'use strict'

const fs = require('fs')
const human = require('human-time')

const interval = 5007
const file = process.argv[2]
let exists = false

if (!file) {
  console.error('supply a file')
  process.exit(1)
}

const created = ({birthtime}) => 
  !exists && (Date.now() - birthtime) < interval

const missing = ({birthtime, mtime, atime, ctime}) => 
  !(birthtime|mtime|atime|ctime)

const updated = (cur, prv) => cur.mtime !== prv.mtime

fs.watchFile(file, {interval}, (cur, prv) => {
  if (missing(cur)) {
    const msg = exists ? 'removed' : 'doesn\'t exist'
    exists = false
    return console.log(`${file} ${msg}`)
  }

  if (created(cur)) {
    exists = true
    return console.log(`${file} created ${human((cur.birthtime))}`)
  }

  exists = true

  if (updated(cur, prv)) {
    return console.log(`${file} updated ${human((cur.mtime))}`)
  }

  console.log(`${file} modified ${human((cur.mtime))}`)
})