using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using UnityEngine;

namespace MyFrameworkPure
{
    /// <summary>
    /// 加密工具类
    /// </summary>
    public static class EncryptTool
    {
        /// <summary>
        /// 计算字符串的MD5值
        /// </summary>
        public static string md5(string source)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            byte[] data = System.Text.Encoding.UTF8.GetBytes(source);
            byte[] md5Data = md5.ComputeHash(data, 0, data.Length);
            md5.Clear();

            string destString = "";
            for (int i = 0; i < md5Data.Length; i++)
            {
                destString += System.Convert.ToString(md5Data[i], 16).PadLeft(2, '0');
            }
            destString = destString.PadLeft(32, '0');
            return destString;
        }

        /// <summary>
        /// 计算文件的MD5值
        /// </summary>
        public static string md5file(string file)
        {
            try
            {
                FileStream fs = new FileStream(file, FileMode.Open);
                System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
                byte[] retVal = md5.ComputeHash(fs);
                fs.Close();

                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < retVal.Length; i++)
                {
                    sb.Append(retVal[i].ToString("x2"));
                }
                return sb.ToString();
            }
            catch (Exception ex)
            {
                throw new Exception("md5file() fail, error:" + ex.Message);
            }
        }

        /// <summary>
        /// 对称加密与解密
        /// </summary>
        /// <param equimpentName="encryptStr"></param>
        /// <param equimpentName="key"></param>
        /// <returns></returns>
        public static string Encrypt(string encryptStr, string key = "aescodtuy@#p^sfd")
        {
            byte[] keyArray = Encoding.UTF8.GetBytes(key);
            byte[] toEncryptArray = Encoding.UTF8.GetBytes(encryptStr);
            RijndaelManaged rDel = new RijndaelManaged
            {
                Key = keyArray,
                Mode = CipherMode.ECB,
                Padding = PaddingMode.PKCS7
            };
            ICryptoTransform cTransform = rDel.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        public static string Decrypt(string decryptStr, string key = "aescodtuy@#p^sfd")
        {
            try
            {
                byte[] keyArray = Encoding.UTF8.GetBytes(key);
                byte[] toEncryptArray = Convert.FromBase64String(decryptStr);
                RijndaelManaged rDel = new RijndaelManaged
                {
                    Key = keyArray,
                    Mode = CipherMode.ECB,
                    Padding = PaddingMode.PKCS7
                };
                ICryptoTransform cTransform = rDel.CreateDecryptor();
                byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
                return Encoding.UTF8.GetString(resultArray);
            }
            catch (Exception e)
            {
                Debug.Log(e.ToString());
            }
            return string.Empty;
        }

        /// <summary>
        /// base16编码
        /// </summary>
        /// <param name="str"></param>
        /// <param name="autoCode"></param>
        /// <returns></returns>
        public static string Base16Encrypt(string str, string[] autoCode = null)
        {
            string innerStr = string.Empty;
            StringBuilder strEn = new StringBuilder();
            if (autoCode == null || autoCode.Length < 16)
                autoCode = new string[] { "a", "2", "B", "g", "E", "5", "f", "6", "C", "8", "o", "9", "Z", "p", "k", "M" };
            System.Collections.ArrayList arr = new System.Collections.ArrayList(System.Text.Encoding.Default.GetBytes(str));
            for (int i = 0; i < arr.Count; i++)
            {
                byte data = (byte)arr[i];
                int v1 = data >> 4;
                strEn.Append(autoCode[v1]);
                int v2 = ((data & 0x0f) << 4) >> 4;
                strEn.Append(autoCode[v2]);
            }
            return strEn.ToString();
        }

        /// <summary>
        /// base64编码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Base64Encode(string str)
        {
            var bytes = Encoding.UTF8.GetBytes(str);
            return Convert.ToBase64String(bytes);
        }

        /// <summary>
        /// base64解码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Base64Decode(string str)
        {
            var bytes = Convert.FromBase64String(str);
            return Encoding.UTF8.GetString(bytes);
        }

        /// <summary>
        /// sha1加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string Sha1(string str)
        {
            using (SHA1Managed sha1 = new SHA1Managed())
            {
                var hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(str));
                var sb = new StringBuilder(hash.Length * 2);

                foreach (byte b in hash)
                {
                    // can be "x2" if you want lowercase
                    sb.Append(b.ToString("X2"));
                }
                return sb.ToString();
            }
        }
    }

}