using System;
using Paca.Core;
using Xunit;

namespace Paca.Tests.Core;

public class SubtitleBurnInEngineGateTests
{
    [Fact]
    public void Gate357_SubtitleBurnInEngine_BuildsForceStyleString_Correctly()
    {
        var style = new SubtitleBurnInStyle
        {
            FontName = "Arial",
            FontSize = 24,
            PrimaryColor = "&H00FFFFFF",
            OutlineColor = "&H00000000",
            OutlineWidth = 2,
            MarginV = 40,
            Alignment = 2 // Bottom center
        };

        var forceStyle = SubtitleBurnInEngine.BuildForceStyleString(style);

        Assert.Contains("FontName=Arial", forceStyle);
        Assert.Contains("FontSize=24", forceStyle);
        Assert.Contains("PrimaryColour=&H00FFFFFF", forceStyle);
        Assert.Contains("Outline=2", forceStyle);
        Assert.Contains("MarginV=40", forceStyle);
        Assert.Contains("Alignment=2", forceStyle);
    }

    [Fact]
    public void Gate358_SubtitleBurnInEngine_EscapesWindowsPath_ForFfmpegFilter()
    {
        var winPath = "C:\\subtitles\\video_track.srt";
        var escaped = SubtitleBurnInEngine.EscapeSubtitlePathForFfmpeg(winPath);

        // In ffmpeg filtergraph, colon must be escaped as '\:' and backslashes replaced with forward slashes
        Assert.Equal("C\\:/subtitles/video_track.srt", escaped);
    }

    [Fact]
    public void Gate359_SubtitleBurnInEngine_ProvidesDefaultReadableStyle()
    {
        var def = SubtitleBurnInStyle.Default;

        Assert.Equal(22, def.FontSize);
        Assert.Equal(2, def.Alignment); // Bottom center
        Assert.True(def.OutlineWidth >= 2);
    }

    [Fact]
    public void Gate360_SubtitleBurnInEngine_BuildsFullCommandLine_WithAudioCopy()
    {
        var cmd = SubtitleBurnInEngine.BuildBurnInCommandLine(
            inputVideoPath: "C:\\videos\\clip.mp4",
            subtitlePath: "C:\\videos\\clip.srt",
            outputVideoPath: "C:\\videos\\clip_subbed.mp4"
        );

        Assert.Contains("-i \"C:\\videos\\clip.mp4\"", cmd);
        Assert.Contains("-vf \"subtitles='C\\:/videos/clip.srt'", cmd);
        Assert.Contains("force_style=", cmd);
        Assert.Contains("-c:v libx264 -crf 20 -c:a copy", cmd);
        Assert.EndsWith("\"C:\\videos\\clip_subbed.mp4\" -y", cmd);
    }
}