class RuboCop::Runner

def aborting?
  @aborting
end

def add_redundant_disables(file, offenses, source)
  team_for_redundant_disables(file, offenses, source) do |team|
    new_offenses, redundant_updated = inspect_file(source, team)
    offenses += new_offenses
    if redundant_updated
      # Do one extra inspection loop if any redundant disables were
      # removed. This is done in order to find rubocop:enable directives that
      # have now become useless.
      _source, new_offenses = do_inspection_loop(file)
      offenses |= new_offenses
    end
  end
  offenses
end

def cached_result(file, team)
  ResultCache.new(file, team, @options, @config_store)
end

def cached_run?
  @cached_run ||=
    (@options[:cache] == 'true' ||
     (@options[:cache] != 'false' && @config_store.for_pwd.for_all_cops['UseCache'])) &&
    # When running --auto-gen-config, there's some processing done in the
    # cops related to calculating the Max parameters for Metrics cops. We
    # need to do that processing and cannot use caching.
    !@options[:auto_gen_config] &&
    # We can't cache results from code which is piped in to stdin
    !@options[:stdin]
end

def check_for_infinite_loop(processed_source, offenses_by_iteration)
  checksum = processed_source.checksum
  if (loop_start_index = @processed_sources.index(checksum))
    raise InfiniteCorrectionLoop.new(
      processed_source.path,
      offenses_by_iteration,
      loop_start: loop_start_index
    )
  end
  @processed_sources << checksum
end

def check_for_redundant_disables?(source)
  return false if source.disabled_line_ranges.empty? || except_redundant_cop_disable_directive?
  !@options[:only]
end

def considered_failure?(offense)
  return false if offense.disabled?
  # For :autocorrect level, any correctable offense is a failure, regardless of severity
  return true if @options[:fail_level] == :autocorrect && offense.correctable?
  !offense.corrected? && offense.severity >= minimum_severity_to_fail
end

def default_config(cop_name)
  RuboCop::ConfigLoader.default_configuration[cop_name]
end

def default_ruby_extractor
  lambda do |processed_source|
    [
      {
        offset: 0,
        processed_source: processed_source
      }
    ]
  end
end

def do_inspection_loop(file)
  processed_source = get_processed_source(file)
  # This variable is 2d array used to track corrected offenses after each
  # inspection iteration. This is used to output meaningful infinite loop
  # error message.
  offenses_by_iteration = []
  # When running with --autocorrect, we need to inspect the file (which
  # includes writing a corrected version of it) until no more corrections
  # are made. This is because automatic corrections can introduce new
  # offenses. In the normal case the loop is only executed once.
  iterate_until_no_changes(processed_source, offenses_by_iteration) do
    # The offenses that couldn't be corrected will be found again so we
    # only keep the corrected ones in order to avoid duplicate reporting.
    !offenses_by_iteration.empty? && offenses_by_iteration.last.select!(&:corrected?)
    new_offenses, updated_source_file = inspect_file(processed_source)
    offenses_by_iteration.push(new_offenses)
    # We have to reprocess the source to pickup the changes. Since the
    # change could (theoretically) introduce parsing errors, we break the
    # loop if we find any.
    break unless updated_source_file
    processed_source = get_processed_source(file)
  end
  # Return summary of corrected offenses after all iterations
  offenses = offenses_by_iteration.flatten.uniq
  [processed_source, offenses]
end

def each_inspected_file(files)
  files.reduce(true) do |all_passed, file|
    offenses = process_file(file)
    yield file
    if offenses.any? { |o| considered_failure?(o) && offense_displayed?(o) }
      break false if @options[:fail_fast]
      next false
    end
    all_passed
  end
end

def except_redundant_cop_disable_directive?
  @options[:except] && (@options[:except] & REDUNDANT_COP_DISABLE_DIRECTIVE_RULES).any?
end

def extract_ruby_sources(processed_source)
  self.class.ruby_extractors.find do |ruby_extractor|
    result = ruby_extractor.call(processed_source)
    break result if result
  rescue StandardError
    location = if ruby_extractor.is_a?(Proc)
                 ruby_extractor.source_location
               else
                 ruby_extractor.method(:call).source_location
               end
    raise Error, "Ruby extractor #{location[0]} failed to process #{processed_source.path}."
  end
end

def file_finished(file, offenses)
  offenses = offenses_to_report(offenses)
  formatter_set.file_finished(file, offenses)
end

