using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

namespace HealthMonitor.Common.helper
{

    public class HttpHelper
    {
        private readonly IHttpClientFactory _httpClientFactory;
        private readonly ILogger<HttpHelper> _logger;

        public HttpHelper(IHttpClientFactory httpClientFactory, ILogger<HttpHelper> logger)
        {
            _httpClientFactory = httpClientFactory;
            _logger = logger;

            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult!);
        }


        public static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true;
        }

        public async Task<string?> HttpToGetAsync(string url)
        {
            return await HttpToGetAsync(url, new List<KeyValuePair<string, string>>());
        }

        public async Task<string?> HttpToGetAsync(string url, List<KeyValuePair<string, string>> headers)
        {
            var client = _httpClientFactory.CreateClient(Consts.DEFAULT_HTTPCLIENT_NAME);
            if (headers != null && headers.Count > 0)   //指定请求头
            {
                headers.ForEach(e =>
                {
                    client.DefaultRequestHeaders.Add(e.Key, e.Value);
                });
            }

            try
            {
                using (var response = await client.GetAsync(url).ConfigureAwait(false))
                {
                    if (!response.IsSuccessStatusCode) return null;
                    else
                    {
                        var result = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
                        return result;
                    }
                }
            }
            catch (Exception ex)
            {
                _logger.LogError($"HttpToGetAsync发生异常, Msg:{ex.Message}\n{ex.StackTrace}");
                return null;
            }
        }

        public async Task<string?> HttpToPostAsync(string url, object data)
        {
            return await HttpToPostAsync(url, data, new List<KeyValuePair<string, string>>());
        }

        public async Task<string?> HttpToPostAsync(string url, object data, List<KeyValuePair<string, string>> headers)
        {
            if (data == null) return null;
          
            var client = _httpClientFactory.CreateClient(Consts.DEFAULT_HTTPCLIENT_NAME);
            if (headers != null && headers.Count > 0)   //指定请求头
            {
                headers.ForEach(e =>
                {
                    client.DefaultRequestHeaders.Add(e.Key, e.Value);
                });

            }

            string? body;
            if (data is string) body = data as string;
            else body = JsonConvert.SerializeObject(data);

            try
            {
                using (var content = new StringContent(body!))
                {
                    content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                    using (var response = await client.PostAsync(url, content).ConfigureAwait(false))
                    {
                        if (!response.IsSuccessStatusCode) return null;
                        else
                        {
                            var result = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
                            return result;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                _logger.LogError($"HttpToPostAsync发生异常, Msg:{ex.Message}\n{ex.StackTrace}");
                return null;
            }
        }
        /// <summary>
        /// Authorization 的 Base64 加密
        /// </summary>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <returns></returns>
        public string GetEncodedCredentials(string username, string password)
        {
            string mergedCredentials = string.Format("{0}:{1}", username, password);
            byte[] byteCredentials = UTF8Encoding.UTF8.GetBytes(mergedCredentials);
            return Convert.ToBase64String(byteCredentials);
        }
    }
}