import {

EnvironmentProviders,

InjectionToken,

Injector,

NgModule,

NgZone,

Optional,

makeEnvironmentProviders,

} from '@angular/core';

import { VERSION, ɵAngularFireSchedulers, ɵgetDefaultInstanceOf } from '@angular/fire';

import { FirebaseApp, FirebaseApps } from '@angular/fire/app';

import { AppCheckInstances } from '@angular/fire/app-check';

import { registerVersion } from 'firebase/app';

import { Auth as FirebaseAuth } from 'firebase/auth';

import { AUTH_PROVIDER_NAME, Auth, AuthInstances } from './auth';

export const PROVIDED_AUTH_INSTANCES = new InjectionToken<Auth[]>('angularfire2.auth-instances');

export function defaultAuthInstanceFactory(provided: FirebaseAuth[]|undefined, defaultApp: FirebaseApp) {

const defaultAuth = ɵgetDefaultInstanceOf<FirebaseAuth>(AUTH_PROVIDER_NAME, provided, defaultApp);

return defaultAuth && new Auth(defaultAuth);

}

export function authInstanceFactory(fn: (injector: Injector) => FirebaseAuth) {

return (zone: NgZone, injector: Injector) => {

const auth = zone.runOutsideAngular(() => fn(injector));

return new Auth(auth);

};

}

const AUTH_INSTANCES_PROVIDER = {

provide: AuthInstances,

deps: [

[new Optional(), PROVIDED_AUTH_INSTANCES ],

]

};

const DEFAULT_AUTH_INSTANCE_PROVIDER = {

provide: Auth,

useFactory: defaultAuthInstanceFactory,

deps: [

[new Optional(), PROVIDED_AUTH_INSTANCES ],

FirebaseApp,

]

};

@NgModule({

providers: [

DEFAULT_AUTH_INSTANCE_PROVIDER,

AUTH_INSTANCES_PROVIDER,

]

})

export class AuthModule {

constructor() {

registerVersion('angularfire', VERSION.full, 'auth');

}

}

export function provideAuth(fn: (injector: Injector) => FirebaseAuth, ...deps: any[]): EnvironmentProviders {

registerVersion('angularfire', VERSION.full, 'auth');

return makeEnvironmentProviders([

DEFAULT_AUTH_INSTANCE_PROVIDER,

AUTH_INSTANCES_PROVIDER,

{

provide: PROVIDED_AUTH_INSTANCES,

useFactory: authInstanceFactory(fn),

multi: true,

deps: [

NgZone,

Injector,

ɵAngularFireSchedulers,

FirebaseApps,

[new Optional(), AppCheckInstances ],

...deps,

]

}

]);

}