const fs = require('fs')
const jsdom = require('jsdom')
const axios = require('axios')

const fetchBrands = () => new Promise(async (resolve, reject) => {
  try {
    const res = await axios({
      method: 'GET',
      url: process.env.SIMPLEICONS_URL,
      responseType: 'buffer',
    })

    const response = res.data.toString('utf-8')
    const dom = new jsdom.JSDOM(response)
    const { window, } = dom
    const linkElements = Array.from(window.document.getElementsByClassName('grid-item__link'))
    const links = linkElements
      .map(el => el.parentElement)
      .map(el => {
        const titleEl = el.getElementsByClassName('grid-item__title')[0]
        const subtitleEl = el.getElementsByClassName('grid-item__subtitle')[0]

        return {
          name: titleEl.textContent,
          color: subtitleEl.textContent,
        }
      })
      .sort((a, b) => a.name.localeCompare(b.name))
    const outputStream = fs.createWriteStream(process.env.BRANDS_JSON_FILE_PATH)
    outputStream.on('finish', () => {
      resolve(links)
    })
    outputStream.write(JSON.stringify(links))
  } catch (err) {
    reject(err)
  }
})

module.exports = () => new Promise((resolve, reject) => {
  fs.readFile(process.env.BRANDS_JSON_FILE_PATH, async (err, file) => {
    if (err && err.code === 'ENOENT') {
      const result = await fetchBrands()
      resolve(result)
      return
    }
    if (err) {
      reject(err)
      return
    }
    resolve(JSON.parse(file.toString('utf-8')))
  })
})