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import { ThemeColor, Text } from "../common";
export interface AlertInfo {
color?: ThemeColor;
message: Text;
dismissTime?: number | "never";
}
export interface AlertInfoWithId extends AlertInfo {
id: number;
}
interface AlertServiceAlert extends AlertInfoWithId {
timerId: number | null;
}
export type AlertsListener = (alerts: AlertInfoWithId[]) => void;
export class AlertService {
private listeners: AlertsListener[] = [];
private alerts: AlertServiceAlert[] = [];
private currentId = 1;
getAlert(alertId?: number | null | undefined): AlertServiceAlert | null {
for (const alert of this.alerts) {
if (alert.id === alertId) return alert;
}
return null;
}
registerListener(listener: AlertsListener): void {
this.listeners.push(listener);
listener(this.alerts);
}
unregisterListener(listener: AlertsListener): void {
this.listeners = this.listeners.filter((l) => l !== listener);
}
notify() {
for (const listener of this.listeners) {
listener(this.alerts);
}
}
push(alert: AlertInfo): void {
const newAlert: AlertServiceAlert = {
...alert,
id: this.currentId++,
timerId: null,
};
this.alerts.push(newAlert);
this._resetDismissTimer(newAlert);
this.notify();
}
private _dismiss(alert: AlertServiceAlert) {
if (alert.timerId != null) {
window.clearTimeout(alert.timerId);
}
this.alerts = this.alerts.filter((a) => a !== alert);
this.notify();
}
dismiss(alertId?: number | null | undefined) {
const alert = this.getAlert(alertId);
if (alert != null) {
this._dismiss(alert);
}
}
private _clearDismissTimer(alert: AlertServiceAlert) {
if (alert.timerId != null) {
window.clearTimeout(alert.timerId);
alert.timerId = null;
}
}
clearDismissTimer(alertId?: number | null | undefined) {
const alert = this.getAlert(alertId);
if (alert != null) {
this._clearDismissTimer(alert);
}
}
private _resetDismissTimer(
alert: AlertServiceAlert,
dismissTime?: number | null | undefined,
) {
this._clearDismissTimer(alert);
const realDismissTime = dismissTime ?? alert.dismissTime;
if (typeof realDismissTime === "number") {
alert.timerId = window.setTimeout(() => {
this._dismiss(alert);
}, realDismissTime);
}
}
resetDismissTimer(alertId?: number | null | undefined) {
const alert = this.getAlert(alertId);
if (alert != null) {
this._resetDismissTimer(alert);
}
}
}
export const alertService = new AlertService();
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