const express = require('express'), http = require('http');
const router = express.Router();
let btcCache = {};

/* GET users listing. */
router.get('/', function(req, res, next) {
  console.log('Bitcoin request');
  function btcQuery(callback, r) {
    const req = r;
    const options = {
      'host': 'api.coindesk.com', //  port: 80,
      'path': '/v1/bpi/currentprice.json', // method: 'GET',
      'headers': {

        /*   'Content-Type': 'application/json',
                       'Content-Length': Buffer.byteLength(data)*/

      }
    };

    http.request(options).on('response', function (response) {
      let data = '';
      response.on('data', function (chunk) {
        data += chunk;
      });
      response.on('end', function () {
        callback(JSON.parse(data), r);
      });
    }).end();
  }

  const now = new Date();
  if (now - GLOBAL.lastcheck.btc > (59000 ))
    btcQuery(function (a, b) {
      console.log(a);
      btcCache = a;
      GLOBAL.lastcheck.btc = now;
      res.writeHead(200, { 'ContentType': 'application/json' });
      // res.setHeader('Content-Type', 'application/json');
      res.end(JSON.stringify(btcCache));
    }, res);

  else {
    console.log('Using cache');
    // res.setHeader('Content-Type', 'application/json');
    res.writeHead(200, { 'ContentType': 'application/json' });
    res.end(JSON.stringify(btcCache));
  }
});

module.exports = router;