class RuboCop::CLI

def act_on_options
  handle_exiting_options
  ConfigLoader.debug = @options[:debug]
  ConfigLoader.auto_gen_config = @options[:auto_gen_config]
  @config_store.options_config = @options[:config] if @options[:config]
  Rainbow.enabled = false unless @options[:color]
end

def display_error_summary(errors)
  return if errors.empty?
  plural = errors.count > 1 ? 's' : ''
  warn "\n#{errors.count} error#{plural} occurred:".color(:red)
  errors.each { |error| warn error }
  warn <<-END.strip_indent
    Errors are usually caused by RuboCop bugs.
    Please, report your problems to RuboCop's issue tracker.
    Mention the following information in the issue report:
    #{RuboCop::Version.version(true)}
  END
end

def handle_exiting_options
  return unless Options::EXITING_OPTIONS.any? { |o| @options.key? o }
  puts RuboCop::Version.version(false) if @options[:version]
  puts RuboCop::Version.version(true) if @options[:verbose_version]
  print_available_cops if @options[:show_cops]
  exit(0)
end

def initialize
  @options = {}
  @config_store = ConfigStore.new
end

def print_available_cops
  cops = Cop::Cop.all
  show_all = @options[:show_cops].empty?
  if show_all
    puts "# Available cops (#{cops.length}) + config for #{Dir.pwd}: "
  end
  cops.types.sort!.each { |type| print_cops_of_type(cops, type, show_all) }
end

def print_cops_of_type(cops, type, show_all)
  cops_of_this_type = cops.with_type(type).sort_by!(&:cop_name)
  if show_all
    puts "# Type '#{type.to_s.capitalize}' (#{cops_of_this_type.size}):"
  end
  selected_cops = cops_of_this_type.select do |cop|
    show_all || @options[:show_cops].include?(cop.cop_name)
  end
  selected_cops.each do |cop|
    puts '# Supports --auto-correct' if cop.new.support_autocorrect?
    puts "#{cop.cop_name}:"
    cnf = @config_store.for(Dir.pwd.to_s).for_cop(cop)
    puts cnf.to_yaml.lines.to_a[1..-1].map { |line| '  ' + line }
    puts
  end
end

def run(args = ARGV)
  @options, paths = Options.new.parse(args)
  act_on_options
  runner = Runner.new(@options, @config_store)
  trap_interrupt(runner)
  all_passed = runner.run(paths)
  display_error_summary(runner.errors)
  all_passed && !runner.aborting? ? 0 : 1
rescue Cop::AmbiguousCopName => e
  $stderr.puts "Ambiguous cop name #{e.message} needs namespace " \
               'qualifier.'
  return 1
rescue => e
  $stderr.puts e.message
  $stderr.puts e.backtrace
  return 1
end

def trap_interrupt(runner)
  Signal.trap('INT') do
    exit!(1) if runner.aborting?
    runner.abort
    $stderr.puts
    $stderr.puts 'Exiting... Interrupt again to exit immediately.'
  end
end