FFMpegCore/FFMpegCore/FFMpeg/Arguments/PadArgument.cs

using FFMpegCore.Extend;

namespace FFMpegCore.Arguments;

public class PadArgument : IVideoFilterArgument
{
    private readonly PadOptions _options;

    public PadArgument(PadOptions options)
    {
        _options = options;
    }

    public string Key => "pad";
    public string Value => _options.TextInternal;
}

public class PadOptions
{
    public readonly Dictionary<string, string> Parameters = new();

    private PadOptions(string? width, string? height)
    {
        if (width == null && height == null)
        {
            throw new Exception("At least one of the parameters must be not null");
        }

        if (width != null)
        {
            Parameters.Add("width", width);
        }

        if (height != null)
        {
            Parameters.Add("height", height);
        }
    }

    private PadOptions(string aspectRatio)
    {
        Parameters.Add("aspect", aspectRatio);
    }

    internal string TextInternal => string.Join(":", Parameters.Select(parameter => parameter.FormatArgumentPair(true)));

    public static PadOptions Create(string? width, string? height)
    {
        return new PadOptions(width, height);
    }

    public static PadOptions Create(string aspectRatio)
    {
        return new PadOptions(aspectRatio);
    }

    public PadOptions WithParameter(string key, string value)
    {
        Parameters.Add(key, value);
        return this;
    }
}