/* eslint-env jest */

const squid = require('flying-squid')
const settings = require('../config/default-settings')
const mineflayer = require('mineflayer')
const { Vec3 } = require('vec3')
const Item = require('prismarine-item')('1.8')

function assertPosEqual (actual, expected) {
  expect(actual.distanceTo(expected)).toBeLessThan(1)
}

const once = require('event-promise')

describe('server with mineflayer connection', () => {
  jest.setTimeout(60 * 1000)
  let bot
  let bot2
  let serv

  async function onGround (bot) {
    await new Promise((resolve) => {
      const l = () => {
        if (bot.entity.onGround) {
          bot.removeListener('move', l)
          resolve()
        }
      }
      bot.on('move', l)
    })
  }

  async function waitMessage (bot, message) {
    const msg1 = await once(bot, 'message')
    expect(msg1.extra[0].text).toEqual(message)
  }

  async function waitMessages (bot, messages) {
    const toReceive = messages.reduce((acc, message) => {
      acc[message] = 1
      return acc
    }, {})
    const received = {}
    return new Promise(resolve => {
      const listener = msg => {
        const message = msg.extra[0].text
        if (!toReceive[message]) throw new Error('Received ' + message + ' , expected to receive one of ' + messages)
        if (received[message]) throw new Error('Received ' + message + ' two times')
        received[message] = 1
        if (Object.keys(received).length === messages.length) {
          bot.removeListener('message', listener)
          resolve()
        }
      }
      bot.on('message', listener)
    })
  }

  async function waitLoginMessage (bot) {
    return Promise.all([waitMessages(bot, ['bot joined the game.', 'bot2 joined the game.'])])
  }

  beforeEach(async () => {
    const options = settings
    options['online-mode'] = false
    options['port'] = 25566
    options['view-distance'] = 2
    options['worldFolder'] = undefined
    options['logging'] = false

    serv = squid.createMCServer(options)

    await once(serv, 'listening')
    bot = mineflayer.createBot({
      host: 'localhost',
      port: 25566,
      username: 'bot',
      version: '1.8'
    })
    bot2 = mineflayer.createBot({
      host: 'localhost',
      port: 25566,
      username: 'bot2',
      version: '1.8'
    })

    await Promise.all([once(bot, 'login'), once(bot2, 'login')])
    bot.entity.onGround = false
    bot2.entity.onGround = false
  })

  afterEach(async () => {
    await serv.quit()
  })

  describe('actions', () => {
    function waitSpawnZone (bot, view) {
      const nbChunksExpected = (view * 2) * (view * 2)
      let c = 0
      return new Promise(resolve => {
        const listener = () => {
          c++
          if (c === nbChunksExpected) {
            bot.removeListener('chunkColumnLoad', listener)
            resolve()
          }
        }
        bot.on('chunkColumnLoad', listener)
      })
    }

    test('can dig', async () => {
      await Promise.all([waitSpawnZone(bot, 2), waitSpawnZone(bot2, 2), onGround(bot), onGround(bot2)])

      const pos = bot.entity.position.offset(0, -1, 0).floored()
      bot.dig(bot.blockAt(pos))

      let [, newBlock] = await once(bot2, 'blockUpdate', {array: true})
      assertPosEqual(newBlock.position, pos)
      expect(newBlock.type).toEqual(0)
    })

    test('can place a block', async () => {
      await Promise.all([waitSpawnZone(bot, 2), waitSpawnZone(bot2, 2), onGround(bot), onGround(bot2)])

      const pos = bot.entity.position.offset(0, -2, 0).floored()
      bot.dig(bot.blockAt(pos))

      let [, newBlock] = await once(bot2, 'blockUpdate', {array: true})
      assertPosEqual(newBlock.position, pos)
      expect(newBlock.type).toEqual(0)

      bot.creative.setInventorySlot(36, new Item(1, 1))
      await new Promise((resolve) => {
        bot.inventory.on('windowUpdate', (slot, oldItem, newItem) => {
          if (slot === 36 && newItem && newItem.type === 1) { resolve() }
        })
      })

      bot.placeBlock(bot.blockAt(pos.offset(0, -1, 0)), new Vec3(0, 1, 0));

