using System.ComponentModel.DataAnnotations;
using System.Text.RegularExpressions;

namespace Masuit.Tools.Core.Validator;

/// <summary>
/// 强密码验证，默认最小长度6，最大长度30，必须包含数字、字母、特殊符号
/// </summary>
public class ComplexPasswordAttribute : ValidationAttribute
{
    /// <summary>
    /// 必须包含数字
    /// </summary>
    public bool MustNumber { get; set; } = true;

    /// <summary>
    /// 必须包含小写或大写字母
    /// </summary>
    public bool MustLetter { get; set; } = true;

    /// <summary>
    /// 必须包含特殊符号
    /// </summary>
    public bool MustSymbol { get; set; } = true;

    private readonly int _minLength = 6;
    private readonly int _maxLength = 30;

    public ComplexPasswordAttribute()
    {
    }

    public ComplexPasswordAttribute(int minLength, int maxLength)
    {
        _minLength = minLength;
        _maxLength = maxLength;
    }

    /// <summary>
    /// 校验密码强度
    /// </summary>
    /// <param name="value"></param>
    /// <returns></returns>
    public override bool IsValid(object value)
    {
        string pwd = value.ToString();
        if (pwd.Length < _minLength)
        {
            ErrorMessage = $"密码过短，至少需要{_minLength}个字符！";
            return false;
        }
        string regStr = "";
        if (MustNumber)
        {
            regStr += "(?=.*[0-9])"; //必须包含数字
        }

        if (MustLetter)
        {
            regStr += "(?=.*[a-zA-Z])";//必须包含小写或大写字母
        }

        if (MustSymbol)
        {
            regStr += @"(?=([\x21-\x7e]+)[^a-zA-Z0-9])";//必须包含特殊符号
        }

        var regex = new Regex($"{regStr}.{{{_minLength},{_maxLength}}}", RegexOptions.IgnorePatternWhitespace);
        if (regex.Match(pwd).Success)
        {
            return true;
        }

        string error = "密码强度值不够，密码";
        if (MustNumber && !Regex.IsMatch(pwd, "(?=.*[0-9])"))
        {
            error += "必须包含数字，";
        }

        if (MustLetter && !Regex.IsMatch(pwd, "(?=.*[a-zA-Z])"))
        {
            error += "必须包含小写或大写字母，";
        }

        if (MustSymbol && !Regex.IsMatch(pwd, @"(?=([\x21-\x7e]+)[^a-zA-Z0-9])"))
        {
            error += "必须包含至少一个特殊符号，";
        }

        ErrorMessage = error + $"至少{_minLength}个字符，最多{_maxLength}个字符！";
        return false;
    }
}