using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Dpz.Core.Service.ObjectStorage.VideoHandle;

public class AvOptsConverter : JsonConverter<AvOpts>
{
    public override AvOpts? Read(
        ref Utf8JsonReader reader,
        Type typeToConvert,
        JsonSerializerOptions options
    )
    {
        var value = reader.GetString();
        if (!string.IsNullOrEmpty(value))
        {
            var buffer = new byte[
                (value.Length * 3 + 3) / 4
                    - (
                        value.Length > 0 && value[^1] == '='
                            ? value.Length > 1 && value[^2] == '='
                                ? 2
                                : 1
                            : 0
                    )
            ];
            var bytes = Convert.TryFromBase64String(value, buffer, out _) ? buffer : [];
            var json = Encoding.UTF8.GetString(bytes);
            try
            {
                var list = JsonSerializer.Deserialize<List<OptionType>>(json) ?? [];
                return new AvOpts(list);
            }
            catch (Exception)
            {
                // ignored
            }
        }

        return [];
    }

    public override void Write(Utf8JsonWriter writer, AvOpts value, JsonSerializerOptions options)
    {

        writer.WriteStringValue(value.ToString());
    }
}