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

namespace DS.Module.Core.Helpers;

/// <summary>
///
/// </summary>
public class MD5Helper
{
    /// <summary>
    /// MD5加密字符串（32位大写）
    /// </summary>
    /// <param name="source">源字符串</param>
    /// <returns>加密后的字符串</returns>
    public static string MD5Encrypt(string source)
    {
        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
        byte[] bytes = Encoding.UTF8.GetBytes(source);
        string result = BitConverter.ToString(md5.ComputeHash(bytes));
        return result.Replace("-", "");
    }
    
    
    /// <summary>
    /// Md5加密 32位小写
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    public static string Md5EncryptLowerCase(string input)
    {
        MD5 md5 = MD5.Create();
        byte[] bytes = Encoding.Default.GetBytes(input);
        byte[] bytesMd5 = md5.ComputeHash(bytes);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < bytesMd5.Length; i++)
        {
            sb.Append(bytesMd5[i].ToString("x2")); //32位小写
        }

        return sb.ToString();
    }
    
    /// <summary>
    /// MD5 加密
    /// </summary>
    /// <param name="text">加密文本</param>
    /// <param name="uppercase">是否输出大写加密，默认 false</param>
    /// <param name="is16">是否输出 16 位</param>
    /// <returns></returns>
    public static string Encrypt(string text, bool uppercase = false, bool is16 = false)
    { 
        byte[] bytes = Encoding.UTF8.GetBytes(text);
        var data = MD5.HashData(bytes);

        var stringBuilder = new StringBuilder();
        for (var i = 0; i < data.Length; i++)
        {
            stringBuilder.Append(data[i].ToString("x2"));
        }

        var md5String = stringBuilder.ToString();
        var hash = !is16 ? md5String : md5String.Substring(8, 16);
        return !uppercase ? hash : hash.ToUpper();
    }
}