using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Paca.Core.Platform;
using Xunit;

namespace Paca.Tests.Platform;

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

    // ==========================================
    // 1. VrSpatialAudioEngine
    // ==========================================

    [Fact]
    public async Task VrSpatialAudioEngine_InjectVrMetadataAsync_SameInputAndOutput_ThrowsArgumentException()
    {
        var engine = new VrSpatialAudioEngine(DesktopProcessRunner.Default);
        var meta = new VrSpatialMetadata("equirectangular", "mono", 1);
        await Assert.ThrowsAsync<ArgumentException>(() =>
            engine.InjectVrMetadataAsync("ffmpeg.exe", SampleInput, SampleInput, meta, CancellationToken.None));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    [InlineData("", SampleOutput)]
    [InlineData(SampleInput, "   ")]
    public async Task VrSpatialAudioEngine_InjectVrMetadataAsync_NullOrWhitespacePaths_ThrowsArgumentException(string? inPath, string? outPath)
    {
        var engine = new VrSpatialAudioEngine(DesktopProcessRunner.Default);
        var meta = new VrSpatialMetadata("equirectangular", "mono", 1);
        await Assert.ThrowsAsync<ArgumentException>(() =>
            engine.InjectVrMetadataAsync("ffmpeg.exe", inPath!, outPath!, meta, CancellationToken.None));
    }

    // ==========================================
    // 2. VoiceActivitySubtitleAdapter
    // ==========================================

    [Fact]
    public void VoiceActivitySubtitleAdapter_GenerateVttSkeleton_ListWithNullSegment_SkipsSafely()
    {
        var list = new List<SpeechSegment>
        {
            null!,
            new(0.0, 5.0),
            null!
        };

        var vtt = VoiceActivitySubtitleAdapter.GenerateVttSkeleton(list);
        Assert.NotNull(vtt);
        Assert.Contains("WEBVTT", vtt);
        Assert.Contains("00:00:00.000 --> 00:00:05.000", vtt);
    }

    [Theory]
    [InlineData(double.NaN)]
    [InlineData(-5.0)]
    public void VoiceActivitySubtitleAdapter_FormatTimecode_NegativeOrNaN_ReturnsZeroTimecode(double sec)
    {
        var code = VoiceActivitySubtitleAdapter.FormatTimecode(sec);
        Assert.Equal("00:00:00.000", code);
    }

    // ==========================================
    // 3. HighlightShortsClipper
    // ==========================================

    [Fact]
    public async Task HighlightShortsClipper_ExportShortsClipAsync_SameInputAndOutput_ThrowsArgumentException()
    {
        var clipper = new HighlightShortsClipper(DesktopProcessRunner.Default);
        var clip = new HighlightClip(0.0, 15.0, "Test", 7.5);
        await Assert.ThrowsAsync<ArgumentException>(() =>
            clipper.ExportShortsClipAsync("ffmpeg.exe", SampleInput, SampleInput, clip, false, CancellationToken.None));
    }

    [Fact]
    public async Task HighlightShortsClipper_ExportShortsClipAsync_NullClip_ThrowsArgumentNullException()
    {
        var clipper = new HighlightShortsClipper(DesktopProcessRunner.Default);
        await Assert.ThrowsAsync<ArgumentNullException>(() =>
            clipper.ExportShortsClipAsync("ffmpeg.exe", SampleInput, SampleOutput, null!, false, CancellationToken.None));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    [InlineData("", SampleOutput)]
    [InlineData(SampleInput, "   ")]
    public async Task HighlightShortsClipper_ExportShortsClipAsync_NullOrWhitespacePaths_ThrowsArgumentException(string? inPath, string? outPath)
    {
        var clipper = new HighlightShortsClipper(DesktopProcessRunner.Default);
        var clip = new HighlightClip(0.0, 15.0, "Test", 7.5);
        await Assert.ThrowsAsync<ArgumentException>(() =>
            clipper.ExportShortsClipAsync("ffmpeg.exe", inPath!, outPath!, clip, false, CancellationToken.None));
    }

    [Fact]
    public void HighlightShortsClipper_DetectHighlightWindows_ListWithNullSamples_SkipsSafely()
    {
        var samples = new List<VolumeSample>
        {
            null!,
            new(10.0, -5.0),
            null!,
            new(30.0, -2.0)
        };

        var clips = HighlightShortsClipper.DetectHighlightWindows(samples, windowDurationSec: 10.0, topCount: 2);
        Assert.NotNull(clips);
        Assert.Equal(2, clips.Count);
    }
}