using System.Security.Claims;
using System.Security.Cryptography;
using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
using static System.Net.Mime.MediaTypeNames;
using Microsoft.Net.Http.Headers;
using Microsoft.Extensions.Configuration;
using NPOI.SS.Formula.Functions;
using System.Net.Http;
using Flurl.Http.Configuration;
using System.Net;
using QuzrtzJob.Factory;

namespace OASystem.API.OAMethodLib.APNs
{
    public enum NotificationType : int
    {
        Alert = 0,
        Sound = 1,
        Badge = 2,
        Silent = 3
    }

    /// <summary>
    /// APNs 生成 JWT token，添加服务的时候，使用单利
    /// </summary>
    public class APNsService : IAPNsService
    {
        static string token = null;
        static string baseUrl = null;

        private readonly ILogger<APNsService> _logger;
        //private static readonly HttpClient _httpClientFactory = new HttpClient { BaseAddress = new Uri("https://api.push.apple.com:443/3/device/") };
        private readonly IConfiguration _configuration;
        //private readonly IHttpClientFactory _httpClientFactory;
        public APNsService(ILogger<APNsService> logger,IConfiguration configuration)
        {
            this._configuration = configuration;
            //this._httpClientFactory = httpClientFactory;
            //APNsService.baseUrl = this._configuration["apple:pushNotificationServer"];
            //APNsService.baseUrl = this._configuration["apple:pushNotificationServer_Production"];
            //
            //APNsService.baseUrl = string.Format("https://api.push.apple.com:443/3/device/");
            _logger = logger;
        }

        /// <summary>
        /// 生成 APNs JWT token
        /// </summary>
        /// <returns></returns>
        public string GetnerateAPNsJWTToken()
        {
            return this.GetnerateAPNsJWTToken(APNsService.token);
        }

        /// <summary>
        /// 生成 APNs JWT token
        /// </summary>
        /// <returns></returns>
        private string GetnerateAPNsJWTToken(string oldToken)
        {
            var tokenHandler = new JwtSecurityTokenHandler();
            var iat = ((DateTime.UtcNow.Ticks - new DateTime(1970, 1, 1).Ticks) / TimeSpan.TicksPerSecond);

            // 判断原 token 是否超过 50 分钟，如果未超过，直接返回
            if (string.IsNullOrWhiteSpace(oldToken) == false)
            {
                JwtPayload oldPayload = tokenHandler.ReadJwtToken(oldToken).Payload;
                var oldIat = oldPayload.Claims.FirstOrDefault(c => c.Type == "iat");
                if (oldIat != null)
                {
                    if (long.TryParse(oldIat.Value, out long oldIatValue) == true)
                    {
                        // 两次间隔小于 50 分钟，使用原 token
                        if ((iat - oldIatValue) < (50 * 60))
                        {
                            return oldToken;
                        }
                    }
                }
            }

            var kid = _configuration["apple:kid"];
            var securityKey = _configuration["apple:securityKey"].Replace("\n", "");
            var iss = _configuration["apple:iss"];
            var claims = new Claim[]
            {
                new Claim("iss", iss),
                new Claim("iat", iat.ToString())
            };

            try
            {
                var eCDsa = ECDsa.Create();

                eCDsa.ImportPkcs8PrivateKey(Convert.FromBase64String(securityKey), out _);

                var key = new ECDsaSecurityKey(eCDsa);

                key.KeyId = kid;

                var signingCredentials = new SigningCredentials(key, SecurityAlgorithms.EcdsaSha256);
                var jwtHeader = new JwtHeader(signingCredentials);
                var jwtPayload = new JwtPayload(claims);

                var jwtSecurityToken = new JwtSecurityToken(jwtHeader, jwtPayload);

