using BenchmarkDotNet.Attributes;
using MicroBenchmarks;
using System.Buffers;
using System.Threading.Tasks;

namespace System.Text.Json.Serialization.Tests
{
    public struct JsonMessage
    {
        public string message { get; set; }
    }

    public class TechEmPower
    {
        private static readonly JsonSerializerOptions SerializerOptions = new JsonSerializerOptions();

        ArrayBufferWriter<byte> _bufferWriter = new ArrayBufferWriter<byte>(160 * 16);
        Utf8JsonWriter _utf8Jsonwriter;


        [GlobalSetup]
        public void Setup()
        {
            _utf8Jsonwriter = new Utf8JsonWriter(_bufferWriter, new JsonWriterOptions { SkipValidation = true });
        }

        [BenchmarkCategory(Categories.Libraries, Categories.JSON)]
        [Benchmark]
        public void SerializeWithCachedBuffer()
        {
            _bufferWriter.Clear();
            var utf8JsonWriter = new Utf8JsonWriter(_bufferWriter, new JsonWriterOptions { SkipValidation = true });
            JsonSerializer.Serialize<JsonMessage>(utf8JsonWriter, new JsonMessage { message = "Hello, World!" }, SerializerOptions);
        }

        [BenchmarkCategory(Categories.Libraries, Categories.JSON)]
        [Benchmark]
        public void SerializeWithCachedBufferAndWriter()
        {
            _bufferWriter.Clear();
            JsonSerializer.Serialize<JsonMessage>(_utf8Jsonwriter, new JsonMessage { message = "Hello, World!" }, SerializerOptions);
        }

        [BenchmarkCategory(Categories.Libraries, Categories.JSON)]
        [Benchmark]
        public void SerializeWithManualCode()
        {
            _bufferWriter.Clear();
            using (var utf8JsonWriter = new Utf8JsonWriter(_bufferWriter))
            {
                var message = new JsonMessage { message = "Hello, World!" };
                utf8JsonWriter.WriteStartObject();
                utf8JsonWriter.WriteString("message", message.message);
                utf8JsonWriter.WriteEndObject();
            }
        }
    }
}