import {AuthProviders, FirebaseAuthState, FirebaseAuth, AuthMethods} from "angularfire2";
import {Injectable} from "@angular/core";
import {Subject, BehaviorSubject} from "rxjs";
import {AuthInfo} from "./AuthInfo";

@Injectable()
export class AuthService {

static UNKNOW_USER = new AuthInfo(null);

private authState: FirebaseAuthState = null;
public authInfo$: BehaviorSubject = new BehaviorSubject(AuthService.UNKNOW_USER);

constructor(public auth$: FirebaseAuth) {
auth$.subscribe((state: FirebaseAuthState) => {
this.authState = state;
});
}

signUp(email, password){
return this.fromFirebaseAuthPromise(this.auth$.createUser(
{email, password}
));
}

login(email, password) {

return this.fromFirebaseAuthPromise(this.auth$.login({  
  email, password  
},{  
  method: AuthMethods.Password,  
  provider: AuthProviders.Password  
}));  

}

logout(){
this.auth$.logout();
this.authInfo$.next(AuthService.UNKNOW_USER);
}

fromFirebaseAuthPromise(promise) {
const subject = new Subject();

promise.then((res) => {  
  const uid = this.authState.uid;  
  const authInfo = new AuthInfo(uid);  
  this.authInfo$.next(authInfo);  
  subject.next(res);  
  subject.complete();  
}, err => {  
  this.authInfo$.error(err);  
  subject.error(err);  
  subject.complete();  
});

return subject.asObservable();  

}
}