# Copyright (C) 2012-2023 Zammad Foundation, https://zammad-foundation.org/

module Sequencer::Unit::Import::Zendesk::SubSequence::Mapped
  module ClassMethods

    def resource_map
      :"#{resource_klass.underscore}_map"
    end

    def inherited(base)
      super

      base.provides(base.resource_map)

      base.extend(Forwardable)
      base.instance_delegate [:resource_map] => base
    end
  end

  def self.included(base)
    base.uses :client

    base.extend(ClassMethods)
  end

  def process
    state.provide(resource_map) do
      process_sub_sequence
      mapping
    end
  end

  private

  def expecting
    raise 'Missing implementation of expecting method'
  end

  def collection_provider
    client
  end

  def process_sub_sequence
    resource_iteration do |resource|

      expected_value = expected(resource)

      next if expected_value.blank?

      mapping[resource.id] = mapping_value(expected_value)
    end
  end

  def expected(resource)
    result = sub_sequence(resource)
    result[expecting]
  end

  def sub_sequence(resource)
    ::Sequencer.process(sequence_name,
                        parameters: default_params.merge(
                          resource: resource
                        ),
                        expecting:  [expecting])
  end

  def mapping_value(expected_value)
    expected_value
  end

  def mapping
    @mapping ||= {}
  end
end