class RuboCop::Cop::Rails::FilePath

def check_for_file_join_with_rails_root(node)
  return unless file_join_nodes?(node)
  return unless node.arguments.any? { |e| rails_root_nodes?(e) }
  register_offense(node)
end

def check_for_rails_root_join_with_slash_separated_path(node)
  return unless style == :arguments
  return unless rails_root_nodes?(node)
  return unless rails_root_join_nodes?(node)
  return unless node.arguments.any? { |arg| string_with_slash?(arg) }
  register_offense(node)
end

def check_for_rails_root_join_with_string_arguments(node)
  return unless style == :slashes
  return unless rails_root_nodes?(node)
  return unless rails_root_join_nodes?(node)
  return unless node.arguments.size > 1
  return unless node.arguments.all?(&:str_type?)
  register_offense(node)
end

def message(_node)
  format(style == :arguments ? MSG_ARGUMENTS : MSG_SLASHES)
end

def on_dstr(node)
  return unless rails_root_nodes?(node)
  return unless node.children.last.source.start_with?('.') ||
                node.children.last.source.include?(File::SEPARATOR)
  register_offense(node)
end

def on_send(node)
  check_for_file_join_with_rails_root(node)
  check_for_rails_root_join_with_slash_separated_path(node)
  check_for_rails_root_join_with_string_arguments(node)
end

def register_offense(node)
  line_range = node.loc.column...node.loc.last_column
  source_range = source_range(processed_source.buffer, node.first_line,
                              line_range)
  add_offense(node, location: source_range)
end

def string_with_slash?(node)
  node.str_type? && node.source =~ %r{/}
end