using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;

namespace InterfaceForward.Application.Helpers;

public class StringHelper
{
    /// <summary>
    /// 只能输入英文字符和键盘上常用的符号
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    public static bool IsValidEnglishString(string input)
    {
        if (string.IsNullOrEmpty(input))
        {
            return false;
        }

        // Regular expression to match only English letters and specified symbols
        var regex = new Regex(@"^[a-zA-Z\(\)@!#$%^&*_\-+=;:""'/><,.\s]+$");
        return regex.IsMatch(input);
    }


    /// <summary>获取字符串的hash值</summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string GetHash(string str)
    {
        if (string.IsNullOrEmpty(str)) return string.Empty;

        // 将字符串转换为字节
        byte[] data = Encoding.UTF8.GetBytes(str);

        // 创建SHA256实例
        using SHA256 sha256 = SHA256.Create();
        // 计算哈希值
        byte[] hash = sha256.ComputeHash(data);

        // 将哈希值转换为16进制字符串
        StringBuilder sb = new StringBuilder();
        foreach (byte b in hash)
        {
            sb.Append(b.ToString("x2"));
        }

        return sb.ToString();
    }
}