using System.Net.Http.Headers;
using System.Text;
using JNPF.Logging;
using Microsoft.AspNetCore.WebUtilities;
using Newtonsoft.Json;

namespace Tnb.Common.Utils
{
    public class ApiException : Exception
    {
        public int StatusCode { get; set; }

        public string Content { get; set; }
    }
    /// <summary>
    /// Http请求帮助类
    /// added by ly on 20230801
    /// </summary>
    public class HttpClientHelper
    {
        private static readonly HttpClient HttpClient = new HttpClient();
        private static Dictionary<string, HttpClient> HttpClientDict = new Dictionary<string, HttpClient>(StringComparer.OrdinalIgnoreCase);
        public static string Url { get; private set; }

        public static async Task<string> HttpPostAsync(string url, string clientKey, string postData = null, Dictionary<string, string> headers = null, string contentType = "application/json", int timeOut = 30)
        {
            using var client = HttpClientDict[clientKey];
            if (headers != null)
            {
                foreach (var header in headers)
                    client.DefaultRequestHeaders.Add(header.Key, header.Value);
            }
            using HttpContent httpContent = new StringContent(postData, Encoding.UTF8);
            if (contentType != null)
                httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);

            var response = await client.PostAsync(url, httpContent);
            return await response.Content.ReadAsStringAsync();
        }


        /// <summary>
        /// 发起POST异步请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <param name="contentType">application/xml、application/json、application/text、application/x-www-form-urlencoded</param>
        /// <param name="headers">填充消息头</param>
        /// <returns></returns>
        public static async Task<string> HttpPostAsync(string url, string postData = null, Dictionary<string, string> headers = null, string contentType = "application/json", int timeOut = 30)
        {
            postData ??= "";
            HttpResponseMessage response = null;
            HttpClient client = null;
            try
            {

                if (client == null)
                    client = new HttpClient();

                //HttpClient.Timeout = new TimeSpan(0, 0, timeOut);
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                //var request = new HttpRequestMessage(HttpMethod.Post, url);
                //request.Headers.Accept.Clear();
                //request.Headers.


                using HttpContent httpContent = new StringContent(postData, Encoding.UTF8);
                if (contentType != null)
                    httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);

                response = await client.PostAsync(url, httpContent);
            }
            catch (Exception ex)
            {
                client = new HttpClient();
            }

            return await response.Content.ReadAsStringAsync();
        }

        public static async Task<string> PostFormDataAsync(string url, Dictionary<string, string> pars)
        {
            var respJson = "";
            try
            {
                var content = new FormUrlEncodedContent(pars);
                var respBody = await HttpClient.PostAsync(url, content);
                respJson = await respBody.Content.ReadAsStringAsync();
            }
            catch (Exception ex)
            {
                Log.Error("调用PostFormDataAsync时出错", ex);
            }
            return respJson;
        }
        public static async Task<string> GetRequestAsync(string url, Dictionary<string, string> pars = null)
        {
            HttpClient Client = new HttpClient();
            var reqUri = url;
            if (pars?.Count > 0)
            {
                reqUri = QueryHelpers.AddQueryString(url, pars);
                //await Console.Out.WriteLineAsync(reqUri);
            }
            Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            var respBody = await Client.GetAsync(reqUri);
            var result = await respBody.Content.ReadAsStringAsync();
            return result;
        }

        public static async Task<string> GetAsync(string url, Dictionary<string, string> headers = null, Dictionary<string, string> pars = null)
        {
            var reqUri = url;
            if (pars?.Count > 0)
            {
                reqUri = QueryHelpers.AddQueryString(url, pars);
                //await Console.Out.WriteLineAsync(reqUri);
            }
            if (headers?.Count > 0)
            {
                foreach (var (k, v) in headers)
                {
                    HttpClient.DefaultRequestHeaders.Add(k, v);
                }
            }
            HttpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            var respBody = await HttpClient.GetAsync(reqUri);
            var result = await respBody.Content.ReadAsStringAsync();
            return result;
        }


        public static async Task<string> PostStreamAsync(string url, object content, CancellationToken cancellationToken)
        {
            using (var client = new HttpClient())
            using (var request = new HttpRequestMessage(HttpMethod.Post, url))
            using (var httpContent = CreateHttpContent(content))
            {
                request.Content = httpContent;

                using (var response = await client
                    .SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken)
                    .ConfigureAwait(false))
                {
                    response.EnsureSuccessStatusCode();
                    return await response.Content.ReadAsStringAsync();
                }

            }
        }


        private static HttpContent CreateHttpContent(object content)
        {
            HttpContent httpContent = null;

            if (content != null)
            {
                var ms = new MemoryStream();
                SerializeJsonIntoStream(content, ms);
                ms.Seek(0, SeekOrigin.Begin);
                httpContent = new StreamContent(ms);
                httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            }

            return httpContent;
        }


        public static void SerializeJsonIntoStream(object value, Stream stream)
        {
            using (var sw = new StreamWriter(stream, new UTF8Encoding(false), 1024, true))
            using (var jtw = new JsonTextWriter(sw) { Formatting = Formatting.None })
            {
                var js = new JsonSerializer();
                js.Serialize(jtw, value);
                jtw.Flush();
            }
        }


        private static T DeserializeJsonFromStream<T>(Stream stream)
        {
            if (stream == null || stream.CanRead == false)
                return default(T);

            using (var sr = new StreamReader(stream))
            using (var jtr = new JsonTextReader(sr))
            {
                var js = new JsonSerializer();
                var searchResult = js.Deserialize<T>(jtr);
                return searchResult;
            }
        }
        private static async Task<string> StreamToStringAsync(Stream stream)
        {
            string content = null;

            if (stream != null)
                using (var sr = new StreamReader(stream))
                    content = await sr.ReadToEndAsync();

            return content;
        }

        private static async Task<List<T>> DeserializeFromStreamCallAsync<T>(CancellationToken cancellationToken)
        {
            using (var client = new HttpClient())
            using (var request = new HttpRequestMessage(HttpMethod.Get, Url))
            using (var response = await client.SendAsync(request, cancellationToken))
            {
                var stream = await response.Content.ReadAsStreamAsync();

                if (response.IsSuccessStatusCode)
                    return DeserializeJsonFromStream<List<T>>(stream);

                var content = await StreamToStringAsync(stream);
                throw new ApiException
                {
                    StatusCode = (int)response.StatusCode,
                    Content = content
                };
            }
        }

        private static async Task<List<T>> DeserializeOptimizedFromStreamCallAsync<T>(CancellationToken cancellationToken)
        {
            using (var client = new HttpClient())
            using (var request = new HttpRequestMessage(HttpMethod.Get, Url))
            using (var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken))
            {
                var stream = await response.Content.ReadAsStreamAsync();

                if (response.IsSuccessStatusCode)
                    return DeserializeJsonFromStream<List<T>>(stream);

                var content = await StreamToStringAsync(stream);
                throw new ApiException
                {
                    StatusCode = (int)response.StatusCode,
                    Content = content
                };
            }
        }

    }
}