const TRANSPOSITION = 1

const NOTES_DOWN = 0

const {Midi} = require('@tonejs/midi')

const fs = require('fs')

const owo = new Midi(fs.readFileSync(process.argv.length > 2 ? process.argv[2] : 'input.mid'))

const base = {}

//owo.tracks = [owo.tracks[20],owo.tracks[22], owo.tracks[28]]

for(const ti in owo.tracks) {

const track = owo.tracks[ti]

const trackconv = []

const noteticks = [...new Set(track.notes.map(m=>m.time))]

for(const notetime of noteticks) {

const timenoteson = []

for(const note of track.notes){

if(note.time == notetime) {

timenoteson.push(note.midi - (TRANSPOSITION * 12) - NOTES_DOWN)

}

}

trackconv.push([Math.floor(notetime*100000000)/100000000,timenoteson])

}

const noteticks2 = [...new Set(track.notes.map(m=>m.time+m.duration))]

const trackconv2 = []

for(const notetime of noteticks2) {

const timenotesoff = []

for(const note of track.notes) {

if(note.time+note.duration == notetime) {

timenotesoff.push(note.midi - (TRANSPOSITION * 12) - NOTES_DOWN)

}

}

trackconv2.push([Math.floor(notetime*100000000)/100000000,timenotesoff])

}

base['track'+ti] = [trackconv,trackconv2]

}

fs.writeFileSync('input.seq',JSON.stringify(base))

console.log('done')