module Spotlight
  ##
  # ReindexProgress is a class that models the progress of reindexing a list of resources
  class ReindexProgress
    attr_reader :exhibit

    def initialize(exhibit)
      @exhibit = exhibit
    end

    def recently_in_progress?
      return false if current_log_entry.blank?
      return true if current_log_entry.in_progress?

      current_log_entry.end_time.present? && (current_log_entry.end_time > Spotlight::Engine.config.reindex_progress_window.minutes.ago)
    end

    def started_at
      current_log_entry.try(:start_time)
    end

    def updated_at
      current_log_entry.try(:updated_at)
    end

    def finished?
      return false if current_log_entry.blank?
      current_log_entry.succeeded? || current_log_entry.failed?
    end

    def finished_at
      current_log_entry.try(:end_time)
    end

    def total
      current_log_entry.try(:items_reindexed_estimate)
    end

    def completed
      current_log_entry.try(:items_reindexed_count)
    end

    def errored?
      return false if current_log_entry.blank?
      current_log_entry.failed?
    end

    def as_json(*)
      {
        recently_in_progress: recently_in_progress?,
        started_at: localized_start_time,
        finished_at: localized_finish_time,
        updated_at: localized_updated_time,
        total: total,
        completed: completed,
        errored: errored?
      }
    end

    private

    def current_log_entry
      exhibit.reindexing_log_entries.where.not(job_status: 'unstarted').first
    end

    def localized_start_time
      return unless started_at
      I18n.l(started_at, format: :short)
    end

    def localized_finish_time
      return unless finished_at
      I18n.l(finished_at, format: :short)
    end

    def localized_updated_time
      return unless updated_at
      I18n.l(updated_at, format: :short)
    end
  end
end