using Newtonsoft.Json;
using Telegram.Bot;
using Telegram.Bot.Polling;
using Telegram.Bot.Types;
using Telegram.Bot.Types.Enums;
using Telegram.Bot.Types.ReplyMarkups;

namespace nsszcontactbot;

public class Program
{
    private static ITelegramBotClient Bot;
    private static List<Employee> Employees = new();
    private static List<string> Departments = new();
    private static int CurrentPage = 0; // Текущая страница для пагинации
    private static int PageSize = 5; // Количество подразделений на странице

    public static async Task Main(string[] args)
    {
        Bot = new TelegramBotClient("6237449447:AAEGMmpx-1hUEApFZZS_ySAMZErseKJ8dHo"); // Укажите ваш токен
        List<BotCommand> cmds = new();
        await Bot.SetMyCommandsAsync(cmds);
        LoadEmployees();
        var me = await Bot.GetMeAsync();
        Console.WriteLine($"Бот запущен: @{me.Username}");

        // Запуск обработки обновлений
        var cancellationToken = new CancellationTokenSource().Token;
        ReceiverOptions receiverOptions =
        new()
        {
            AllowedUpdates = Array.Empty<UpdateType>() // receive all update types except ChatMember related updates
        };
        Bot.StartReceiving(HandleUpdateAsync, HandleErrorAsync, receiverOptions: receiverOptions, cancellationToken: cancellationToken);

        Console.WriteLine("Нажмите Enter для выхода...");
        Console.ReadLine();
    }

    private static async Task HandleUpdateAsync(ITelegramBotClient botClient, Update update, CancellationToken cancellationToken)
    {
        if (update.Type == UpdateType.Message && update.Message?.Text != null)
        {
            var message = update.Message;

            if (message.Text.StartsWith("/start"))
            {
                await StartCommand(message);
            }
            else if (message.Text.StartsWith("/choose_department"))
            {
                await ChooseDepartment(message);
            }
            else if (message.ReplyToMessage != null && message.ReplyToMessage.Text!.StartsWith("Выберите подразделение"))
            {
                await HandleDepartmentSelection(message);
            }
            else
            {
                await HandleSearchInput(message);
            }
        }
        else if (update.Type == UpdateType.CallbackQuery)
        {
            var message = update.CallbackQuery.Message;
            string data = update.CallbackQuery.Data ?? string.Empty;
            string[] dataParts = data.Split('/');
            if (dataParts.Length > 0)
            {
                switch (dataParts[0])
                {
                    case "addcontact":
                        {
                            await HandleAddContact(update.CallbackQuery, dataParts[1]);
                            break;
                        }
                    default:
                        break;
                }
            }

        }
    }

    private static async Task StartCommand(Message message)
    {
        string text = "Привет! Я бот для поиска контактов сотрудников. Введите запрос.\n";
        //text += "/choose_department - Выбрать подразделение\n";
        await Bot.SendTextMessageAsync(message.Chat.Id, text);
    }

    private static async Task ChooseDepartment(Message message)
    {
        Departments = Employees.Select(e => e.Department).Distinct().ToList();
        CurrentPage = 0; // Сброс страницы
        await ShowDepartments(message.Chat.Id);
    }

    private static async Task ShowDepartments(long chatId)
    {
        var totalDepartments = Departments.Count;
        var totalPages = (int)Math.Ceiling((double)totalDepartments / PageSize);
        var departmentsToShow = Departments.Skip(CurrentPage * PageSize).Take(PageSize).ToList();

        string text = "Выберите подразделение:\n";
        text += string.Join("\n", departmentsToShow.Select((d, i) => $"{i + 1 + CurrentPage * PageSize}. {d}"));

