codeclimate/codeclimate-rubocop

# frozen_string_literal: true

require "safe_yaml"
require "cc/engine/content_resolver"

SafeYAML::OPTIONS[:default_mode] = :safe

module CC
  module Engine
    class Issue < SimpleDelegator
      MULTIPLIER_REGEX = %r{\[([\d\.]+)\/([\d\.]+)\]}
      DEFAULT_REMEDIATION_POINTS = 50_000
      DEFAULT_BASE_POINTS = 200_000
      DEFAULT_OVERAGE_POINTS = 50_000

      def initialize(issue, path, cop_list: nil)
        @path = path
        @cop_list = cop_list

        super(issue)
      end

      # rubocop:disable Metrics/MethodLength
      def to_json
        hash = {
          type: "Issue",
          check_name: check_name,
          description: message,
          categories: [category],
          remediation_points: remediation_points,
          location: {
            path: path,
            positions: positions,
          },
        }
        hash[:content] = { body: content_body } if content_body.present?

        if (fingerprint = Fingerprint.new(path, cop_name, message).compute)
          hash[:fingerprint] = fingerprint
        end

        hash.to_json
      end

      def check_name
        "Rubocop/#{cop_name}"
      end

      def remediation_points
        if multiplier?
          base_points + overage_points
        else
          cop_definition.fetch("remediation_points", DEFAULT_REMEDIATION_POINTS)
        end
      end

      private

      attr_reader :path

      def multiplier?
        message.match(MULTIPLIER_REGEX)
      end

      def base_points
        cop_definition.fetch("base_points", DEFAULT_BASE_POINTS)
      end

      def cop_definition
        @cop_definition ||= cop_list.fetch(cop_name, {})
      end

      def cop_list
        @cop_list ||= YAML.load_file(expand_config_path("cops.yml"))
      end

      def expand_config_path(path)
        File.expand_path("../../../../config/#{path}", __FILE__)
      end

      def overage_points
        overage_points = cop_definition.
                         fetch("overage_points", DEFAULT_OVERAGE_POINTS)

        overage_points * multiplier
      end

      def multiplier
        result = message.scan(MULTIPLIER_REGEX)
        score, threshold = result[0]
        score.to_i - threshold.to_i
      end

      def category
        CategoryParser.new(cop_name).category
      end

      def positions
        {
          begin: {
            column: columns.first,
            line: lines.first,
          },
          end: {
            column: columns.last,
            line: lines.last,
          }
        }
      end

      # Increments column values as columns are 0-based in parser
      def columns
        return @columns if defined?(@columns)

        end_column = location.try(:last_column) || location.column
        @columns = [location.column + 1, end_column + 1]
      end

      def lines
        return @lines if defined?(@lines)

        begin_line = location.try(:first_line) || location.line
        end_line = location.try(:last_line) || location.line
        @lines = [begin_line, end_line]
      end

      def content_body
        return @content_body if defined?(@content_body)

        @content_body = ContentResolver.new(cop_name.underscore).content
      end
    end
  end
end