class Eco::API::UseCases::GraphQL::Samples::Location
  # Logic to: Create tags remap csv table batch design
  module Command::TrackChangedIds
    include Eco::API::UseCases::GraphQL::Helpers::Base::CaseEnv

    attr_accessor :tags_remap_csv_file

    REMAP_LOC_IDS_FOLDER   = 'cache'.freeze
    REMAP_LOC_IDS_FILENAME = 'remap_loc_ids.csv'.freeze

    def tags_remap_csv_full_filename
      folder   = self.class::REMAP_LOC_IDS_FOLDER
      filename = self.class::REMAP_LOC_IDS_FILENAME
      File.join(folder, filename)
    end

    def tags_remap_class
      Eco::API::UseCases::GraphQL::Helpers::Location::TagsRemap
    end

    # The maps of tags to be used in batch remap tags
    # @return [Array<Array>] source/destination pairs of `Array<String>`
    def tags_remap_table
      @tags_remap_table ||= tags_remap_class.new
    end

    # Generates the file
    # @note this method used to only work if we could run cummulative dry-runs to the back-end.
    #   However, after RS P3, as mappings are one-to-one (not many-to-many per row),
    #   we can just display the mappings in dry-run as well.
    def close_handling_tags_remap_csv
      if tags_remap_table.any?
        puts "REMAP LOC IDs CSV (content):"
        puts tags_remap_table
        true
      else
        log(:info) { "Remap location ids NOT needed :)" }
        false
      end
    end

    # Based on commands that succeded, and the batch stage, it tracks
    # the tag remaps that should be batches against existing pages
    # @note The only update operation that generate tag remaps
    #   is `:id` (or `:id_name`).
    # @return [Boolean] whether new maps were inserted to the tracking table
    def update_tags_remap_table(results, stage, ref_tree = nil)
      return false unless %i[id id_name].include?(stage)

      msg = "Expecting CommandResults object. Given: #{results.class}"
      raise msg unless results.is_a?(request_results_class)

      target = simulate?? results.results : results.applied

      target.each do |result|
        prev_id, new_id = result.command_input_data.values_at(:nodeId, :newId)
        next if new_id.nil? # not an id change
        next if prev_id == new_id

        tags_remap_table << [[prev_id], [new_id]]

        # next unless ref_tree.is_a?(Eco::API::Organization::TagTree)
        # next unless ref_tree.tag?(new_id)

        # msg  = "Node '#{prev_id}' was updated to '#{new_id}', "
        # msg << "but in current structure '#{new_id}' is not present"
        # log(:warn) { msg }
      end
    end

    # Generates the final tags remap file
    def generate_tags_remap_csv(filename = tags_remap_csv_full_filename)
      return nil if tags_remap_table.empty?

      timestamp_file(filename).tap do |file|
        CSV.open(file, 'w') do |csv|
          csv << %w[prev_node_ids new_node_ids]
          tags_remap_table.each do |tags_remap|
            csv << tags_remap.to_csv_row
          end
        end
        log(:info) { "Generated file '#{file}'" }
      end
    end

    # Makes the file relative to the enviro
    def timestamp_file(filename, enviro_relative: true)
      filename = session.file_manager.dir.file(filename) if enviro_relative
      Eco::Data::Files.timestamp_file(filename)
    end
  end
end