using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Org.BouncyCastle.Asn1.Ocsp;
using PTMedicalInsurance.Common;
using PTMedicalInsurance.Variables;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Security.Cryptography;
using System.Security.Policy;
using System.Text;
using System.Threading.Tasks;

namespace PTMedicalInsurance.Helper
{
    class InvokeRestCenter : IInvokeCenter
    {
        private static string GetRandomString(int length)
        {
            const string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            var random = new Random();
            return new string(Enumerable.Repeat(chars, length)
              .Select(s => s[random.Next(s.Length)]).ToArray());
        }

        private static long GetCurrentUnixSeconds()
        {
            DateTimeOffset utcNow = DateTimeOffset.UtcNow.AddHours(8);
            return (long)(utcNow.ToUniversalTime().DateTime.Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc))).TotalSeconds;
        }

        private static string GetSHA256Str(string input)
        {
            using (SHA256 sha256Hash = SHA256.Create())
            {
                byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(input));
                StringBuilder builder = new StringBuilder();
                foreach (byte b in bytes)
                {
                    builder.Append(b.ToString("x2"));
                }
                return builder.ToString();
            }
        }

        public int Business(string inputData, ref string outputData, ref string pErrMsg)
        {
            outputData = "";
            pErrMsg = "";
            
            JObject joRtn = new JObject();
            try
            {
                if (string.IsNullOrEmpty(Global.curEvt.URL))
                {
                    Global.curEvt.URL = Global.inf.centerURL;
                }
                //创建一个HTTP请求  
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Global.curEvt.URL);
                //Post请求方式  
                request.Method = "POST";
                //设置头部信息
                string headstr = @"Bearer " + Global.curEvt.token;//市医保token
                request.Headers.Add("Authorization", headstr);
                //内容类型
                request.ContentType = "application/json";
                //设置参数，并进行URL编码 
                string paraUrlCoded = inputData;//System.Web.HttpUtility.UrlEncode(jsonParas);   
                byte[] payload;
                //将Json字符串转化为字节  
                payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
                //设置请求的ContentLength   
                request.ContentLength = payload.Length;
                //发送请求，获得请求流 
                Stream writer;
                writer = request.GetRequestStream();//获取用于写入请求数据的Stream对象
                                                    //将请求参数写入流
                writer.Write(payload, 0, payload.Length);
                writer.Close();//关闭请求流
                HttpWebResponse response = null;
                try
                {
                    //获得响应流
                    response = (HttpWebResponse)request.GetResponse();
                }
                catch (WebException ex)
                {
                    HttpWebResponse res = (HttpWebResponse)ex.Response;
                    Stream myResponseStream = res.GetResponseStream();
                    StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
                    string retString = myStreamReader.ReadToEnd();
                    outputData = JsonHelper.setExceptionJson(-99, "异常返回", retString).ToString();
                    return -1;
                }
                outputData = getResponseData(response);
                joRtn = JObject.Parse(outputData);//返回Json数据
                if (joRtn.ContainsKey("body"))
                {
                    joRtn = (JObject)joRtn.GetValue("body");
                    outputData = JsonHelper.toJsonString(joRtn);
                }
                return 0;
            }
            catch (Exception ex)
            {
                joRtn.Add("infcode", -1);
                joRtn.Add("err_msg", "调用中心服务异常invokeCenterService(1):" + ex.Message);
                outputData = JsonHelper.toJsonString(joRtn);
                return -1;
            }
        }

        public int BusinessExt(string inputData, ref string outputData, ref string pErrMsg)
        {
            return this.Business(inputData, ref outputData, ref pErrMsg);
        }

        //public int DownloadFile(string inputData, ref string outputData)
        //{
        //    outputData = "";
        //    string error = string.Empty; int errorCode = 0;
        //    try
        //    {
        //        JObject jsonInParam = JObject.Parse(inputData);
        //        // 去除外wrapper层便于通用
        //        Utils.removeWrapper(jsonInParam);

        //        string fileName = (string)jsonInParam["input"]["fsDownloadIn"]["filename"];
        //        string filePath = Global.curEvt.path + "\\Download\\" + fileName;

