# frozen_string_literal: true

module Yardcheck
  class Runner
    include Concord.new(:observations, :output), Memoizable

    # rubocop:disable MethodLength
    def self.run(args)
      options = { rspec: 'spec' }

      parser =
        OptionParser.new do |opt|
          opt.on(
            '--namespace NS',
            'Namespace to check documentation for and watch methods calls for'
          ) do |arg|
            options[:namespace] = arg
          end

          opt.on('--include PATH', 'Path to add to load path') do |arg|
            options[:include] = arg
          end

          opt.on('--require LIB', 'Library to require') do |arg|
            options[:require] = arg
          end

          opt.on('--rspec ARGS', 'Arguments to give to rspec') do |arg|
            options[:rspec] = arg
          end
        end

      parser.parse(args)

      arguments = options.fetch_values(:namespace, :include, :require, :rspec)
      namespace, include_path, require_target, rspec = arguments

      fail 'All arguments are required' if arguments.any?(&:nil?)

      $LOAD_PATH.unshift(include_path)
      require require_target

      rspec = rspec.split(' ')

      observations =
        Yardcheck::SpecObserver
          .run(rspec, namespace)
          .associate_with(Yardcheck::Documentation.parse)

      new(observations, $stderr)
    end

    def check
      warn_all(warnings)
      warn_all(offenses)
    end

    private

    def warnings
      observations
        .flat_map(&:documentation_warnings)
        .map(&:message)
    end

    def offenses
      combined_violations.map(&:offense)
    end

    def warn_all(output_lines)
      output_lines.map(&method(:warn))
    end

    def combined_violations
      violations.group_by(&:combination_identifier).flat_map do |_, grouped_violations|
        grouped_violations.reduce(:combine)
      end
    end
    memoize :combined_violations

    def violations
      observations
        .flat_map(&:violations)
        .uniq
        .compact
    end
    memoize :violations

    def warn(message)
      output.puts(message)
    end
  end # Runner
end # Yardcheck