module Eco::API::UseCases::GraphQL::Samples
  module Location::Service
    # Service to spot the differences between an input file and a locations tree.
    # @example
    #    class Custom::UseCase::TagtreeDiff < Eco::API::UseCases::GraphQL::Samples::Location
    #      name 'tagtree-diff'
    #      type :other

    #      require_relative 'cli/10_tagtree_diff_cli'

    #      include Eco::API::UseCases::GraphQL::Samples::Location::Service::TreeDiff

    #      IN_FILENAME  = /requested_tree\.csv/.freeze
    #      IN_FOLDER    = 'sftp'.freeze
    #      HEADER_MAPS  = {
    #        'Code'             => 'id',
    #        'Description'      => 'name',
    #        'ParentCode'       => 'parent_id',
    #        'IsActive'         => 'active',
    #        'LevelDescription' => 'classifications'
    #      }.freeze
    #      CLASSIFICATION_MAPS = {
    #        'Directorate' => 'agency',
    #        'Subsection'  => 'sub-section',
    #        'WorkUnit'    => 'work-unit'
    #      }.freeze
    #
    #   def process
    #     compare
    #   end
    #
    #   private
    #
    #   def custom_input_csv_transform(csv)
    #     csv.add_column('archived')
    #   end
    #
    #   def custom_input_row_transform(row)
    #     row['archived'] = !as_boolean(row['active'])
    #   end
    # end
    module TreeDiff
      include Eco::API::UseCases::GraphQL::Samples::Location::Service::TreeToList

      require_relative 'tree_diff/convertible'
      include Convertible

      def process
        compare
      end

      def compare
        comparer.tap do |cmp|
          puts comparer.diffs_details if print_diff_details? && cmp.diffs?
          log(:info) { cmp.diffs_summary }
          sleep(5)
        end
      end

      def comparer(source_1 = live_nodes_list, source_2 = file_nodes_list)
        @comparer ||= nodes_diff_class.new(
          source_1,
          source_2,
          original_tree: input_tagtree,
          logger:        logger
        ).tap do
          log(:info) {
            "Comparing #{source_1.count} nodes with #{source_2.count} file nodes."
          }
        end
      end

      private

      def nodes_diff_class
        Eco::Data::Locations::NodeDiff::NodesDiff
      end

      def print_diff_details?
        true
      end

      def generate_live_nodes_file?
        false
      end

      def live_nodes_list
        @live_nodes_list ||= as_nodes_json(input_tagtree).tap do |list|
          log(:info) { "Converted live tree to list of #{list.count} hash-nodes" }
        end
      end

      # We accept csv input as a `:tree` or as `:nodes`
      # @note
      #   1. uses custom converter inherited from base case '01_tatree_to_list_case'
      #     - `as_nodes_json`
      #   2. `org_tree` is native from `Eco::Data::Locations::NodeBase::CsvConvert`
      def file_nodes_list
        @file_nodes_list ||= as_nodes_json(org_tree(input_csv)).tap do |list|
          log(:info) { "Converted input csv file to list of #{list.count} hash-nodes" }
        end
      end
    end
  end
end