using System.Text;
using System.Text.Json;
using CoreAgent.WebSocketTransport.Interfaces;

namespace CoreAgent.WebSocketTransport.Services;

/// <summary>
/// JSON 消息序列化器
/// 单一职责：负责消息的序列化和反序列化
/// </summary>
public class JsonMessageSerializer : IMessageSerializer
{
    private readonly JsonSerializerOptions _options;

    public JsonMessageSerializer(JsonSerializerOptions? options = null)
    {
        _options = options ?? new JsonSerializerOptions
        {
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
            WriteIndented = false
        };
    }

    public byte[] Serialize<T>(T message)
    {
        if (message == null)
        {
            throw new ArgumentNullException(nameof(message));
        }

        var json = JsonSerializer.Serialize(message, _options);
        return Encoding.UTF8.GetBytes(json);
    }

    public T? Deserialize<T>(byte[] data)
    {
        if (data == null || data.Length == 0)
        {
            return default;
        }

        var json = Encoding.UTF8.GetString(data);
        return JsonSerializer.Deserialize<T>(json, _options);
    }

    public T? Deserialize<T>(string json)
    {
        if (string.IsNullOrEmpty(json))
        {
            return default;
        }

        return JsonSerializer.Deserialize<T>(json, _options);
    }
}