ds and + sign if value greater than zero.
			$form['trends'] = sprintf( '%s%s%%', $form['trends'] >= 0 ? '+' : '', $form['trends'] );
		}

		return $input;
	}

	/**
	 * Check if trends can be displayed for the given entries.
	 *
	 * @since 1.8.8
	 *
	 * @param array $entries The entries data.
	 *
	 * @return bool
	 */
	private function entries_has_trends( array $entries ): bool {

		// Return false if entries array is empty.
		if ( empty( $entries ) ) {
			return false;
		}

		// Check if at least one array item has the 'trends' key.
		foreach ( $entries as $entry ) {
			if ( isset( $entry['trends'] ) ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Get icons URL.
	 * Primarily used in the HTML version of the email template.
	 *
	 * @since 1.8.8
	 *
	 * @return array
	 */
	private function get_icons_url(): array {

		$base_url = WPFORMS_PLUGIN_URL . 'assets/images/email/';

		return [
			'overview'           => $base_url . 'icon-overview.png',
			'upward'             => $base_url . 'icon-upward.png',
			'downward'           => $base_url . 'icon-downward.png',
			'notification_block' => $base_url . 'notification-block-icon.png',
			'info_block'         => $base_url . 'info-block-icon.png',
		];
	}
}