using System;
using System.Linq;
using System.Text.Json;
using System.Text.Json.Serialization;
using Wabbajack.Hashing.xxHash64;
using Wabbajack.Paths;

namespace Wabbajack.DTOs.JsonConverters
{
    public class HashRelativePathConverter : JsonConverter<HashRelativePath>
    {
        public override HashRelativePath Read(ref Utf8JsonReader reader, Type typeToConvert,
            JsonSerializerOptions options)
        {
            var parts = JsonSerializer.Deserialize<string[]>(ref reader)!;
            var hash = Hash.FromBase64(parts[0]);
            return new HashRelativePath(hash,
                (parts[1..] ?? Array.Empty<string>()).Select(r => (RelativePath)r).ToArray());
        }

        public override void Write(Utf8JsonWriter writer, HashRelativePath value, JsonSerializerOptions options)
        {
            writer.WriteStartArray();
            Span<byte> temp = stackalloc byte[12];
            value.Hash.ToBase64(temp);
            writer.WriteStringValue(temp);

            foreach (var part in value.Parts)
                writer.WriteStringValue(part.ToString());

            writer.WriteEndArray();
        }
    }
}