class ActiveRecord::Import::ValueSetsBytesParser

def self.parse(values, options)
  new(values, options).parse
end

def initialize(values, options)
  @values = values
  @reserved_bytes = options[:reserved_bytes]
  @max_bytes = options[:max_bytes]
end

def parse
  value_sets = []
  arr, current_arr_values_size, current_size = [], 0, 0
  values.each_with_index do |val,i|
    comma_bytes = arr.size
    bytes_thus_far = reserved_bytes + current_size + val.bytesize + comma_bytes
    if bytes_thus_far <= max_bytes
      current_size += val.bytesize
      arr << val
    else
      value_sets << arr
      arr = [ val ]
      current_size = val.bytesize
    end
    # if we're on the last iteration push whatever we have in arr to value_sets
    value_sets << arr if i == (values.size-1)
  end
  [ *value_sets ]
end