# frozen_string_literal: true

module RuboCop
  # This module holds the RuboCop version information.
  module Version
    STRING = '1.2.0'

    MSG = '%<version>s (using Parser %<parser_version>s, '\
          'rubocop-ast %<rubocop_ast_version>s, ' \
          'running on %<ruby_engine>s %<ruby_version>s %<ruby_platform>s)'

    CANONICAL_FEATURE_NAMES = { 'Rspec' => 'RSpec' }.freeze

    # @api private
    def self.version(debug: false, env: nil)
      if debug
        verbose_version = format(MSG, version: STRING, parser_version: Parser::VERSION,
                                      rubocop_ast_version: RuboCop::AST::Version::STRING,
                                      ruby_engine: RUBY_ENGINE, ruby_version: RUBY_VERSION,
                                      ruby_platform: RUBY_PLATFORM)
        return verbose_version unless env

        extension_versions = extension_versions(env)
        return verbose_version if extension_versions.empty?

        <<~VERSIONS
          #{verbose_version}
          #{extension_versions.join("\n")}
        VERSIONS
      else
        STRING
      end
    end

    # @api private
    def self.extension_versions(env)
      env.config_store.for_pwd.loaded_features.sort.map do |loaded_feature|
        next unless (match = loaded_feature.match(/rubocop-(?<feature>.*)/))

        feature = match[:feature]
        begin
          require "rubocop/#{feature}/version"
        rescue LoadError
          # Not worth mentioning libs that are not installed
        else
          next unless (feature_version = feature_version(feature))

          "  - #{loaded_feature} #{feature_version}"
        end
      end.compact
    end

    # Returns feature version in one of two ways:
    #
    # * Find by RuboCop core version style (e.g. rubocop-performance, rubocop-rspec)
    # * Find by `bundle gem` version style (e.g. rubocop-rake)
    #
    # @api private
    def self.feature_version(feature)
      capitalized_feature = feature.capitalize
      extension_name = CANONICAL_FEATURE_NAMES.fetch(capitalized_feature, capitalized_feature)

      # Find by RuboCop core version style (e.g. rubocop-performance, rubocop-rspec)
      RuboCop.const_get(extension_name)::Version::STRING
    rescue NameError
      begin
        # Find by `bundle gem` version style (e.g. rubocop-rake, rubocop-packaging)
        RuboCop.const_get(extension_name)::VERSION
      rescue NameError
        # noop
      end
    end

    # @api private
    def self.document_version
      STRING.match('\d+\.\d+').to_s
    end
  end
end