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import { TranslatedString } from "@gnu-taler/taler-util";
import { useEffect, useState } from "preact/hooks";
import { memoryMap } from "../index.browser.js";
export type NotificationMessage = ErrorNotification | InfoNotification;
export interface ErrorNotification {
type: "error";
title: TranslatedString;
description?: TranslatedString;
debug?: string;
}
export interface InfoNotification {
type: "info";
title: TranslatedString;
}
const storage = memoryMap<Map<string, NotificationMessage>>();
const NOTIFICATION_KEY = "notification";
export function notify(notif: NotificationMessage): void {
const currentState: Map<string, NotificationMessage> =
storage.get(NOTIFICATION_KEY) ?? new Map();
const newState = currentState.set(hash(notif), notif);
storage.set(NOTIFICATION_KEY, newState);
}
export function notifyError(
title: TranslatedString,
description: TranslatedString | undefined,
debug?: any,
) {
notify({
type: "error" as const,
title,
description,
debug,
});
}
export function notifyInfo(title: TranslatedString) {
notify({
type: "info" as const,
title,
});
}
type Notification = {
message: NotificationMessage;
remove: () => void;
};
export function useNotifications(): Notification[] {
const [value, setter] = useState<Map<string, NotificationMessage>>(new Map());
useEffect(() => {
return storage.onUpdate(NOTIFICATION_KEY, () => {
const mem = storage.get(NOTIFICATION_KEY) ?? new Map();
setter(structuredClone(mem));
});
});
return Array.from(value.values()).map((message, idx) => {
return {
message,
remove: () => {
const mem = storage.get(NOTIFICATION_KEY) ?? new Map();
const newState = new Map(mem);
newState.delete(hash(message));
storage.set(NOTIFICATION_KEY, newState);
},
};
});
}
function hashCode(str: string): string {
if (str.length === 0) return "0";
let hash = 0;
let chr;
for (let i = 0; i < str.length; i++) {
chr = str.charCodeAt(i);
hash = (hash << 5) - hash + chr;
hash |= 0; // Convert to 32bit integer
}
return hash.toString(16);
}
function hash(msg: NotificationMessage): string {
let str = (msg.type + ":" + msg.title) as string;
if (msg.type === "error") {
if (msg.description) {
str += ":" + msg.description;
}
if (msg.debug) {
str += ":" + msg.debug;
}
}
return hashCode(str);
}
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