using Newtonsoft.Json.Serialization;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace OASystem.API.OAMethodLib
{

    #region 日期格式转换

    public class DateTimeJsonConverter : System.Text.Json.Serialization.JsonConverter<DateTime>
    {
        private readonly string Format;
        public DateTimeJsonConverter(string format)
        {
            Format = format;
        }
        public override void Write(Utf8JsonWriter writer, DateTime date, JsonSerializerOptions options)
        {
            writer.WriteStringValue(date.ToString(Format));
        }
        public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            return DateTime.ParseExact(reader.GetString(), Format, null);
        }
    }
    #endregion

    #region null值转空字符串 NewtonsoftJson

    public class NullToEmptyStringResolver : CamelCasePropertyNamesContractResolver
    {
        /// <summary>
        /// 创建属性
        /// </summary>
        /// <param name="type">类型</param>
        /// <param name="memberSerialization">序列化成员</param>
        /// <returns></returns>
        protected override IList<Newtonsoft.Json.Serialization.JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
        {
            return type.GetProperties().Select(c =>
            {
                var jsonProperty = base.CreateProperty(c, memberSerialization);
                jsonProperty.ValueProvider = new NullToEmptyStringValueProvider(c);
                return jsonProperty;
            }).ToList();
        }
    }

    public class NullToEmptyStringValueProvider : IValueProvider
    {
        private readonly PropertyInfo _memberInfo;
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="memberInfo"></param>
        public NullToEmptyStringValueProvider(PropertyInfo memberInfo)
        {
            _memberInfo = memberInfo;
        }

        /// <summary>
        /// 获取Value
        /// </summary>
        /// <param name="target"></param>
        /// <returns></returns>
        public object GetValue(object target)
        {
            var result = _memberInfo.GetValue(target);
            if (_memberInfo.PropertyType == typeof(string) && result == null)
                result = string.Empty;
            return result;
        }

        /// <summary>
        /// 设置Value
        /// </summary>
        /// <param name="target"></param>
        /// <param name="value"></param>
        public void SetValue(object target, object value)
        {
            _memberInfo.SetValue(target, value);
        }
    }

    #endregion

}