import type { QueryCorrection } from '../../../api/search/search/query-corrections.js';
import type { CoreEngine } from '../../../app/engine.js';
import { type Controller } from '../../controller/headless-controller.js';
export interface DidYouMeanProps {
    options?: DidYouMeanOptions;
}
type QueryCorrectionMode = 'legacy' | 'next';
export interface DidYouMeanOptions {
    /**
     * Whether to automatically apply corrections for queries that would otherwise return no results.
     * When `automaticallyCorrectQuery` is `true`, the controller automatically triggers a new query using the suggested term.
     * When `automaticallyCorrectQuery` is `false`, the controller returns the suggested term without triggering a new query.
     *
     * The default value is `true`.
     */
    automaticallyCorrectQuery?: boolean;
    /**
     * Define which query correction system to use
     *
     * `legacy`: Query correction is powered by the legacy index system. This system relies on an algorithm using solely the index content to compute the suggested terms.
     * `next`: Query correction is powered by a machine learning system, requiring a valid query suggestion model configured in your Coveo environment to function properly. This system relies on machine learning algorithms to compute the suggested terms.
     *
     * Default value is `next`.
     */
    queryCorrectionMode?: QueryCorrectionMode;
}
/**
 * The `DidYouMean` controller is responsible for handling query corrections.
 *
 *
 * @group Controllers
 * @category DidYouMean
 */
export interface DidYouMean extends Controller {
    /**
     * Apply query correction using the query correction, if any, currently present in the state.
     */
    applyCorrection(): void;
    /**
     * Update which query correction system to use
     *
     * `legacy`: Query correction is powered by the legacy index system. This system relies on an algorithm using solely the index content to compute the suggested terms.
     * `next`: Query correction is powered by a machine learning system, requiring a valid query suggestion model configured in your Coveo environment to function properly. This system relies on machine learning algorithms to compute the suggested terms.
     *
     *  @param queryCorrectionMode - the query correction mode to use
     *
     */
    updateQueryCorrectionMode(queryCorrectionMode: QueryCorrectionMode): void;
    /**
     * The state of the `DidYouMean` controller.
     */
    state: DidYouMeanState;
}
/**
 * A scoped and simplified part of the headless engine that is relevant to the `DidYouMean` controller.
 *
 * @group Controllers
 * @category DidYouMean
 */
export interface DidYouMeanState {
    /**
     * The correction that was applied to the query. If no correction was applied, will default to an empty string.
     */
    wasCorrectedTo: string;
    /**
     * The original query that was performed, without any automatic correction applied.
     */
    originalQuery: string;
    /**
     * Specifies if the query was automatically corrected by Headless.
     *
     * This happens when there is no result returned by the API for a particular misspelling.
     */
    wasAutomaticallyCorrected: boolean;
    /**
     * The query correction that is currently applied by the "did you mean" module.
     */
    queryCorrection: QueryCorrection;
    /**
     * Specifies if there is a query correction to apply.
     */
    hasQueryCorrection: boolean;
}
/**
 * The DidYouMean controller is responsible for handling query corrections.
 * When a query returns no result but finds a possible query correction, the controller either suggests the correction or
 * automatically triggers a new query with the suggested term.
 *
 * @param engine - The headless engine.
 * @param props - The configurable `DidYouMean` controller properties.
 * @returns A `DidYouMean` controller instance.
 *
 * @group Controllers
 * @category DidYouMean
 */
export declare function buildCoreDidYouMean(engine: CoreEngine, props?: DidYouMeanProps): DidYouMean;
export {};