const express = require('express')
const bodyParser = require("body-parser");
var fs = require('fs');
var readline = require('readline');
var google = require('googleapis');
var googleAuth = require('google-auth-library');

require('dotenv').config()

const PEOPLE_DB = process.env.PEOPLE_DB;
const PAIRS_LIST = process.env.PAIRS_LIST;

const app = express()
const router = express.Router();


router.use(bodyParser.urlencoded({ extended: false }));
router.use(bodyParser.json());

/*
app.get('/', function (req, res) {
  res.send('Hello World!')
})
*/

var SCOPES = ['https://www.googleapis.com/auth/spreadsheets.readonly'];
var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
    process.env.USERPROFILE) + '/.credentials/';
var TOKEN_PATH = TOKEN_DIR + 'sheets.googleapis.com-nodejs-quickstart.json';

fs.readFile('client_secret.json', function processClientSecrets(err, content) {
  console.log("reading client secret");
  if (err) {
    console.log('Error loading client secret file: ' + err);
    return;
  }
  // Authorize a client with the loaded credentials, then call the
  // Google Sheets API.
  authorize(JSON.parse(content), listPairs);
});

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) {
    console.log(TOKEN_PATH);
    if (err) {
      getNewToken(oauth2Client, callback);
    } else {
      oauth2Client.credentials = JSON.parse(token);
      callback(oauth2Client);
    }
  });
}

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);
    });
  });
}

function storeToken(token) {
  try {
    fs.mkdirSync(TOKEN_DIR);
  } catch (err) {
    if (err.code != 'EEXIST') {
      throw err;
    }
  }
  console.log(JSON.stringify(token));
  fs.writeFile(TOKEN_PATH, JSON.stringify(token));
  console.log('Token stored to ' + TOKEN_PATH);
}

function listPairs(auth){
  ranges = ['2017!A:A','2017!B:B'];
  var sheets = google.sheets('v4');
  sheets.spreadsheets.values.batchGet({
    auth: auth,
    spreadsheetId: '1gPuRhTry3YoJ_ibI2BfL1ue2_YLlhtW56OP39ADJY_4',
    ranges: ranges
  }, function(err, result) {
   if(err) {
     // Handle error
     console.log(err);
   } else {
     console.log('%d ranges retrieved.', result.valueRanges.length);
     console.log(result.valueRanges[0].values[0]);
   }
  });
}
/*
function listPairs(auth) {
  var sheets = google.sheets('v4');
  sheets.spreadsheets.values.get({
    auth: auth,
    spreadsheetId: '1gPuRhTry3YoJ_ibI2BfL1ue2_YLlhtW56OP39ADJY_4',
    range: '2017!A:A',
  }, function(err, response) {
    if (err) {
      console.log('The API returned an error: ' + err);
      return;
    }
    var rows = response.values;
    if (rows.length == 0) {
      console.log('No data found.');
    } else {
      console.log('Name, Major:');
      for (var i = 0; i < rows.length; i++) {
        var row = rows[i];
        // Print columns A and E, which correspond to indices 0 and 4.
        console.log('%s, %s', row[0], row[4]);
      }
    }
  });
}*/

router.post('/getPairs',(req,resp)=>{
  //resp.send({ime:'Bilal',prezime:'Catic'});
  // Load client secrets from a local file.

});

app.listen(3005, function () {
  console.log('server na portu 3005');
})