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

using System.Text.Json;

/// <summary>Basis JSON converter.</summary>
public class Texture2DConverter : JsonConverter<Texture2D>
{
  /// <inheritdoc />
  public override bool CanConvert(Type typeToConvert) =>
    typeToConvert == typeof(Texture2D);

  /// <inheritdoc />
  public override Texture2D Read(
    ref Utf8JsonReader reader,
    Type typeToConvert,
    JsonSerializerOptions options)
  {
    var texture2D = new Texture2D();

    while (reader.Read())
    {
      if (reader.TokenType == JsonTokenType.EndObject)
      {
        return texture2D;
      }

      if (reader.TokenType != JsonTokenType.PropertyName)
      {
        continue;
      }

      var propertyName = reader.GetString();
      reader.Read();

      switch (propertyName)
      {
        case "resource_path":
          var resourcePath = JsonSerializer.Deserialize<string>(ref reader, options);
          texture2D = GD.Load<Texture2D>(resourcePath);
          break;
        default:
          break;
      }
    }

    throw new JsonException("Unexpected end when reading Texture2D.");

  }

  /// <inheritdoc />
  public override void Write(
    Utf8JsonWriter writer,
    Texture2D value,
    JsonSerializerOptions options
  )
  {
    var resolver = options.TypeInfoResolver;
    var resourcePathType = resolver!.GetTypeInfo(typeof(string), options)!;

    writer.WriteStartObject();
    writer.WritePropertyName("resource_path");
    JsonSerializer.Serialize(writer, value.ResourcePath, resourcePathType);
    writer.WriteEndObject();
  }
}