class WMA:
  def __init__(self, unit, period, width):
    self._unit   = unit
    self._period = period
    self._width  = width

  def judge(self, status):
    cands = status.candles[self._unit]
    sum = 0
    den = 0
    for i in range(min(self._period-1, len(cands)-1)):
      sum += cands[i+1][3] * (i+1)
      den += i+1
    avg   = sum / den
    price = cands[0][3]

    width = price * self._width
    diff  = price - avg
    if diff < 0:
      return max(-1, diff/width)  # sell
    else:
      return min(1, diff/width)  # buy