using Furion.DataValidation;
using Furion.FriendlyException;
using Mapster.Utils;
using System;
using System.Collections.Generic;
using System.Data.SqlTypes;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FlexJobApi.Core
{
    /// <summary>
    /// 字符串工具
    /// </summary>
    public static class StringUtils
    {
        /// <summary>
        /// 校验字符串为空
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsNull([NotNullWhen(false)] this string str)
        {
            return string.IsNullOrWhiteSpace(str) || str == "undefined";
        }

        /// <summary>
        /// 校验字段不为空
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsNotNull([NotNullWhen(true)] this string str)
        {
            return !str.IsNull();
        }

        public static Guid? ToGuid(this string str, string requiredMessage = null)
        {
            if (str.IsNotNull() && Guid.TryParse(str, out var guid) && guid != Guid.Empty) return guid;
            if (requiredMessage.IsNotNull()) throw Oops.Oh(EnumErrorCodeType.s400, requiredMessage);
            return null;
        }

        public static int? ToInt(this string str)
        {
            if (str.IsNotNull() && int.TryParse(str, out var @int)) return @int;
            return null;
        }

        public static decimal? ToDecimal(this string str)
        {
            if (str.IsNotNull() && decimal.TryParse(str, out var @int)) return @int;
            return null;
        }

        public static T? ToEnum<T>(this string str, string requiredMessage = null)
             where T : struct
        {
            if (str.IsNotNull() && Enum.TryParse<T>(str, out var @enum)) return @enum;
            if (requiredMessage.IsNotNull()) throw Oops.Oh(EnumErrorCodeType.s400, requiredMessage);
            return null;
        }

        /// <summary>
        /// 获取复数英文名
        /// </summary>
        /// <param name="singularName"></param>
        /// <returns></returns>
        public static string GetPluralizedName(this string singularName)
        {
            if (singularName.EndsWith("s") || singularName.EndsWith("x") || singularName.EndsWith("z") ||
                singularName.EndsWith("ch") || singularName.EndsWith("sh"))
            {
                return singularName + "es";
            }
            else if (singularName.EndsWith("y") && !"aeiou".Contains(singularName[singularName.Length - 2]))
            {
                return singularName.Substring(0, singularName.Length - 1) + "ies";
            }
            else
            {
                return singularName + "s";
            }
        }

        public static bool CheckIsIdentityNumber18(this string identity)
        {
            return identity.IsNotNull() && identity.TryValidate(EnumValidationTypes.ValiIdentity).IsValid && identity.Length == 18;
        }

        /// <summary>
        /// 获取性别
        /// </summary>
        /// <param name="identity"></param>
        /// <returns></returns>
        public static EnumUserGender? GetGender(this string identity)
        {
            if (identity.CheckIsIdentityNumber18())
            {
                return identity[16] % 2 == 0
                    ? EnumUserGender.Female
                    : EnumUserGender.Male;
            }
            else
            {
                return null;
            }
        }

        /// <summary>
        /// 获取生日
        /// </summary>
        /// <param name="identity"></param>
        /// <returns></returns>
        public static DateTime? GetBirthday(this string identity)
        {
            if (identity.CheckIsIdentityNumber18())
            {
                return new DateTime(
                    identity.Substring(6, 4).ToInt()!.Value,
                    identity.Substring(10, 2).ToInt()!.Value,
                    identity.Substring(12, 2).ToInt()!.Value);
            }
            else
            {
                return null;
            }
        }

        /// <summary>
        /// 获取年龄
        /// </summary>
        /// <param name="identity"></param>
        /// <returns></returns>
        public static int? GetAge(this string identity)
        {
            if (identity.CheckIsIdentityNumber18())
            {
                var birthday = identity.GetBirthday();
                return birthday.GetAge();
            }
            else
            {
                return null;
            }
        }

        /// <summary>
        /// 生成随机字符串
        /// </summary>
        /// <param name="length"></param>
        /// <returns></returns>
        public static string GenerateRandomString(int length)
        {
            if (length <= 0) return null;
            var random = new Random();
            var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
            var result = new StringBuilder(length);
            for (int i = 0; i < length; i++)
            {
                // 从字符集中随机选择一个字符
                int index = random.Next(chars.Length);
                result.Append(chars[index]);
            }
            return result.ToString();
        }
    }
}