1 files changed, 67 insertions, 0 deletions
diff --git a/packages/web-util/src/hooks/useNotifications.ts b/packages/web-util/src/hooks/useNotifications.ts
new file mode 100644
index 000000000..deaa7a7c1
--- /dev/null
+++ b/packages/web-util/src/hooks/useNotifications.ts
@@ -0,0 +1,67 @@
+import { TranslatedString } from "@gnu-taler/taler-util";
+import { StateUpdater, useEffect, useState } from "preact/hooks";
+import { memoryMap } from "../index.browser.js";
+
+export type NotificationMessage = ErrorNotification | InfoNotification;
+
+interface ErrorNotification {
+  type: "error";
+  title: TranslatedString;
+  description?: TranslatedString;
+  debug?: string;
+}
+interface InfoNotification {
+  type: "info";
+  title: TranslatedString;
+}
+
+const storage = memoryMap<NotificationMessage[]>();
+const NOTIFICATION_KEY = "notification";
+
+export function notifyError(
+  title: TranslatedString,
+  description: TranslatedString | undefined,
+  debug?: any,
+) {
+  const currentState: NotificationMessage[] =
+    storage.get(NOTIFICATION_KEY) ?? [];
+  const newState = currentState.concat({
+    type: "error",
+    title,
+    description,
+    debug,
+  });
+  storage.set(NOTIFICATION_KEY, newState);
+}
+export function notifyInfo(title: TranslatedString) {
+  const currentState: NotificationMessage[] =
+    storage.get(NOTIFICATION_KEY) ?? [];
+  const newState = currentState.concat({ type: "info", title });
+  storage.set(NOTIFICATION_KEY, newState);
+}
+
+type Notification = {
+  message: NotificationMessage;
+  remove: () => void;
+};
+
+export function useNotifications(): Notification[] {
+  const [value, setter] = useState<NotificationMessage[]>([]);
+  useEffect(() => {
+    return storage.onUpdate(NOTIFICATION_KEY, () => {
+      const mem = storage.get(NOTIFICATION_KEY) ?? [];
+      setter(mem);
+    });
+  });
+  return value.map((message, idx) => {
+    return {
+      message,
+      remove: () => {
+        const mem = storage.get(NOTIFICATION_KEY) ?? [];
+        const newState = Array.from(mem);
+        newState.splice(idx, 1);
+        storage.set(NOTIFICATION_KEY, newState);
+      },
+    };
+  });
+}