using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Security;
using System.Net;
using System.Security.Cryptography.X509Certificates;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace Infrastructure.Helpers
{
    public class HIKOpenAPI
    {

        /// <summary>
        /// 
        /// </summary>
        /// <param name="url"></param>
        /// <param name="api"></param>
        /// <param name="body"></param>
        /// <param name="ak"></param>
        /// <param name="sk"></param>
        /// <returns></returns>
        public static string HttpPost(string url, string api, string body, string ak, string sk)
        {

            var headers = new Dictionary<string, string> { { "Accept", "*/*" }, { "Content-Type", "application/json" } };

            var request = new Request(Method.POST_STRING, url, api, ak, sk, 10000)
            {
                Headers = headers,
                SignHeaderPrefixList = null,
                Querys = null,
                StringBody = body
            };

            var result = DoPoststring(request.Host, request.Path, request.Timeout, request.Headers, request.Querys, request.StringBody, request.SignHeaderPrefixList, request.AppKey, request.AppSecret, false);
            return result;
        }

        //Post请求方法
        public static string DoPoststring(string host, string path, int connectTimeout, Dictionary<string, string> headers,
            Dictionary<string, string> querys, string body, List<string> signHeaderPrefixList, string appKey,
            string appSecret, bool autoDown)
        {
            try
            {
                headers = initialBasicHeader("POST", path, headers, querys, null, signHeaderPrefixList, appKey,
                    appSecret);
                ServicePointManager.ServerCertificateValidationCallback =
                    RemoteCertificateValidate;
                //验证服务器证书回调自动验证
                //ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 |
                //                                       SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(initUrl(host, path, querys));
                request.KeepAlive = false;
                request.ProtocolVersion = HttpVersion.Version10;
                //设置HTTP协议的并发连接数
                //ServicePointManager.DefaultConnectionLimit = 512;
                //关闭重定向
                request.AllowAutoRedirect = true;
                request.Method = "POST";
                request.Timeout = connectTimeout;
                string accept = headers["Accept"];
                request.Accept = accept;
                string contentType = headers["Content-Type"];
                request.ContentType = contentType;

                foreach (string headerKey in headers.Keys)
                {
                    if (headerKey.Contains("x-ca-"))
                    {
                        request.Headers.Add(headerKey + ":" +
                                            (string.IsNullOrWhiteSpace(headers[headerKey]) ? "" : headers[headerKey]));
                    }
                    if (headerKey.Equals("tagId"))
                    {
                        request.Headers.Add(headerKey + ":" +
                                            (string.IsNullOrWhiteSpace(headers[headerKey]) ? "" : headers[headerKey]));
                    }
                }



                if (!string.IsNullOrWhiteSpace(body))
                {
                    byte[] postBytes = Encoding.UTF8.GetBytes(body);
                    request.ContentLength = postBytes.Length;
                    Stream requestStream = request.GetRequestStream();

                    requestStream.Write(postBytes, 0, postBytes.Length);
                    requestStream.Close();
                }


                var response = (HttpWebResponse)request.GetResponse();
                var result = "";
                if (response.StatusCode != HttpStatusCode.OK) return result;
                using (StreamReader rdr = new StreamReader(response.GetResponseStream()))
                {
                    result = rdr.ReadToEnd();
                }

                return result;
            }
            catch (Exception ex)
            {
                return Newtonsoft.Json.JsonConvert.SerializeObject(new { code = "404", msg = ex.Message });
            }
        }


        //获取当时时间戳
        public static long GetTimestamp(DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));
            long t = (time.Ticks - startTime.Ticks) / 10000; //除10000调整为13位      
            return t;

        }

        private static bool RemoteCertificateValidate(object sender, X509Certificate cert, X509Chain chain,
            SslPolicyErrors error)
        {
            //为了通过证书验证，总是返回true
            return true;
        }

        public static Dictionary<string, string> initialBasicHeader(string method, string path,
            Dictionary<string, string> headers, Dictionary<string, string> querys, Dictionary<string, string> bodys,
            List<string> signHeaderPrefixList, string appKey, string appSecret) //throws MalformedURLException
        {
            if (headers == null)
            {
                headers = new Dictionary<string, string>();
            }
            headers["x-ca-timestamp"] = GetTimestamp(DateTime.Now).ToString();
            headers["x-ca-nonce"] = System.Guid.NewGuid().ToString();
            headers["x-ca-key"] = appKey;
            headers["x-ca-signature"] = sign(appSecret, method, path, headers, querys, bodys, signHeaderPrefixList);

            return headers;
            //https://223.99.16.253:6114/pic?
            //5d00=a202l94-do7b18*35d69188-64fbf0ebc**561===sp**715=7t7662209067=1l3*1513o6*720-=46fe44pi1e9o=0-9e00b0
            //&AccessKeyId=Qrq2LsyWF6GSM0zm&Expires=1677046120&Signature=Bw7dKuV6CX7w3ev56u6jBwRuGwU=
        }

