const ffmpeg = require('fluent-ffmpeg')
const tmp = require('tmp')
const fs = require('fs')
const path = require('path')
const canvas = require('canvas')
const colorsys = require('colorsys')
const { randomUUID } = require('crypto')
const nbt = require('prismarine-nbt')
const SNBT = require('../util/snbt.js')
const toNBTUUID = require('./../util/uuid-to-nbt-uuid.js')

const cnv = canvas.createCanvas(256, 144)
const ctx = cnv.getContext('2d')

function inject (bot) {
  const video = {
    nowPlaying: null,
    _interval: null,
    _tmpobj: null,
    play,
    stop,
    summon
  }
  bot.video = video

  async function play (input, uuids) {
    uuids ??= await summon(cnv.height)
    video._tmpobj = tmp.dirSync()
    bot.core.run('minecraft:tellraw @a ' + JSON.stringify('Extracting frames from the video...'))
    ffmpeg(input)
      .output(path.join(video._tmpobj.name, '%01d.bmp'))
      .fps(30)
      .size(cnv.width + 'x' + cnv.height)
      .on('error', (err) => bot.core.run('minecraft:tellraw @a ' + JSON.stringify({ text: require('util').inspect(err).replace(/\n.*/g, ''), color: 'red' })))
      .on('end', playVideo)
      .run()

    function playVideo () {
      bot.core.run('minecraft:tellraw @a ' + JSON.stringify('Now playing the video'))

      const frames = []
      fs.readdirSync(video._tmpobj.name).forEach((filename) => {
        const filepath = path.join(video._tmpobj.name, filename)
        let num = filename
        // while (num.length !== 0 && !/\d/.test(num[0])) {
        //  num = num.slice(1)
        // }
        num = parseInt(num)
        frames[num] = filepath
      })

      let i = 0
      video._interval = setInterval(async () => {
        const img = await canvas.loadImage(frames[i++]).catch(({ message }) => bot.core.run('minecraft:tellraw @a ' + JSON.stringify({ text: message, color: 'red' })))
        if (!(img ?? false)) return
        fs.unlink(frames[i - 1], () => {})
        ctx.drawImage(img, 0, 0, cnv.width, cnv.height)
        const rgba = ctx.getImageData(0, 0, cnv.width, cnv.height).data
        let line = []
        let k = 0
        for (let j = 0; j < rgba.length; j += 4) {
          const r = rgba[j]
          const g = rgba[j + 1]
          const b = rgba[j + 2]
          const hex = colorsys.rgbToHex(r, g, b)
          if (line.length >= 1 && line[line.length - 1].color === hex) line[line.length - 1].text += '╷'
          else line.push({ text: '╷', color: hex })
          if (((j / 4) % cnv.width) === 0) {
            bot.core.run(`minecraft:data modify entity ${uuids[k++]} CustomName set value ${SNBT.stringify(nbt.string(JSON.stringify(line)))}`)
            line = []
          }
        }
        if (i >= frames.length) stop()
      }, 33.33333)
    }
  }
  function stop () {
    clearInterval(video._interval)
    video._tmpobj?.removeCallback()
  }
  function summon (amount) {
    return new Promise((resolve) => {
      const uuids = []
      bot.core.run('minecraft:tellraw @a ' + JSON.stringify({ text: 'Summoning armor stands...' }))
      video._interval = setInterval(() => {
        const uuid = randomUUID()
        bot.exploits.execute(`at _ChipMC_ run summon armor_stand ~ ~${uuids.length * -0.1} ~ ${SNBT.stringify(nbt.comp({ UUID: toNBTUUID(uuid), CustomNameVisible: nbt.byte(1), Invisible: nbt.byte(1), Marker: nbt.byte(1) }))}`)
        uuids.push(uuid)
        if (uuids.length >= amount) {
          clearInterval(video._interval)
          resolve(uuids)
        }
      }, 100)
    })
  }
}

module.exports.bot = inject