import { NgZone } from '@angular/core';
import { TestBed } from '@angular/core/testing';
import { ɵAngularFireSchedulers } from '@angular/fire';
import { AngularFireModule, FIREBASE_APP_NAME, FIREBASE_OPTIONS, FirebaseApp } from '@angular/fire/compat';
import { AngularFireDatabase, AngularFireDatabaseModule, USE_EMULATOR } from '@angular/fire/compat/database';
import 'firebase/compat/database';
import { COMMON_CONFIG, databaseEmulatorPort } from '../../../src/test-config';
import { rando } from '../../../src/utils';

describe('AngularFireDatabase', () => {
  let app: FirebaseApp;
  let db: AngularFireDatabase;
  let zone: NgZone;
  let firebaseAppName: string;

  beforeEach(() => {
    firebaseAppName = rando();
    TestBed.configureTestingModule({
      imports: [
        AngularFireModule.initializeApp(COMMON_CONFIG, firebaseAppName),
        AngularFireDatabaseModule
      ],
      providers: [
        { provide: USE_EMULATOR, useValue: ['localhost', databaseEmulatorPort] }
      ]
    });

    app = TestBed.inject(FirebaseApp);
    db = TestBed.inject(AngularFireDatabase);
    zone = TestBed.inject(NgZone);
  });

  describe('<constructor>', () => {

    it('should be an AngularFireDatabase type', () => {
      expect(db instanceof AngularFireDatabase).toEqual(true);
    });

    it('should have an initialized Firebase app', () => {
      expect(db.database.app).toBeDefined();
    });

    it('should accept a Firebase App in the constructor', (done) => {
      const schedulers = TestBed.runInInjectionContext(() => new ɵAngularFireSchedulers());
      const database = new AngularFireDatabase(
        app.options, rando(), undefined, {}, zone, schedulers, undefined, undefined,
        undefined, undefined, undefined, undefined, undefined, undefined, undefined,
      );
      expect(database instanceof AngularFireDatabase).toEqual(true);
      // try { database.database.app.delete().then(done, done); } catch(e) { done(); }
      done();
    });

    it('should have an initialized Firebase app instance member', () => {
      expect(db.database.app.name).toEqual(firebaseAppName);
    });

  });

});

describe('AngularFireDatabase w/options', () => {
  let db: AngularFireDatabase;
  let firebaseAppName: string;
  
  beforeEach(() => {
    firebaseAppName = rando();
    TestBed.configureTestingModule({
      imports: [
        AngularFireModule.initializeApp(COMMON_CONFIG, rando()),
        AngularFireDatabaseModule
      ],
      providers: [
        { provide: FIREBASE_APP_NAME, useValue: firebaseAppName },
        { provide: FIREBASE_OPTIONS, useValue: COMMON_CONFIG },
        { provide: USE_EMULATOR, useValue: ['localhost', databaseEmulatorPort] }
      ]
    });

    db = TestBed.inject(AngularFireDatabase);
  });

  describe('<constructor>', () => {

    it('should be an AngularFireDatabase type', () => {
      expect(db instanceof AngularFireDatabase).toEqual(true);
    });

    it('should have an initialized Firebase app', () => {
      expect(db.database.app).toBeDefined();
    });

    it('should have an initialized Firebase app instance member', () => {
      expect(db.database.app.name).toEqual(firebaseAppName);
    });

    /* INVESTIGATE database(url) does not seem to be working

        it('database be pointing to the provided DB instance', () => {
          expect(db.database.ref().toString()).toEqual(url);
        });

        it('list should be using the provided DB instance', () => {
          expect(db.list(query).query.toString()).toEqual(`${url}/${query}`);
        });

        it('object should be using the provided DB instance', () => {
          expect(db.object(query).query.toString()).toEqual(`${url}/${query}`);
        });
    */
  });

});
