using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace APT.Infrastructure.Core
{
	public class JsonContractResolver : DefaultContractResolver
	{
		protected override IValueProvider CreateMemberValueProvider(MemberInfo member)
		{
			return new JsonExpressionValueProvider(member);
		}
		protected override JsonProperty CreatePropertyFromConstructorParameter(JsonProperty matchingMemberProperty, ParameterInfo parameterInfo)
		{
			var temp = base.CreatePropertyFromConstructorParameter(matchingMemberProperty, parameterInfo);
			if (temp.PropertyType.GetUnNullableType() == typeof(Guid) ||
				temp.PropertyType.GetUnNullableType() == typeof(DateTime))
				temp.NullValueHandling = NullValueHandling.Include;
			return temp;
		}
		protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
		{
			var temp = base.CreateProperty(member, memberSerialization);
			if (temp.PropertyType.GetUnNullableType() == typeof(Guid) ||
				temp.PropertyType.GetUnNullableType() == typeof(DateTime))
				temp.NullValueHandling = NullValueHandling.Include;
			return temp;
		}
	}

	public class JsonExpressionValueProvider : ExpressionValueProvider, IValueProvider
	{
		private readonly MemberInfo _memberInfo;
		 
		public JsonExpressionValueProvider(MemberInfo memberInfo):base(memberInfo)
		{ 
			_memberInfo = memberInfo;
		}


		protected virtual object GetValueByType(Type type)
		{
			object obj = null;
			if (type == typeof(decimal))
				obj = decimal.Zero;
			else if (type == typeof(int))
				obj = 0;
			else if (type == typeof(byte))
				obj = byte.MinValue;
			else if (type == typeof(bool))
				obj = false;
			else if (type == typeof(double))
				obj = (double)0;
			return obj;
		}

		public new object GetValue(object target)
		{
			object obj = base.GetValue(target);
			if (obj == null)
			{
				Type realType = null;
				PropertyInfo propertyInfo = _memberInfo as PropertyInfo;
				if (propertyInfo != null)
					realType = propertyInfo.PropertyType.GetUnNullableType();
				FieldInfo fieldInfo = _memberInfo as FieldInfo;
				if (fieldInfo != null)
					realType = fieldInfo.FieldType.GetUnNullableType(); 
				if (realType != null)
					obj = this.GetValueByType(realType); 
			}
			return obj;
		}
	}
	 

}