// Copyright (c) homuler and The Vignette Authors
// This file is part of MediaPipe.NET.
// MediaPipe.NET is licensed under the MIT License. See LICENSE for details.

using System;
using System.Linq;
using Mediapipe.Net.Core;
using Mediapipe.Net.Framework.Format;
using Mediapipe.Net.Framework.Protobuf;
using Mediapipe.Net.Tests;
using NUnit.Framework;

namespace Mediapipe.Tests
{
    public class ImageFrameTest
    {
        #region Constructor
        [Test]
        public unsafe void Ctor_ShouldInstantiateImageFrame_When_CalledWithNoArguments()
        {
            using var imageFrame = new ImageFrame();
            Assert.AreEqual(ImageFormat.Types.Format.Unknown, imageFrame.Format());
            Assert.AreEqual(0, imageFrame.Width());
            Assert.AreEqual(0, imageFrame.Height(), 0);
            Assert.AreEqual(0, imageFrame.ChannelSize());
            Assert.AreEqual(0, imageFrame.NumberOfChannels());
            Assert.AreEqual(0, imageFrame.ByteDepth());
            Assert.AreEqual(0, imageFrame.WidthStep());
            Assert.AreEqual(0, imageFrame.PixelDataSize());
            Assert.AreEqual(0, imageFrame.PixelDataSizeStoredContiguously());
            Assert.True(imageFrame.IsEmpty());
            Assert.False(imageFrame.IsContiguous());
            Assert.False(imageFrame.IsAligned(16));
            Assert.AreEqual(IntPtr.Zero, imageFrame.MutablePixelData());
        }

        [Test]
        public unsafe void Ctor_ShouldInstantiateImageFrame_When_CalledWithFormat()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Sbgra, 640, 480);
            Assert.AreEqual(ImageFormat.Types.Format.Sbgra, imageFrame.Format());
            Assert.AreEqual(640, imageFrame.Width());
            Assert.AreEqual(480, imageFrame.Height());
            Assert.AreEqual(1, imageFrame.ChannelSize());
            Assert.AreEqual(4, imageFrame.NumberOfChannels());
            Assert.AreEqual(1, imageFrame.ByteDepth());
            Assert.AreEqual(640 * 4, imageFrame.WidthStep());
            Assert.AreEqual(640 * 480 * 4, imageFrame.PixelDataSize());
            Assert.AreEqual(640 * 480 * 4, imageFrame.PixelDataSizeStoredContiguously());
            Assert.False(imageFrame.IsEmpty());
            Assert.True(imageFrame.IsContiguous());
            Assert.True(imageFrame.IsAligned(16));
            Assert.AreNotEqual(IntPtr.Zero, imageFrame.MutablePixelData());
        }

        [Test]
        public void Ctor_ShouldInstantiateImageFrame_When_CalledWithFormatAndAlignmentBoundary()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray8, 100, 100, 8);
            Assert.AreEqual(100, imageFrame.Width());
            Assert.AreEqual(1, imageFrame.NumberOfChannels());
            Assert.AreEqual(104, imageFrame.WidthStep());
        }

        [Test]
        public void Ctor_ShouldInstantiateImageFrame_When_CalledWithPixelData()
        {
            byte[] srcBytes = new byte[] {
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
                16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
            };

            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Sbgra, 4, 2, 16, srcBytes);
            Assert.AreEqual(4, imageFrame.Width());
            Assert.AreEqual(2, imageFrame.Height());
            Assert.False(imageFrame.IsEmpty());

            byte[] bytes = new byte[32];
            imageFrame.CopyToBuffer(bytes);
            Assert.IsEmpty(bytes.Where((x, i) => x != srcBytes[i]));
        }


        [Test, SignalAbort]
        public void Ctor_ShouldThrowMediaPipeException_When_CalledWithInvalidArgument()
        {
#pragma warning disable IDE0058
            Assert.Throws<MediapipeException>(() => { new ImageFrame(ImageFormat.Types.Format.Sbgra, 640, 480, 0); });
#pragma warning restore IDE0058
        }
        #endregion

        #region #isDisposed
        [Test]
        public void IsDisposed_ShouldReturnFalse_When_NotDisposedYet()
        {
            using ImageFrame imageFrame = new ImageFrame();
            Assert.False(imageFrame.IsDisposed);
        }

        [Test]
        public void IsDisposed_ShouldReturnTrue_When_AlreadyDisposed()
        {
            ImageFrame imageFrame = new ImageFrame();
            imageFrame.Dispose();

