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+/*
+ This file is part of GNU Taler
+ (C) 2021-2023 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ *
+ * @author Sebastian Javier Marchano (sebasjm)
+ */
+
+import { useState } from "preact/hooks";
+
+/**
+ * This component is used when a component wants one child to have a trigger for
+ * an action (a button) and other child have the action implemented (like
+ * gathering information with a form). The difference with other approaches is
+ * that in this case the parent component is not holding the state.
+ *
+ * It will return a subscriber and activator.
+ *
+ * The activator may be undefined, if it is undefined it is indicating that the
+ * subscriber is not ready to be called.
+ *
+ * The subscriber will receive a function (the listener) that will be call when the
+ * activator runs. The listener must return the collected information.
+ *
+ * As a result, when the activator is triggered by a child component, the
+ * @action function is called receives the information from the listener defined by other
+ * child component
+ *
+ * @param action from <T> to <R>
+ * @returns activator and subscriber, undefined activator means that there is not subscriber
+ */
+
+export function useListener<T, R = any>(
+ action: (r: T) => Promise<R>,
+): [undefined | (() => Promise<R>), (listener?: () => T) => void] {
+ type RunnerHandler = { toBeRan?: () => Promise<R> };
+ const [state, setState] = useState<RunnerHandler>({});
+
+ /**
+ * subscriber will receive a method that will be call when the activator runs
+ *
+ * @param listener function to be run when the activator runs
+ */
+ const subscriber = (listener?: () => T) => {
+ if (listener) {
+ setState({
+ toBeRan: () => {
+ const whatWeGetFromTheListener = listener();
+ return action(whatWeGetFromTheListener);
+ },
+ });
+ } else {
+ setState({
+ toBeRan: undefined,
+ });
+ }
+ };
+
+ /**
+ * activator will call runner if there is someone subscribed
+ */
+ const activator = state.toBeRan
+ ? async () => {
+ if (state.toBeRan) {
+ return state.toBeRan();
+ }
+ return Promise.reject();
+ }
+ : undefined;
+
+ return [activator, subscriber];
+}