        // Создание кнопок
        var inlineKeyboard = new List<List<InlineKeyboardButton>>();
        if (CurrentPage > 0)
        {
            inlineKeyboard.Add(new List<InlineKeyboardButton>
            {
                InlineKeyboardButton.WithCallbackData("◀️ Назад", "prev")
            });
        }
        if (CurrentPage < totalPages - 1)
        {
            inlineKeyboard.Add(new List<InlineKeyboardButton>
            {
                InlineKeyboardButton.WithCallbackData("Вперед ▶️", "next")
            });
        }

        var keyboardMarkup = new InlineKeyboardMarkup(inlineKeyboard);

        await Bot.SendTextMessageAsync(chatId, text, replyMarkup: keyboardMarkup);
    }

    private static async Task HandleSearchInput(Message message)
    {
        if (!string.IsNullOrEmpty(message.Text))
        {
            string query = message.Text.Trim().ToLower();
            if (query.Length < 3)
            {
                await Bot.SendTextMessageAsync(message.Chat.Id, "Минимальная длина строки поиска - 3 символа.");
                return;
            }

            // Поиск сотрудников по полям
            var results = Employees.Where(e =>
                e.FullName.ToLower().Contains(query) ||
                (e.Mail != null && e.Mail.ToLower().Contains(query)) ||
                (e.Phone != null && e.Phone.Contains(query)) ||
                (e.Mobile != null && e.Mobile.Contains(query)) ||
                (e.IP != null && e.IP.Contains(query))
            ).OrderBy(e => e.FullName.ToLower().IndexOf(query)).ToList();

            // Отправка результатов поиска
            await ShowEmployeeResults(message.Chat.Id, results);
        }
    }

    private static async Task HandleAddContact(CallbackQuery callbackQuery, string id)
    {
        if (callbackQuery.Message != null)
        {
            var employee = Employees.Where(e => e.Id == id).First();
            if (employee != null)
            {
                EmployeeContact contact = new(employee);
                string phoneNumber = !string.IsNullOrEmpty(contact.Mobile) ? contact.Mobile : contact.Phone;
                var replyParameters = new ReplyParameters() { MessageId = callbackQuery.Message.MessageId, QuoteParseMode = ParseMode.Html, Quote = $"<b>{contact.FullName}</b>" };
                await Bot.SendContactAsync(callbackQuery.Message.Chat.Id, phoneNumber, contact.FirstName, lastName: contact.LastName, vcard: contact.VCard, replyParameters: replyParameters);
                await Task.Delay(999);
            }
        }
        await Bot.AnswerCallbackQueryAsync(callbackQuery.Id);
    }

    private static async Task HandleDepartmentSelection(Message message)
    {
        if (message.Text.StartsWith("◀️ Назад"))
        {
            if (CurrentPage > 0)
            {
                CurrentPage--;
                await ShowDepartments(message.Chat.Id);
            }
        }
        else if (message.Text.StartsWith("Вперед ▶️"))
        {
            CurrentPage++;
            await ShowDepartments(message.Chat.Id);
        }
        else
        {
            int selectedIndex = int.Parse(message.Text) - 1;
            if (selectedIndex >= 0 && selectedIndex < Departments.Count)
            {
                string selectedDepartment = Departments[selectedIndex];
                var results = Employees.Where(e => e.Department == selectedDepartment).ToList();
                await ShowEmployeeResults(message.Chat.Id, results);
            }
            else
            {
                await Bot.SendTextMessageAsync(message.Chat.Id, "Некорректный выбор.");
            }
        }
    }

    private static async Task ShowEmployeeResults(long chatId, List<Employee> results)
    {
        if (results.Any())
        {
            foreach (var employee in results)
            {
                var keyboardMarkup = new InlineKeyboardMarkup()
                //.AddNewRow("1.1", "1.2", "1.3")
                .AddNewRow()
                    .AddButton("👤 Контакт", $"addcontact/{employee.Id}");
                    //.AddButton("В избранные", $"addfavorite/{employee.Id}");
                //.AddButton(InlineKeyboardButton.WithUrl("Написать письмо", $"mailto:{employee.Mail}"));

