class RuboCop::OptionsValidator

def self.validate_cop_list(names)
  return unless names
  namespaces = Cop::Cop.all.types.map { |t| t.to_s.capitalize }
  names.each do |name|
    next if Cop::Cop.all.any? { |c| c.cop_name == name }
    next if namespaces.include?(name)
    next if %w(Syntax Lint/Syntax).include?(name)
    raise ArgumentError, "Unrecognized cop or namespace: #{name}."
  end
end

def boolean_or_empty_cache?
  !@options.key?(:cache) || %w(true false).include?(@options[:cache])
end

def except_syntax?
  @options.key?(:except) &&
    (@options[:except] & %w(Lint/Syntax Syntax)).any?
end

def incompatible_options
  @incompatible_options ||= @options.keys & Options::EXITING_OPTIONS
end

def initialize(options)
  @options = options
end

def no_offense_counts_without_auto_gen_config?
  @options.key?(:no_offense_counts) && !@options.key?(:auto_gen_config)
end

def only_includes_unneeded_disable?
  @options.key?(:only) &&
    (@options[:only] & %w(Lint/UnneededDisable UnneededDisable)).any?
end

def validate_compatibility
  if only_includes_unneeded_disable?
    raise ArgumentError, 'Lint/UnneededDisable can not be used with --only.'
  end
  if except_syntax?
    raise ArgumentError, 'Syntax checking can not be turned off.'
  end
  unless boolean_or_empty_cache?
    raise ArgumentError, '-C/--cache argument must be true or false'
  end
  if no_offense_counts_without_auto_gen_config?
    raise ArgumentError, '--no-offense-counts can only be used together ' \
                         'with --auto-gen-config.'
  end
  return if incompatible_options.size <= 1
  raise ArgumentError, 'Incompatible cli options: ' \
                       "#{incompatible_options.inspect}"
end

def validate_exclude_limit_option(args)
  if @options[:exclude_limit] !~ /^\d+$/
    # Emulate OptionParser's behavior to make failures consistent regardless
    # of option order.
    raise OptionParser::MissingArgument
  end
  # --exclude-limit is valid if there's a parsed or yet unparsed
  # --auto-gen-config.
  return if @options[:auto_gen_config] || args.include?('--auto-gen-config')
  raise ArgumentError,
        '--exclude-limit can only be used with --auto-gen-config.'
end