            public void ShouldThrowExceptionWhenArrayIsEmpty()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("data", () => image.Ping(Array.Empty<byte>()));
            }

            [Fact]
            public void ShouldPingImage()
            {
                var bytes = File.ReadAllBytes(Files.SnakewarePNG);
                using var image = new MagickImage();
                image.Ping(bytes);

                Assert.Equal(286U, image.Width);
                Assert.Equal(67U, image.Height);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }

        public class WithByteArrayAndOffset
        {
            [Fact]
            public void ShouldThrowExceptionWhenArrayIsNull()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("data", () => image.Ping((byte[])null!, 0, 0));
            }

            [Fact]
            public void ShouldThrowExceptionWhenArrayIsEmpty()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("data", () => image.Ping(Array.Empty<byte>(), 0, 0));
            }

            [Fact]
            public void ShouldThrowExceptionWhenCountIsZero()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("count", () => image.Ping(new byte[] { 215 }, 0, 0));
            }

            [Fact]
            public void ShouldPingImage()
            {
                var fileBytes = File.ReadAllBytes(Files.SnakewarePNG);
                var bytes = new byte[fileBytes.Length + 10];
                fileBytes.CopyTo(bytes, 10);
                using var image = new MagickImage();
                image.Ping(bytes, 10, (uint)bytes.Length - 10);

                Assert.Equal(286U, image.Width);
                Assert.Equal(67U, image.Height);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }

        public class WithByteArrayAndOffsetAndMagickReadSettings
        {
            [Fact]
            public void ShouldThrowExceptionWhenArrayIsNull()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("data", () => image.Ping(null!, 0, 0, settings));
            }

            [Fact]
            public void ShouldThrowExceptionWhenArrayIsEmpty()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("data", () => image.Ping(Array.Empty<byte>(), 0, 0, settings));
            }

            [Fact]
            public void ShouldThrowExceptionWhenCountIsZero()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("count", () => image.Ping(new byte[] { 215 }, 0, 0, settings));
            }

            [Fact]
            public void ShouldPingImage()
            {
                var settings = new MagickReadSettings();
                var fileBytes = File.ReadAllBytes(Files.SnakewarePNG);
                var bytes = new byte[fileBytes.Length + 10];
                fileBytes.CopyTo(bytes, 10);
                using var image = new MagickImage();
                image.Ping(bytes, 10, (uint)bytes.Length - 10, settings);

                Assert.Equal(286U, image.Width);
                Assert.Equal(67U, image.Height);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldNotThrowExceptionWhenSettingsIsNull()
            {
                var bytes = File.ReadAllBytes(Files.CirclePNG);
                using var image = new MagickImage();
                image.Ping(bytes, 0, (uint)bytes.Length, null);

                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }

        public class WithByteArrayAndMagickReadSettings
        {
            [Fact]
            public void ShouldThrowExceptionWhenArrayIsNull()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("data", () => image.Ping((byte[])null!, settings));
            }

            [Fact]
            public void ShouldThrowExceptionWhenArrayIsEmpty()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("data", () => image.Ping(Array.Empty<byte>(), settings));
            }

            [Fact]
            public void ShouldNotThrowExceptionWhenSettingsIsNull()
            {
                using var image = new MagickImage();

                var bytes = File.ReadAllBytes(Files.CirclePNG);
                image.Ping(bytes, null);

                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldUseTheCorrectReaderWhenFormatIsSet()
            {
                var bytes = Encoding.ASCII.GetBytes("%PDF-");
                var settings = new MagickReadSettings
                {
                    Format = MagickFormat.Png,
                };
                using var image = new MagickImage();

                var exception = Assert.Throws<MagickCorruptImageErrorException>(() => image.Ping(bytes, settings));

                Assert.Contains("ReadPNGImage", exception.Message);
            }

            [Fact]
            public void ShouldResetTheFormatAfterReading()
            {
                var settings = new MagickReadSettings
                {
                    Format = MagickFormat.Png,
                };

                var bytes = File.ReadAllBytes(Files.CirclePNG);

                using var image = new MagickImage();
                image.Ping(bytes, settings);