      [, newBlock] = await once(bot2, 'blockUpdate', {array: true})
      assertPosEqual(newBlock.position, pos)
      expect(newBlock.type).toEqual(1)
    })
  })

  describe('commands', () => {
    jest.setTimeout(10 * 1000)
    test('has an help command', async () => {
      await waitLoginMessage(bot)
      bot.chat('/help')
      await once(bot, 'message')
    })
    test('can use /particle', async () => {
      bot.chat('/particle 5 10 100 100 100')
      await once(bot._client, 'world_particles')
    })
    test('can use /playsound', async () => {
      bot.chat('/playsound ambient.weather.rain')
      await once(bot, 'soundEffectHeard')
    })

    function waitDragon () {
      return new Promise((resolve) => {
        const listener = (entity) => {
          if (entity.name === 'EnderDragon') {
            bot.removeListener('entitySpawn', listener)
            resolve()
          }
        }
        bot.on('entitySpawn', listener)
      })
    }

    test('can use /summon', async () => {
      bot.chat('/summon EnderDragon')
      await waitDragon()
    })
    test('can use /kill', async () => {
      bot.chat('/summon EnderDragon')
      await waitDragon()
      bot.chat('/kill @e[type=EnderDragon]')
      const entity = await once(bot, 'entityDead')
      expect(entity.name).toEqual('EnderDragon')
    })
    describe('can use /tp', () => {
      test('can tp myself', async () => {
        bot.chat('/tp 2 3 4')
        await once(bot, 'forcedMove')
        assertPosEqual(bot.entity.position, new Vec3(2, 3, 4))
      })
      test('can tp somebody else', async () => {
        bot.chat('/tp bot2 2 3 4')
        await once(bot2, 'forcedMove')
        assertPosEqual(bot2.entity.position, new Vec3(2, 3, 4))
      })
      test('can tp to somebody else', async () => {
        await onGround(bot)
        bot.chat('/tp bot2 bot')
        await once(bot2, 'forcedMove')
        assertPosEqual(bot2.entity.position, bot.entity.position)
      })
      test('can tp with relative positions', async () => {
        await onGround(bot)
        const initialPosition = bot.entity.position.clone()
        bot.chat('/tp ~1 ~-2 ~3')
        await once(bot, 'forcedMove')
        assertPosEqual(bot.entity.position, initialPosition.offset(1, -2, 3))
      })
      test('can tp somebody else with relative positions', async () => {
        await Promise.all([onGround(bot), onGround(bot2)])
        const initialPosition = bot2.entity.position.clone()
        bot.chat('/tp bot2 ~1 ~-2 ~3')
        await once(bot2, 'forcedMove')
        assertPosEqual(bot2.entity.position, initialPosition.offset(1, -2, 3))
      })
    })
    test('can use /deop', async () => {
      await waitLoginMessage(bot)
      bot.chat('/deop bot')
      await waitMessage(bot, 'bot is deopped')
      bot.chat('/op bot')
      await waitMessage(bot, 'You do not have permission to use this command')
      serv.getPlayer('bot').op = true
    })
    test('can use /setblock', async () => {
      await once(bot, 'chunkColumnLoad')
      bot.chat('/setblock 1 2 3 95 0')
      let [, newBlock] = await once(bot, 'blockUpdate:' + new Vec3(1, 2, 3), {array: true})
      expect(newBlock.type).toEqual(95)
    })
    test('can use /xp', async () => {
      bot.chat('/xp 100')
      await once(bot, 'experience')
      expect(bot.experience.points).toEqual(100)
    })
  })
})