using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Security.Cryptography;
using System.Text;

namespace Infrastructure.Sms
{
    public class NetEasySmsSender : ISmsSender
    {
        private readonly ILogger<NetEasySmsSender> _logger;
        private readonly Uri _appUrl;
        private readonly string _appKey;
        private readonly string _appSecret;
        private readonly IHttpClientFactory _httpClientFactory;

        public NetEasySmsSender(ILogger<NetEasySmsSender> logger, IConfiguration configuration, IHttpClientFactory httpClientFactory)
        {
            if (configuration is null)
            {
                throw new ArgumentNullException(nameof(configuration));
            }

            this._logger = logger;
            this._appUrl = new Uri(configuration.GetSection("sms").GetValue<string>("url"));
            this._appKey = configuration.GetSection("sms").GetValue<string>("key");
            this._appSecret = configuration.GetSection("sms").GetValue<string>("secret");
            this._httpClientFactory = httpClientFactory;
        }

        public void Send(string number, out string code)
        {
            try
            {
#pragma warning disable CA2000 // 丢失范围之前释放对象
                var client = this._httpClientFactory.CreateClient();
#pragma warning restore CA2000 // 丢失范围之前释放对象
                var formData = new List<KeyValuePair<string, string>>
                    {
                        new KeyValuePair<string, string>("AppKey", this._appKey),
                        new KeyValuePair<string, string>("Nonce", Guid.NewGuid().ToString())
                    };
                var seconds = ((long)(DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds).ToString(CultureInfo.InvariantCulture);
                formData.Add(new KeyValuePair<string, string>("CurTime", seconds));
                var sumValue = string.Format(CultureInfo.InvariantCulture, "{0}{1}{2}", this._appSecret, formData[1].Value, formData[2].Value);
                var sumBytes = Encoding.UTF8.GetBytes(sumValue);
#pragma warning disable CA5350 // 不要使用弱加密算法
                using var sha1 = SHA1.Create();
#pragma warning restore CA5350 // 不要使用弱加密算法
                var sumHash = sha1.ComputeHash(sumBytes);
                var hashValue = string.Empty;
                var builder = new StringBuilder();
                builder.Append(hashValue);
                foreach (var item in sumHash)
                {
                    builder.Append(item.ToString("x2", CultureInfo.InvariantCulture));
                }
                hashValue = builder.ToString();
                formData.Add(new KeyValuePair<string, string>("CheckSum", hashValue));
                using var content = new FormUrlEncodedContent(new List<KeyValuePair<string, string>> { new KeyValuePair<string, string>("mobile", number) });
                foreach (var item in formData)
                {
                    content.Headers.Add(item.Key, item.Value);
                }
                content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded")
                {
                    CharSet = "utf-8"
                };
                var task = client.PostAsync(this._appUrl, content);
                task.Wait();
                var result = task.Result;
                var responseContent = result.Content.ReadAsStringAsync().Result;
                var returnModel = new { code = "", msg = "", obj = "" };
                returnModel = Newtonsoft.Json.JsonConvert.DeserializeAnonymousType(responseContent, returnModel);
                code = returnModel.obj;
            }
            catch (Exception ex)
            {
                this._logger.LogError(ex.Message);
                code = string.Empty;
            }
        }
    }
}