stringer-rss/stringer

# frozen_string_literal: true

module FeverAPI::ReadItems
  class << self
    def call(authorization:, **params)
      return {} unless params.key?(:items)

      item_ids = params[:with_ids].split(",") if params.key?(:with_ids)

      {
        items: items(item_ids, params[:since_id], authorization),
        total_items: total_items(item_ids, authorization)
      }
    end

    private

    def items(item_ids, since_id, authorization)
      items =
        if item_ids
          stories_by_ids(item_ids, authorization)
        else
          unread_stories(since_id, authorization)
        end
      items.order(:published, :id).map(&:as_fever_json)
    end

    def total_items(item_ids, authorization)
      items =
        if item_ids
          stories_by_ids(item_ids, authorization)
        else
          unread_stories(nil, authorization)
        end
      items.count
    end

    def stories_by_ids(ids, authorization)
      authorization.scope(StoryRepository.fetch_by_ids(ids))
    end

    def unread_stories(since_id, authorization)
      if since_id.present?
        authorization.scope(StoryRepository.unread_since_id(since_id))
      else
        authorization.scope(StoryRepository.unread)
      end
    end
  end
end