using System;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Mqtt.Models
{
    public class HTTPBody
    {
        [JsonConverter(typeof(DictionaryStringObjectJsonConverter))]
        public Dictionary<string, object> data { get; set; }
    }

    public class DictionaryStringObjectJsonConverter : JsonConverter<Dictionary<string, object>>
    {
        public override Dictionary<string, object> Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            if (reader.TokenType != JsonTokenType.StartObject)
            {
                throw new JsonException($"JsonTokenType was of type {reader.TokenType}, only objects are supported");
            }

            Dictionary<string, object> dictionary = new Dictionary<string, object>();
            while (reader.Read())
            {
                if (reader.TokenType == JsonTokenType.EndObject)
                {
                    return dictionary;
                }

                if (reader.TokenType != JsonTokenType.PropertyName)
                {
                    throw new JsonException("JsonTokenType was not PropertyName");
                }

                string @string = reader.GetString();
                if (string.IsNullOrWhiteSpace(@string))
                {
                    throw new JsonException("Failed to get property name");
                }

                reader.Read();
                dictionary.Add(@string, ExtractValue(ref reader, options));
            }

            return dictionary;
        }

        public override void Write(Utf8JsonWriter writer, Dictionary<string, object> value, JsonSerializerOptions options)
        {
            JsonSerializer.Serialize(writer, value, options);
        }

        private object ExtractValue(ref Utf8JsonReader reader, JsonSerializerOptions options)
        {
            switch (reader.TokenType)
            {
                case JsonTokenType.String:
                    {
                        if (reader.TryGetDateTime(out var value2))
                        {
                            return value2;
                        }

                        return reader.GetString();
                    }
                case JsonTokenType.False:
                    return false;
                case JsonTokenType.True:
                    return true;
                case JsonTokenType.Null:
                    return null;
                case JsonTokenType.Number:
                    {
                        if (reader.TryGetInt64(out var value))
                        {
                            return value;
                        }

                        return reader.GetDecimal();
                    }
                case JsonTokenType.StartObject:
                    return Read(ref reader, null, options);
                case JsonTokenType.StartArray:
                    {
                        List<object> list = new List<object>();
                        while (reader.Read() && reader.TokenType != JsonTokenType.EndArray)
                        {
                            list.Add(ExtractValue(ref reader, options));
                        }

                        return list;
                    }
                default:
                    throw new JsonException($"'{reader.TokenType}' is not supported");
            }
        }
    }
}