import { onAuthStateChanged, onIdTokenChanged, getIdToken } from 'firebase/auth';
import { Observable, from, of } from 'rxjs';
import { switchMap } from 'rxjs/operators';

/**
 * @license
 * Copyright 2018 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Create an observable of authentication state. The observer is only
 * triggered on sign-in or sign-out.
 * @param auth firebase.auth.Auth
 */
function authState(auth) {
    return new Observable(function (subscriber) {
        var unsubscribe = onAuthStateChanged(auth, subscriber.next.bind(subscriber), subscriber.error.bind(subscriber), subscriber.complete.bind(subscriber));
        return { unsubscribe: unsubscribe };
    });
}
/**
 * Create an observable of user state. The observer is triggered for sign-in,
 * sign-out, and token refresh events
 * @param auth firebase.auth.Auth
 */
function user(auth) {
    return new Observable(function (subscriber) {
        var unsubscribe = onIdTokenChanged(auth, subscriber.next.bind(subscriber), subscriber.error.bind(subscriber), subscriber.complete.bind(subscriber));
        return { unsubscribe: unsubscribe };
    });
}
/**
 * Create an observable of idToken state. The observer is triggered for sign-in,
 * sign-out, and token refresh events
 * @param auth firebase.auth.Auth
 */
function idToken(auth) {
    return user(auth).pipe(switchMap(function (user) { return (user ? from(getIdToken(user)) : of(null)); }));
}

export { authState, idToken, user };
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