releases/tests/Paca.Tests/Core/VideoEnginesExtremeRedTests.cs

using System;
using Paca.Core;
using Xunit;

namespace Paca.Tests.Core;

public class VideoEnginesExtremeRedTests
{
    private const string SampleInput = "C:\\Videos\\input.mp4";
    private const string SampleOutput = "C:\\Videos\\output.mp4";

    // ==========================================
    // 1. VideoAspectAutoCropper
    // ==========================================

    [Fact]
    public void VideoAspectAutoCropper_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
    {
        Assert.Throws<InvalidOperationException>(() =>
            VideoAspectAutoCropper.BuildReframingCommandLine(SampleInput, SampleInput, ReframingMode.CenterCrop));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    [InlineData("", SampleOutput)]
    [InlineData(SampleInput, "   ")]
    public void VideoAspectAutoCropper_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
    {
        Assert.Throws<ArgumentException>(() =>
            VideoAspectAutoCropper.BuildReframingCommandLine(inPath!, outPath!, ReframingMode.CenterCrop));
    }

    // ==========================================
    // 2. VideoIntroOutroTrimmer
    // ==========================================

    [Fact]
    public void VideoIntroOutroTrimmer_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
    {
        Assert.Throws<InvalidOperationException>(() =>
            VideoIntroOutroTrimmer.BuildLosslessTrimCommandLine(SampleInput, SampleInput, 0, 10));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    public void VideoIntroOutroTrimmer_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
    {
        Assert.Throws<ArgumentException>(() =>
            VideoIntroOutroTrimmer.BuildLosslessTrimCommandLine(inPath!, outPath!, 0, 10));
    }

    [Fact]
    public void VideoIntroOutroTrimmer_BuildCommandLine_NegativeStartOrDuration_ClampsToSafeBounds()
    {
        var cmd = VideoIntroOutroTrimmer.BuildLosslessTrimCommandLine(SampleInput, SampleOutput, -10.5, -5.0);
        Assert.NotNull(cmd);
        Assert.Contains("-ss 0.00", cmd);
        Assert.DoesNotContain("-t -", cmd);
    }

    // ==========================================
    // 3. VideoPosterExtractor
    // ==========================================

    [Fact]
    public void VideoPosterExtractor_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
    {
        var spec = new PosterExtractionSpec(5.0, 640, 360, PosterFormat.Jpeg);
        Assert.Throws<InvalidOperationException>(() =>
            VideoPosterExtractor.BuildPosterCommandLine(SampleInput, SampleInput, spec));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    public void VideoPosterExtractor_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
    {
        var spec = new PosterExtractionSpec(5.0, 640, 360, PosterFormat.Jpeg);
        Assert.Throws<ArgumentException>(() =>
            VideoPosterExtractor.BuildPosterCommandLine(inPath!, outPath!, spec));
    }

    // ==========================================
    // 4. VideoSpriteSheetGenerator
    // ==========================================

    [Fact]
    public void VideoSpriteSheetGenerator_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
    {
        var config = new SpriteSheetConfig(5, 5, 160, 90, 10);
        Assert.Throws<InvalidOperationException>(() =>
            VideoSpriteSheetGenerator.BuildFfmpegSpriteCommandLine(SampleInput, SampleInput, config));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    public void VideoSpriteSheetGenerator_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
    {
        var config = new SpriteSheetConfig(5, 5, 160, 90, 10);
        Assert.Throws<ArgumentException>(() =>
            VideoSpriteSheetGenerator.BuildFfmpegSpriteCommandLine(inPath!, outPath!, config));
    }

    // ==========================================
    // 5. VideoFrameRateConverter
    // ==========================================

    [Fact]
    public void VideoFrameRateConverter_BuildFfmpegArgs_SameInputAndOutput_ThrowsInvalidOperationException()
    {
        Assert.Throws<InvalidOperationException>(() =>
            VideoFrameRateConverter.BuildFfmpegArgs(SampleInput, SampleInput, 60, FrameRateConversionMode.Simple));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    public void VideoFrameRateConverter_BuildFfmpegArgs_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
    {
        Assert.Throws<ArgumentException>(() =>
            VideoFrameRateConverter.BuildFfmpegArgs(inPath!, outPath!, 60, FrameRateConversionMode.Simple));
    }

    [Fact]
    public void VideoFrameRateConverter_BuildFfmpegArgs_ExtremeFpsAndCrf_ClampedToValidRange()
    {
        var cmd = VideoFrameRateConverter.BuildFfmpegArgs(SampleInput, SampleOutput, 1000, FrameRateConversionMode.Simple, crf: 99);
        Assert.NotNull(cmd);
        Assert.Contains("fps=240", cmd);
        Assert.Contains("-crf 51", cmd);
    }

    // ==========================================
    // 6. VideoDenoiseEnhancer
    // ==========================================

    [Fact]
    public void VideoDenoiseEnhancer_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
    {
        Assert.Throws<InvalidOperationException>(() =>
            VideoDenoiseEnhancer.BuildDenoiseCommandLine(SampleInput, SampleInput, true, true));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    public void VideoDenoiseEnhancer_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
    {
        Assert.Throws<ArgumentException>(() =>
            VideoDenoiseEnhancer.BuildDenoiseCommandLine(inPath!, outPath!, true, true));
    }

    [Fact]
    public void VideoEngines_PathsWithQuotes_EscapedOrStrippedSafely()
    {
        string maliciousIn = "C:\\test\\in\"jection.mp4";
        string maliciousOut = "C:\\test\\out\"jection.mp4";

        var cmd = VideoAspectAutoCropper.BuildReframingCommandLine(maliciousIn, maliciousOut, ReframingMode.CenterCrop);
        Assert.NotNull(cmd);
        Assert.DoesNotContain("in\"jection", cmd);
        Assert.DoesNotContain("out\"jection", cmd);
    }
}