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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { Overlay, OverlayRef } from '@angular/cdk/overlay';
import { ComponentPortal } from '@angular/cdk/portal';
import { isPlatformBrowser } from '@angular/common';
import { ComponentRef, inject, Injectable, Injector, OnDestroy, PLATFORM_ID } from '@angular/core';
import { Link } from '@siemens/element-ng/link';
import { SiNoTranslateService, SiTranslateService } from '@siemens/element-translate-ng/translate';
import { ReplaySubject, Subject } from 'rxjs';
import { SiToastNotificationDrawerComponent } from './si-toast-notification-drawer/si-toast-notification-drawer.component';
import { SI_TOAST_AUTO_HIDE_DELAY, SiToast, ToastStateName } from './si-toast.model';
@Injectable({ providedIn: 'root' })
export class SiToastNotificationService implements OnDestroy {
/**
* List of currently active toasts to see details or close them.
*
* @defaultValue []
*/
activeToasts: SiToast[] = [];
private activeToastsSubject = new ReplaySubject<SiToast[]>(1);
private queuedToastSubject = new Subject<SiToast>();
private readonly maxToasts = 3;
private componentRef?: ComponentRef<SiToastNotificationDrawerComponent>;
private overlayRef?: OverlayRef;
private injector = inject(Injector);
private overlay = inject(Overlay);
private toastTimeoutMap = new Map<SiToast, any>();
private toastTimerDefaults = new Map<
SiToast,
{ pendingTimeout: number; initializeTime: number }
>();
constructor() {
const isBrowser = isPlatformBrowser(inject(PLATFORM_ID));
this.queuedToastSubject.subscribe((toast: SiToast) => {
this.activeToasts.push(toast);
if (this.activeToasts.length > this.maxToasts) {
this.hideToastNotification(this.activeToasts[0]);
}
this.activeToastsSubject.next(this.activeToasts);
if (!toast.disableAutoClose && toast.timeout) {
this.toastTimerDefaults.set(toast, {
pendingTimeout: toast.timeout,
initializeTime: Date.now()
});
this.toastTimeoutMap.set(
toast,
setTimeout(() => this.hideToastNotification(toast), toast.timeout)
);
}
});
if (isBrowser) {
this.addToastDrawer();
}
}
ngOnDestroy(): void {
this.overlayRef?.dispose();
this.componentRef?.destroy();
}
/**
* Queue a new toast to be shown.
* @param action - Passing a Link object will optionally add a clickable link to the toast which can contain an action.
* @returns the toast object
*/
queueToastNotification(
state: ToastStateName,
title: string,
message: string,
disableAutoClose?: boolean,
disableManualClose?: boolean,
action?: Link
): SiToast {
const toast: SiToast = {
state,
title,
message,
disableAutoClose,
disableManualClose,
action,
hidden: new Subject()
};
return this.showToastNotification(toast);
}
/**
* Show a toast notification
* @param toast - The toast object of the toast to be shown, can also be constructed while calling this.
*/
showToastNotification(toast: SiToast): SiToast {
toast.timeout ??= SI_TOAST_AUTO_HIDE_DELAY;
toast.hidden ??= new Subject();
toast.close = () => this.hideToastNotification(toast);
this.queuedToastSubject.next(toast);
return toast;
}
/**
* Hide a toast notification
* @param toast - The toast object of the toast to be hidden, can be retrieved from {@link activeToasts} and is returned by {@link queueToastNotification}.
*/
hideToastNotification(toast?: SiToast): void {
const hiddenToasts: SiToast[] = [];
const activeToasts: SiToast[] = [];
this.activeToasts.forEach(item => {
if (!toast || item === toast) {
hiddenToasts.push(item);
} else {
activeToasts.push(item);
}
});
this.activeToasts = activeToasts;
this.activeToastsSubject.next(this.activeToasts);
hiddenToasts.forEach(item => {
item.hidden?.next();
item.hidden?.complete();
this.toastTimerDefaults.delete(item);
this.toastTimeoutMap.delete(item);
});
}
private pauseToastNotification(toast: SiToast): void {
Iif (!toast.disableAutoClose) {
clearTimeout(this.toastTimeoutMap.get(toast));
const initialTimeout = this.toastTimerDefaults.get(toast)?.initializeTime;
const elapsedTime = initialTimeout ? Date.now() - initialTimeout : 0;
this.toastTimerDefaults.get(toast)!.pendingTimeout -= elapsedTime;
}
}
private resumeToastNotification(toast: SiToast): void {
Iif (!toast.disableAutoClose) {
this.toastTimerDefaults.get(toast)!.initializeTime = Date.now();
this.toastTimeoutMap.set(
toast,
setTimeout(() => {
this.hideToastNotification(this.activeToasts.find(t => t === toast));
}, this.toastTimerDefaults.get(toast)!.pendingTimeout)
);
}
}
private addToastDrawer(): void {
this.overlayRef = this.overlay.create({
positionStrategy: this.overlay.position().global().end('20px').bottom()
});
const portal = new ComponentPortal(
SiToastNotificationDrawerComponent,
null,
this.buildInjector()
);
this.componentRef = this.overlayRef.attach(portal);
this.componentRef.setInput('toasts', this.activeToastsSubject);
this.componentRef.instance.paused.subscribe(toast => {
this.pauseToastNotification(toast);
});
this.componentRef.instance.resumed.subscribe(toast => {
this.resumeToastNotification(toast);
});
}
// TODO remove once translation must be defined at application start
// Notification service is provided in 'root'. If no translation is defined, SiNoTranslateService is not provided
private buildInjector(): Injector {
let injector = this.injector;
if (!injector.get(SiTranslateService, null)) {
injector = Injector.create({
providers: [{ provide: SiTranslateService, useClass: SiNoTranslateService, deps: [] }],
parent: this.injector
});
}
return injector;
}
}
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