module ActsAsTaggableOn::Taggable::TaggedWithQuery
  class AnyTagsQuery < QueryBase
    def build
      taggable_model.where(model_has_at_least_one_tag)
                    .order(Arel.sql(order_conditions))
                    .readonly(false)
    end

    private

    def model_has_at_least_one_tag
      tagging_arel_table.project(Arel.star).where(at_least_one_tag).exists
    end

    def at_least_one_tag
      exists_contition = tagging_arel_table[:taggable_id].eq(taggable_arel_table[taggable_model.primary_key])
                          .and(tagging_arel_table[:taggable_type].eq(taggable_model.base_class.name))
                          .and(
                            tagging_arel_table[:tag_id].in(
                              tag_arel_table.project(tag_arel_table[:id]).where(tags_match_type)
                            )
                          )

      if options[:start_at].present?
        exists_contition = exists_contition.and(tagging_arel_table[:created_at].gteq(options[:start_at]))
      end

      if options[:end_at].present?
        exists_contition = exists_contition.and(tagging_arel_table[:created_at].lteq(options[:end_at]))
      end

      if options[:on].present?
        exists_contition = exists_contition.and(tagging_arel_table[:context].eq(options[:on]))
      end

      if (owner = options[:owned_by]).present?
        exists_contition = exists_contition.and(tagging_arel_table[:tagger_id].eq(owner.id))
                                   .and(tagging_arel_table[:tagger_type].eq(owner.class.base_class.to_s))
      end

      exists_contition
    end

    def order_conditions
      order_by = []
      if options[:order_by_matching_tag_count].present?
        order_by << "(SELECT count(*) FROM #{tagging_model.table_name} WHERE #{at_least_one_tag.to_sql}) desc"
      end

      order_by << options[:order] if options[:order].present?
      order_by.join(', ')
    end

    def alias_name(tag_list)
      alias_base_name = taggable_model.base_class.name.downcase
      taggings_context = options[:on] ? "_#{options[:on]}" : ''

      taggings_alias = adjust_taggings_alias(
          "#{alias_base_name[0..4]}#{taggings_context[0..6]}_taggings_#{ActsAsTaggableOn::Utils.sha_prefix(tag_list.join('_'))}"
       )

      taggings_alias
    end
  end
end