using Microsoft.Office.Interop.Outlook;
using System;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using Telegram.Bot;

namespace OutlookTelegramNotifier
{
    [ComVisible(true)]
    public class OutlookTelegramNotifier
    {
        private Application outlookApp;
        private TelegramBotClient botClient;
        private const string TELEGRAM_BOT_TOKEN = "YOUR_BOT_TOKEN";
        private const string TELEGRAM_CHANNEL_ID = "YOUR_CHANNEL_ID";
        private Timer checkTimer;

        public OutlookTelegramNotifier()
        {
            outlookApp = Globals.ThisAddIn.Application;
            botClient = new TelegramBotClient(TELEGRAM_BOT_TOKEN);
            
            // Запускаем таймер для проверки событий каждую минуту
            checkTimer = new Timer(CheckUpcomingMeetings, null, 0, 60000);
        }

        private async void CheckUpcomingMeetings(object state)
        {
            try
            {
                var calendar = outlookApp.Session.GetDefaultFolder(OlDefaultFolders.olFolderCalendar);
                var items = calendar.Items;
                items.Sort("[Start]");
                
                var now = DateTime.Now;
                var fifteenMinutesFromNow = now.AddMinutes(15);

                foreach (AppointmentItem appointment in items)
                {
                    if (appointment.Start > now && appointment.Start <= fifteenMinutesFromNow)
                    {
                        // Проверяем, не отправляли ли мы уже уведомление для этой встречи
                        if (!appointment.UserProperties["NotificationSent"]?.Value)
                        {
                            await SendTelegramNotification(appointment);
                            
                            // Отмечаем, что уведомление отправлено
                            var prop = appointment.UserProperties.Add("NotificationSent", OlUserPropertyType.olYesNo);
                            prop.Value = true;
                            appointment.Save();
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                // Обработка ошибок
                System.Diagnostics.Debug.WriteLine($"Error: {ex.Message}");
            }
        }

        private async Task SendTelegramNotification(AppointmentItem appointment)
        {
            var message = $"🔔 Напоминание о встрече\n\n" +
                         $"📅 {appointment.Subject}\n" +
                         $"⏰ Начало: {appointment.Start:HH:mm}\n" +
                         $"📍 {appointment.Location}\n\n" +
                         $"Описание: {appointment.Body.Substring(0, Math.Min(appointment.Body.Length, 100))}...";

            await botClient.SendTextMessageAsync(
                chatId: TELEGRAM_CHANNEL_ID,
                text: message
            );
        }
    }
}