// Assign Ubidots' Token
var ubidots_token = "assign_your_ubidots_token_here";

// Import the 'request-promise' library so we can make HTTP request from the function
var request = require('request-promise');

// Main function - runs every time the function is executed.
async function main() {

  // Define const variables
  var username = "assign_mobilelogix_username"; // Assign username's account where the device is registered
  var password = "assign_mobilelogix_password"; // Assign password's account where the device is registered
  var serial_number = "assign_BAT_serial_numer"; // Assign device serial number

  // Access Mobilogix to get the Authentication Token
  var token_response = await auth_login(username, password);
  var token = JSON.parse(token_response);

  // Save the Token returned
  var mobi_token = token["auth_token"];

  // Make request to Mobilogix to get GPS, and enviromental sensors data
  var gps = await mobilogix_request("LocateDevice", serial_number, mobi_token);
  var sensors = await mobilogix_request("GetDeviceDetails", serial_number, mobi_token);  

  // Verify GPS status to set 1 as fixed value for "location" variable
  var isTripActive = 0;
  if( gps['isTripActive'] == true ){
    isTripActive = 1;
  }

  // Build Ubidots payload with battery, temperature, humidity, pressure and location data
  var payload = { 
    "battery-status": sensors['deviceDetails']['value'][0]['batteryStatus'],
    "temperature": sensors['deviceDetails']['value'][0]['temperatureValue'],
    "humidity": sensors['deviceDetails']['value'][0]['humidityValue'],
    "pressure": sensors['deviceDetails']['value'][0]['pressureValue'],
    "location": {
      "value": isTripActive, 
      "context": {
        "lat": gps['latitude'],
        "lng": gps['longitude']
      }
    }
  };

  // Send the payload to Ubidots
  var response = await ubidots_request(ubidots_token, serial_number, payload);

  // Pass Ubidots' API response as the function's reponse
  return response;
}

// Builds an HTTP POST request to Mobilogix to login the account, and get auth token
async function auth_login(username, password) {
  var options = {
    url: 'https://fusion.mobilogix.com:6443/api/Auth/login',
    json: true,
    headers: {
      'Accept': 'application/json',
      'x-api-version':'1.0'
    },
    body: {
      'username': username,
      'password': password 
    }
  };

  return await request.post(options);
}

// Builds an HTTP GET request to Mobilogix
// Endpoints - GPS: "LocateDevice", Enviromental Sensors: "GetDeviceDetails"
async function mobilogix_request(endpoint, serial_number, mobi_token) {
  var options = {
    url: ${"https://fusion.mobilogix.com:9443/api/DeviceIOTSettings/"}${endpoint}${"/"}${serial_number},
    json: true,
    headers: {
      'Accept': 'application/json',
      'x-api-version':'1.0',
      'Authorization': 'Bearer ' + mobi_token
    }
  };
  return await request.get(options);
}

// This function builds an HTTP POST request to Ubidots
async function ubidots_request(token, label, body) {
  var options = {
    method: 'POST',
    url: ${"https://industrial.api.ubidots.com/api/v1.6/devices/"}${label},
    body: body,
    json: true,
    headers: {
      'Content-Type': 'application/json',
      'X-Auth-Token': token
    }
  };
  return await request.post(options);
}