using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Security.Cryptography;
using System.IO;
using System.Text;
using Winsoft.GOV.XF.WebApi.WXCore.Models;
using Senparc.Weixin.MP.AdvancedAPIs.OAuth;
using Microsoft.AspNetCore.Http;

namespace Winsoft.GOV.XF.WebApi.WXCore.Helpers
{
    public static class Utilities
    {
        static ILoggerFactory _loggerFactory;


        public static void ConfigureLogger(ILoggerFactory loggerFactory)
        {
            _loggerFactory = loggerFactory;
        }

        public static ILogger CreateLogger<T>()
        {
            if (_loggerFactory == null)
            {
                throw new InvalidOperationException($"{nameof(ILogger)} is not configured. {nameof(ConfigureLogger)} must be called before use");
                //_loggerFactory = new LoggerFactory().AddConsole().AddDebug();
            }

            return _loggerFactory.CreateLogger<T>();
        }

        public static string ContentRootPath { get; set; }


        public static string AESEncrypt(this string input, string key)
        {

                byte[] bytesToBeEncrypted = Encoding.UTF8.GetBytes(input);
                byte[] passwordBytes = Encoding.UTF8.GetBytes(key);

                passwordBytes = SHA256.Create().ComputeHash(passwordBytes);

                byte[] bytesEncrypted = AESEncryptBytes(bytesToBeEncrypted, passwordBytes);

                string result = bytesEncrypted.ToHexStr();

                return result;
        }

        private static byte[] AESEncryptBytes(byte[] bytesToBeEncrypted, byte[] passwordBytes)
        {
            byte[] encryptedBytes = null;

            var saltBytes = new byte[9] { 13, 34, 27, 67, 189, 255, 104, 219, 122 };

            using (var ms = new MemoryStream())
            {
                using (var AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;

                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(32);
                    AES.IV = key.GetBytes(16);

                    AES.Mode = CipherMode.CBC;

                    using (var cs = new CryptoStream(ms, AES.CreateEncryptor(),
                        CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
                        cs.Close();
                    }

                    encryptedBytes = ms.ToArray();
                }
            }

            return encryptedBytes;
        }
        public static string AESDecrypt(this string input, string key)
        {
            byte[] bytesToBeDecrypted = input.ToHexBytes();

            byte[] passwordBytes = Encoding.UTF8.GetBytes(key);

            passwordBytes = SHA256.Create().ComputeHash(passwordBytes);

            byte[] bytesDecrypted = AESDecryptBytes(bytesToBeDecrypted, passwordBytes);

            string result = Encoding.UTF8.GetString(bytesDecrypted);

            return result;
        }

        public static byte[] AESDecryptBytes(byte[] bytesToBeDecrypted, byte[] passwordBytes)
        {
            byte[] decryptedBytes = null;

            var saltBytes = new byte[9] { 13, 34, 27, 67, 189, 255, 104, 219, 122 };

            using (var ms = new MemoryStream())
            {
                using (var AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;

                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(32);
                    AES.IV = key.GetBytes(16);

                    AES.Mode = CipherMode.CBC;

                    using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
                        cs.Close();
                    }

                    decryptedBytes = ms.ToArray();
                }
            }

            return decryptedBytes;
        }


        /// <summary> 
        /// 字符串转16进制字节数组 
        /// </summary> 
        /// <param name="hexString"></param> 
        /// <returns></returns> 
        public static byte[] ToHexBytes(this string hexString)
        {
            hexString = hexString.Replace(" ", "");
            if ((hexString.Length % 2) != 0)
                hexString += " ";
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            return returnBytes;
        }

        public static string GetBaseURL(this HttpRequest httpRequest)
        {
            string s = httpRequest.GetAbsoluteUri();
            if (s.Last() == '/')
                return s;
            else
                return s + "/";
        }

        /// <summary> 
        /// 字节数组转16进制字符串 
        /// </summary> 
        /// <param name="bytes"></param> 
        /// <returns></returns> 
        public static string ToHexStr(this byte[] bytes)
        {
            string returnStr = "";
            if (bytes != null)
            {
                for (int i = 0; i < bytes.Length; i++)
                {
                    returnStr += bytes[i].ToString("X2");
                }
            }
            return returnStr;
        }

        /// <summary> 
        /// 从汉字转换到16进制 
        /// </summary> 
        /// <param name="s"></param> 
        /// <param name="charset">编码,如"utf-8","gb2312"</param> 
        /// <param name="fenge">是否每字符用逗号分隔</param> 
        /// <returns></returns> 
        public static string ToHex(this string s, string charset, bool fenge)
        {
            if ((s.Length % 2) != 0)
            {
                s += " ";//空格 
                         //throw new ArgumentException("s is not valid chinese string!"); 
            }
            System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);
            byte[] bytes = chs.GetBytes(s);
            string str = "";
            for (int i = 0; i < bytes.Length; i++)
            {
                str += string.Format("{0:X}", bytes[i]);
                if (fenge && (i != bytes.Length - 1))
                {
                    str += string.Format("{0}", ",");
                }
            }
            return str.ToLower();
        }

        ///<summary> 
        /// 从16进制转换成汉字 
        /// </summary> 
        /// <param name="hex"></param> 
        /// <param name="charset">编码,如"utf-8","gb2312"</param> 
        /// <returns></returns> 
        public static string UnHex(this string hex, string charset)
        {
            if (hex == null)
                throw new ArgumentNullException("hex");
            hex = hex.Replace(",", "");
            hex = hex.Replace("\n", "");
            hex = hex.Replace("\\", "");
            hex = hex.Replace(" ", "");
            if (hex.Length % 2 != 0)
            {
                hex += "20";//空格 
            }
            // 需要将 hex 转换成 byte 数组。 
            byte[] bytes = new byte[hex.Length / 2];
            for (int i = 0; i < bytes.Length; i++)
            {
                try
                {
                    // 每两个字符是一个 byte。 
                    bytes[i] = byte.Parse(hex.Substring(i * 2, 2),
                    System.Globalization.NumberStyles.HexNumber);
                }
                catch
                {
                    // Rethrow an exception with custom message. 
                    throw new ArgumentException("hex is not a valid hex number!", "hex");
                }
            }
            System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);
            return chs.GetString(bytes);
        }
        /// <summary>
        /// 日期转换为时间戳（时间戳单位秒）
        /// </summary>
        /// <param name="TimeStamp"></param>
        /// <returns></returns>
        public static long ToTimeStamp(this DateTime time)
        {
            DateTime Jan1st1970 = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            return (long) (time.AddHours(-8) - Jan1st1970).TotalSeconds;
        }

        /// <summary>
        /// 时间戳转换为日期（时间戳单位秒）
        /// </summary>
        /// <param name="TimeStamp"></param>
        /// <returns></returns>
        public static DateTime ToDateTime(this long timeStamp)
        {
            var start = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            return start.AddSeconds(timeStamp).AddHours(8);
        }

        public static WXUser CopyFromOAuthUserInfo(this WXUser user, OAuthUserInfo userInfo)
        {
            user.Nickname = userInfo.nickname;
            user.HeadimgUrl = userInfo.headimgurl;
            user.Province = userInfo.province;
            user.UnionId = userInfo.unionid;
            user.Sex = userInfo.sex;
            user.OpenId = userInfo.openid;
            return user;
        }
    }

}