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);
      },
    };
  });
}