        public static string initUrl(string host, string path, Dictionary<string, string> querys)
        //throws UnsupportedEncodingException
        {
            StringBuilder sbUrl = new StringBuilder();
            sbUrl.Append(host);
            if (!string.IsNullOrWhiteSpace(path))
            {
                sbUrl.Append(path);
            }

            if (null != querys)
            {
                StringBuilder sbQuery = new StringBuilder();

                foreach (string queryKey in querys.Keys)
                {
                    if (0 < sbQuery.Length)
                    {
                        sbQuery.Append("&");
                    }

                    if (string.IsNullOrWhiteSpace(queryKey) && !string.IsNullOrWhiteSpace(querys[queryKey]))
                    {
                        sbQuery.Append(querys[queryKey]);
                    }

                    if (!string.IsNullOrWhiteSpace(queryKey))
                    {
                        sbQuery.Append(queryKey);
                        if (!string.IsNullOrWhiteSpace(querys[queryKey]))
                        {
                            sbQuery.Append("=").Append(HttpUtility.UrlEncode(querys[queryKey], Encoding.UTF8));
                        }
                    }
                }

                if (0 < sbQuery.Length)
                {
                    sbUrl.Append("?").Append(sbQuery);
                }
            }
            return sbUrl.ToString();
        }

        public static string sign(string secret, string method, string path, Dictionary<string, string> headers,
            Dictionary<string, string> querys, Dictionary<string, string> bodys, List<string> signHeaderPrefixList)
        {
            try
            {
                //return HmacSHA256(buildstringToSign(method, path, headers, querys, bodys, signHeaderPrefixList), secret);

                /*---message里的内容---*/
                //POST
                //*/*
                //application/json
                //x-ca-key:23125513
                //x-ca-nonce:12d28d90-a7c3-45cc-ae6a-0cc8d5e22118
                //x-ca-timestamp:1544495633599
                //artemis/api/resource/v1/org/advance/orgList
                string message = buildstringToSign(method, path, headers, querys, bodys, signHeaderPrefixList);



                return HmacSHA256(message, secret);
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }

        public static string buildstringToSign(string method, string path, Dictionary<string, string> headers,
            Dictionary<string, string> querys, Dictionary<string, string> bodys, List<string> signHeaderPrefixList)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append(method.ToUpper()).Append("\n");
            if (null != headers)
            {
                if (null != headers["Accept"])
                {
                    sb.Append((string)headers["Accept"]);
                    sb.Append("\n");
                }

                if (headers.Keys.Contains("Content-MD5") && null != headers["Content-MD5"])
                {
                    sb.Append((string)headers["Content-MD5"]);
                    sb.Append("\n");
                }

                if (null != headers["Content-Type"])
                {
                    sb.Append((string)headers["Content-Type"]);
                    sb.Append("\n");
                }

                if (headers.Keys.Contains("Date") && null != headers["Date"])
                {
                    sb.Append((string)headers["Date"]);
                    sb.Append("\n");
                }
            }

            sb.Append(buildHeaders(headers, signHeaderPrefixList));
            sb.Append(buildResource(path, querys, bodys));
            return sb.ToString();
        }

        public static string buildHeaders(Dictionary<string, string> headers, List<string> signHeaderPrefixList)
        {
            StringBuilder sb = new StringBuilder();
            if (null != signHeaderPrefixList)
            {
                signHeaderPrefixList.Remove("x-ca-signature");
                signHeaderPrefixList.Remove("Accept");
                signHeaderPrefixList.Remove("Content-MD5");
                signHeaderPrefixList.Remove("Content-Type");
                signHeaderPrefixList.Remove("Date");
                signHeaderPrefixList.Sort();
            }

            if (null != headers)
            {
                Dictionary<string, string> sortDictionary = new Dictionary<string, string>();
                sortDictionary = headers;
                //按key值升序排序
                var dicSort = from objDic in sortDictionary orderby objDic.Key ascending select objDic;

                StringBuilder signHeadersStringBuilder = new StringBuilder();

                foreach (KeyValuePair<string, string> kvp in dicSort)
                {
                    if (kvp.Key.Replace(" ", "").Contains("x-ca-"))
                    {
                        sb.Append(kvp.Key + ":");
                        if (!string.IsNullOrWhiteSpace(kvp.Value))
                        {
                            sb.Append(kvp.Value);
                        }
                        sb.Append("\n");
                        if (signHeadersStringBuilder.Length > 0)
                        {
                            signHeadersStringBuilder.Append(",");
                        }
                        signHeadersStringBuilder.Append(kvp.Key);
                    }
                }

                headers.Add("x-ca-signature-headers", signHeadersStringBuilder.ToString());
            }

