import { InjectionToken, Directive, Input, EventEmitter, Optional, Inject, SkipSelf, ChangeDetectorRef, Output, NgModule } from '@angular/core';
import { UniqueSelectionDispatcher } from '@angular/cdk/collections';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { Subject, Subscription } from 'rxjs';

/**
 * @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
 */
/** Used to generate unique ID for each accordion. */
let nextId$1 = 0;
/**
 * Injection token that can be used to reference instances of `CdkAccordion`. It serves
 * as alternative token to the actual `CdkAccordion` class which could cause unnecessary
 * retention of the class and its directive metadata.
 */
const CDK_ACCORDION = new InjectionToken('CdkAccordion');
/**
 * Directive whose purpose is to manage the expanded state of CdkAccordionItem children.
 */
class CdkAccordion {
    constructor() {
        /** Emits when the state of the accordion changes */
        this._stateChanges = new Subject();
        /** Stream that emits true/false when openAll/closeAll is triggered. */
        this._openCloseAllActions = new Subject();
        /** A readonly id value to use for unique selection coordination. */
        this.id = `cdk-accordion-${nextId$1++}`;
        this._multi = false;
    }
    /** Whether the accordion should allow multiple expanded accordion items simultaneously. */
    get multi() { return this._multi; }
    set multi(multi) { this._multi = coerceBooleanProperty(multi); }
    /** Opens all enabled accordion items in an accordion where multi is enabled. */
    openAll() {
        if (this._multi) {
            this._openCloseAllActions.next(true);
        }
    }
    /** Closes all enabled accordion items in an accordion where multi is enabled. */
    closeAll() {
        this._openCloseAllActions.next(false);
    }
    ngOnChanges(changes) {
        this._stateChanges.next(changes);
    }
    ngOnDestroy() {
        this._stateChanges.complete();
        this._openCloseAllActions.complete();
    }
}
CdkAccordion.decorators = [
    { type: Directive, args: [{
                selector: 'cdk-accordion, [cdkAccordion]',
                exportAs: 'cdkAccordion',
                providers: [{ provide: CDK_ACCORDION, useExisting: CdkAccordion }],
            },] }
];
CdkAccordion.propDecorators = {
    multi: [{ type: Input }]
};

/**
 * @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
 */
/** Used to generate unique ID for each accordion item. */
let nextId = 0;
const ɵ0 = undefined;
/**
 * An basic directive expected to be extended and decorated as a component.  Sets up all
 * events and attributes needed to be managed by a CdkAccordion parent.
 */
class CdkAccordionItem {
    constructor(accordion, _changeDetectorRef, _expansionDispatcher) {
        this.accordion = accordion;
        this._changeDetectorRef = _changeDetectorRef;
        this._expansionDispatcher = _expansionDispatcher;
        /** Subscription to openAll/closeAll events. */
        this._openCloseAllSubscription = Subscription.EMPTY;
        /** Event emitted every time the AccordionItem is closed. */
        this.closed = new EventEmitter();
        /** Event emitted every time the AccordionItem is opened. */
        this.opened = new EventEmitter();
        /** Event emitted when the AccordionItem is destroyed. */
        this.destroyed = new EventEmitter();
        /**
         * Emits whenever the expanded state of the accordion changes.
         * Primarily used to facilitate two-way binding.
         * @docs-private
         */
        this.expandedChange = new EventEmitter();
        /** The unique AccordionItem id. */
        this.id = `cdk-accordion-child-${nextId++}`;
        this._expanded = false;
        this._disabled = false;
        /** Unregister function for _expansionDispatcher. */
        this._removeUniqueSelectionListener = () => { };
        this._removeUniqueSelectionListener =
            _expansionDispatcher.listen((id, accordionId) => {
                if (this.accordion && !this.accordion.multi &&
                    this.accordion.id === accordionId && this.id !== id) {
                    this.expanded = false;
                }
            });
        // When an accordion item is hosted in an accordion, subscribe to open/close events.
        if (this.accordion) {
            this._openCloseAllSubscription = this._subscribeToOpenCloseAllActions();
        }
    }
    /** Whether the AccordionItem is expanded. */
    get expanded() { return this._expanded; }
    set expanded(expanded) {
        expanded = coerceBooleanProperty(expanded);
        // Only emit events and update the internal value if the value changes.
        if (this._expanded !== expanded) {
            this._expanded = expanded;
            this.expandedChange.emit(expanded);
            if (expanded) {
                this.opened.emit();
                /**
                 * In the unique selection dispatcher, the id parameter is the id of the CdkAccordionItem,
                 * the name value is the id of the accordion.
                 */
                const accordionId = this.accordion ? this.accordion.id : this.id;
                this._expansionDispatcher.notify(this.id, accordionId);
            }
            else {
                this.closed.emit();
            }
            // Ensures that the animation will run when the value is set outside of an `@Input`.
            // This includes cases like the open, close and toggle methods.
            this._changeDetectorRef.markForCheck();
        }
    }
    /** Whether the AccordionItem is disabled. */
    get disabled() { return this._disabled; }
    set disabled(disabled) { this._disabled = coerceBooleanProperty(disabled); }
    /** Emits an event for the accordion item being destroyed. */
    ngOnDestroy() {
        this.opened.complete();
        this.closed.complete();
        this.destroyed.emit();
        this.destroyed.complete();
        this._removeUniqueSelectionListener();
        this._openCloseAllSubscription.unsubscribe();
    }
    /** Toggles the expanded state of the accordion item. */
    toggle() {
        if (!this.disabled) {
            this.expanded = !this.expanded;
        }
    }
    /** Sets the expanded state of the accordion item to false. */
    close() {
        if (!this.disabled) {
            this.expanded = false;
        }
    }
    /** Sets the expanded state of the accordion item to true. */
    open() {
        if (!this.disabled) {
            this.expanded = true;
        }
    }
    _subscribeToOpenCloseAllActions() {
        return this.accordion._openCloseAllActions.subscribe(expanded => {
            // Only change expanded state if item is enabled
            if (!this.disabled) {
                this.expanded = expanded;
            }
        });
    }
}
CdkAccordionItem.decorators = [
    { type: Directive, args: [{
                selector: 'cdk-accordion-item, [cdkAccordionItem]',
                exportAs: 'cdkAccordionItem',
                providers: [
                    // Provide `CDK_ACCORDION` as undefined to prevent nested accordion items from
                    // registering to the same accordion.
                    { provide: CDK_ACCORDION, useValue: ɵ0 },
                ],
            },] }
];
CdkAccordionItem.ctorParameters = () => [
    { type: CdkAccordion, decorators: [{ type: Optional }, { type: Inject, args: [CDK_ACCORDION,] }, { type: SkipSelf }] },
    { type: ChangeDetectorRef },
    { type: UniqueSelectionDispatcher }
];
CdkAccordionItem.propDecorators = {
    closed: [{ type: Output }],
    opened: [{ type: Output }],
    destroyed: [{ type: Output }],
    expandedChange: [{ type: Output }],
    expanded: [{ type: Input }],
    disabled: [{ type: Input }]
};

/**
 * @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
 */
class CdkAccordionModule {
}
CdkAccordionModule.decorators = [
    { type: NgModule, args: [{
                exports: [CdkAccordion, CdkAccordionItem],
                declarations: [CdkAccordion, CdkAccordionItem],
            },] }
];

/**
 * @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
 */

/**
 * Generated bundle index. Do not edit.
 */

export { CdkAccordion, CdkAccordionItem, CdkAccordionModule, CDK_ACCORDION as ɵangular_material_src_cdk_accordion_accordion_a };
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