using System;
using System.Linq;
using System.Text.RegularExpressions;

namespace Magic.Core;

/// <summary>
/// 字符串验证帮助类
/// </summary>
public static class ValidatorUtil
{
    #region 验证输入字符串为数字(带小数)

    /// <summary>
    /// 验证输入字符串为带小数点正数
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsNumber(this string str)
    {
        return Regex.IsMatch(str, "^([0]|([1-9]+\\d{0,}?))(.[\\d]+)?$");
    }

    /// <summary>
    /// 验证输入字符串为带小数点正负数
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsNumberic(this string str)
    {
        return Regex.IsMatch(str, "^-?\\d+$|^(-?\\d+)(\\.\\d+)?$");
    }

    #endregion

    #region 验证中国电话格式是否有效，格式010-85849685

    /// <summary>
    /// 验证中国电话格式是否有效，格式010-85849685
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsTel(this string str)
    {
        return Regex.IsMatch(str, @"^(0[0-9]{2,3}\-)?([2-9][0-9]{6,7})+(\-[0-9]{1,4})?$", RegexOptions.IgnoreCase);
    }

    #endregion

    #region 验证输入字符串为电话号码

    /// <summary>
    /// 验证输入字符串为电话号码
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsPhone(this string str)
    {
        return Regex.IsMatch(str, @"(^(\d{2,4}[-_－—]?)?\d{3,8}([-_－—]?\d{3,8})?([-_－—]?\d{1,7})?$)|(^0?1[35]\d{9}$)");
        //弱一点的验证：  @"\d{3,4}-\d{7,8}"         
    }

    #endregion

    #region 验证是否是有效传真号码

    /// <summary>
    /// 验证是否是有效传真号码
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsFax(this string str)
    {
        return Regex.IsMatch(str, @"^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$");
    }

    #endregion

    #region 验证手机号是否合法

    /// <summary>
    /// 验证手机号是否合法 号段为13,14,15,16,17,18,19  0，86开头将自动识别
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsMobile(this string str)
    {
        if (!str.StartsWith("1"))
        {
            str = str.TrimStart('8', '6').TrimStart('0');
        }

        return Regex.IsMatch(str, @"^(13|14|15|16|17|18|19)\d{9}$");
    }

    #endregion

    #region 验证身份证是否有效

    /// <summary>
    /// 验证身份证是否有效
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsIdCard(this string str)
    {
        return str.Length switch
        {
            18 => str.IsIdCard18(),
            15 => str.IsIdCard15(),
            _ => false
        };
    }

    /// <summary>
    /// 验证输入字符串为18位的身份证号码
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsIdCard18(this string str)
    {
        if (long.TryParse(str.Remove(17), out var n) == false || n < Math.Pow(10, 16) ||
            long.TryParse(str.Replace('x', '0').Replace('X', '0'), out n) == false)
        {
            return false; //数字验证
        }

        const string address =
            "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
        if (address.IndexOf(str.Remove(2), StringComparison.Ordinal) == -1)
        {
            return false; //省份验证
        }

        var birth = str.Substring(6, 8).Insert(6, "-").Insert(4, "-");
        if (DateTime.TryParse(birth, out _) == false)
        {
            return false; //生日验证
        }

        var arrVarIfyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');
        var wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');
        var ai = str.Remove(17).ToCharArray();
        var sum = 0;
        for (var i = 0; i < 17; i++)
        {
            sum += int.Parse(wi[i]) * int.Parse(ai[i].ToString());
        }

        // ReSharper disable once UselessBinaryOperation
        Math.DivRem(sum, 11, out var y);
        return arrVarIfyCode[y] == str.Substring(17, 1).ToLower();
    }

    /// <summary>
    /// 验证输入字符串为15位的身份证号码
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsIdCard15(this string str)
    {
        if (long.TryParse(str, out var n) == false || n < Math.Pow(10, 14))
        {
            return false; //数字验证
        }

        const string address =
            "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
        if (address.IndexOf(str.Remove(2), StringComparison.Ordinal) == -1)
        {
            return false; //省份验证
        }

        var birth = str.Substring(6, 6).Insert(4, "-").Insert(2, "-");
        return DateTime.TryParse(birth, out _);
    }

    #endregion

    #region 验证是否是有效邮箱地址

    /// <summary>
    /// 验证是否是有效邮箱地址
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsEmail(this string str)
    {
        return Regex.IsMatch(str,
            @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
    }

    /// <summary>
    /// 验证是否是有效QQ邮箱地址
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsQqEmail(this string str)
    {
        return Regex.IsMatch(str, @"[1-9]\d{4,10}@qq\.com");
    }

    #endregion

    #region 验证是否只含有汉字

    /// <summary>
    /// 验证是否只含有汉字
    /// </summary>
    /// <param name="strLn">输入字符</param>
    /// <returns></returns>
    public static bool IsOnlyChinese(this string strLn)
    {
        return Regex.IsMatch(strLn, @"^[\u4e00-\u9fa5]+$");
    }

