using System.Collections;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;

namespace TradeManageNew.APIClients.FedexAPI.Utils
{
    internal class EnumCollectionConverter  : JsonConverter
    {
        private readonly StringEnumConverter _stringEnumConverter = new StringEnumConverter();

        public override bool CanConvert(System.Type objectType)
        {
            return objectType.IsGenericType &&
                   typeof(IEnumerable).IsAssignableFrom(objectType) &&
                   objectType.GetGenericArguments()[0].IsEnum;
        }

        public override object ReadJson(JsonReader reader, System.Type objectType, object existingValue, JsonSerializer serializer)
        {
            throw new System.NotImplementedException("Deserialization is not implemented.");
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            if (value is IEnumerable enumCollection)
            {
                // 遍历集合并获取每个枚举的字符串值
                var enumNames = enumCollection.Cast<object>()
                    .Select(GetEnumMemberValue)
                    .ToList();

                serializer.Serialize(writer, enumNames);
            }
            else
            {
                throw new System.InvalidOperationException("Expected an enumerable type.");
            }
        }

        private static string GetEnumMemberValue(object enumValue)
        {
            var enumType = enumValue.GetType();
            var memberInfo = enumType.GetMember(enumValue.ToString()).FirstOrDefault();
            if (memberInfo != null)
            {
                var enumMemberAttr = memberInfo.GetCustomAttribute<EnumMemberAttribute>();
                if (enumMemberAttr != null)
                {
                    return enumMemberAttr.Value;
                }
            }
            return enumValue.ToString();
        }
    }
}