        //        //如果不存在目录，则创建目录
        //        if (!Directory.Exists(Global.curEvt.path + "\\Download"))
        //        {
        //            //创建文件夹
        //            DirectoryInfo dirInfo = Directory.CreateDirectory(Global.curEvt.path + "\\Download");
        //        }
        //        if (File.Exists(filePath))
        //        {
        //            File.Delete(filePath);
        //        }

        //        FileStream fs = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
        //        //创建一个HTTP请求  
        //        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Global.curEvt.URL);
        //        //Post请求方式  
        //        request.Method = "POST";


        //        //设置参数，并进行URL编码 
        //        string paraUrlCoded = JsonHelper.toJsonString(jsonInParam);
        //        byte[] payload;
        //        //将Json字符串转化为字节  
        //        payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
        //        //设置请求的ContentLength   
        //        request.ContentLength = payload.Length;
        //        Stream writer;
        //        try
        //        {
        //            writer = request.GetRequestStream();//获取用于写入请求数据的Stream对象
        //        }
        //        catch (Exception)
        //        {
        //            writer = null;
        //            errorCode = -100;
        //            error = "连接服务器失败!";
        //        }
        //        //将请求参数写入流
        //        writer.Write(payload, 0, payload.Length);
        //        writer.Close();//关闭请求流
        //                       // String strValue = "";//strValue为http响应所返回的字符流
        //                       //发送请求并获取相应回应数据
        //        HttpWebResponse response = request.GetResponse() as HttpWebResponse;
        //        //直到request.GetResponse()程序才开始向目标网页发送Post请求
        //        Stream responseStream = response.GetResponseStream();
        //        //创建本地文件写入流
        //        byte[] bArr = new byte[102400];
        //        int iTotalSize = 0;
        //        int size = responseStream.Read(bArr, 0, (int)bArr.Length);
        //        while (size > 0)
        //        {
        //            iTotalSize += size;
        //            fs.Write(bArr, 0, size);
        //            size = responseStream.Read(bArr, 0, (int)bArr.Length);
        //        }
        //        fs.Close();
        //        responseStream.Close();
        //        dynamic joReturn = new JObject();
        //        joReturn.errorCode = errorCode;
        //        joReturn.errorMessage = error;
        //        joReturn.filePath = filePath;
        //        outputData = joReturn.ToString();
        //    }
        //    catch (Exception ex)
        //    {
        //        errorCode = -100;
        //        error = ex.Message;
        //        dynamic joReturn = new JObject();
        //        joReturn.errorCode = errorCode;
        //        joReturn.errorMessage = error;
        //        outputData = joReturn.ToString();
        //        return -1;
        //    }
        //    finally
        //    {
        //        Global.writeLog("DownloadCenterFile" + "(" + Global.curEvt.URL + ")", inputData, outputData);
        //    }
        //    return 0;
        //}


        public int DownloadFile(string inputData, ref string outputData)
        {
            outputData = "";
            int errorCode = 0;
            string error = string.Empty;
            string filePath = "";

            HttpWebResponse response = null;
            FileStream fs = null;

            try
            {
                JObject jsonInParam = JObject.Parse(inputData);
                Utils.removeWrapper(jsonInParam);

                string fileName = (string)jsonInParam["input"]["fsDownloadIn"]["filename"];
                if (string.IsNullOrWhiteSpace(fileName))
                {
                    errorCode = -101;
                    error = "文件名不能为空";
                    throw new ArgumentException(error);
                }

                string downloadDir = Path.Combine(Global.curEvt.path, "Download");
                filePath = Path.Combine(downloadDir, fileName);

                // 创建目录
                if (!Directory.Exists(downloadDir))
                {
                    Directory.CreateDirectory(downloadDir);
                }

                // 删除旧文件
                if (File.Exists(filePath))
                {
                    File.Delete(filePath);
                }

                // 准备 POST 请求
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Global.inf.downURL);
                request.Method = "POST";
                request.ContentType = "application/json; charset=utf-8";
                //request.UserAgent = "DownloadClient/1.0";

