using System;
using System.Globalization;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;

namespace MelonVPNCore
{
    // I hate overhead but this code is just nice xD

    // Base json class with type property FromJson and ToJson methods
    public class JsonBase
    {
        [JsonProperty("type")]
        public string Type { get; set; }

        // Convert from json string to WSJson class
        public static JsonBase FromJson(string json) => JsonConvert.DeserializeObject<JsonBase>(json, Converter.Settings);

        // Convert any class into a json string
        public string ToJson() => JsonConvert.SerializeObject(this, Converter.Settings);

        // Converter with settings
        internal static class Converter
        {
            public static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
            {
                MetadataPropertyHandling = MetadataPropertyHandling.Ignore,
                DateParseHandling = DateParseHandling.None,
                Converters =
                {
                    new IsoDateTimeConverter{DateTimeStyles=DateTimeStyles.AssumeUniversal }
                }
            };
        }
    }

    // Base class for custom json with a type argument
    public class JsonBase<T> : JsonBase
    {
        // Convert from json string to T class
        public static new T FromJson(string json) => JsonConvert.DeserializeObject<T>(json, Converter.Settings);

        // Used to convert json property into type long
        internal class ParseStringConverter : JsonConverter
        {
            public override bool CanConvert(Type objectType) { return objectType == typeof(long) || objectType == typeof(long); }

            public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
            {
                if (reader.TokenType == JsonToken.Null) return null;
                var value = serializer.Deserialize<string>(reader);
                if (long.TryParse(value, out long l)) return l;
                throw new Exception("Cannot unmarshal type long");
            }

            public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
            {
                if (value == null)
                {
                    serializer.Serialize(writer, null);
                    return;
                }
                var v = (long)value;
                serializer.Serialize(writer, v.ToString());
                return;
            }

            public static readonly ParseStringConverter Singleton = new ParseStringConverter();
        }
    }

    // Class for the daemon config
    public class DaemonConfig : JsonBase<DaemonConfig>
    {
        public DaemonConfig() => Type = "DaemonConfig";

        [JsonProperty("restart")]
        public bool ShouldRestart { get; set; }
    }
}