using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http.Headers;
using System.Security.Policy;
using System.Text;
using System.Threading.Tasks;
using WIDESEAWCS_Core.Const;
using WIDESEAWCS_Core.LogHelper;

namespace WIDESEAWCS_Core.Helper
{
    public class HttpHelper
    {
        /// <summary>
        /// 异步发送HTTP GET请求并返回响应内容
        /// </summary>
        /// <param name="serviceAddress">请求的服务地址</param>
        /// <param name="contentType">响应内容类型，默认为application/json</param>
        /// <param name="headers">请求头字典，可选参数</param>
        /// <returns>返回请求结果的字符串内容</returns>
        /// <exception cref="Exception">当请求过程中发生错误时抛出异常</exception>
        /// <remarks>
        /// 方法会自动记录请求日志，包含请求地址、响应内容和耗时等信息
        /// 默认请求超时时间为60秒
        /// </remarks>
        public static async Task<string> GetAsync(string serviceAddress, string contentType = "application/json", int timeOut = CommunicationConst.HttpDefaultTimeoutSeconds, Dictionary<string, string>? headers = null)
        {
            string result = string.Empty;
            DateTime beginDate = DateTime.Now;
            try
            {
                using HttpClient httpClient = new HttpClient();
                httpClient.Timeout = new TimeSpan(0, 0, timeOut);

                if (headers != null)
                {
                    foreach (var header in headers)
                        httpClient.DefaultRequestHeaders.Add(header.Key, header.Value);
                }

                HttpResponseMessage response = await httpClient.GetAsync(serviceAddress);
                result = await response.Content.ReadAsStringAsync();
                return result;
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                Logger.Add(serviceAddress, "", result, beginDate);
            }
        }

        /// <summary>
        /// 异步发送HTTP POST请求
        /// </summary>
        /// <param name="serviceAddress">服务地址</param>
        /// <param name="requestJson">请求JSON数据</param>
        /// <param name="contentType">内容类型，默认为application/json</param>
        /// <param name="headers">请求头字典</param>
        /// <returns>返回响应内容字符串，失败时抛出异常</returns>
        /// <remarks>
        /// 自动记录请求日志，包含请求地址、请求数据、响应数据和耗时
        /// </remarks>
        public static async Task<string?> PostAsync(string serviceAddress, string requestJson = null, string contentType = "application/json", int timeOut = CommunicationConst.HttpDefaultTimeoutSeconds, Dictionary<string, string>? headers = null)
        {
            string result = string.Empty;
            DateTime beginDate = DateTime.Now;
            try
            {
                if (string.IsNullOrEmpty(requestJson))
                {
                    requestJson = "";
                }

                using (HttpContent httpContent = new StringContent(requestJson))
                {
                    httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                    using HttpClient httpClient = new HttpClient();
                    httpClient.Timeout = new TimeSpan(0, 0, timeOut);

                    if (headers != null)
                    {
                        foreach (var header in headers)
                            httpClient.DefaultRequestHeaders.Add(header.Key, header.Value);
                    }

                    HttpResponseMessage response = await httpClient.PostAsync(serviceAddress, httpContent);
                    result = await response.Content.ReadAsStringAsync();
                }
                return result;
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                Logger.Add(serviceAddress, requestJson == null ? "" : requestJson, result, beginDate);
            }
        }

        /// <summary>
        /// 发送HTTP GET请求到指定服务地址
        /// </summary>
        /// <param name="serviceAddress">请求的服务地址</param>
        /// <param name="contentType">请求内容类型，默认为application/json</param>
        /// <param name="headers">请求头字典，可选参数</param>
        /// <returns>返回服务响应字符串</returns>
        /// <exception cref="Exception">当请求发生错误时抛出异常</exception>
        /// /// <remarks>
        /// 该方法会自动记录请求日志，包含请求地址、请求数据、响应数据和耗时
        /// </remarks>
        public static string Get(string serviceAddress, string contentType = "application/json", int timeOut = CommunicationConst.HttpDefaultTimeoutSeconds, Dictionary<string, string>? headers = null)
        {
            string result = string.Empty;
            DateTime beginDate = DateTime.Now;
            try
            {
                using HttpClient httpClient = new HttpClient();
                httpClient.Timeout = new TimeSpan(0, 0, timeOut);

                if (headers != null)
                {
                    foreach (var header in headers)
                        httpClient.DefaultRequestHeaders.Add(header.Key, header.Value);
                }

                Task<string> task = httpClient.GetStringAsync(serviceAddress);
                result = task.GetAwaiter().GetResult();
                return result;
            }
            catch (Exception e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                Logger.Add(serviceAddress, "", result, beginDate);
            }
        }

        /// <summary>
        /// 发送HTTP POST请求到指定服务地址
        /// </summary>
        /// <param name="serviceAddress">服务地址URL</param>
        /// <param name="requestJson">请求的JSON数据</param>
        /// <param name="contentType">内容类型，默认为application/json</param>
        /// <param name="headers">请求头字典</param>
        /// <returns>返回服务端响应内容</returns>
        /// <exception cref="Exception">当请求发生异常时抛出</exception>
        /// <remarks>
        /// 该方法会自动记录请求日志，包含请求地址、请求数据、响应数据和耗时
        /// </remarks>
        public static string Post(string serviceAddress, string requestJson = null, string contentType = "application/json", int timeOut = CommunicationConst.HttpDefaultTimeoutSeconds, Dictionary<string, string>? headers = null)
        {
            string result = string.Empty;
            DateTime beginDate = DateTime.Now;
            try
            {
                if (string.IsNullOrEmpty(requestJson))
                {
                    requestJson = "";
                }

                using (HttpContent httpContent = new StringContent(requestJson))
                {
                    httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                    using HttpClient httpClient = new HttpClient();
                    httpClient.Timeout = new TimeSpan(0, 0, timeOut);

                    if (headers != null)
                    {
                        foreach (var header in headers)
                            httpClient.DefaultRequestHeaders.Add(header.Key, header.Value);
                    }

                    Task<HttpResponseMessage> postTask = httpClient.PostAsync(serviceAddress, httpContent);
                    HttpResponseMessage message = postTask.GetAwaiter().GetResult();
                    if (message.StatusCode == HttpStatusCode.OK)
                    {
                        Task<string> readTask = message.Content.ReadAsStringAsync();
                        result = readTask.GetAwaiter().GetResult();
                    }
                    else
                    {
                        result = ("异常，响应码：" + ((int)message.StatusCode).ToString() + ",原因：" + message.ReasonPhrase);
                        throw new Exception(result);
                    }
                }
                return result;
            }
            catch (Exception e)
            {
                result = "异常，" + e.Message;

                throw new Exception(e.Message);
            }
            finally
            {
                Logger.Add(serviceAddress, requestJson == null ? "" : requestJson, result, beginDate);
            }
        }
    }
}