using System.Runtime.Intrinsics.X86;
using System.Text;
using System.Text.Json;
using System.Text.RegularExpressions;

namespace LearningOfficer.OA.Mobile.Api.Filters
{
    public class CustomJsonNamingPolicy : JsonNamingPolicy
    {
        public override string ConvertName(string name)
        {
            //第一个字母小写
            if (string.IsNullOrEmpty(name))
            {
                return name;
            }
            if (name.Length > 1 && char.IsUpper(name[0]))
            {
                name = char.ToLower(name[0]) + name.Substring(1);
            }

            return ChangeName(name);
        }
        private string ChangeName(string name)
        {
            Match mt = Regex.Match(name, @"_(\w*)*");
            if (mt.Success)
            {
                var sb = new StringBuilder();
                bool toUpper = false;
                for (int i = 0; i < name.Length; i++)
                {
                    char c = name[i];
                    if (c == '_')
                    {
                        toUpper = true;
                    }
                    else
                    {
                        sb.Append(toUpper ? char.ToUpperInvariant(c) : c);
                        toUpper = false;
                    }
                }
                if (sb.Length > 0)
                {

                    sb[0] = char.ToLowerInvariant(sb[0]);
                }
                return sb.ToString();
            }
            return name;
        }
    }
}