const fs = require('fs')
const convertMidi = require('../util/convert-midi.js')
const convertNBS = require('../util/nbs-converter.js')

function inject (bot) {
  bot.music = {
    playing: false,
    queue: [],
    nowPlaying: undefined,
    looping: false,
    _interval: null,
    _playNextSong,
    skip,
    stop,
    play
  }

  bot.music.nowPlaying = {
    name: '',
    tick: {
      current: null,
      total: null
      // npt: null
    }
  }

  setInterval(() => {
    if (!bot.music.playing) return
    const msg = [
      { text: 'Now Playing', ...bot.styles.primary },
      { text: ' | ', color: 'dark_gray' },
      { text: bot.music.nowPlaying.name, ...bot.styles.secondary, bold: true },
      { text: ' | ', color: 'dark_gray' },
      format(bot.music.nowPlaying.time),
      { text: ' / ', color: 'gray' },
      format(bot.music.nowPlaying.length)
      // { text: ' (', color: 'dark_gray' },
      // bot.music.nowPlaying.note.npt + ' npt',
      // { text: ')', color: 'dark_gray' }
    ]
    if (bot.music.looping) {
      msg.push({ text: ' | ', color: 'dark_gray' })
      msg.push({ text: 'Looping', ...bot.styles.secondary })
    }
    bot.core.run('title @a actionbar ' + JSON.stringify(msg))
  }, 500)

  function _playNextSong () {
    const song = bot.music.queue.shift()
    if (song != null) play(song)
  }

  function skip () {
    clearInterval(bot.music._interval)
    bot.music.playing = false
    if (bot.music.queue.length !== 0) _playNextSong()
  }

  function stop () {
    bot.music.queue = []
    clearInterval(bot.music._interval)
    bot.music.playing = false
  }

  function play (filepath) {
    // set stuff up
    let song
    try {
      if (filepath.endsWith('.nbs')) {
        song = convertNBS(fs.readFileSync(filepath), filepath)
      } else song = convertMidi(filepath)
      song.time = 0
      bot.music.nowPlaying = song
    } catch (err) {
      bot.tellraw({ text: err.message, ...bot.styles.error }, '@a')
      return
    }

    // play the music lol
    bot.tellraw([
      { text: 'Now playing ', ...bot.styles.primary },
      { text: song.name, ...bot.styles.secondary }
    ], '@a')
    bot.music.playing = true
    bot.music.looping = song.loop
    let startTime = (new Date()).valueOf()
    let notes = [ ...song.notes ]
    bot.music._interval = setInterval(async () => {
      const time = (new Date()).valueOf() - startTime
      song.time = time
      notes.forEach(async (note, i) => {
        if (time >= note.time) {
          const floatingpitch = Math.pow(2, (note.pitch - 12) / 12.0)
          bot.core.run(`minecraft:execute at @a run playsound block.note_block.${note.instrument} record @p ~ ~ ~ ${note.volume} ${floatingpitch}`)
          notes.splice(i, 1)
        }
      })
      song.time++

      if (time > song.length) {
        if (bot.music.looping) {
          notes = [ ...song.notes ]
          startTime = (new Date()).valueOf() + song.loopPosition
          return
        }

        clearInterval(bot.music._interval)
        bot.music.playing = false

        bot.tellraw([
          { text: 'Finished playing ', color: 'green' },
          { text: bot.music.nowPlaying.name, color: 'dark_green' }
        ], '@a')
        if (bot.music.queue.length !== 0) _playNextSong()
      }
    }, 50)
  }
}

function format (ms) {
  const s = ms / 1000

  const seconds = Math.floor(s / 60).toString()
  const minutes = Math.floor(s % 60).toString()
  return seconds + ':' + (minutes.length <= 1 ? '0' : '') + minutes
}

module.exports = inject