// /**
//  * File: JSONMapper.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using System.Reflection;
using System.Collections.Generic;
using System.Collections;
using System.Diagnostics.Tracing;
namespace ln.json.mapping
{
    public class JSONMapper
    {
        public static JSONMapper DefaultMapper { get; set; } = new JSONMapper(true);

        Dictionary<Type, JSONMapping> mappings = new Dictionary<Type, JSONMapping>();

        public JSONMapper()
        {
        }
        private JSONMapper(bool defaultMapper)
        {
            /**
             * Integer
             **/
            Add(new JSONMapping(
                typeof(byte),
                (JSONMapper arg1, object arg2) => new JSONNumber((int)arg2),
                (JSONMapper arg1, JSONValue arg2) => Decimal.ToByte(((JSONNumber)arg2).Decimal)
                ));
            Add(new JSONMapping(
                typeof(short),
                (JSONMapper arg1, object arg2) => new JSONNumber((int)arg2),
                (JSONMapper arg1, JSONValue arg2) => Decimal.ToInt16(((JSONNumber)arg2).Decimal)
                ));
            Add(new JSONMapping(
                typeof(int),
                (JSONMapper arg1, object arg2) => new JSONNumber((int)arg2),
                (JSONMapper arg1, JSONValue arg2) => Decimal.ToInt32(((JSONNumber)arg2).Decimal)
                ));
            Add(new JSONMapping(
                typeof(long),
                (JSONMapper arg1, object arg2) => new JSONNumber((long)arg2),
                (JSONMapper arg1, JSONValue arg2) => Decimal.ToInt64(((JSONNumber)arg2).Decimal)
                ));
            Add(new JSONMapping(
                typeof(ushort),
                (JSONMapper arg1, object arg2) => new JSONNumber((uint)arg2),
                (JSONMapper arg1, JSONValue arg2) => Decimal.ToUInt16(((JSONNumber)arg2).Decimal)
                ));
            Add(new JSONMapping(
                typeof(uint),
                (JSONMapper arg1, object arg2) => new JSONNumber((uint)arg2),
                (JSONMapper arg1, JSONValue arg2) => Decimal.ToUInt32(((JSONNumber)arg2).Decimal)
                ));
            Add(new JSONMapping(
                typeof(ulong),
                (JSONMapper arg1, object arg2) => new JSONNumber((ulong)arg2),
                (JSONMapper arg1, JSONValue arg2) => Decimal.ToUInt64(((JSONNumber)arg2).Decimal)
                ));

            /**
             * Float
             **/
            Add(new JSONMapping(
                typeof(float),
                (JSONMapper arg1, object arg2) => new JSONNumber((float)arg2),
                (JSONMapper arg1, JSONValue arg2) => (float)Decimal.ToDouble(((JSONNumber)arg2).Decimal)
                ));
            Add(new JSONMapping(
                typeof(double),
                (JSONMapper arg1, object arg2) => new JSONNumber((double)arg2),
                (JSONMapper arg1, JSONValue arg2) => Decimal.ToDouble(((JSONNumber)arg2).Decimal)
                ));

            /**
             * Strings
             **/

            Add(new JSONMapping(
                typeof(string),
                (JSONMapper arg1, object arg2) => new JSONString((string)arg2),
                (JSONMapper arg1, JSONValue arg2) => ((JSONString)arg2).Value
                ));

            /**
             * Others
             **/

            Add(new JSONMapping(
               typeof(bool),
               (JSONMapper arg1, object arg2) => ((bool)arg2) ? (JSONValue)JSONTrue.Instance : (JSONValue)JSONFalse.Instance,
               (JSONMapper arg1, JSONValue arg2) => (arg2.ValueType == JSONValueType.TRUE) || (arg2.ValueType == JSONValueType.FALSE) ? false : throw new NotSupportedException()
               ));

            Add(new JSONDateTimeMapping());
            Add(new JSONDateTimeOffsetMapping());
            Add(new JSONGuidMapping());
            Add(new JSONIPv4Mapping());
            Add(new JSONNetwork4Mapping());
            Add(new JSONTimeSpanMapping());

            Add(new JSONRPCCallMapping());
			Add(new JSONRPCResultMapping());

        }

        public void Add(JSONMapping mapping)
        {
            mappings[mapping.TargetType] = mapping;
        }

        private JSONMapping FindMapping(Type targetType)
        {
            if (mappings.ContainsKey(targetType))
                return mappings[targetType];
            if (this != DefaultMapper)
                return DefaultMapper.FindMapping(targetType);

            if (!targetType.IsPrimitive)
            {
                if (targetType.IsArray)
                {
                    Add(new JSONArrayMapping(targetType));
                }
                else if (targetType.IsEnum)
                {
                    Add(new JSONEnumMapping(targetType));
                }
                else if (targetType.IsGenericType)
                {
                    Type genericTypeDefinition = targetType.GetGenericTypeDefinition();
                    if (genericTypeDefinition.Equals(typeof(IEnumerable<>)))
                    {
                        Add((JSONMapping)Activator.CreateInstance(typeof(JSONEnumerableMapping<>).MakeGenericType(targetType.GetGenericArguments()[0])));
                    } else if (genericTypeDefinition.Equals(typeof(Dictionary<,>)))
                    {
                        Add((JSONMapping)Activator.CreateInstance(typeof(JSONDictionaryMapping<,>).MakeGenericType(targetType.GetGenericArguments())));
                    }
                }
                else
                {
                    Add(new JSONObjectMapping(targetType));
                }
                return mappings[targetType];
            }

            throw new NotSupportedException(targetType.ToString());
        }

        public T FromJson<T>(string jsonString) => FromJson<T>((JSONObject)JSONParser.Parse(jsonString));
        public T FromJson<T>(JSONValue json) => (T)FromJson(json, typeof(T));
        public object FromJson(string jsonString, Type targetType) => FromJson((JSONObject)JSONParser.Parse(jsonString), targetType);
        public object FromJson(JSONValue json, Type targetType)
        {
            if (json.ValueType == JSONValueType.NULL)
                return null;

            return FindMapping(targetType).FromJson(this, json);
        }
        public JSONValue ToJson(object value)
        {
            if (value == null)
                return JSONNull.Instance;

            Type sourceType = value.GetType();
            return FindMapping(sourceType).ToJson(this, value);
        }

        public void Apply(string jsonString, object o) => Apply((JSONObject)JSONParser.Parse(jsonString), o);
        public void Apply(JSONObject json,object o)
        {
            JSONMapping mapping = FindMapping(o.GetType());
            if (!(mapping is JSONObjectMapping))
                throw new NotSupportedException();

            JSONObjectMapping objectMapping = mapping as JSONObjectMapping;
            objectMapping.Apply(this, json, o);
        }


    }
}