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import pull from 'lodash/pull';
export interface AlertInfo {
type?: 'primary' | 'secondary' | 'success' | 'danger' | 'warning' | 'info';
message: string;
}
export interface AlertInfoEx extends AlertInfo {
id: number;
}
export type AlertConsumer = (alerts: AlertInfoEx) => void;
export class AlertService {
private consumers: AlertConsumer[] = [];
private savedAlerts: AlertInfoEx[] = [];
private currentId = 1;
private produce(alert: AlertInfoEx): void {
for (const consumer of this.consumers) {
consumer(alert);
}
}
registerConsumer(consumer: AlertConsumer): void {
this.consumers.push(consumer);
if (this.savedAlerts.length !== 0) {
for (const alert of this.savedAlerts) {
this.produce(alert);
}
this.savedAlerts = [];
}
}
unregisterConsumer(consumer: AlertConsumer): void {
pull(this.consumers, consumer);
}
push(alert: AlertInfo): void {
const newAlert: AlertInfoEx = { ...alert, id: this.currentId++ };
if (this.consumers.length === 0) {
this.savedAlerts.push(newAlert);
} else {
this.produce(newAlert);
}
}
}
export const alertService = new AlertService();
export function pushAlert(alert: AlertInfo): void {
alertService.push(alert);
}
export const kAlertHostId = 'alert-host';
export function getAlertHost(): HTMLElement | null {
return document.getElementById(kAlertHostId);
}
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