class EightyBit private (number : Int, list:List[Int]) {
  private val binaryNumArr = number.toBinaryString.split("").toList.map(_.toInt)
  println(binaryNumArr)
  private val sign = if (-1*number <= 0) 0 else 1
  var digits: List[Int] = if (list == Nil) List.fill(80-binaryNumArr.length)(0) ::: binaryNumArr  else list

  private def this(digits:List[Int]) = {
    this(0, digits)
  }

  def this(num:Int) = {
    this(num, Nil)
  }

  private val sum : (List[Int], List[Int], List[Int], Int) => List[Int] = {
    case (Nil, Nil, res, 0) => res
    case (Nil, Nil, res, r) => r%2::res
    case (x::a, Nil, res, r) => res
    case (Nil, x::b, res, r) => res
    case (x1::a, x2::b, res, r) => sum(a, b, (x1+x2+r)%2::res, (x1+x2+r)/2)
  }

  def << (n: Int): EightyBit = {
    val (x,y) = this.digits.splitAt(n)
    new EightyBit(y:::List.fill(n)(0))
  }

  def + (num:EightyBit): EightyBit = {
    new EightyBit(this.sum(this.digits.reverse, num.digits.reverse, List[Int](), 0))
  }

  def * (num:EightyBit): EightyBit = {
    this.digits.reverse.zipWithIndex.foldLeft(new EightyBit(0)) { (product:EightyBit, rank:(Int, Int)) =>
      if (rank._1 == 1) product + (num << rank._2) else product
    }
  }

  def unary_- ():EightyBit = {
    val temp = new EightyBit(this.digits.map(e => if (e == 0) 1 else 0))
    val res = temp + new EightyBit(1)
    res
  }

  def value:Int = {
    this.digits.reverse.zipWithIndex.foldLeft(0) {(res:Int, rank:(Int, Int)) => res + (rank._1 * (1 << rank._2))}
  }

}

object Main{
  def main(args: Array[String]): Unit = {
    val a = new EightyBit(-7)
    val f = new EightyBit(5)
    f.digits = List(1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1,1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0)
    println(f.value)
    val b = new EightyBit(8)
    val c = a*b
    var d = a+b
    println(d.digits)
    d = -d
  }
}