            //x-ca-key:23125513
            //x-ca-nonce:12d28d90-a7c3-45cc-ae6a-0cc8d5e22118
            //x-ca-timestamp:1544495633599

            return sb.ToString();
        }

        public static string buildResource(string path, Dictionary<string, string> querys, Dictionary<string, string> bodys)
        {
            StringBuilder sb = new StringBuilder();
            if (!string.IsNullOrWhiteSpace(path))
            {
                sb.Append(path);
            }

            Dictionary<string, string> sortDictionary = new Dictionary<string, string>();
            if (querys != null)
            {
                //按key值升序排序
                var dicSort = from objDic in querys orderby objDic.Key ascending select objDic;
                foreach (KeyValuePair<string, string> kvp in dicSort)
                {
                    if (!string.IsNullOrWhiteSpace(kvp.Key))
                    {
                        sortDictionary[kvp.Key] = kvp.Value;
                    }
                }
            }

            if (bodys != null)
            {
                //按key值升序排序
                var dicSort = from objDic in bodys orderby objDic.Key ascending select objDic;
                foreach (KeyValuePair<string, string> kvp in dicSort)
                {
                    if (!string.IsNullOrWhiteSpace(kvp.Key))
                    {
                        sortDictionary[kvp.Key] = kvp.Value;
                    }
                }
            }

            StringBuilder sbParam = new StringBuilder();

            //按key值升序排序
            var dicSortDictionary = from objDic in sortDictionary orderby objDic.Key ascending select objDic;
            foreach (KeyValuePair<string, string> kvp in dicSortDictionary)
            {
                if (!string.IsNullOrWhiteSpace(kvp.Key))
                {
                    if (sbParam.Length > 0)
                    {
                        sbParam.Append("&");
                    }
                    sbParam.Append(kvp.Key);
                    if (!string.IsNullOrWhiteSpace(kvp.Value))
                    {
                        sbParam.Append("=").Append(kvp.Value);
                    }
                }
            }

            if (0 < sbParam.Length)
            {
                sb.Append("?");
                sb.Append(sbParam);
            }
            //artemis/api/resource/v1/org/advance/orgList
            return sb.ToString();
        }

        public static string HmacSHA256(string message, string secret)
        {
            secret = secret ?? "";
            var encoding = new System.Text.UTF8Encoding();
            byte[] keyByte = encoding.GetBytes(secret);
            byte[] messageBytes = encoding.GetBytes(message);
            using (var hmacsha256 = new HMACSHA256(keyByte))
            {
                byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
                return Convert.ToBase64String(hashmessage);
            }
        }

        public static Dictionary<string, object> ConvertMapTimeStyle(Dictionary<string, object> paramMap)
        {
            Dictionary<string, object> timeMap = new Dictionary<string, object>();
            try
            {
                foreach (string key in paramMap.Keys)
                {

                    object mapValueObj = paramMap[key];
                    Dictionary<string, object> dic = mapValueObj as Dictionary<string, object>;
                    if (dic != null)
                    {
                        ConvertMapTimeStyle(dic);
                    }
                    //时间格式参数转为ISO8601
                    DateTime mapDate;
                    if (DateTime.TryParse(paramMap[key].ToString(), out mapDate))
                    {
                        string ISO8601time = mapDate.ToString("yyyy-MM-ddTHH:mm:ss.fffzzz");
                        timeMap.Add(key, ISO8601time);
                    }
                }
                if (timeMap.Count > 0)
                {
                    foreach (string key in timeMap.Keys)
                    {
                        paramMap[key] = timeMap[key];
                    }
                }
                return paramMap;
            }
            catch (Exception ex)
            {
                return paramMap;
            }
        }



        public enum Method
        {
            GET,
            POST_FORM,
            POST_STRING,
            POST_BYTES,
            PUT_FORM,
            PUT_STRING,
            PUT_BYTES,
            DELETE
        }

        public class Request
        {
            public Request()
            {
            }

            public Request(Method method, string host, string path, string appKey, string appSecret, int timeout)
            {
                this.Method = method;
                this.Host = host;
                this.Path = path;
                this.AppKey = appKey;
                this.AppSecret = appSecret;
                this.Timeout = timeout;
            }

            public Method Method { get; set; }

            public string Host { get; set; }

            public string Path { get; set; }

            public string AppKey { get; set; }

            public string AppSecret { get; set; }

            public int Timeout { get; set; }

            public Dictionary<string, string> Headers { get; set; }

            public Dictionary<string, string> Querys { get; set; }

            public Dictionary<string, string> Bodys { get; set; }

            public string StringBody { get; set; }

            public byte[] BytesBody { get; set; }

            public List<string> SignHeaderPrefixList { get; set; }
        }
    }
}