def file_offense_cache(file)
  config = @config_store.for_file(file)
  cache = cached_result(file, standby_team(config)) if cached_run?
  if cache&.valid?
    offenses = cache.load
    # If we're running --autocorrect and the cache says there are
    # offenses, we need to actually inspect the file. If the cache shows no
    # offenses, we're good.
    real_run_needed = @options[:autocorrect] && offenses.any?
  else
    real_run_needed = true
  end
  if real_run_needed
    offenses = yield
    save_in_cache(cache, offenses)
  end
  offenses
end

def file_offenses(file)
  file_offense_cache(file) do
    source, offenses = do_inspection_loop(file)
    offenses = add_redundant_disables(file, offenses.compact.sort, source)
    offenses.sort.reject(&:disabled?).freeze
  end
end

def file_started(file)
  puts "Scanning #{file}" if @options[:debug]
  formatter_set.file_started(file, cli_options: @options, config_store: @config_store)
end

def filter_cop_classes(cop_classes, config)
  # use only cops that link to a style guide if requested
  return unless style_guide_cops_only?(config)
  cop_classes.select! { |cop| config.for_cop(cop)['StyleGuide'] }
end

def find_target_files(paths)
  target_finder = TargetFinder.new(@config_store, @options)
  mode = if @options[:only_recognized_file_types]
           :only_recognized_file_types
         else
           :all_file_types
         end
  target_files = target_finder.find(paths, mode)
  target_files.each(&:freeze).freeze
end

def formatter_set
  @formatter_set ||= begin
    set = Formatter::FormatterSet.new(@options)
    pairs = @options[:formatters] || [['progress']]
    pairs.each { |formatter_key, output_path| set.add_formatter(formatter_key, output_path) }
    set
  end
end

def get_processed_source(file)
  config = @config_store.for_file(file)
  ruby_version = config.target_ruby_version
  parser_engine = config.parser_engine
  processed_source = if @options[:stdin]
                       ProcessedSource.new(
                         @options[:stdin], ruby_version, file, parser_engine: parser_engine
                       )
                     else
                       begin
                         ProcessedSource.from_file(
                           file, ruby_version, parser_engine: parser_engine
                         )
                       rescue Errno::ENOENT
                         raise RuboCop::Error, "No such file or directory: #{file}"
                       end
                     end
  processed_source.config = config
  processed_source.registry = mobilized_cop_classes(config)
  processed_source
end

def initialize(options, config_store)
  @options = options
  @config_store = config_store
  @errors = []
  @warnings = []
  @aborting = false
end

def inspect_file(processed_source, team = mobilize_team(processed_source))
  extracted_ruby_sources = extract_ruby_sources(processed_source)
  offenses = extracted_ruby_sources.flat_map do |extracted_ruby_source|
    report = team.investigate(
      extracted_ruby_source[:processed_source],
      offset: extracted_ruby_source[:offset],
      original: processed_source
    )
    @errors.concat(team.errors)
    @warnings.concat(team.warnings)
    report.offenses
  end
  [offenses, team.updated_source_file?]
end

def inspect_files(files)
  inspected_files = []
  formatter_set.started(files)
  each_inspected_file(files) { |file| inspected_files << file }
ensure
  # OPTIMIZE: Calling `ResultCache.cleanup` takes time. This optimization
  # mainly targets editors that integrates RuboCop. When RuboCop is run
  # by an editor, it should be inspecting only one file.
  if files.size > 1 && cached_run?
    ResultCache.cleanup(@config_store, @options[:debug], @options[:cache_root])
  end
  formatter_set.finished(inspected_files.freeze)
  formatter_set.close_output_files
end

def iterate_until_no_changes(source, offenses_by_iteration)
  # Keep track of the state of the source. If a cop modifies the source
  # and another cop undoes it producing identical source we have an
  # infinite loop.
  @processed_sources = []
  # It is also possible for a cop to keep adding indefinitely to a file,
  # making it bigger and bigger. If the inspection loop runs for an
  # excessively high number of iterations, this is likely happening.
  iterations = 0
  loop do
    check_for_infinite_loop(source, offenses_by_iteration)
    if (iterations += 1) > MAX_ITERATIONS
      raise InfiniteCorrectionLoop.new(source.path, offenses_by_iteration)
    end
    source = yield
    break unless source
  end
end

def list_files(paths)
  paths.each { |path| puts PathUtil.relative_path(path) }
end

def mark_as_safe_by_config?(config)
  config.nil? || (config.fetch('Safe', true) && config.fetch('SafeAutoCorrect', true))
end

