const dargs = require('dargs')
const execa = require('execa')

const commitDelimiter = '--------->commit---------'

const hashDelimiter = '--------->hash---------'

const format = `%H${hashDelimiter}%B%n${commitDelimiter}`

const buildGitArgs = gitOpts => {
  const { from, to, ...otherOpts } = gitOpts
  var formatArg = `--format=${format}`
  var fromToArg = [from, to].filter(Boolean).join('..')

  var gitArgs = ['log', formatArg, fromToArg]

  return gitArgs.concat(
    dargs(gitOpts, {
      includes: Object.keys(otherOpts),
    }),
  )
}

const gitCommits = async gitOpts => {
  var args = buildGitArgs(gitOpts)

  var { stdout } = await execa('git', args, {
    cwd: process.cwd(),
  })

  const commits = stdout.split(`${commitDelimiter}\n`).map(messageItem => {
    const [hash, message] = messageItem.split(hashDelimiter)

    return {
      hash,
      message,
    }
  })

  return commits
}

module.exports = gitCommits