using Newtonsoft.Json;
using System.Collections.Concurrent;
using System.Net;
using System.Text;
using AmrControl.Common.HttpClients;

namespace AmrControl.Common.HttpClients
{
    /// <summary>
    /// 请求客户端
    /// </summary>
    public class DefaultHttpClient
    {
        /// <summary>
        /// 用于加锁，防止对象重复构建
        /// </summary>
        private static object lockObj = new Object();
        /// <summary>
        /// httpClient，用于http访问
        /// </summary>
        private readonly HttpClient _httpClient;
        /// <summary>
        /// get客户端
        /// </summary>
        private readonly HttpGet httpGet;
        /// <summary>
        /// post客户端
        /// </summary>
        private readonly HttpPost httpPost;
        /// <summary>
        /// put操作客户端
        /// </summary>
        private readonly HttpPut httpPut;
        /// <summary>
        /// delete客户端
        /// </summary>
        private readonly HttpDelete httpDelete;
        /// <summary>
        /// 地址终端维护
        /// </summary>
        private static volatile ConcurrentDictionary<string, DefaultHttpClient> clients = new();

        //域名+地址，如http://127.0.0.1:5089/
        private readonly string baseUri;
        /// <summary>
        /// 私有化构造方法
        /// </summary>
        private DefaultHttpClient(string hostAddr)
        {
            var socketsHttpHandler = new SocketsHttpHandler()
            {
                //每个请求最大连接数
                MaxConnectionsPerServer = 128,
                //连接池中TCP连接最多可以闲置多久,设置180秒超时回收
                PooledConnectionIdleTimeout = TimeSpan.FromSeconds(180),
                //连接超时，默认60s
                ConnectTimeout = TimeSpan.FromSeconds(60),
                // http响应头最大字节数（单位：KB）
                MaxResponseHeadersLength = 128,
                //启用压缩
                AutomaticDecompression = DecompressionMethods.GZip,
            };
            _httpClient = new(socketsHttpHandler)
            {
                //等待响应超时时间，默认：100秒。
                Timeout = TimeSpan.FromSeconds(60)
            };
            this.baseUri = hostAddr;
            this.httpGet = new HttpGet(_httpClient, hostAddr);
            this.httpPost = new HttpPost(_httpClient, hostAddr);
            this.httpPut = new HttpPut(_httpClient, hostAddr);
            this.httpDelete = new HttpDelete(_httpClient, hostAddr);
        }

        /// <summary>
        /// 获取httpGet客户端
        /// </summary>
        /// <returns></returns>
        public HttpGet httpGetClient()
        {
            return httpGet;
        }

        /// <summary>
        /// 获取httpPost客户端
        /// </summary>
        /// <returns></returns>
        public HttpPost httpPostClient()
        {
            return httpPost;
        }
        /// <summary>
        /// 获取httpPut客户端
        /// </summary>
        /// <returns></returns>
        public HttpPut httpPutClient()
        {
            return httpPut;
        }
        /// <summary>
        /// 获取httpDelete客户端
        /// </summary>
        /// <returns></returns>
        public HttpDelete httpDeleteClient()
        {
            return httpDelete;
        }
        /// <summary>
        /// 获取客户端
        /// </summary>
        /// <returns></returns>
        public static DefaultHttpClient getClient(string baseUri)
        {
            if (!clients.ContainsKey(baseUri) || clients[baseUri] == null)
            {
                //尝试获取锁
                lock (lockObj)
                {
                    //再次校验，防止重复构建
                    if (!clients.ContainsKey(baseUri) || clients[baseUri] == null)
                    {
                        clients[baseUri] = new DefaultHttpClient(baseUri);
                    }
                }
            }
            return clients[baseUri];
        }
    }
}