using System;
using System.Collections.Generic;
using Paca.Core;
using Xunit;

namespace Paca.Tests.Core;

public class VideoIntroOutroTrimmerGateTests
{
    [Fact]
    public void Gate373_VideoIntroOutroTrimmer_ParsesSilenceSpans_FromFfmpegStderr()
    {
        var stderr = @"
[silencedetect @ 0000021c1c68f140] silence_start: 0
[silencedetect @ 0000021c1c68f140] silence_end: 4.2 | silence_duration: 4.2
[silencedetect @ 0000021c1c68f140] silence_start: 115.8
[silencedetect @ 0000021c1c68f140] silence_end: 120.0 | silence_duration: 4.2
";

        var spans = VideoIntroOutroTrimmer.ParseSilenceSpans(stderr);

        Assert.Equal(2, spans.Count);
        Assert.Equal(0.0, spans[0].StartSec);
        Assert.Equal(4.2, spans[0].EndSec);
        Assert.Equal(4.2, spans[0].DurationSec);

        Assert.Equal(115.8, spans[1].StartSec);
        Assert.Equal(120.0, spans[1].EndSec);
    }

    [Fact]
    public void Gate374_VideoIntroOutroTrimmer_CalculatesPlaybackTrimWindow()
    {
        var totalDuration = 180.0; // 3 minutes
        var skipIntro = 10.0;     // Skip first 10s
        var skipOutro = 20.0;     // Skip last 20s

        var window = VideoIntroOutroTrimmer.CalculateTrimWindow(totalDuration, skipIntro, skipOutro);

        Assert.Equal(10.0, window.StartSec);
        Assert.Equal(160.0, window.EndSec);
        Assert.Equal(150.0, window.DurationSec);
    }

    [Fact]
    public void Gate375_VideoIntroOutroTrimmer_ClampsExcessiveSkips_ToMinimumOneSecond()
    {
        var totalDuration = 30.0;
        var excessiveIntro = 25.0;
        var excessiveOutro = 20.0; // sum = 45 > 30

        var window = VideoIntroOutroTrimmer.CalculateTrimWindow(totalDuration, excessiveIntro, excessiveOutro);

        // Should clamp so duration is at least 1.0s
        Assert.True(window.DurationSec >= 1.0);
        Assert.True(window.EndSec <= totalDuration);
    }

    [Fact]
    public void Gate376_VideoIntroOutroTrimmer_BuildsLosslessTrimCommandLine()
    {
        var cmd = VideoIntroOutroTrimmer.BuildLosslessTrimCommandLine(
            inputPath: "C:\\videos\\full.mp4",
            outputPath: "C:\\videos\\trimmed.mp4",
            startSec: 10.5,
            durationSec: 150.0
        );

        Assert.Contains("-ss 10.50 -i \"C:\\videos\\full.mp4\"", cmd);
        Assert.Contains("-t 150.00", cmd);
        Assert.Contains("-c copy", cmd);
        Assert.EndsWith("\"C:\\videos\\trimmed.mp4\" -y", cmd);
    }
}