/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { DOCUMENT } from '@angular/common';
import { Inject, Injectable, NgZone, Optional } from '@angular/core';
import { BaseOverlayDispatcher } from './base-overlay-dispatcher';
import * as i0 from "@angular/core";
/**
 * Service for dispatching keyboard events that land on the body to appropriate overlay ref,
 * if any. It maintains a list of attached overlays to determine best suited overlay based
 * on event target and order of overlay opens.
 */
export class OverlayKeyboardDispatcher extends BaseOverlayDispatcher {
    constructor(document, 
    /** @breaking-change 14.0.0 _ngZone will be required. */
    _ngZone) {
        super(document);
        this._ngZone = _ngZone;
        /** Keyboard event listener that will be attached to the body. */
        this._keydownListener = (event) => {
            const overlays = this._attachedOverlays;
            for (let i = overlays.length - 1; i > -1; i--) {
                // Dispatch the keydown event to the top overlay which has subscribers to its keydown events.
                // We want to target the most recent overlay, rather than trying to match where the event came
                // from, because some components might open an overlay, but keep focus on a trigger element
                // (e.g. for select and autocomplete). We skip overlays without keydown event subscriptions,
                // because we don't want overlays that don't handle keyboard events to block the ones below
                // them that do.
                if (overlays[i]._keydownEvents.observers.length > 0) {
                    const keydownEvents = overlays[i]._keydownEvents;
                    /** @breaking-change 14.0.0 _ngZone will be required. */
                    if (this._ngZone) {
                        this._ngZone.run(() => keydownEvents.next(event));
                    }
                    else {
                        keydownEvents.next(event);
                    }
                    break;
                }
            }
        };
    }
    /** Add a new overlay to the list of attached overlay refs. */
    add(overlayRef) {
        super.add(overlayRef);
        // Lazily start dispatcher once first overlay is added
        if (!this._isAttached) {
            /** @breaking-change 14.0.0 _ngZone will be required. */
            if (this._ngZone) {
                this._ngZone.runOutsideAngular(() => this._document.body.addEventListener('keydown', this._keydownListener));
            }
            else {
                this._document.body.addEventListener('keydown', this._keydownListener);
            }
            this._isAttached = true;
        }
    }
    /** Detaches the global keyboard event listener. */
    detach() {
        if (this._isAttached) {
            this._document.body.removeEventListener('keydown', this._keydownListener);
            this._isAttached = false;
        }
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: OverlayKeyboardDispatcher, deps: [{ token: DOCUMENT }, { token: i0.NgZone, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: OverlayKeyboardDispatcher, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: OverlayKeyboardDispatcher, decorators: [{
            type: Injectable,
            args: [{ providedIn: 'root' }]
        }], ctorParameters: function () { return [{ type: undefined, decorators: [{
                    type: Inject,
                    args: [DOCUMENT]
                }] }, { type: i0.NgZone, decorators: [{
                    type: Optional
                }] }]; } });
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