            Assert.True(imageFrame.IsDisposed);
        }
        #endregion

        #region #SetToZero
        [Test]
        public void SetToZero_ShouldSetZeroToAllBytes()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray8, 10, 10);
            imageFrame.SetToZero();
            var bytes = new byte[100];
            imageFrame.CopyToBuffer(bytes);
            Assert.True(bytes.All((x) => x == 0));
        }
        #endregion

        #region #SetAlignmentPaddingAreas
        [Test]
        public void SetAlignmentPaddingAreas_ShouldNotThrow()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray8, 10, 10, 16);
            Assert.DoesNotThrow(() => { imageFrame.SetAlignmentPaddingAreas(); });
        }
        #endregion

        #region CopyToBuffer
        [Test, SignalAbort]
        public void CopyToByteBuffer_ShouldThrowException_When_BufferDepthIsWrong()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray16, 10, 10);
#pragma warning disable IDE0058
            Assert.Throws<MediapipeException>(() => { imageFrame.CopyToBuffer(new byte[100]); });
#pragma warning restore IDE0058
        }

        [Test]
        public void CopyToByteBuffer_ShouldReturnByteArray_When_BufferSizeIsLargeEnough()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray8, 10, 10);
            var normalBuffer = new byte[100];
            var largeBuffer = new byte[120];
            imageFrame.CopyToBuffer(normalBuffer);
            imageFrame.CopyToBuffer(largeBuffer);

            Assert.IsEmpty(normalBuffer.Where((x, i) => x != largeBuffer[i]));
        }

        [Test, SignalAbort]
        public void CopyToByteBuffer_ShouldThrowException_When_BufferSizeIsTooSmall()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray8, 10, 10);
#pragma warning disable IDE0058
            Assert.Throws<MediapipeException>(() => { imageFrame.CopyToBuffer(new byte[99]); });
#pragma warning restore IDE0058
        }

        [Test, SignalAbort]
        public void CopyToUshortBuffer_ShouldThrowException_When_BufferDepthIsWrong()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray8, 10, 10);
#pragma warning disable IDE0058
            Assert.Throws<MediapipeException>(() => { imageFrame.CopyToBuffer(new ushort[100]); });
#pragma warning restore IDE0058
        }

        [Test]
        public void CopyToUshortBuffer_ShouldReturnUshortArray_When_BufferSizeIsLargeEnough()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray16, 10, 10);
            var normalBuffer = new ushort[100];
            var largeBuffer = new ushort[120];
            imageFrame.CopyToBuffer(normalBuffer);
            imageFrame.CopyToBuffer(largeBuffer);

            Assert.IsEmpty(normalBuffer.Where((x, i) => x != largeBuffer[i]));
        }

        [Test, SignalAbort]
        public void CopyToUshortBuffer_ShouldThrowException_When_BufferSizeIsTooSmall()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray16, 10, 10);
#pragma warning disable IDE0058
            Assert.Throws<MediapipeException>(() => { imageFrame.CopyToBuffer(new ushort[99]); });
#pragma warning restore IDE0058
        }

        [Test, SignalAbort]
        public void CopyToFloatBuffer_ShouldThrowException_When_BufferDepthIsWrong()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Gray8, 10, 10);
#pragma warning disable IDE0058
            Assert.Throws<MediapipeException>(() => { imageFrame.CopyToBuffer(new float[100]); });
#pragma warning restore IDE0058
        }

        [Test]
        public void CopyToFloatBuffer_ShouldReturnFloatArray_When_BufferSizeIsLargeEnough()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Vec32F1, 10, 10);
            var normalBuffer = new float[100];
            var largeBuffer = new float[120];
            imageFrame.CopyToBuffer(normalBuffer);
            imageFrame.CopyToBuffer(largeBuffer);

            Assert.IsEmpty(normalBuffer.Where((x, i) => Math.Abs(x - largeBuffer[i]) > 1e-9));
        }

        [Test, SignalAbort]
        public void CopyToFloatBuffer_ShouldThrowException_When_BufferSizeIsTooSmall()
        {
            using var imageFrame = new ImageFrame(ImageFormat.Types.Format.Vec32F1, 10, 10);
#pragma warning disable IDE0058
            Assert.Throws<MediapipeException>(() => { imageFrame.CopyToBuffer(new float[99]); });
#pragma warning restore IDE0058
        }
    }
    #endregion
}