// polyfills to bring Promise and fetch to our environment
require('es6-promise').polyfill();
let { fetch } = require('isomorphic-fetch');

let { HeadHunterApi, DictCurrencyConverter, RequestParam } = require('hh-stats');

// create an instance of API client
// first parameter is User-Agent to be used in requests
// second parameter is timeout in ms
const api = new HeadHunterApi('My API client', 1500);

// alternatively you could set them later via fields
api.timeout = 25000;
api.userAgent = 'My API client';

let converter;
// salaries are in different currencies so we need currency rates first
api.getCurrencies().then(cur => {
    // create instance of currency converter
    converter = new DictCurrencyConverter(cur);
    // query vacancy statistics both for 'javascript' and 'js' (keyword synonyms)
    return api.getVacancy(converter, ['javascript', 'js'], null, null);
}).then(stat => {
    console.log(`Found ${stat.amount} vacancies`);
    console.log(`${stat.used} used to calculate salary`);
    console.log(`Max salary is ${stat.maxSalary} RUR`);
    console.log(`Average salary is ${stat.avgSalary} RUR`);
    console.log(`Min salary is ${stat.minSalary} RUR`);
    
    // salary calculates in RUR (Russian Rubles) by default
    // you could easially convert it from currencies using converter
    let avgSalaryUSD = converter.convert(stat.avgSalary, 'RUR', 'USD');
    console.log(`Average salary in USD is ${avgSalaryUSD}`);
});