using System;
using System.IO;
using System.Text.Encodings.Web;
using System.Text.Json;
using System.Text.Json.Serialization;
using Flurl.Http.Configuration;

namespace SKIT.FlurlHttpClient.Wechat
{
    public class FlurlSystemTextJsonSerializer : ISerializer
    {
        private readonly JsonSerializerOptions _options;

        public FlurlSystemTextJsonSerializer()
            : this(GetDefaultSerializerOptions())
        {
        }

        public FlurlSystemTextJsonSerializer(JsonSerializerOptions options)
        {
            if (options == null) throw new ArgumentNullException(nameof(options));

            _options = options;
        }

        public static JsonSerializerOptions GetDefaultSerializerOptions()
        {
            var jsonOptions = new JsonSerializerOptions();
            jsonOptions.Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping;
            jsonOptions.NumberHandling = JsonNumberHandling.AllowReadingFromString;
            jsonOptions.IgnoreNullValues = true;
            jsonOptions.WriteIndented = false;
            jsonOptions.PropertyNamingPolicy = null;
            jsonOptions.PropertyNameCaseInsensitive = true;
            return jsonOptions;
        }

        public T Deserialize<T>(string json)
        {
            return JsonSerializer.Deserialize<T>(json, _options)!;
        }

        T ISerializer.Deserialize<T>(Stream stream)
        {
            if (stream.CanSeek)
            {
                stream.Seek(0, SeekOrigin.Begin);
            }

            using (var reader = new StreamReader(stream))
            {
                string json = reader.ReadToEnd();
                return Deserialize<T>(json);
            }
        }

        public object Deserialize(string json, Type type)
        {
            return JsonSerializer.Deserialize(json, type, _options)!;
        }

        public string Serialize<T>(T obj)
        {
            return JsonSerializer.Serialize(obj, _options);
        }

        public string Serialize(object obj)
        {
            return JsonSerializer.Serialize(obj, _options);
        }

        public string Serialize(object obj, Type type)
        {
            return JsonSerializer.Serialize(obj, type, _options);
        }
    }
}