/**
 * Internal dependencies
 */
import type AttributeMap from './AttributeMap';

interface Op {
	// only one property out of {insert, delete, retain} will be present
	insert?: string | Record< string, unknown >;
	delete?: number;
	retain?: number | Record< string, unknown >;

	attributes?: AttributeMap;
}

namespace Op {
	export function length( op: Op ): number {
		if ( typeof op.delete === 'number' ) {
			return op.delete;
		} else if ( typeof op.retain === 'number' ) {
			return op.retain;
		} else if ( typeof op.retain === 'object' && op.retain !== null ) {
			return 1;
		}
		return typeof op.insert === 'string' ? op.insert.length : 1;
	}
}

export default Op;