# frozen_string_literal: true
# Gather information about the depositors who have contributed to the repository
module Hyrax
  module Statistics
    module Depositors
      class Summary
        include Blacklight::SearchHelper

        # @api public
        # @param [Time] start_date optionally specify the start date to gather the stats from
        # @param [Time] end_date optionally specify the end date to gather the stats from
        # @return [Array<Hash>] With keys of: :key, :deposits, and :user
        def self.depositors(start_date:, end_date:)
          new(start_date, end_date).depositors
        end

        # @param [Time] start_date optionally specify the start date to gather the stats from
        # @param [Time] end_date optionally specify the end date to gather the stats from
        def initialize(start_date, end_date)
          @start_dt = start_date
          @end_dt = end_date
        end

        attr_accessor :start_dt, :end_dt

        def depositors
          # step through the array by twos to get each pair
          results.map do |key, deposits|
            user = ::User.find_by_user_key(key)
            raise "Unable to find user '#{key}'\nResults was: #{results.inspect}" unless user
            { key: key, deposits: deposits, user: user }
          end
        end

        private

        delegate :blacklight_config, to: CatalogController
        delegate :depositor_field, to: DepositSearchBuilder

        # results come from Solr in an array where the first item is the user and
        # the second item is the count
        # [ abc123, 55, ccczzz, 205 ]
        # @return [#each] an enumerable object of tuples (user and count)
        def results
          facet_results = repository.search(query)
          facet_results.facet_fields[depositor_field].each_slice(2)
        end

        def search_builder
          DepositSearchBuilder.new([:include_depositor_facet, :filter_models], self)
        end

        def query
          search_builder.merge(q: date_query).query
        end

        def date_query
          query_service.build_date_query(start_dt, end_dt) if start_dt.present?
        end

        def query_service
          Hyrax::Statistics::QueryService.new
        end
      end
    end
  end
end