const axios = require('axios')
const fs = require('fs')
const { spawnSync } = require('child_process')
const runCommand = (command, args) =>
  spawnSync(command, args)
    .stdout.toString()
    .replace(/\n/g, '')

const FAIL_ON_ERROR = false
const PW_BUILD_DATA_DIR = './.postwoman'
const IS_DEV_MODE = process.argv.includes('--dev')

try {
  ;(async () => {
    // Create the build data directory if it does not exist.
    if (!fs.existsSync(PW_BUILD_DATA_DIR)) {
      fs.mkdirSync(PW_BUILD_DATA_DIR)
    }

    let version = {}
    // Get the current version name as the tag from Git.
    version.name =
      process.env.TRAVIS_TAG || runCommand('git', ['tag --sort=committerdate | tail -1'])

    // FALLBACK: If version.name was unset, let's grab it from GitHub.
    if (!version.name) {
      version.name = (
        await axios
          .get('https://api.github.com/repos/liyasthomas/postwoman/releases')
          // If we can't get it from GitHub, we'll resort to getting it from package.json
          .catch(ex => ({
            data: [
              {
                tag_name: require('./package.json').version,
              },
            ],
          }))
      ).data[0]['tag_name']
    }

    // Get the current version hash as the short hash from Git.
    version.hash = runCommand('git', ['rev-parse', '--short', 'HEAD'])
    // Get the 'variant' name as the branch, if it's not master.
    version.variant =
      process.env.TRAVIS_BRANCH ||
      runCommand('git', ['branch'])
        .split('* ')[1]
        .split(' ')[0] + (IS_DEV_MODE ? ' - DEV MODE' : '')
    if (['', 'master'].includes(version.variant)) {
      delete version.variant
    }

    // Write version data into a file
    fs.writeFileSync(`${PW_BUILD_DATA_DIR}/version.json`, JSON.stringify(version))
  })()
} catch (ex) {
  console.error(ex)
  process.exit(FAIL_ON_ERROR ? 1 : 0)
}