class RuboCop::Cop::Lint::ParenthesesAsGroupedExpression

def chained_calls?(node)
  first_argument = node.first_argument
  first_argument.call_type? && (node.children.last&.children&.count || 0) > 1
end

def first_argument_block_type?(first_arg)
  first_arg.block_type? || first_arg.numblock_type?
end

def first_argument_starts_with_left_parenthesis?(node)
  node.first_argument.source.start_with?('(')
end

def on_send(node)
  return if valid_context?(node)
  space_length = spaces_before_left_parenthesis(node)
  return unless space_length.positive?
  range = space_range(node.first_argument.source_range, space_length)
  message = format(MSG, argument: node.first_argument.source)
  add_offense(range, message: message) { |corrector| corrector.remove(range) }
end

def space_range(expr, space_length)
  range_between(expr.begin_pos - space_length, expr.begin_pos)
end

def spaces_before_left_parenthesis(node)
  receiver = node.receiver
  receiver_length = if receiver
                      receiver.source.length
                    else
                      0
                    end
  without_receiver = node.source[receiver_length..]
  # Escape question mark if any.
  method_regexp = Regexp.escape(node.method_name)
  match = without_receiver.match(/^\s*&?\.?\s*#{method_regexp}(\s+)\(/)
  match ? match.captures[0].length : 0
end

def ternary_expression?(node)
  node.if_type? && node.ternary?
end

def valid_context?(node)
  unless node.arguments.one? && first_argument_starts_with_left_parenthesis?(node)
    return true
  end
  return true if first_argument_block_type?(node.first_argument)
  node.operator_method? || node.setter_method? || chained_calls?(node) ||
    valid_first_argument?(node.first_argument)
end

def valid_first_argument?(first_arg)
  first_arg.operator_keyword? || first_arg.hash_type? || ternary_expression?(first_arg)
end