using System;
using Paca.Core;
using Xunit;

namespace Paca.Tests.Core;

public class AudioChannelDownmixerGateTests
{
    [Fact]
    public void Gate329_AudioChannelDownmixer_BuildsStandardItuR775Filter()
    {
        var filter = AudioChannelDownmixer.BuildDownmixFilterArgs(DownmixMode.StandardItuR775);

        Assert.Contains("pan=stereo|FL=0.7071*FL+0.5*FC+0.7071*BL|FR=0.7071*FR+0.5*FC+0.7071*BR", filter);
    }

    [Fact]
    public void Gate330_AudioChannelDownmixer_BuildsNightDialogBoostFilter()
    {
        var filter = AudioChannelDownmixer.BuildDownmixFilterArgs(DownmixMode.NightDialogBoost);

        // Center channel (FC) boosted to 1.0, side noise attenuated
        Assert.Contains("pan=stereo|FL=0.5*FL+1.0*FC+0.3*BL|FR=0.5*FR+1.0*FC+0.3*BR", filter);
    }

    [Fact]
    public void Gate331_AudioChannelDownmixer_BuildsMonoCompatibilityFilter()
    {
        var filter = AudioChannelDownmixer.BuildDownmixFilterArgs(DownmixMode.MonoCompatibility);

        Assert.Contains("pan=mono|c0=0.5*FL+0.5*FR", filter);
    }

    [Fact]
    public void Gate332_AudioChannelDownmixer_BuildsFullCommandLine_WithVideoCopy()
    {
        var cmd = AudioChannelDownmixer.BuildDownmixCommandLine(
            inputPath: "C:\\movies\\surround51.mp4",
            outputPath: "C:\\movies\\stereo_dialog.mp4",
            mode: DownmixMode.NightDialogBoost,
            copyVideo: true
        );

        Assert.Contains("-i \"C:\\movies\\surround51.mp4\"", cmd);
        Assert.Contains("-c:v copy", cmd);
        Assert.Contains("-filter:a \"pan=stereo|FL=0.5*FL+1.0*FC+0.3*BL|FR=0.5*FR+1.0*FC+0.3*BR\"", cmd);
        Assert.Contains("-c:a aac -b:a 192k", cmd);
        Assert.EndsWith("\"C:\\movies\\stereo_dialog.mp4\" -y", cmd);
    }
}