const { Physics, PlayerState } = require('prismarine-physics')
const { Vec3 } = require('vec3')

const mcData = require('minecraft-data')('1.13.2')
const Block = require('prismarine-block')('1.13.2')

const fakeWorld = {
  getBlock: (pos) => {
    const type = (pos.y < 60) ? mcData.blocksByName.stone.id : mcData.blocksByName.air.id
    const b = new Block(type, 0, 0)
    b.position = pos
    return b
  }
}

function fakePlayer (pos, baseVersion) {
  return {
    entity: {
      position: pos,
      velocity: new Vec3(0, 0, 0),
      onGround: false,
      isInWater: false,
      isInLava: false,
      isInWeb: false,
      elytraFlying: false,
      isCollidedHorizontally: false,
      isCollidedVertically: false,
      yaw: 0,
      pitch: 0,
      effects: []
    },
    inventory: {
      slots: []
    },
    jumpTicks: 0,
    jumpQueued: false,
    fireworkRocketDuration: 0,
    version: baseVersion
  }
}

const physics = Physics(mcData, fakeWorld)
const controls = {
  forward: false,
  back: false,
  left: false,
  right: false,
  jump: false,
  sprint: false,
  sneak: false
}
const player = fakePlayer(new Vec3(0, 80, 0), mcData.version.version)
const playerState = new PlayerState(player, controls)

while (!player.entity.onGround) {
  physics.simulatePlayer(playerState, fakeWorld).apply(player)
}

console.log(player.entity.position)