import fetch from 'isomorphic-fetch'

const defaultHeaders = {
  Accept: 'application/json',
  'Content-Type': 'application/json',
}

/**
  * @return {Object} headers with token
  */
function buildHeaders() {
  //const authToken = localStorage.getItem('we.token')
  //return { ...defaultHeaders, Authorization: authToken }
  return defaultHeaders
}

/**
  * @param {Object} response - standart isomorphic-fetch response object
  * @return {Object} success isomorphic-fetch response
  */
export function checkStatus(response) {
  let json = response.json() // http://stackoverflow.com/a/29475662/1916578

  if (response.status >= 200 && response.status < 300) {
    return json
  } else {
    return json.then(window.Promise.reject.bind(window.Promise))
  }
}

/**
  * @param {String} url - api request url
  * @return {Object} fetch response (promise)
  */
export function httpGet(url) {
  return fetch(url, {
    headers: buildHeaders(),
  })
  .then(checkStatus)
}

/**
  * @param {String} url - api request url
  * @return {Object} fetch response (promise)
  */
export function httpPost(url, data) {
  const body = JSON.stringify(data)

  return fetch(url, {
    method: 'post',
    headers: buildHeaders(),
    body: body,
  })
  .then(checkStatus)
}

/**
  * @param {String} url - api request url
  * @return {Object} fetch response (promise)
  */
export function httpDelete(url) {

  return fetch(url, {
    method: 'delete',
    headers: buildHeaders(),
  })
  .then(checkStatus)
}