                APNsService.token = tokenHandler.WriteToken(jwtSecurityToken);
            }
            catch (Exception ex)
            {
                return $"[ECDsa] ExMsg:[{ex.Message}]";
            }
            
            return APNsService.token;
        }

        /// <summary>
        /// 发送推送通知
        /// </summary>
        /// <param name="apnsTopic">APP Id</param>
        /// <param name="deviceToken">设备标识</param>
        /// <param name="type">通知类型</param>
        /// <param name="title">标题</param>
        /// <param name="subtitle">子标题</param>
        /// <param name="body">通知内容</param>
        /// <returns></returns>
        public async Task<Result> PushNotification(string apnsTopic, string deviceToken, NotificationType type, string title, string subtitle, string body)
        {
            Result result = new Result() { Code = -1, Msg = "[PushNotification] Start" };

            result.Msg += "\r\n[PushNotification] Start";
            _logger.LogInformation($"[PushNotification] Start");
            var responseData = FailedAPNsReponseData();
            var token = this.GetnerateAPNsJWTToken();

            try
            {
                var _httpClientFactory = new HttpClient { BaseAddress = new Uri("https://api.push.apple.com:443/3/device/") };
                result.Msg += $"\r\n[PushNotification] --> [HttpClient] --> Init --> jsonStr:{JsonConvert.SerializeObject(_httpClientFactory)}";

                var httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, APNsService.baseUrl + deviceToken)
                {
                    Headers =
                    {
                        { HeaderNames.Authorization, "bearer " +  token },
                        { "apns-topic", apnsTopic },
                        { "apns-expiration", "0" }
                    },
                    Version = new Version(2, 0)
                };
                result.Msg += $"\r\n[PushNotification] --> [httpRequestMessage] --> Init --> jsonStr:{JsonConvert.SerializeObject(httpRequestMessage)}";
                var notContent = new
                {
                    aps = new
                    {
                        alert = new
                        {
                            title = title,
                            subtitle = subtitle,
                            body = body
                        }
                    }
                };
                //var content = new StringContent(JsonSerializerTool.SerializeDefault(notContent), System.Text.Encoding.UTF8, Application.Json);

                var content = new StringContent(System.Text.Json.JsonSerializer.Serialize(notContent), System.Text.Encoding.UTF8, Application.Json);

                httpRequestMessage.Content = content;

                result.Msg += $"\r\n[PushNotification] --> [httpRequestMessage] --> Content --> jsonStr:{JsonConvert.SerializeObject(httpRequestMessage)}";
                try
                {
                    //ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls13;

                    //HttpClientHandler handler = new HttpClientHandler()
                    //{
                    //    Proxy = new WebProxy("https://api.push.apple.com:443/3/device/"),
                    //    SslProtocols = System.Security.Authentication.SslProtocols.Tls12, // Enforce TLS 1.2
                    //    UseProxy = true
                    //};
                    //HttpClient client = new HttpClient(handler);

                    //var httpResponseMessage = await client.SendAsync(httpRequestMessage);
                    var httpResponseMessage = await _httpClientFactory.SendAsync(httpRequestMessage);

                    if (httpResponseMessage.IsSuccessStatusCode)
                    {
                        responseData.Code = 200;
                        result.Code = 0;
                        result.Msg = "";
                        result.Data = responseData;
                        result.Msg += $"\r\n[PushNotification] End jsonStr[{JsonConvert.SerializeObject(result)}]";
                        return result;
                    }
                    else
                    {
                        responseData.Data = httpResponseMessage.StatusCode;
                        result.Code = -2;
                        result.Msg = "";
                        result.Data = responseData;
                        result.Msg += $"\r\n[PushNotification] End jsonStr[{JsonConvert.SerializeObject(result)}]";

                        return result;
                    }
                }
                catch (Exception e)
                {
                    responseData.Data = e.Message;
                    result.Code = -3;
                    result.Msg = "";
                    result.Data = responseData;

                    result.Msg += $"\r\n[PushNotification] --> [httpClientFactory] ExceptionMsg:{e.Message}";
                    result.Msg += $"\r\n[PushNotification] --> [httpClientFactory] InnerExceptionData:{e.InnerException}";
                    result.Msg += $"\r\n[PushNotification] --> [httpClientFactory] InnerExceptionMsg:{e.InnerException.Message}";
                    return result;
                }
            }
            catch (Exception ex)
            {
                result.Msg += $"\r\n[PushNotification] InnerExceptionData:{JsonConvert.SerializeObject(ex.InnerException)}";
                result.Msg += $"\r\n[PushNotification] InnerExceptionMsg:{ex.InnerException.Message}";
            }


            return result;
        }

        public APNsReponseData FailedAPNsReponseData()
        {
            return new APNsReponseData() { Code = 400, Data = "" };
        }
    }

    public class APNsReponseData
    {
        public int Code { get; set; } = 0;

        public object Data { get; set; } = "";

    }


}