import TelegramBot from 'node-telegram-bot-api';
import { stateManager } from '../services/state';
import { logger, logUserAction } from '../services/logger';
import { messages } from '../messages';
import { getMainMenuKeyboard, getSettingsKeyboard } from '../utils/keyboards';
import { NotificationPreferences, DEFAULT_NOTIFICATIONS } from '../types';

/**
 * Handle /settings command (private chat only)
 */
export async function handleSettingsCommand(
  bot: TelegramBot,
  msg: TelegramBot.Message
): Promise<void> {
  const chatId = msg.chat.id;
  const userId = msg.from?.id;

  if (!userId) return;

  // Only works in private chats
  if (msg.chat.type !== 'private') {
    await bot.sendMessage(chatId, '❌ This command only works in private chat. Message me directly!');
    return;
  }

  logUserAction(userId, 'Viewed settings');

  const user = await stateManager.getUser(userId);
  if (!user) {
    await bot.sendMessage(chatId, messages.errors.startFirst, {
      reply_markup: getMainMenuKeyboard(),
    });
    return;
  }

  // Ensure notifications object exists
  const notifications = user.notifications || { ...DEFAULT_NOTIFICATIONS };
  const displayName = stateManager.getDisplayName(user);

  await bot.sendMessage(
    chatId,
    messages.settings.overview(displayName, notifications),
    {
      parse_mode: 'Markdown',
      reply_markup: getSettingsKeyboard(displayName, notifications),
    }
  );
}

/**
 * Handle settings callback
 */
export async function handleSettingsCallback(
  bot: TelegramBot,
  query: TelegramBot.CallbackQuery,
  action: string
): Promise<void> {
  const chatId = query.message?.chat.id;
  const userId = query.from.id;
  const messageId = query.message?.message_id;

  if (!chatId || !messageId) return;

  const user = await stateManager.getUser(userId);
  if (!user) {
    await bot.answerCallbackQuery(query.id, { text: 'Please /start first' });
    return;
  }

  try {
    // Handle notification toggles
    if (action.startsWith('toggle_notif_')) {
      const setting = action.replace('toggle_notif_', '') as keyof NotificationPreferences;
      const currentNotifications = user.notifications || { ...DEFAULT_NOTIFICATIONS };
      const newValue = !currentNotifications[setting];
      
      const updatedUser = await stateManager.updateNotifications(userId, { [setting]: newValue });
      
      if (updatedUser) {
        logUserAction(userId, 'Updated notification setting', { setting, newValue });
        await bot.answerCallbackQuery(query.id, {
          text: `${setting} ${newValue ? 'enabled' : 'disabled'}`,
        });

        // Update message
        const displayName = stateManager.getDisplayName(updatedUser);
        await bot.editMessageText(
          messages.settings.overview(displayName, updatedUser.notifications),
          {
            chat_id: chatId,
            message_id: messageId,
            parse_mode: 'Markdown',
            reply_markup: getSettingsKeyboard(displayName, updatedUser.notifications),
          }
        );
      }
      return;
    }

    // Handle display name change
    if (action === 'change_name') {
      await bot.answerCallbackQuery(query.id);
      await stateManager.updateUserState(userId, 'awaiting_display_name');
      await bot.sendMessage(
        chatId,
        messages.settings.enterDisplayName,
        { parse_mode: 'Markdown' }
      );
      return;
    }

    // Handle back to menu
    if (action === 'back_menu') {
      await bot.answerCallbackQuery(query.id);
      await bot.deleteMessage(chatId, messageId);
      await bot.sendMessage(chatId, messages.menu.header, {
        parse_mode: 'Markdown',
        reply_markup: getMainMenuKeyboard(),
      });
      return;
    }

    await bot.answerCallbackQuery(query.id);
  } catch (error) {
    logger.error('Error in handleSettingsCallback', { error, userId, action });
    await bot.answerCallbackQuery(query.id, { text: 'Error updating settings' });
  }
}

/**
 * Handle display name input
 */
export async function handleDisplayNameInput(
  bot: TelegramBot,
  msg: TelegramBot.Message
): Promise<void> {
  const chatId = msg.chat.id;
  const userId = msg.from?.id;
  const text = msg.text?.trim();

  if (!userId || !text) return;

  // Validate display name (max 20 chars, alphanumeric + spaces + some symbols)
  if (text.length > 20) {
    await bot.sendMessage(chatId, messages.settings.nameTooLong);
    return;
  }

  // Clean the display name (allow @ for usernames)
  const cleanName = text.replace(/[^\w\s\-_.@]/g, '').trim() || 'Anon';

  await stateManager.updateDisplayName(userId, cleanName);
  logUserAction(userId, 'Set display name', { displayName: cleanName });

  const user = await stateManager.getUser(userId);
  const notifications = user?.notifications || { ...DEFAULT_NOTIFICATIONS };

  await bot.sendMessage(
    chatId,
    messages.settings.nameUpdated(cleanName),
    {
      parse_mode: 'Markdown',
      reply_markup: getSettingsKeyboard(cleanName, notifications),
    }
  );
}

export default {
  handleSettingsCommand,
  handleSettingsCallback,
  handleDisplayNameInput,
};