using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNet.SignalR;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.OptionsModel;
using Newtonsoft.Json;
using Yavsc.Interfaces.Workflow;
using Yavsc.Models;
using Yavsc.Models.Google.Messaging;
using Yavsc.Models.Haircut;
using Yavsc.Models.Messaging;

namespace Yavsc.Services
{
    public class YavscMessageSender : IYavscMessageSender
    {
        private ILogger _logger;
        IEmailSender _emailSender;
        SiteSettings siteSettings;
        private IHubContext hubContext;
        ApplicationDbContext _dbContext;

        IConnexionManager _cxManager;

        public YavscMessageSender(
            ILoggerFactory loggerFactory,
            IOptions<SiteSettings> sitesOptions,
            IOptions<SmtpSettings> smtpOptions,
            IEmailSender emailSender,
            ApplicationDbContext dbContext,
            IConnexionManager cxManager
        )
        {
            _logger = loggerFactory.CreateLogger<MailSender>();
            _emailSender = emailSender;
            siteSettings = sitesOptions?.Value;
            hubContext = GlobalHost.ConnectionManager.GetHubContext<ChatHub>();
            _dbContext = dbContext;
            _cxManager = cxManager;
        }

        public async Task<MessageWithPayloadResponse> NotifyEvent<Event>
         (IEnumerable<string> userIds, Event ev)
           where Event : IEvent
        {

            if (ev == null)
                throw new Exception("Spécifier un évènement");

            if (ev.Sender == null)
                throw new Exception("Spécifier un expéditeur");

            if (userIds == null)
                throw new Exception("Notify e No user id");

            MessageWithPayloadResponse response = new MessageWithPayloadResponse();

            var raa = userIds.ToArray();
            if (raa.Length < 1)
                throw new Exception("No dest id");

            try
            {
                List<MessageWithPayloadResponse.Result> results = new List<MessageWithPayloadResponse.Result>();
                foreach (var userId in raa)
                {
                    MessageWithPayloadResponse.Result result = new MessageWithPayloadResponse.Result();
                    result.registration_id = userId;

                    var user = _dbContext.Users.FirstOrDefault(u => u.Id == userId);
                    if (user == null)
                    {
                        response.failure++;
                        result.error = "no such user.";
                        continue;
                    }
                    if (!user.EmailConfirmed)
                    {
                        response.failure++;
                        result.error = "user has not confirmed his email address.";
                        continue;
                    }
                    if (user.Email == null)
                    {
                        response.failure++;
                        result.error = "user has no legacy email address.";
                        continue;
                    }

                    var body = ev.CreateBody();


                    _logger.LogDebug($"Sending to {user.UserName} <{user.Email}> : {body}");
                    var mailSent = await _emailSender.SendEmailAsync(
                    user.UserName,
                    user.Email,
                        $"{ev.Sender} (un client) vous demande un rendez-vous",
                    body + Environment.NewLine
                );

                    if (!mailSent.Sent)
                    {
                        result.message_id = mailSent.MessageId;
                        result.error = mailSent.ErrorMessage;
                        response.failure++;
                    }
                    else
                    {
                        result.message_id = mailSent.MessageId;
                        response.success++;
                    }
                    var cxids = _cxManager.GetConnexionIds(user.UserName).ToArray();
                    if (cxids.Length == 0)
                    {
                        _logger.LogDebug($"no cx to {user.UserName} <{user.Email}> ");
                    }
                    else
                    {
                        _logger.LogDebug($"Sending signal to {string.Join(" ", cxids)}  : " + JsonConvert.SerializeObject(ev));

                        foreach (var cxid in cxids)
                        {
                            var hubClient = hubContext.Clients.User(cxid);
                            var data = new Dictionary<string, object>();
                            data["event"] = ev;

                            hubClient.push(ev.Topic, data);
                        }

                        result.message_id = MimeKit.Utils.MimeUtils.GenerateMessageId(
                            siteSettings.Authority
                        );

                        response.success++;
                    }
                    results.Add(result);
                }
                response.results = results.ToArray();
                return response;
            }
            catch (Exception ex)
            {
                _logger.LogError("Quelque chose s'est mal passé à l'envoi: " + ex.Message);
                throw;
            }
        }

        public async Task<MessageWithPayloadResponse> NotifyBookQueryAsync(IEnumerable<string> userIds, RdvQueryEvent ev)
        {
            return await NotifyEvent<RdvQueryEvent>(userIds, ev);
        }

        public async Task<MessageWithPayloadResponse> NotifyEstimateAsync(IEnumerable<string> userIds, EstimationEvent ev)
        {
            return await NotifyEvent<EstimationEvent>(userIds, ev);
        }

        public async Task<MessageWithPayloadResponse> NotifyHairCutQueryAsync(
         IEnumerable<string> userIds, HairCutQueryEvent ev)
        {
            return await NotifyEvent<HairCutQueryEvent>(userIds, ev);
        }

        public async Task<MessageWithPayloadResponse> NotifyAsync(IEnumerable<string> userIds, IEvent yaev)
        {
            return await NotifyEvent<IEvent>(userIds, yaev);
        }

        /* SMS with Twilio:
public Task SendSmsAsync(TwilioSettings twilioSettigns, string number, string message)
{
var Twilio = new TwilioRestClient(twilioSettigns.AccountSID, twilioSettigns.Token);
var result = Twilio.SendMessage( twilioSettigns.SMSAccountFrom, number, message);
// Status is one of Queued, Sending, Sent, Failed or null if the number is not valid
Trace.TraceInformation(result.Status);
// Twilio doesn't currently have an async API, so return success.

return Task.FromResult(result.Status != "Failed");

}  */
    }
}