iss.js

const request = require('request');

const fetchMyIP = function(callback) {
  const url = `https://api.ipify.org?format=json`;
  request(url, (error, response, body) => {
    const ip = JSON.parse(body).ip;

    if (error) {
      return callback(error, null);
    }
    if (response.statusCode !== 200) {
      const msg = `Status Code ${response.statusCode} when fetching IP. Response: ${body}`;
      return callback(Error(msg), null);
    }
    callback(null, ip);
  });
};


const fetchCoordsByIP = function(ip, callback) {
  const url = `http://ipwho.is/${ip}`;
  request(url, (error, response, body) => {
    const coordinates = JSON.parse(body);
    if (error) {
      return callback(error, null);
    }
    if (!coordinates.success) {
      const msg = `Status Code ${coordinates.success} when fetching IP ${coordinates.ip}. Response: ${coordinates.message}`;
      return callback(Error(msg), null);
    }
    const { latitude, longitude } = coordinates;
    callback(null, { latitude, longitude });
  });
};


const fetchISSFlyOverTimes = function(coords, callback) {
  const url = `https://iss-flyover.herokuapp.com/json/?lat=${coords.latitude}&lon=${coords.longitude}`;
  request(url, (error, response, body) => {
    if (error) {
      return callback(error, null);
    }
    if (response.statusCode !== 200) {
      return callback(Error(`Status Code ${response.statusCode} when fetching ISS pass times: ${body}`), null);
    }
    const passes = JSON.parse(body).response;
    callback(null, passes);
  });
};


const nextISSTimesForMyLocation = function(callback) {
  fetchMyIP((error, ip) => {
    if (error) {
      return callback(error, null);
    }
    fetchCoordsByIP(ip, (error, coordinates) => {
      if (error) {
        return callback(error, null);
      }
      fetchISSFlyOverTimes(coordinates, (error, passTimes) => {
        if (error) {
          return callback(error, null);
        }
        callback(null, passTimes);
      });
    });
  });
};


module.exports = {
  // fetchMyIP,
  // fetchCoordsByIP,
  // fetchISSFlyOverTimes,
  nextISSTimesForMyLocation
};