const Promise = require('bluebird')
const fs = require('fs')
const octokit = require('@octokit/rest')()

octokit.authenticate({
  type: 'basic',
  username: 'USER',
  password: 'PASS',
})

function handleGithubResponse(response, filename) {
  const data = response.data
  data.filter(
    issue => !issue.pull_request
  ).forEach(
    issue => fs.appendFileSync(`${filename}`, `${issue.title}\n`)
  )
}

async function getIssueTitles({owner, repo, filename}) {
  let response = await octokit.issues.getForRepo({
    owner, repo, per_page: 100, state: 'all'
  })
  handleGithubResponse(response, filename)
  while (octokit.hasNextPage(response)) {
    response = await octokit.getNextPage(response)
    handleGithubResponse(response, filename)
  }
}

const repos = [
  {
    owner: 'facebook',
    repo: 'react',
    filename: 'react-issues.txt',
  }, {
    owner: 'vuejs',
    repo: 'vue',
    filename: 'vue-issues.txt',
  }, {
    owner: 'angular',
    repo: 'angular',
    filename: 'angular-issues.txt',
  },
]

Promise.mapSeries(repos, getIssueTitles)