import { Condition } from '../conditions/index.js';
import { DynamoEntity } from '../core/entity.js';
import { ObjectLikeZodType, EntitySchema, TransactWriteOperation } from '../core/index.js';
import { ReturnValuesOnConditionCheckFailure } from '@aws-sdk/client-dynamodb';
import { WriteTransactable } from './index.js';

/**
 * Configuration for the ConditionCheck command.
 *
 * @template Schema - The Zod schema defining the structure of the entity.
 */
type ConditionCheckConfig<Schema extends ObjectLikeZodType> = {
    key: Partial<EntitySchema<Schema>>;
    condition: Condition;
    returnValuesOnConditionCheckFailure?: ReturnValuesOnConditionCheckFailure;
};
/**
 * Command to verify a condition without modifying data in a transaction.
 *
 * @template Schema - The Zod schema defining the structure of the entity.
 *
 * @example
 * ```typescript
 * import { DynamoTable, DynamoEntity, key, TransactWrite, ConditionCheck, Update } from 'dynamo-document-builder';
 *
 * const table = new DynamoTable({
 *   tableName: 'ExampleTable',
 *   documentClient,
 * });
 *
 * const userEntity = new DynamoEntity({
 *   table,
 *   schema: z.object({
 *     userId: z.string(),
 *     balance: z.number(),
 *   }),
 *   partitionKey: user => key('USER', user.userId),
 *   sortKey: () => 'METADATA',
 * });
 *
 * const transactWriteCommand = new TransactWrite({
 *   writes: [
 *     new ConditionCheck({
 *       key: { userId: 'user1' },
 *       condition: { balance: greaterThan(100) },
 *     }),
 *     new Update({ key: { userId: 'user2' }, update: { balance: add(50) } }),
 *   ],
 * });
 *
 * await userEntity.send(transactWriteCommand);
 * ```
 */
declare class ConditionCheck<Schema extends ObjectLikeZodType> implements WriteTransactable<Schema> {
    #private;
    constructor(config: ConditionCheckConfig<Schema>);
    prepareWriteTransaction(entity: DynamoEntity<Schema>): Promise<TransactWriteOperation>;
}

export { ConditionCheck };
export type { ConditionCheckConfig };