import Component from '@ember/component';
import { IPowerSelectAPI } from 'nacho-search';
/**
 * The nacho-pwr-lookup is a small, no frills component that helps with simple search tasks such as a typeahead
 * lookup inside a table, where we need something simple instead of a fullblown search experience. We wrap around
 * ember-power-select with a basic interface, but the actual act of searching / handling results should be delegated
 * to the container component, or an extended one
 * @example
 * {{nacho-pwr-lookup
 *   suggestionLimit=number
 *   searchPlaceholder=stringIsOptional
 *   searchResolver=functionOrActionInterfaceDefinedInClass
 *   confirmResult=functionOrActionInterfaceDefinedInClass
 * }}
 */
export default class NachoPwrLookup extends Component {
    layout: any;
    /**
     * External parameter to determine how many results we should show per typeahead lookup
     * @type {number}
     * @default 10
     */
    suggestionLimit: number;
    /**
     * External parameter to render a string as the placeholder for the search input
     * @type {string}
     * @default ""
     */
    searchPlaceholder: string;
    /**
     * External action passed in as a handler required to perform the lookahead search for the power select
     * component. Function definition is based on ember-power-select requirements. Most common use case of
     * searchResolver would be in the body to async fetch results, then return asyncResultsCallback(results);
     * @example
     * searchResolver(query, scb, asyncResults) {
     *   const ldapRegex = new RegExp(`^${userNameQuery}.*`, 'i');
     *   const { userEntitiesSource = [] } = await getUserEntities();
     *   asyncResults(userEntitiesSource.filter(entity => ldapRegex.test(entity)));
     * }
     */
    searchResolver: (query: string, syncResultsCallback: (results: Array<string>) => void, asyncResultsCallback: (results: Array<string>) => void) => Promise<void>;
    /**
     * External action passed in as a handler required to confirm the result upon user action.
     * @example
     * confirmResult(userName) {
     *   if (!userName) return;
     *   const findUser = parentComponent.findUser;
     *   const userEntity = await findUser(userName);
     *   if (userEntity) ... do something;
     * }
     */
    confirmResult: (result: string) => Promise<void>;
    /**
     * The currently selected entity from the dropdown by the user
     * @type {string}
     */
    selectedEntity: string;
    /**
     * In a separate vein than the actual typeahead, this property helps us create an "autocomplete"
     * suggestion for the user based on their input
     * @type {string}
     */
    suggestedText: string;
    /**
     * Suggestion options to be rendered in the dropdown for the typeahead
     * @type {Array<string>}
     */
    suggestionOptions: Array<string>;
    /**
     * Whether or not we want to show the placeholder text in the typeahead box. When the user focuses in,
     * we want to remove both the placeholder text and the "+" icon in the box
     * @type {boolean}
     */
    showPlaceholder: boolean;
    /**
     * When the user focuses in on our component, we want to remove the placeholder text and the "+" icon in
     * the typeahead box.
     */
    focusIn(): void;
    /**
     * This hook is used to ensure overall component behavior is consistent with power-select behavior. Since
     * the power select typeahead is cleared when input loses focus, we use this to clear our autosuggest
     */
    focusOut(): void;
    /**
     * Overwrites the basic highlight function inside the ember-power-select component (which the typeahead
     * is a wrapper around) and allows us to ensure that the first option is selected everytime a new search
     * was triggered by user input
     * @param params - api object provided by ember-power-select component into this closure method
     */
    highlight(params: IPowerSelectAPI<string>): string | string[];
    constructor();
    /**
     * On change of user input, conducts a search to find the corresponding typeahead suggestions list
     * @param keyword - keyword entered by user passed from the power-select component
     */
    onSearch(keyword: string): void;
    /**
     * Action that gets called from user keystroke event. The side effects of this action take place before
     * the event is propogated to and handled by the power select component itself. This calculates whether
     * the user has entered an arrow up or arrow down key and if so, changes the autocomplete text to the
     * next value that will be highlighted based on the list position
     * @param params - api object provided by the ember power select component
     * @param keyboardEvent - event object created by the keypress
     */
    onKeyPress(params: IPowerSelectAPI<string>, keyboardEvent: KeyboardEvent): boolean;
    /**
     * Triggered when the user presses enter in the typeahead or clicks on a name in the typeahead suggestion
     * list, will trigger the external handler to do something with the chosen result
     * @param selection - selected option in the dropdown list
     */
    onChangeSelection(selection: string): void;
}