'use strict'

const fs = require('fs')
const path = require('path')
const request =require('request')
const Headers = require('./headers')

// files & endpoints
const RAW_COOKIE_FILE = 'raw_jar.txt'
const JSON_COOKIE_FILE = 'cookies.json'
const TEST_ENDPOINT = 'https://layla.amazon.de/api/devices/device'

// Returns the full raw cookies path
const getRawCookiePath = data_dir => path.join(data_dir, RAW_COOKIE_FILE)
// Checks if the JSON cookie file exists
const getJsonCookiePath = data_dir => path.join(data_dir, JSON_COOKIE_FILE)
// Checks if the raw cookie file exists
const checkRawCookiesExist = data_dir => fs.existsSync(getRawCookiePath(data_dir))
// Checks if the JSON cookie file exists
const checkJsonCookiesExist = data_dir => fs.existsSync(getJsonCookiePath(data_dir))
// Checks if the raw cookie file exists
const deleteRawCookies = data_dir => fs.removeSync(getRawCookiePath(data_dir))
// Checks if the JSON cookie file exists
const deleteJsonCookies = data_dir => fs.removeSync(getJsonCookiePath(data_dir))
// Returns the cookies as a header compatible string
const transformCookiesForHeader = json_cookies => {
  let string_cookies = ''
  json_cookies.forEach(cookie => {
    Object.keys(cookie).forEach(key => {
      if (key == 'name') return
      string_cookies += key == 'value' ? cookie.name + '=' + cookie.value : key + '=' + cookie[key]
      string_cookies += ';'
    })
  })
  return string_cookies
}
// Validate the cookie 
const validateCookie = (data_dir) => {
  const json_cookies = require(path.join(data_dir, JSON_COOKIE_FILE))
  const string_cookies = transformCookiesForHeader(json_cookies)
  const headers = Headers.getFetchHeaders(string_cookies)
  return new Promise((resolve, reject) => {
    request.get({headers, url: TEST_ENDPOINT},  (error, response, body) => {
      try {
        let contents = JSON.parse(body)
        if (contents.devices) {
          resolve([true, contents])
        } else {
          reject([false, null])
        }
      } catch (e) {
        reject([false, body])
      }
    })
  })
}

module.exports = {
  getRawCookiePath,
  getJsonCookiePath,
  checkRawCookiesExist,
  checkJsonCookiesExist,
  deleteRawCookies,
  deleteJsonCookies,
  validateCookie,
  transformCookiesForHeader,
  RAW_COOKIE_FILE,
  JSON_COOKIE_FILE,
}