    #endregion

    #region 是否有多余的字符 防止SQL注入

    /// <summary>
    /// 是否有多余的字符 防止SQL注入
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns></returns>
    public static bool IsBadString(this string str)
    {
        if (string.IsNullOrEmpty(str))
            return false;
        //列举一些特殊字符串
        const string badChars =
            "@,*,#,$,!,+,',=,--,%,^,&,?,(,), <,>,[,],{,},/,\\,;,:,\",\"\",delete,update,drop,alert,select";
        var arraryBadChar = badChars.Split(',');
        return arraryBadChar.Any(t => !str.Contains(t));
    }

    #endregion

    #region 是否由数字、26个英文字母或者下划线組成的字串

    /// <summary>
    /// 是否由数字、26个英文字母或者下划线組成的字串 
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns></returns>
    public static bool IsNzx(this string str)
    {
        return Regex.Match(str, "^[0-9a-zA-Z_]+$").Success;
    }

    #endregion

    #region 由数字、26个英文字母、汉字組成的字串

    /// <summary>
    /// 由数字、26个英文字母、汉字組成的字串
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns></returns>
    public static bool IsSzzmChinese(this string str)
    {
        return Regex.Match(str, @"^[0-9a-zA-Z\u4e00-\u9fa5]+$").Success;
    }

    #endregion

    #region 由数字、26个英文字母組成的字串

    /// <summary>
    /// 是否由数字、26个英文字母組成的字串
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns></returns>
    public static bool IsSzzm(this string str)
    {
        return Regex.Match(str, @"^[0-9a-zA-Z]+$").Success;
    }

    #endregion

    #region 验证输入字符串为邮政编码

    /// <summary>
    /// 验证输入字符串为邮政编码
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    public static bool IsPostCode(this string str)
    {
        return Regex.IsMatch(str, @"\d{6}");
    }

    #endregion

    #region 检查对象的输入长度

    /// <summary>
    /// 检查对象的输入长度
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <param name="length">指定的长度</param>
    /// <returns>false 太长，true -太短</returns>
    public static bool CheckLength(this string str, int length)
    {
        if (str.Length > length)
        {
            return false; //长度太长
        }

        return str.Length >= length;
    }

    #endregion

    #region 判断用户输入是否为日期

    /// <summary>
    /// 判断用户输入是否为日期
    /// </summary>
    /// <param name="str">输入字符</param>
    /// <returns>返回一个bool类型的值</returns>
    /// <remarks>
    /// 可判断格式如下（其中-可替换为/，不影响验证)
    /// YYYY | YYYY-MM | YYYY-MM-DD | YYYY-MM-DD HH:MM:SS | YYYY-MM-DD HH:MM:SS.FFF
    /// </remarks>
    public static bool IsDateTime(this string str)
    {
        if (null == str)
        {
            return false;
        }

        const string regexDate =
            @"[1-2]{1}[0-9]{3}((-|\/|\.){1}(([0]?[1-9]{1})|(1[0-2]{1}))((-|\/|\.){1}((([0]?[1-9]{1})|([1-2]{1}[0-9]{1})|(3[0-1]{1})))( (([0-1]{1}[0-9]{1})|2[0-3]{1}):([0-5]{1}[0-9]{1}):([0-5]{1}[0-9]{1})(\.[0-9]{3})?)?)?)?$";
        if (!Regex.IsMatch(str, regexDate))
            return false;
        //以下各月份日期验证，保证验证的完整性
        int indexY;
        int indexM;
        int indexD;
        if (-1 != (indexY = str.IndexOf("-", StringComparison.Ordinal)))
        {
            indexM = str.IndexOf("-", indexY + 1, StringComparison.Ordinal);
            indexD = str.IndexOf(":", StringComparison.Ordinal);
        }
        else
        {
            indexY = str.IndexOf("/", StringComparison.Ordinal);
            indexM = str.IndexOf("/", indexY + 1, StringComparison.Ordinal);
            indexD = str.IndexOf(":", StringComparison.Ordinal);
        }

        //不包含日期部分，直接返回true
        if (-1 == indexM)
            return true;
        if (-1 == indexD)
        {
            indexD = str.Length + 3;
        }

        var iYear = Convert.ToInt32(str.Substring(0, indexY));
        var iMonth = Convert.ToInt32(str.Substring(indexY + 1, indexM - indexY - 1));
        var iDate = Convert.ToInt32(str.Substring(indexM + 1, indexD - indexM - 4));
        //判断月份日期
        if ((iMonth < 8 && 1 == iMonth % 2) || (iMonth > 8 && 0 == iMonth % 2))
        {
            if (iDate < 32)
                return true;
        }
        else
        {
            if (iMonth != 2)
            {
                if (iDate < 31)
                    return true;
            }
            else
            {
                //闰年
                if ((0 == iYear % 400) || (0 == iYear % 4 && 0 < iYear % 100))
                {
                    if (iDate < 30)
                        return true;
                }
                else
                {
                    if (iDate < 29)
                        return true;
                }
            }
        }

        return false;
    }

    #endregion
}