class RuboCop::Cop::Style::NestedModifier

def add_parentheses_to_method_arguments(send_node)
  expr = +''
  expr << "#{send_node.receiver.source}." if send_node.receiver
  expr << send_node.method_name.to_s
  expr << "(#{send_node.arguments.map(&:source).join(', ')})"
  expr
end

def autocorrect(corrector, node)
  return unless node.if_type? && node.parent.if_type?
  range = range_between(node.loc.keyword.begin_pos,
                        node.parent.condition.source_range.end_pos)
  corrector.replace(range, new_expression(node))
end

def check(node)
  return if part_of_ignored_node?(node)
  return unless modifier?(node) && modifier?(node.parent)
  add_offense(node.loc.keyword) { |corrector| autocorrect(corrector, node) }
  ignore_node(node)
end

def left_hand_operand(node, operator)
  expr = node.condition.source
  expr = "(#{expr})" if node.condition.or_type? && operator == '&&'
  expr
end

def modifier?(node)
  node&.basic_conditional? && node.modifier_form?
end

def new_expression(inner_node)
  outer_node = inner_node.parent
  operator = replacement_operator(outer_node.keyword)
  lh_operand = left_hand_operand(outer_node, operator)
  rh_operand = right_hand_operand(inner_node, outer_node.keyword)
  "#{outer_node.keyword} #{lh_operand} #{operator} #{rh_operand}"
end

def on_while(node)
  check(node)
end

def replacement_operator(keyword)
  keyword == 'if' ? '&&' : '||'
end

def requires_parens?(node)
  node.or_type? || !(RuboCop::AST::Node::COMPARISON_OPERATORS & node.children).empty?
end

def right_hand_operand(node, left_hand_keyword)
  condition = node.condition
  expr = if condition.send_type? && !condition.arguments.empty? &&
            !condition.operator_method?
           add_parentheses_to_method_arguments(condition)
         else
           condition.source
         end
  expr = "(#{expr})" if requires_parens?(condition)
  expr = "!#{expr}" unless left_hand_keyword == node.keyword
  expr
end