                // 添加 Authorization 头
                string headstr = @"Bearer " + Global.curEvt.token;//市医保token
                request.Headers.Add("Authorization", headstr);


                string requestBody = JsonHelper.toJsonString(jsonInParam);
                byte[] payload = Encoding.UTF8.GetBytes(requestBody);
                request.ContentLength = payload.Length;

                // 写入请求体
                using (Stream requestStream = request.GetRequestStream())
                {
                    requestStream.Write(payload, 0, payload.Length);
                }

                // 获取响应
                response = (HttpWebResponse)request.GetResponse();

                // ✅ 关键：记录状态码和 Content-Type
                string statusCode = $"{(int)response.StatusCode} {response.StatusCode}";
                string contentType = response.ContentType?.ToLower() ?? "";
                Global.writeLog("DownloadFile_Response",
                    $"StatusCode: {statusCode}\r\n" ,
                    $"Content-Type: {contentType}");

                // ✅ 判断是否可能是错误响应（即使 200 OK）
                bool isJsonOrError = contentType.Contains("json") ||
                                     contentType.Contains("text") ||
                                     response.ContentLength < 1024; // 小文件很可能是错误信息

                using (Stream responseStream = response.GetResponseStream())
                using (fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
                {
                    byte[] buffer = new byte[8192];
                    int bytesRead;
                    long totalBytesRead = 0;
                    MemoryStream firstChunk = new MemoryStream(); // 仅缓存前 1KB 用于判断

                    while ((bytesRead = responseStream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        // 累计写入文件
                        fs.Write(buffer, 0, bytesRead);
                        totalBytesRead += bytesRead;

                        // ✅ 仅在开始时缓存前 1KB 用于错误判断
                        if (totalBytesRead <= 1024)
                        {
                            firstChunk.Write(buffer, 0, bytesRead);
                        }
                    }

                    // 文件已完整写入磁盘，现在检查前 1KB 是否为错误信息
                    if (isJsonOrError || totalBytesRead < 1024)
                    {
                        string firstContent = Encoding.UTF8.GetString(firstChunk.ToArray());
                        firstContent = firstContent.Trim();

                        // 判断是否为 JSON 错误
                        if (firstContent.StartsWith("{") &&
                            (firstContent.Contains("\"code\"") ||
                             firstContent.Contains("err_msg")))
                        {
                            try
                            {
                                var errorObj = JObject.Parse(firstContent);
                                int? errCode = errorObj["code"]?.Value<int?>() ??
                                               errorObj["infcode"]?.Value<int?>();

                                if (errCode != null && errCode != 0 && errCode != 200)
                                {
                                    string errMsg = errorObj["err_msg"]?.Value<string>() ??
                                                  errorObj["errorMessage"]?.Value<string>() ??
                                                  "Unknown error";

                                    throw new Exception($"业务错误 [{errCode}]: {errMsg}");
                                }
                            }
                            catch (JsonException)
                            {
                                // 不是 JSON，但内容可疑
                                throw new Exception("服务器返回错误内容，非有效文件: " + firstContent);
                            }
                        }
                    }
                }

                // ✅ 成功：返回结果
                dynamic joReturn = new JObject();
                joReturn.errorCode = 0;
                joReturn.errorMessage = "";
                joReturn.filePath = filePath;
                joReturn.fileSize = new FileInfo(filePath).Length;
                outputData = joReturn.ToString();

                return 0;
            }
            catch (WebException webEx)
            {
                Global.writeLog($"进入异常 + {webEx}");
                // 处理 HTTP 层错误
                if (webEx.Response is HttpWebResponse errResponse)
                {
                    using (var sr = new StreamReader(errResponse.GetResponseStream()))
                    {
                        string serverMsg = sr.ReadToEnd();
                        errorCode = (int)errResponse.StatusCode;
                        error = $"请求失败 :{webEx} [{errResponse.StatusCode}]: {serverMsg}";
                    }
                }
                else
                {
                    errorCode = -100;
                    error = "连接服务器失败: " + webEx.Message;
                }
            }
            catch (JsonException jsonEx)
            {
                errorCode = -200;
                error = "输入数据格式错误: " + jsonEx.Message;
            }
            catch (UnauthorizedAccessException accEx)
            {
                errorCode = -300;
                error = "无权访问文件或目录: " + accEx.Message;
            }
            catch (IOException ioEx)
            {
                errorCode = -400;
                error = "文件操作失败: " + ioEx.Message;
            }
            catch (Exception ex) when (errorCode == 0)
            {
                errorCode = -999;
                error = "未知错误: " + ex.Message;
            }
            finally
            {
                response?.Close();

