var fs = require('fs');
var readline = require('readline');
var google = require('googleapis');
var googleAuth = require('google-auth-library');
var atob = require('atob');
var language = require('@google-cloud/language')({
  projectId: 'fine-balm-165720',
  keyFilename: 'MyProject.json'
});
global.fetch = require('node-fetch')
var cc = require('cryptocompare')

// If modifying these scopes, delete your previously saved credentials
// at ~/.credentials/gmail-nodejs-quickstart.json
var SCOPES = ['https://mail.google.com/'];
var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
  process.env.USERPROFILE) + '/.credentials/';
var TOKEN_PATH = TOKEN_DIR + 'gmail-nodejs-quickstart.json';

// Load client secrets from a local file.
fs.readFile('client_secret.json', function processClientSecrets(err, content) {
  if (err) {
    console.log('Error loading client secret file: ' + err);
    return;
  }
  // Authorize a client with the loaded credentials, then call the
  // Gmail API.
  authorize(JSON.parse(content), listMessages);
});

/**
 * Create an OAuth2 client with the given credentials, and then execute the
 * given callback function.
 *
 * @param {Object} credentials The authorization client credentials.
 * @param {function} callback The callback to call with the authorized client.
 */
function authorize(credentials, callback) {
  var clientSecret = credentials.installed.client_secret;
  var clientId = credentials.installed.client_id;
  var redirectUrl = credentials.installed.redirect_uris[0];
  var auth = new googleAuth();
  var oauth2Client = new auth.OAuth2(clientId, clientSecret, redirectUrl);

  // Check if we have previously stored a token.
  fs.readFile(TOKEN_PATH, function (err, token) {
    if (err) {
      getNewToken(oauth2Client, callback);
    } else {
      oauth2Client.credentials = JSON.parse(token);
      callback(oauth2Client);
    }
  });
}

/**
 * Get and store new token after prompting for user authorization, and then
 * execute the given callback with the authorized OAuth2 client.
 *
 * @param {google.auth.OAuth2} oauth2Client The OAuth2 client to get token for.
 * @param {getEventsCallback} callback The callback to call with the authorized
 *     client.
 */
function getNewToken(oauth2Client, callback) {
  var authUrl = oauth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: SCOPES
  });
  console.log('Authorize this app by visiting this url: ', authUrl);
  var rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
  });
  rl.question('Enter the code from that page here: ', function (code) {
    rl.close();
    oauth2Client.getToken(code, function (err, token) {
      if (err) {
        console.log('Error while trying to retrieve access token', err);
        return;
      }
      oauth2Client.credentials = token;
      storeToken(token);
      callback(oauth2Client);
    });
  });
}

/**
 * Store token to disk be used in later program executions.
 *
 * @param {Object} token The token to store to disk.
 */
function storeToken(token) {
  try {
    fs.mkdirSync(TOKEN_DIR);
  } catch (err) {
    if (err.code != 'EEXIST') {
      throw err;
    }
  }
  fs.writeFile(TOKEN_PATH, JSON.stringify(token));
  console.log('Token stored to ' + TOKEN_PATH);
}

/**
 * Lists the messages content in the user's account.
 *
 * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
 * @param {labelIds} messages only from this label are displayed
 */
var gmail = google.gmail('v1');

function listMessages(auth) {
  gmail.users.messages.list({
    auth: auth,
    userId: 'me',
    maxResults: '500',
    q: 'newsletter@coindesk.com',
    labelIds: 'INBOX'
  }, function (err, response) {
    if (err) {
      console.log('The API returned an error: ' + err);
      return;
    }
    var messages = response.messages;
    if (undefined !== messages && messages.length == 0) {
      console.log('Messages not found.');
    } else {
      getMessageBody(messages, auth)
    }
  });
}

function getMessageBody(messages, auth) {
  if (undefined !== messages) {
    for (var i = 0; i < messages.length; i++) {
      var message = messages[i];
      gmail.users.messages.get({
          auth: auth,
          'userId': 'me',
          'id': message.id
        }, function (err, response) {
          if (err) {
            console.log('The API returned an error: ' + err);
            return;
          }
      var message = response.id
      //modifyMessage(message, auth); // Label change
      var body = response.payload.parts[0].body.data;


        var ss = language.detectSentiment(atob(body))
          .then((results) => {
                const sentiment = results[0];

            //console.log(`Text: ${atob(body)}`); // VIEW TEXT MESSAGE
            console.log('ID:' + message + `  Sentiment score: ${sentiment.score}`);
            console.log(`Sentiment magnitude: ${sentiment.magnitude}`);
            console.log('');

          })
          .catch((err) => {
          console.error('ERROR:', err);
          });

 //CURRENT PRICE
  //var price = cc.price('BTC', ['USD', 'EUR'])
  //   .then(prices => {
  //   const price = prices;
  //})


        }
      );
    }
  }
}

function modifyMessage(message, auth) {
  gmail.users.messages.modify({
      'auth': auth,
      'userId': 'me',
      'id': message,
      'resource': {
        "addLabelIds": [
          "Label_2"
        ],
        "removeLabelIds": [
          "INBOX"
        ]
      }
    }, function (err, response) {
      if (err) {
        console.log('The API returned an error: ' + err);
        return;
      }
      console.log('Success, label changed for message: ' + message)
    }
  );
}



// TODO ADD EVERYTHING TO THIS FUCKING DATABASE
function sql (){
var pg = require('pg');
var username = 'kfpyhrzizvnthq';
var password = '23fb755df500316578d72b2a62b443e2d638e1b17e60407f1838804eba1d7897';
var host = 'ec2-184-73-199-72.compute-1.amazonaws.com';
var conStringPri = 'postgres://' + username + ':' + password + '@' + host +
    ':5432/d4et7h51ifgegu';
pg.defaults.ssl = true;

          var today = new Date().toISOString().
          replace(/T/, ' ').      // replace T with a space
          replace(/\..+/, '')     // delete the dot and everything after

pg.connect(conStringPri, function(err, client, done) {
    client.query('INSERT INTO antek(ID, DATE, SCORE, PRICE) values($1, $2, $3, $4)',
    [message, today, sentiment.score , price]);

  }

);
}