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;

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 = Convert.ToBase64String(bytesEncrypted);

                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 = Convert.FromBase64String(input);

            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>
        /// 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;
        }
    }

}