class ActiveModel::Type::Integer

def _limit
  limit || DEFAULT_LIMIT
end

def cast_value(value)
  case value
  when true then 1
  when false then 0
  else
    value.to_i rescue nil
  end
end

def deserialize(value)
  return if value.nil?
  value.to_i
end

def ensure_in_range(value)
  unless range.cover?(value)
    raise ActiveModel::RangeError, "#{value} is out of range for #{self.class} with limit #{_limit} bytes"
  end
end

def initialize(*)
  super
  @range = min_value...max_value
end

def max_value
  1 << (_limit * 8 - 1) # 8 bits per byte with one bit for sign
end

def min_value
  -max_value
end

def serialize(value)
  result = cast(value)
  if result
    ensure_in_range(result)
  end
  result
end

def type
  :integer
end