class EacRubyUtils::CommonConstructor::InstanceInitialize

def arg_value(arg_name)
  arg_index = common_constructor.args.index(arg_name)
  if arg_index < args.count
    args[arg_index]
  else
    common_constructor.default_values[arg_index - common_constructor.args_count_min]
  end
end

def initialize(common_constructor, args, object, block)
  @common_constructor = common_constructor
  @args = args
  @object = object
  @block = block
end

def object_after_callback
  return unless common_constructor.after_set_block
  object.instance_eval(&common_constructor.after_set_block)
end

def object_attribute_set(attr_name, attr_value)
  object.send("#{attr_name}=", attr_value)
end

def object_attributes_set
  common_constructor.args.each do |arg_name|
    object_attribute_set(arg_name, arg_value(arg_name))
  end
end

def object_block_set
  block_arg = common_constructor.block_arg
  object_attribute_set(block_arg, block) if block_arg
end

def perform
  validate_args_count
  object.run_callbacks :initialize do
    object_attributes_set
    object_block_set
    object_after_callback
  end
end

def validate_args_count
  return if common_constructor.args_count.include?(args.count)
  raise ArgumentError, "#{object.class}.initialize: wrong number of arguments " \
                       "(given #{args.count}, expected #{common_constructor.args_count})"
end