const fs = require(`fs`)
const _ = require(`lodash`)
const { Player } = require(`midi-player-js`)

const VOWELS = [`a`, `e`, `i`, `o`, `u`]
const CONSONANTS = [`p`, `g`, `f`, `c`, `qu`, `h`, `j`, `n`, `l`, `m`, `t`, `d`, `ch`, `r`]

const player = new Player()

player.loadFile(`./test.mid`)

const songTime = player.getSongTime()

const allEvents = player.getEvents()

const MAX_TICKS = _.last(_.maxBy(allEvents, (events) => _.last(events).tick)).tick

const parsedEvents = allEvents.map((track) => {

  return track.filter(event => event.name === `Note on`).map((event) => {

    return {
      timeSeconds: (event.tick / MAX_TICKS) * songTime,
      midiPitch: event.noteNumber,
      librettoChunk: {
        vowel: {
          name: _.sample(VOWELS),
          duration: 0.20000000298023224
        },
        suffix: [
          {
            name: _.sample(CONSONANTS),
            duration: 0.10000000149011612
          }
        ]
      }
    }
  })
}).filter(track => !_.isEmpty(track)).map((track) => {

  return {
    notes: track,
    startSuffix: [
      {
        name: _.sample(CONSONANTS),
        duration: 0.10000000149011612
      }
    ]
  }
})

const song = {
  theme: 1,
  parts: parsedEvents
}

fs.writeFile(`test.json`, JSON.stringify(song), () => console.log(`done`))