def minimum_severity_to_fail
  @minimum_severity_to_fail ||= begin
    # Unless given explicitly as `fail_level`, `:info` severity offenses do not fail
    name = @options[:fail_level] || :refactor
    # autocorrect is a fake level - use the default
    RuboCop::Cop::Severity.new(name == :autocorrect ? :refactor : name)
  end
end

def mobilize_team(processed_source)
  config = @config_store.for_file(processed_source.path)
  Cop::Team.mobilize(mobilized_cop_classes(config), config, @options)
end

def mobilized_cop_classes(config) # rubocop:disable Metrics/AbcSize
  @mobilized_cop_classes ||= {}.compare_by_identity
  @mobilized_cop_classes[config] ||= begin
    cop_classes = Cop::Registry.all
    # `@options[:only]` and `@options[:except]` are not qualified until
    # needed so that the Registry can be fully loaded, including any
    # cops added by `require`s.
    qualify_option_cop_names
    OptionsValidator.new(@options).validate_cop_options
    if @options[:only]
      cop_classes.select! { |c| c.match?(@options[:only]) }
    else
      filter_cop_classes(cop_classes, config)
    end
    cop_classes.reject! { |c| c.match?(@options[:except]) }
    Cop::Registry.new(cop_classes, @options)
  end
end

def offense_displayed?(offense)
  if @options[:display_only_fail_level_offenses]
    considered_failure?(offense)
  elsif @options[:display_only_safe_correctable]
    supports_safe_autocorrect?(offense)
  elsif @options[:display_only_correctable]
    offense.correctable?
  else
    true
  end
end

def offenses_to_report(offenses)
  offenses.select { |o| offense_displayed?(o) }
end

def process_file(file)
  file_started(file)
  offenses = file_offenses(file)
rescue InfiniteCorrectionLoop => e
  raise e if @options[:raise_cop_error]
  errors << e
  warn Rainbow(e.message).red
  offenses = e.offenses.compact.sort.freeze
ensure
  file_finished(file, offenses || [])
end

def qualify_option_cop_names
  %i[only except].each do |option|
    next unless @options[option]
    @options[option].map! do |cop_name|
      Cop::Registry.qualified_cop_name(cop_name, "--#{option} option")
    end
  end
end

def redundant_cop_disable_directive(file)
  config = @config_store.for_file(file)
  return unless config.for_cop(Cop::Lint::RedundantCopDisableDirective).fetch('Enabled')
  cop = Cop::Lint::RedundantCopDisableDirective.new(config, @options)
  yield cop if cop.relevant_file?(file)
end

def ruby_extractors
  @ruby_extractors ||= [default_ruby_extractor]
end

def run(paths)
  target_files = find_target_files(paths)
  if @options[:list_target_files]
    list_files(target_files)
  else
    warm_cache(target_files) if @options[:parallel]
    inspect_files(target_files)
  end
rescue Interrupt
  self.aborting = true
  warn ''
  warn 'Exiting...'
  false
end

def save_in_cache(cache, offenses)
  return unless cache
  # Caching results when a cop has crashed would prevent the crash in the
  # next run, since the cop would not be called then. We want crashes to
  # show up the same in each run.
  return if errors.any? || warnings.any?
  cache.save(offenses)
end

def standby_team(config)
  @team_by_config ||= {}.compare_by_identity
  @team_by_config[config] ||=
    Cop::Team.mobilize(mobilized_cop_classes(config), config, @options)
end

def style_guide_cops_only?(config)
  @options[:only_guide_cops] || config.for_all_cops['StyleGuideCopsOnly']
end

def supports_safe_autocorrect?(offense)
  cop_class = Cop::Registry.global.find_by_cop_name(offense.cop_name)
  default_cfg = default_config(offense.cop_name)
  offense.correctable? &&
    cop_class&.support_autocorrect? && mark_as_safe_by_config?(default_cfg)
end

def team_for_redundant_disables(file, offenses, source)
  return unless check_for_redundant_disables?(source)
  config = @config_store.for_file(file)
  team = Cop::Team.mobilize([Cop::Lint::RedundantCopDisableDirective], config, @options)
  return if team.cops.empty?
  team.cops.first.offenses_to_check = offenses
  yield team
end

def warm_cache(target_files)
  saved_options = @options.dup
  if target_files.length <= 1
    puts 'Skipping parallel inspection: only a single file needs inspection' if @options[:debug]
    return
  end
  puts 'Running parallel inspection' if @options[:debug]
  %i[autocorrect safe_autocorrect].each { |opt| @options[opt] = false }
  Parallel.each(target_files) { |target_file| file_offenses(target_file) }
ensure
  @options = saved_options
end