                Assert.Equal(MagickFormat.Unknown, image.Settings.Format);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }

        public class WithFileInfo
        {
            [Fact]
            public void ShouldThrowExceptionWhenFileInfoIsNull()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("file", () => image.Ping((FileInfo)null!));
            }
        }

        public class WithFileInfoAndMagickReadSettings
        {
            [Fact]
            public void ShouldThrowExceptionWhenFileInfoIsNull()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("file", () => image.Ping((FileInfo)null!, settings));
            }

            [Fact]
            public void ShouldNotThrowExceptionWhenSettingsIsNull()
            {
                using var image = new MagickImage();
                image.Ping(new FileInfo(Files.CirclePNG), null);

                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }

        public class WithFileName
        {
            [Fact]
            public void ShouldThrowExceptionWhenFileNameIsNull()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("fileName", () => image.Ping((string)null!));
            }

            [Fact]
            public void ShouldThrowExceptionWhenFileNameIsEmpty()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("fileName", () => image.Ping(string.Empty));
            }

            [Fact]
            public void ShouldThrowExceptionWhenFileIsMissing()
            {
                using var image = new MagickImage();

                var exception = Assert.Throws<MagickBlobErrorException>(() => image.Ping(Files.Missing));
                Assert.Contains("error/blob.c/OpenBlob", exception.Message);
            }

            [Fact]
            public void ShouldThrowExceptionWhenFileWithFormatIsMissing()
            {
                using var image = new MagickImage();

                var exception = Assert.Throws<MagickBlobErrorException>(() => image.Ping("png:" + Files.Missing));
                Assert.Contains("error/blob.c/OpenBlob", exception.Message);
            }

            [Fact]
            public void ShouldPingImage()
            {
                using var image = new MagickImage();
                image.Ping(Files.SnakewarePNG);

                Assert.Equal(286U, image.Width);
                Assert.Equal(67U, image.Height);
                Assert.Equal(MagickFormat.Png, image.Format);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldPingBuiltinImage()
            {
                using var image = new MagickImage();
                image.Ping(Files.Builtin.Rose);

                Assert.Equal(70U, image.Width);
                Assert.Equal(46U, image.Height);
                Assert.Equal(MagickFormat.Pnm, image.Format);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldPingImageWithNonAsciiFileName()
            {
                using var image = new MagickImage();
                image.Ping(Files.RoseSparkleGIF);

                Assert.Equal("RöseSparkle.gif", Path.GetFileName(image.FileName));
                Assert.Equal(70U, image.Width);
                Assert.Equal(46U, image.Height);
                Assert.Equal(MagickFormat.Gif, image.Format);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldPingImageWithFormat()
            {
                using var image = new MagickImage();
                image.Ping("png:" + Files.SnakewarePNG);

                Assert.Equal(286U, image.Width);
                Assert.Equal(67U, image.Height);
                Assert.Equal(MagickFormat.Png, image.Format);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldReadTheImageProfile()
            {
                using var image = new MagickImage();
                image.Ping(Files.EightBimTIF);

                Assert.NotNull(image.Get8BimProfile());
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }

        public class WithFileNameAndMagickReadSettings
        {
            [Fact]
            public void ShouldThrowExceptionWhenFileNameIsNull()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("fileName", () => image.Ping((string)null!, settings));
            }

            [Fact]
            public void ShouldThrowExceptionWhenFileNameIsEmpty()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("fileName", () => image.Ping(string.Empty, settings));
            }

            [Fact]
            public void ShouldNotThrowExceptionWhenSettingsIsNull()
            {
                using var image = new MagickImage();
                image.Ping(Files.CirclePNG, null);

                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldResetTheFormatAfterReadingFile()
            {
                var settings = new MagickReadSettings
                {
                    Format = MagickFormat.Png,
                };

                using var image = new MagickImage();
                image.Ping(Files.CirclePNG, settings);

