15 puzzle

main.js

'use strict'

const readline = require('readline')
const input = readline.createInterface({
  input: process.stdin,
  output: process.stdout
})

input.setPrompt('> ')

const Fifteen = (size) => {
  const setWidth = (convertedNumber, width) => {
    while (convertedNumber.length < width) {
      convertedNumber = ' ' + convertedNumber
    }
    return convertedNumber
  }

  const f = {}
  f.size = size || 4

  f.blankTileSymbol = setWidth(
    ' ',
    (f.size * f.size - 1).toString().length
  )
  f.blank = {
    x: f.size - 1,
    y: f.size - 1
  }

  f.board = new Array(f.size)
  for (let i = 0; i < f.size; i++) {
    f.board[i] = new Array(f.size)
    for (let j = 0; j < f.size; j++) {
      f.board[i][j] = setWidth(
        (f.size * i + j + 1).toString(),
        (f.size * f.size - 1).toString().length
      )
    }
  }

  f.board[f.blank.x][f.blank.y] = f.blankTileSymbol

  f.score = 0

  f.moveTile = (tile) => {
    f.board[f.blank.y][f.blank.x] = f.board[tile.y][tile.x]
    f.board[tile.y][tile.x] = f.blankTileSymbol
    f.blank = tile
    f.score++
  }

  f.moveUp = () => {
    if (f.blank.y > 0) {
      f.moveTile({ x: f.blank.x, y: f.blank.y - 1 })
    }
  }

  f.moveDown = () => {
    if (f.blank.y < 3) {
      f.moveTile({ x: f.blank.x, y: f.blank.y + 1 })
    }
  }

  f.moveLeft = () => {
    if (f.blank.x > 0) {
      f.moveTile({ x: f.blank.x - 1, y: f.blank.y })
    }
  }

  f.moveRight = () => {
    if (f.blank.x < 3) {
      f.moveTile({ x: f.blank.x + 1, y: f.blank.y })
    }
  }

  f.draw = () => {
    process.stdout.write('\u001b[2J\u001b[0;0H')
    f.board.forEach((row) => {
      console.log(row)
    })
    console.log(`Player Score: ${f.score}`)
  }

  f.shuffle = (seed) => {
    const chooseRandomDirection = () => {
      const directions = [f.moveUp, f.moveDown, f.moveRight, f.moveLeft]
      const index = Math.floor(Math.random() * 4)
      return directions[index]
    }

    for (let i = 0; i < seed; i++) {
      const randomDirection = chooseRandomDirection()
      randomDirection()
    }

    f.score = 0
  }

  f.isCompleted = () => {
    for (let i = 0; i < f.size; i++) {
      for (let j = 0; j < f.size; j++) {
        if (f.board[i][j] !== f.blankTileSymbol) {
          const a = setWidth(
            (f.size * i + j + 1).toString(),
            (f.size * f.size - 1).toString().length
          )
          if (f.board[i][j] !== a) {
            return false
          }
        } else if (i * f.size + j + 1 !== f.size * f.size) {
          return false
        }
      }
    }
    return true
  }

  return f
}

const fifteen = Fifteen(4)
while (fifteen.isCompleted()) {
  fifteen.shuffle(100)
}

fifteen.draw()
input.prompt()

input.on('line', reply => {
  if (reply === 'exit') {
    input.close()
  } else if (reply === 'w') {
    fifteen.moveUp()
  } else if (reply === 's') {
    fifteen.moveDown()
  } else if (reply === 'a') {
    fifteen.moveLeft()
  } else if (reply === 'd') {
    fifteen.moveRight()
  }

  fifteen.draw()
  if (fifteen.isCompleted()) {
    console.log(`Congratulations! Your score is ${fifteen.score}!`)
    input.close()
  }
  input.prompt()
}).on('close', () => {
  process.exit(0)
})