lib/press_recovery.rb

# frozen_string_literal: true

require_relative "press_results"

class PressRecovery
  def initialize(stations:)
    @stations = stations.dup.freeze
  end

  def assess(positions)
    positions.filter_map { |snapshot| assess_position(snapshot) }.freeze
  end

  private

  def assess_position(snapshot)
    return nil unless snapshot.work

    missing = missing_before(snapshot)
    PositionAssessment.new(station: snapshot.station.name,
                           disposition: disposition_for(missing),
                           missing: missing)
  end

  def missing_before(snapshot)
    index = @stations.index(snapshot.station)
    @stations[0...index].map(&:fact).reject { |fact| snapshot.work.fact?(fact) }
  end

  def disposition_for(missing)
    missing.empty? ? :resume : :quarantine
  end
end