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]
  if @options[:color]
    # color output explicitly forced on
    Rainbow.enabled = true
  elsif @options[:color] == false
    # color output explicitly forced off
    Rainbow.enabled = false
  end
end

def apply_default_formatter
  # This must be done after the options have already been processed,
  # because they can affect how ConfigStore behaves
  @options[:formatters] ||= begin
    cfg = @config_store.for(Dir.pwd).for_all_cops
    formatter = cfg['DefaultFormatter'] || 'progress'
    [[formatter, @options[:output_path]]]
  end
  if @options[:auto_gen_config]
    @options[:formatters] << [Formatter::DisabledConfigFormatter,
                              ConfigLoader::AUTO_GENERATED_FILE]
  end
end

def config_lines(cop)
  cnf = @config_store.for(Dir.pwd).for_cop(cop)
  cnf.to_yaml.lines.to_a.butfirst.map { |line| '  ' + line }
end

def cops_of_type(cops, type)
  cops.with_type(type).sort_by!(&:cop_name)
end

def display_error_summary(errors)
  return if errors.empty?
  warn Rainbow("\n#{pluralize(errors.size, 'error')} occurred:").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 display_warning_summary(warnings)
  return if warnings.empty?
  warn Rainbow("\n#{pluralize(warnings.size, 'warning')}:").yellow
  warnings.each { |warning| warn warning }
end

def execute_runner(paths)
  runner = Runner.new(@options, @config_store)
  trap_interrupt(runner)
  all_passed = runner.run(paths)
  display_warning_summary(runner.warnings)
  display_error_summary(runner.errors)
  maybe_print_corrected_source
  all_passed && !runner.aborting? && runner.errors.empty? ? 0 : 1
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]
  raise Finished
end

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

def maybe_print_corrected_source
  # If we are asked to autocorrect source code read from stdin, the only
  # reasonable place to write it is to stdout
  # Unfortunately, we also write other information to stdout
  # So a delimiter is needed for tools to easily identify where the
  # autocorrected source begins
  return unless @options[:stdin] && @options[:auto_correct]
  puts '=' * 20
  print @options[:stdin]
end

def print_available_cops
  # Load the configs so the require()s are done for custom cops
  @config_store.for(Dir.pwd)
  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)
  selected_cops = if show_all
                    cops_of_type(cops, type)
                  else
                    selected_cops_of_type(cops, type)
                  end
  if show_all
    puts "# Type '#{type.to_s.capitalize}' (#{selected_cops.size}):"
  end
  selected_cops.each do |cop|
    puts '# Supports --auto-correct' if cop.new.support_autocorrect?
    puts "#{cop.cop_name}:"
    puts config_lines(cop)
    puts
  end
end

def run(args = ARGV)
  @options, paths = Options.new.parse(args)
  act_on_options
  apply_default_formatter
  execute_runner(paths)
rescue RuboCop::Error => e
  $stderr.puts Rainbow("Error: #{e.message}").red
  return 2
rescue Finished
  return 0
rescue StandardError, SyntaxError => e
  $stderr.puts e.message
  $stderr.puts e.backtrace
  return 2
end

def selected_cops_of_type(cops, type)
  cops_of_type(cops, type).select do |cop|
    @options[:show_cops].include?(cop.cop_name)
  end
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