const TelegramBot = require('node-telegram-bot-api');

const config = require('./config');

// Be sure to replace YOUR_BOT_TOKEN with your actual bot token on this line.
let telegram = new TelegramBot(config.botId, {
  polling: true
});
let admin_chatId = config.admin.id;
const SLIDESHOW_LOCATION = config.slideShowFolderPath; // Ends with '/'
telegram.on('message', (msg) => {
  const chatId = msg.chat.id;
  if (userAllowd(msg)) {
    handleMessage(msg);
  } else {
    telegram.sendMessage(chatId, 'Sorry ' + msg.from.username + ' My master says I can\'t talk to strangers...');
    console.log('Unauthorized user: ', msg.from.username, 'Message:');
    console.log(JSON.stringify(msg, null, 2));
    notifyAdmin('Unauthorized user: ' + msg.from.username + ' Message:\n' + JSON.stringify(msg, null, 2));
  }

});

// Location Of HardDrive - /media/64C6A9C4724C63E5/slideshow
function storeFile(fileId, callback) {
  telegram.downloadFile(fileId, SLIDESHOW_LOCATION)
    .then((filePath) => {
      callback(null, "YAYYY!!! file saved at: " + filePath);
    })
    .catch((err) => {
      callback(err);
    });
}

let storeFileCallback = (err, message, chatId, photo_id) => {
  if (err) {
    telegram.sendMessage(chatId, 'Failed to store your photo! - ' + err);
    if (admin_chatId !== chatId) notifyAdmin('Hi Master!!,\nA Failed attemt to save a file to slideshow', photo_id);
  } else {
    telegram.sendMessage(chatId, message);
    if (admin_chatId !== chatId) notifyAdmin('Hi Master!!,\nA photo was saved to your slideshow', photo_id);
  }
};

let handleMessage = (msg) => {
  const chatId = msg.chat.id;
  if (msg.photo || (msg.document && msg.document.mime_type.indexOf('image/') === 0)) {
    if (msg.photo) {
      storeFile(msg.photo[msg.photo.length - 1].file_id, (err, message) => {
        storeFileCallback(err, message, chatId, msg.photo[msg.photo.length - 1].file_id);
      });
    } else { // document - uncompressed photo
      storeFile(msg.document.file_id, (err, message) => {
        storeFileCallback(err, message, chatId, msg.document.file_id);
      });
    }
  } else if(msg.contact) {
    notifyAdmin('User with ID of: ' + msg.contact.user_id + ' Should be added/removed!');
  }
  else {
    // send a message to the chat acknowledging receipt of their message
    telegram.sendMessage(chatId, 'Hey dude... I can only help you save photos to your home slideshow.... other functions later :)');
  }
};

let userAllowd = (msg)=>{
  if(msg.from.username === config.admin.username) {
    admin_chatId = msg.chat.id;
    return true;
  }
  if(config.permissions.allowAll) return true;
  if(config.permissions.usernames.indexOf(msg.from.username) >= 0) return true;
  if(config.permissions.userIds.indexOf(msg.from.id) >= 0) return true;
  return false;
};

let notifyAdmin = (msg, photo_id) => {
  console.log(admin_chatId);
  if (admin_chatId != null && config.admin.notifyActivity){
    telegram.sendMessage(admin_chatId, msg);
    if(photo_id) telegram.sendPhoto(admin_chatId, photo_id);
  }
};