using Newtonsoft.Json;
using POSV.Helper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace POSV.Proxy.Translation
{
    public class TranslationProxy
    {
        private Tuple<bool, string, TranslateData> TranslationAPI(string values, string type)
        {
            try
            {
                string url = "http://fanyi.youdao.com/translate";
                Dictionary<string, string> parameters = new Dictionary<string, string>();
                parameters.Add("doctype", "json");
                parameters.Add("type", type);
                parameters.Add("i", values);
                var _data = JsonConvert.DeserializeObject<TranslateData>(HttpGet(string.Format("http://fanyi.youdao.com/translate?doctype=json&type=ZH_CN2EN&i={0}", values).Trim()));
                // var _data = JsonConvert.DeserializeObject<TranslateData>(HttpHelper.Get(url, parameters).Trim());
                return new Tuple<bool, string, TranslateData>(true, "", _data);
            }
            catch (Exception ex)
            {
                return new Tuple<bool, string, TranslateData>(false, "", null);
            }
        }
        /// <summary>
        /// 发起一个HTTP请求（以GET方式）
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public string HttpGet(string url)
        {
            System.Net.WebRequest myWebRequest = System.Net.WebRequest.Create(url);
            System.Net.WebResponse myWebResponse = myWebRequest.GetResponse();
            System.IO.Stream ReceiveStream = myWebResponse.GetResponseStream();
            string responseStr = "";
            if (ReceiveStream != null)
            {
                System.IO.StreamReader reader = new System.IO.StreamReader(ReceiveStream, Encoding.UTF8);
                responseStr = reader.ReadToEnd();
                reader.Close();
            }
            myWebResponse.Close();
            return responseStr;
        }

        public string ToTranslationString(string values, LanguageTyle languageTyle)
        {
            // 原文
            string q = values;
            // 源语言
            string from = "zh";
            // 目标语言
            string to = "en";
            // 改成您的APP ID
            string appId = "20190902000331348";
            Random rd = new Random();
            string salt = rd.Next(100000).ToString();
            // 改成您的密钥
            string secretKey = "pTgm3KRWD2CkIqWthIIH";
            string sign = EncryptString(appId + q + salt + secretKey);
            string url = "http://api.fanyi.baidu.com/api/trans/vip/translate?";
            url += "q=" + System.Web.HttpUtility.UrlEncode(q);
            url += "&from=" + from;
            url += "&to=" + to;
            url += "&appid=" + appId;
            url += "&salt=" + salt;
            url += "&sign=" + sign;
            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";
            request.UserAgent = null;
            request.Timeout = 6000;
            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.Stream myResponseStream = response.GetResponseStream();
            System.IO.StreamReader myStreamReader = new System.IO.StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            string retString = myStreamReader.ReadToEnd();

            var _data = JsonConvert.DeserializeObject<TranslateData>(retString);
            
            return _data.TransResults[0].Dst; 
            //try
            //{
            //    var _data = this.TranslationAPI(values, ToLanguageTyleString(languageTyle));

            //    if (!_data.Item1)
            //    {
            //        return values;
            //    }

            //    return _data.Item3.TranslateResult[0][0].Tgt;
            //}
            //catch (Exception)
            //{
            //    return values;
            //}
        }
        // 计算MD5值
        public static string EncryptString(string str)
        {
            MD5 md5 = MD5.Create();
            // 将字符串转换成字节数组
            byte[] byteOld = Encoding.UTF8.GetBytes(str);
            // 调用加密方法
            byte[] byteNew = md5.ComputeHash(byteOld);
            // 将加密结果转换为字符串
            StringBuilder sb = new StringBuilder();
            foreach (byte b in byteNew)
            {
                // 将字节转换成16进制表示的字符串，
                sb.Append(b.ToString("x2"));
            }
            // 返回加密的字符串
            return sb.ToString();
        }

        private string ToLanguageTyleString(LanguageTyle languageTyle)
        {
            switch (languageTyle)
            {
                case LanguageTyle.English:
                    return "ZH_CN2EN";
                case LanguageTyle.Japanese:
                    return "ZH_CN2JA";
                default:
                    return "";
            }
        }
    }

    public class TranslateData
    {
        private string from;
        private string to;
        private List<TransResult> transResults;
        private string type;
        private string errorCode;
        private string elapsedTime;
        private List<List<TranslateResult>> translateResult;

        [JsonProperty(PropertyName = "translateResult")]
        public List<List<TranslateResult>> TranslateResult { get => translateResult; set => translateResult = value; }
        [JsonProperty(PropertyName = "type")]
        public string Type { get => type; set => type = value; }
        [JsonProperty(PropertyName = "errorCode")]
        public string ErrorCode { get => errorCode; set => errorCode = value; }
        [JsonProperty(PropertyName = "elapsedTime")]
        public string ElapsedTime { get => elapsedTime; set => elapsedTime = value; }
        [JsonProperty(PropertyName = "trans_result")]
        public List<TransResult> TransResults { get => transResults; set => transResults = value; }
        [JsonProperty(PropertyName = "from")]
        public string From { get => from; set => from = value; }
        [JsonProperty(PropertyName = "to")]
        public string To { get => to; set => to = value; } 
    }

    public class TranslateResult
    {
        private string src;
        private string tgt;

        [JsonProperty(PropertyName = "src")]
        public string Src { get => src; set => src = value; }
        [JsonProperty(PropertyName = "tgt")]
        public string Tgt { get => tgt; set => tgt = value; }
    }


    public class TransResult
    {
        private string src;
        private string dst;
        [JsonProperty(PropertyName = "src")]
        public string Src { get => src; set => src = value; }
        [JsonProperty(PropertyName = "dst")]
        public string Dst { get => dst; set => dst = value; }
    }
    public enum LanguageTyle
    {

        /// <summary>
        /// 英语
        /// </summary>
        English,
        /// <summary>
        /// 日语
        /// </summary>
        Japanese
    }
}