using MQTTnet;
using MQTTnet.Client;
using MQTTnet.Client.Options;
using MQTTnet.Formatter;
using MQTTnet.Implementations;
using MyCore.Models.Meross;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace MyCore.Services
{
    public class MerossService
    {
        // API HTTP
        private const string _merossUrl = "https://iot.meross.com";
        private static string _secret = "23x17ahWarFH6w29";
        private string _loginUrl = $"{_merossUrl}/v1/Auth/Login";
        private string _logUrl = $"{_merossUrl}/v1/log/user";
        private string _devList = $"{_merossUrl}/v1/Device/devList";

        private static string username = "thomas.fransolet@hotmail.be";
        private static string password = "Coconuts07";

        private static ResultToken resultToken;

        // API MQTT
        private const int port = 2001;
        private const string domain = "iot.meross.com";

        private IMqttClient _client;
        private IMqttClientOptions _options;
        private string _userMQTT;
        private string _passwordMQTT;

        public class Credential
        {
            public string email;
            public string password;
        }

        public class ResultToken
        {
            public string userid;
            public string email;
            public string token;
            public string key;
        }

        public enum RequestType
        {
            Login,
            Log,
            DeviceList
        }

        public MerossService()
        {
            
            try
            {
                var loginTask = Task.Run(() => PostURI(new Uri(_loginUrl), RequestType.Login));
                loginTask.Wait();

                if (loginTask.Result != "")
                {
                    var data = ((JObject)JsonConvert.DeserializeObject(loginTask.Result))["data"];
                    resultToken = JsonConvert.DeserializeObject<ResultToken>(data.ToString());

                    var deviceTask = Task.Run(() => PostURI(new Uri(_devList), RequestType.DeviceList));
                    deviceTask.Wait();

                    if (deviceTask.Result != "")
                    {
                        data = ((JObject)JsonConvert.DeserializeObject(deviceTask.Result))["data"];
                        var test = JsonConvert.DeserializeObject<List<MerossDevice>>(data.ToString());
                    }

                    var logTask = Task.Run(() => PostURI(new Uri(_logUrl), RequestType.Log));
                    logTask.Wait();

                    if (logTask.Result != "")
                    {
                        data = ((JObject)JsonConvert.DeserializeObject(logTask.Result))["data"];
                    }

                    //MQTT CONNEXION
                    ConnexionToMqtt();
                }
            }
            catch (Exception e)
            {
                resultToken = null;
            }
        }

        static async Task<string> PostURI(Uri u, RequestType requestType)
        {
            var response = string.Empty;
            var requestParam = "";
            string nonce = GenerateNonce(16).ToUpper();
            var timeStamp = new DateTimeOffset(DateTime.UtcNow).ToUnixTimeSeconds();

            switch (requestType)
            {
                case RequestType.Login:
                    requestParam = Base64Encode(JsonConvert.SerializeObject(new Credential { email = username, password = password }).ToString());
                    break;
                case RequestType.Log:
                    requestParam = Base64Encode("{'extra': { }, 'model': 'Android,Android SDK built for x86_64', 'system': 'Android','uuid': '493dd9174941ed58waitForOpenWifi', 'vendor': 'Meross', 'version': '6.0'}");
                    break;
                case RequestType.DeviceList:
                    requestParam = "e30=";
                    break;
            }

            string stringForMD5 = stringForMD5 = _secret + timeStamp.ToString() + nonce + requestParam;
            string md5 = CreateMD5(stringForMD5);

            var payloadLogin = "{ \"params\":\"" + requestParam + "\",\"sign\":\"" + md5.ToLower() + "\",\"timestamp\":" + timeStamp + ",\"nonce\":\"" + nonce + "\"}";
            using (var client = new HttpClient())
            {
                HttpContent c = new StringContent(payloadLogin, Encoding.UTF8, "application/json");
                if (resultToken != null)
                {
                    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", resultToken.token);
                }
                else
                {
                    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic");
                }

                client.DefaultRequestHeaders.Add("vender", "Meross");
                client.DefaultRequestHeaders.Add("AppVersion", "1.3.0");
                client.DefaultRequestHeaders.Add("AppLanguage", "EN");
                client.DefaultRequestHeaders.Add("User-Agent", "okhttp/3.6.0");

