sul-dlss/dor-services-app

# frozen_string_literal: true

module Indexing
  module Builders
    # Builds the temporal fields for a solr document
    class TemporalBuilder
      # @param [Array<Cocina::Models::Subject>] subjects
      # @return [Array<String>] the temporal values for Solr
      def self.build(subjects)
        new(subjects).build
      end

      def initialize(subjects)
        @subjects = Array(subjects)
      end

      def build
        extract_temporal_from_subjects(subjects)
      end

      def extract_temporal_from_subjects(local_subjects)
        (
          build_temporal_nodes(local_subjects.select { |node| node.type == 'time' }) +
          local_subjects.reject(&:type).flat_map do |subject|
            next extract_temporal_from_subjects(subject.parallelValue) if subject.parallelValue.present?

            build_temporal_nodes(Array(subject.structuredValue).select { |node| node.type == 'time' })
          end
        ).uniq
      end

      private

      attr_reader :subjects

      def build_temporal_nodes(nodes)
        Array(nodes).flat_map { |node| build_temporal(node) }
      end

      # @param [Cocina::Models::DescriptiveValue]
      def build_temporal(node)
        remove_trailing_punctuation(
          Array(node.value) +
          Array(node.structuredValue).map(&:value) +
          Array(node.parallelValue).flat_map { |child| build_temporal(child) }
        )
      end

      def remove_trailing_punctuation(strings)
        strings.map { |str| str.sub(%r{[ ,\\/;]+$}, '') }
      end
    end
  end
end