module Workarea
  module Exporting
    class GoogleFeed
      include Sidekiq::Worker
      include I18n::DefaultUrlOptions
      include Storefront::Engine.routes.url_helpers

      cattr_accessor :execution_block_size, :temp_file
      self.execution_block_size = 100
      self.temp_file = 'tmp/export/google_feed.txt'

      sidekiq_options queue: 'low'

      def perform(*args)
        generate_csv
        save_google_feed
      end

      def generate_csv
        ensure_directory

        @feed = CSV.open(GoogleFeed.temp_file, 'w', col_sep: "\t")
        write_header
        write_google_feed

      ensure
        @feed.close if defined?(@feed)
      end

      private

        def ensure_directory
          directory = File.dirname(GoogleFeed.temp_file)
          FileUtils.mkdir_p(directory)
        end

        def write_header
          @feed << Storefront::GoogleProductFeedViewModel.fields
        end

        def write_google_feed
          Catalog::Product.all.each_by(GoogleFeed.execution_block_size) do |p|
            product = Storefront::GoogleProductFeedViewModel.wrap(p)

            product.variants.each do |sku|
              next unless item_valid(product, sku)
              @feed << values_array(product, sku)
            end
          end
        end

        def save_google_feed
          google_feed = Feed::Google.find_first_or_initialize
          google_feed.feed = @feed
          google_feed.save!
        end

        def host
          Workarea.config.host
        end

        def item_valid(product, sku)
          sku.active? &&
            sku.displayable? &&
            product.active? &&
            product.sku_price(sku.sku).present? &&
            product.sku_price(sku.sku) > 0
        end

        def values_array(product, sku)
          [
            product.id,
            sku.sku,
            product.name,
            product.meta_description,
            product_url(product, host: host, sku: sku.sku),
            product.image,
            sku.status,
            sku.condition,
            product.brand,
            sku.color,
            sku.size,
            product.category_name,
            product.product_type,
            product.sku_price(sku.sku)
          ] + GoogleProductFeed.static_feed_values.values
        end
    end
  end
end