                HttpResponseMessage result = await client.PostAsync(u, c);
                if (result.IsSuccessStatusCode)
                {
                    response = await result.Content.ReadAsStringAsync();
                }
            }
            return response;
        }

        public static string Base64Encode(string plainText)
        {
            var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
            return System.Convert.ToBase64String(plainTextBytes);
        }

        public static string CreateMD5(string input)
        {
            // Use input string to calculate MD5 hash
            using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
            {
                byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
                byte[] hashBytes = md5.ComputeHash(inputBytes);

                // Convert the byte array to hexadecimal string
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < hashBytes.Length; i++)
                {
                    sb.Append(hashBytes[i].ToString("X2"));
                }
                return sb.ToString();
            }
        }

        private static string validChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        private static Random random = new Random();

        private static string GenerateNonce(int length)
        {
            var nonceString = new StringBuilder();
            for (int i = 0; i < length; i++)
            {
                nonceString.Append(validChars[random.Next(0, validChars.Length - 1)]);
            }

            return nonceString.ToString();
        }

        private void ConnexionToMqtt()
        {
            try
            {
                // Create a new MQTT client.
                _client = new MqttFactory().CreateMqttClient();

                string stringForMD5 = resultToken.userid + resultToken.key;
                string hashed_password = CreateMD5(stringForMD5);

                MqttClientOptionsBuilderTlsParameters tlsParameters = new MqttClientOptionsBuilderTlsParameters();
                tlsParameters.UseTls = true;
                tlsParameters.SslProtocol = System.Security.Authentication.SslProtocols.Tls;

                _options = new MqttClientOptionsBuilder()
                    .WithClientId("app: 08d4c9f99da40203ebc798a79512ec14")
                    .WithTcpServer(domain, port)
                    .WithCredentials(resultToken.userid, hashed_password)
                    .WithTls(tlsParameters)
                    .WithProtocolVersion(MqttProtocolVersion.V311)
                    .Build();


                _client.ConnectAsync(_options, CancellationToken.None).ContinueWith(res => {
                    if (res.Status == TaskStatus.RanToCompletion)
                    {
                        Console.WriteLine("It's connected");
                    }
                    else
                    {
                        Console.WriteLine($"Error connecting to {domain}");
                    }
                });


                _client.UseDisconnectedHandler(async e =>
                {
                    Console.WriteLine("### DISCONNECTED FROM SERVER ###");
                    await Task.Delay(TimeSpan.FromSeconds(5));

                    try
                    {
                        await _client.ConnectAsync(_options, CancellationToken.None); // Since 3.0.5 with CancellationToken
                    }
                    catch
                    {
                        Console.WriteLine("### RECONNECTING FAILED ###");
                    }
                });

                _client.UseConnectedHandler(async e =>
                {
                    Console.WriteLine("### CONNECTED WITH SERVER ###");

                    // Subscribe to a topic
                    await _client.SubscribeAsync(new TopicFilterBuilder().WithTopic("#").Build());

                    Console.WriteLine("### SUBSCRIBED ###");
                });

                _client.UseApplicationMessageReceivedHandler(e =>
                {
                    Console.WriteLine("### RECEIVED APPLICATION MESSAGE ###");
                    Console.WriteLine($"+ Topic = {e.ApplicationMessage.Topic}");
                    Console.WriteLine($"+ Payload = {Encoding.UTF8.GetString(e.ApplicationMessage.Payload)}");
                    Console.WriteLine($"+ QoS = {e.ApplicationMessage.QualityOfServiceLevel}");
                    Console.WriteLine($"+ Retain = {e.ApplicationMessage.Retain}");
                    Console.WriteLine();

                });
            }
            catch (Exception e)
            {

            }
        }
    }
}