const clamp = require('../util/clamp')
function inject (bot, dcclient, config) {
  const bossbarName = 'chomens_bot:tps'

  let enabled = false
  bot.tps = {
    on () {
      enabled = true
    },
    off () {
      enabled = false
      bot.core.run(`minecraft:bossbar remove ${bossbarName}`)
    }
  }

  const tickRates = []
  let nextIndex = 0
  let timeLastTimeUpdate = -1
  let timeGameJoined

  const interval = setInterval(() => {
    if (!enabled) return

    const component = {
      translate: 'TPS - %s',
      color: 'gray',
      bold: false,
      with: [
        { text: getTickRate(), color: 'green' }
      ]
    }
    bot.core.run(`minecraft:bossbar add ${bossbarName} ""`)
    bot.core.run(`minecraft:bossbar set ${bossbarName} players @a`)
    bot.core.run(`minecraft:bossbar set ${bossbarName} color yellow`)
    bot.core.run(`minecraft:bossbar set ${bossbarName} visible true`)
    bot.core.run(`minecraft:bossbar set ${bossbarName} style progress`)
    bot.core.run(`minecraft:bossbar set ${bossbarName} name ${JSON.stringify(component)}`)
    bot.core.run(`minecraft:bossbar set ${bossbarName} max 20`)
    bot.core.run(`minecraft:bossbar set ${bossbarName} value ${Math.floor(getTickRate())}`)
  }, 50)

  function getTickRate () {
    if (Date.now() - timeGameJoined < 4000) return 'Calculating...'

    let numTicks = 0
    let sumTickRates = 0.0
    for (const tickRate of tickRates) {
      if (tickRate > 0) {
        sumTickRates += tickRate
        numTicks++
      }
    }

    const value = (sumTickRates / numTicks).toFixed(2)
    if (value > 20) return 20
    else return value
  }

  bot.on('login', () => {
    nextIndex = 0
    timeGameJoined = timeLastTimeUpdate = Date.now()
  })

  bot._client.on('update_time', () => {
    const now = Date.now()
    const timeElapsed = (now - timeLastTimeUpdate) / 1000.0
    tickRates[nextIndex] = clamp(20.0 / timeElapsed, 0.0, 20.0)
    nextIndex = (nextIndex + 1) % tickRates.length
    timeLastTimeUpdate = now
  })

  bot.on('end', () => clearInterval(interval))
}

module.exports = { inject }