                if (string.IsNullOrEmpty(outputData))
                {
                    dynamic joReturn = new JObject();
                    joReturn.errorCode = errorCode;
                    joReturn.errorMessage = error;
                    if (!string.IsNullOrEmpty(filePath)) joReturn.filePath = filePath;
                    outputData = joReturn.ToString();
                }

                Global.writeLog($"DownloadFile({Global.inf.downURL})", inputData, outputData);
            }

            return -1;
        }

        public void Test1(string DownInput)
        {
            HttpClient httpClient = null;
            HttpResponseMessage response = null;
            try
            {
                // 创建 HttpClient 并设置超时
                var handler = new HttpClientHandler();
                httpClient = new HttpClient(handler)
                {
                    Timeout = TimeSpan.FromSeconds(10) // 连接 + 响应超时
                };

                // 构造请求内容
                var content = new StringContent(DownInput, Encoding.UTF8, "text/plain");
                content.Headers.ContentType = new MediaTypeHeaderValue("text/plain");
                // 添加 Authorization 头
                string headstr = "Bearer " + Global.curEvt.token; // 市医保 token
                                                                  //httpClient.DefaultRequestHeaders.Authorization =
                                                                  //    new AuthenticationHeaderValue("Bearer", Global.curEvt.token);
                                                                  // 或者使用：
                httpClient.DefaultRequestHeaders.Add("Authorization", headstr);

                // 发送 POST 请求（同步等待）
                response = httpClient.PostAsync(Global.inf.centerURL, content).GetAwaiter().GetResult();

                // 检查状态码
                if (response.StatusCode != System.Net.HttpStatusCode.OK)
                {
                    throw new HttpRequestException($"HTTP 请求失败，状态码: {response.StatusCode}");
                }

                // 读取 Content-Type 判断响应类型
                var contentType = response.Content.Headers.ContentType?.MediaType ?? "";

                if (contentType.Contains("application/octet-stream"))
                {
                    // 情况1：返回的是文件流（二进制流）
                    using (var responseStream = response.Content.ReadAsStreamAsync().GetAwaiter().GetResult())
                    using (var fileStream = new FileStream("testDownload.txt", FileMode.Create, FileAccess.Write))
                    {
                        responseStream.CopyTo(fileStream);
                    }
                    Global.writeLog("文件已下载到 testDownload.txt");
                }
                else
                {
                    // 情况2：返回的是字符串（如 JSON）
                    string result = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
                    Global.writeLog("Test1:" + result);
                }
            }
            catch (AggregateException ax) when (ax.InnerException is TimeoutException)
            {
                throw new TimeoutException("请求超时", ax.InnerException);
            }
            catch (HttpRequestException e)
            {
                throw new Exception("HTTP 请求异常: " + e.Message, e);
            }
            catch (Exception e)
            {
                throw new Exception("发生未知错误: " + e.Message, e);
            }
            finally
            {
                // 手动释放资源
                response?.Dispose();
                httpClient?.Dispose();
            }
        }
        public int Init(ref string pErrMsg)
        {
            return 0;
        }

        public int UploadFile(string inputData, ref string outputData, ref string pErrMsg)
        {
            throw new NotImplementedException();
        }


        private string getResponseData(HttpWebResponse response)
        {
            string data = "";
            if (response != null)
            {
                Stream s = response.GetResponseStream();
                StreamReader sRead = new StreamReader(s,Encoding.GetEncoding("UTF-8"));
                data = sRead.ReadToEnd();
                sRead.Close();
                response.Close();
            }
            return data;
        }

    }
}