                Assert.Equal(MagickFormat.Unknown, image.Settings.Format);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }

        public class WithStream
        {
            [Fact]
            public void ShouldThrowExceptionWhenStreamIsNull()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("stream", () => image.Ping((Stream)null!));
            }

            [Fact]
            public void ShouldThrowExceptionWhenStreamIsEmpty()
            {
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("stream", () => image.Ping(new MemoryStream()));
            }

            [Fact]
            public void ShouldThrowExceptionWhenStreamIsNotReadable()
            {
                using var testStream = TestStream.ThatCannotRead();
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("stream", () => image.Ping(testStream));
            }

            [Fact]
            public void ShouldPingImage()
            {
                using var image = new MagickImage();
                using var fileStream = File.OpenRead(Files.SnakewarePNG);
                image.Ping(fileStream);

                Assert.Equal(286U, image.Width);
                Assert.Equal(67U, image.Height);
                Assert.Equal(MagickFormat.Png, image.Format);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldPingImageFromSeekablePartialStream()
            {
                using var image = new MagickImage();
                using var fileStream = File.OpenRead(Files.ImageMagickJPG);
                image.Ping(fileStream);

                fileStream.Position = 0;
                using var partialStream = new PartialStream(fileStream, true);
                using var testImage = new MagickImage();
                testImage.Ping(partialStream);

                Assert.Equal(image.Width, testImage.Width);
                Assert.Equal(image.Height, testImage.Height);
                Assert.Equal(image.Format, testImage.Format);
                Assert.Equal(0.0, image.Compare(testImage, ErrorMetric.RootMeanSquared));
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldPingImageFromNonSeekablePartialStream()
            {
                using var image = new MagickImage();
                using var fileStream = File.OpenRead(Files.ImageMagickJPG);
                image.Ping(fileStream);

                fileStream.Position = 0;
                using var partialStream = new PartialStream(fileStream, false);
                using var testImage = new MagickImage();
                testImage.Ping(partialStream);

                Assert.Equal(image.Width, testImage.Width);
                Assert.Equal(image.Height, testImage.Height);
                Assert.Equal(image.Format, testImage.Format);
                Assert.Equal(0.0, image.Compare(testImage, ErrorMetric.RootMeanSquared));
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }

        public class WithStreamAndMagickReadSettings
        {
            [Fact]
            public void ShouldThrowExceptionWhenStreamIsNull()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentNullException>("stream", () => image.Ping((Stream)null!, settings));
            }

            [Fact]
            public void ShouldThrowExceptionWhenStreamIsEmpty()
            {
                var settings = new MagickReadSettings();
                using var image = new MagickImage();

                Assert.Throws<ArgumentException>("stream", () => image.Ping(new MemoryStream(), settings));
            }

            [Fact]
            public void ShouldNotThrowExceptionWhenSettingsIsNull()
            {
                using var fileStream = File.OpenRead(Files.CirclePNG);
                using var image = new MagickImage();
                image.Ping(fileStream, null);

                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }

            [Fact]
            public void ShouldUseTheCorrectReaderWhenFormatIsSet()
            {
                var bytes = Encoding.ASCII.GetBytes("%PDF-");
                var settings = new MagickReadSettings
                {
                    Format = MagickFormat.Png,
                };
                using var stream = new MemoryStream(bytes);
                using var image = new MagickImage();

                var exception = Assert.Throws<MagickCorruptImageErrorException>(() => image.Ping(stream, settings));
                Assert.Contains("ReadPNGImage", exception.Message);
            }

            [Fact]
            public void ShouldResetTheFormatAfterReadingStream()
            {
                var settings = new MagickReadSettings
                {
                    Format = MagickFormat.Png,
                };

                using var stream = File.OpenRead(Files.CirclePNG);
                using var image = new MagickImage();
                image.Ping(stream, settings);

                Assert.Equal(MagickFormat.Unknown, image.Settings.Format);
                Assert.Throws<InvalidOperationException>(() => image.GetPixelsUnsafe());
            }
        }
    }
}