                var card = CreateEmployeeCard(employee);
                string photoPath = $"data/photos/{employee.FullName}.jpg";
                try
                {
                    await using var fileStream = new FileStream(photoPath, FileMode.Open, FileAccess.Read);
                    await Bot.SendPhotoAsync(chatId, fileStream, caption: card, parseMode: ParseMode.Html, replyMarkup: keyboardMarkup);
                }
                catch (FileNotFoundException)
                {
                    await Bot.SendTextMessageAsync(chatId, card, null, ParseMode.Html, replyMarkup: keyboardMarkup);
                }
                finally
                {
                    await Task.Delay(999);
                }
            }
        }
        else
        {
            await Bot.SendTextMessageAsync(chatId, "Сотрудники не найдены.");
        }
    }

    static string GetEventStatus(Employee employee)
    {
        if (employee.StartDate == null || employee.EndDate == null)
        {
            return string.Empty;
        }
        DateTime today = DateTime.Now;
        TimeSpan oneWeekBeforeEvent = (DateTime)employee.StartDate - today;

        if (employee.StartDate <= today && today <= employee.EndDate)
        {
            // Сотрудник участвует в событии
            return $"🟥 {employee.State} с {employee.StartDate:dd.MM.yyyy} по {employee.EndDate:dd.MM.yyyy}";
        }
        else if (oneWeekBeforeEvent.TotalDays <= 7 && oneWeekBeforeEvent.TotalDays > 0)
        {
            // Событие начнется через неделю
            return $"🟩 {employee.State} с {employee.StartDate:dd.MM.yyyy} по {employee.EndDate:dd.MM.yyyy}";
        }

        // Если событие не указано или неактуально
        return string.Empty;
    }

    private static string CreateEmployeeCard(Employee employee)
    {
        EmployeeContact contact = new(employee);
        string card = $"👤 <b>{contact.FullName}</b>\n" +
                      $"🏢 {contact.Department}\n" +
                      $"🎓 {contact.Position}\n";

        if (!string.IsNullOrEmpty(contact.Mail))
            card += $"✉️ {contact.Mail}\n";

        if (!string.IsNullOrEmpty(contact.Mobile))
            card += $"📱 {contact.Mobile}\n";
        if (!string.IsNullOrEmpty(contact.ExtensionNumber))
            card += $"📞 {contact.ExtensionNumber}\n";

        //if (!string.IsNullOrEmpty(employee.IP))
        //    card += $"🌐 {employee.IP}\n";

        card += GetEventStatus(employee);

        return card;
    }

    private static string CreateEmployeeCard2(Employee employee)
    {
        string photoUrl = $"https://contacts.int.nssz.ru/data/photos/{employee.FullName.Replace(" ", "%20")}.jpg"; // Формирование пути к фотографии

        string card = $"👤 <b>{employee.FullName}</b>\n" +
                      $"🏢 Отдел: {employee.Department}\n" +
                      $"🎓 Должность: {employee.Position}\n" +
                      $"📸 Фото: <a href='{photoUrl}'>Посмотреть фото</a>\n"; // Добавление ссылки на фото

        if (!string.IsNullOrEmpty(employee.Mail))
            card += $"✉️ Почта: {employee.Mail}\n";
        if (!string.IsNullOrEmpty(employee.Phone))
            card += $"📞 Телефон: {employee.Phone}\n";
        if (!string.IsNullOrEmpty(employee.Mobile))
            card += $"📱 Мобильный: +{employee.Mobile}\n";
        if (!string.IsNullOrEmpty(employee.IP))
            card += $"🌐 IP: {employee.IP}\n";

        card += GetEventStatus(employee);

        return card;
    }

    private static void LoadEmployees()
    {
        // Загрузка данных сотрудников из JSON файла
        var json = System.IO.File.ReadAllText("data/contacts.json");
        Employees = JsonConvert.DeserializeObject<List<Employee>>(json)!;
    }

    private static Task HandleErrorAsync(ITelegramBotClient botClient, Exception exception, CancellationToken cancellationToken)
    {
        Console.WriteLine($"Произошла ошибка: {exception.Message}");
        return Task.CompletedTask;
    }
}