/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {PLATFORM_ID} from '@angular/core';
import {TestBed} from '@angular/core/testing';

import {NgswCommChannel} from '../src/low_level';
import {RegistrationOptions, ngswCommChannelFactory} from '../src/module';
import {SwPush} from '../src/push';
import {SwUpdate} from '../src/update';
import {MockPushManager, MockPushSubscription, MockServiceWorkerContainer, MockServiceWorkerRegistration, patchDecodeBase64} from '../testing/mock';
import {async_fit, async_it} from './async';

{
  describe('ServiceWorker library', () => {
    let mock: MockServiceWorkerContainer;
    let comm: NgswCommChannel;

    beforeEach(() => {
      mock = new MockServiceWorkerContainer();
      comm = new NgswCommChannel(mock as any);
    });

    describe('NgswCommsChannel', () => {
      it('can access the registration when it comes before subscription', done => {
        const mock = new MockServiceWorkerContainer();
        const comm = new NgswCommChannel(mock as any);
        const regPromise = mock.getRegistration() as any as MockServiceWorkerRegistration;

        mock.setupSw();

        (comm as any).registration.subscribe((reg: any) => { done(); });
      });
      it('can access the registration when it comes after subscription', done => {
        const mock = new MockServiceWorkerContainer();
        const comm = new NgswCommChannel(mock as any);
        const regPromise = mock.getRegistration() as any as MockServiceWorkerRegistration;

        (comm as any).registration.subscribe((reg: any) => { done(); });

        mock.setupSw();
      });
    });

    describe('ngswCommChannelFactory', () => {
      it('gives disabled NgswCommChannel for platform-server', () => {
        TestBed.configureTestingModule({
          providers: [
            {provide: PLATFORM_ID, useValue: 'server'},
            {provide: RegistrationOptions, useValue: {enabled: true}}, {
              provide: NgswCommChannel,
              useFactory: ngswCommChannelFactory,
              deps: [RegistrationOptions, PLATFORM_ID]
            }
          ]
        });

        expect(TestBed.get(NgswCommChannel).isEnabled).toEqual(false);
      });
      it('gives disabled NgswCommChannel when \'enabled\' option is false', () => {
        TestBed.configureTestingModule({
          providers: [
            {provide: PLATFORM_ID, useValue: 'browser'},
            {provide: RegistrationOptions, useValue: {enabled: false}}, {
              provide: NgswCommChannel,
              useFactory: ngswCommChannelFactory,
              deps: [RegistrationOptions, PLATFORM_ID]
            }
          ]
        });

        expect(TestBed.get(NgswCommChannel).isEnabled).toEqual(false);
      });
      it('gives disabled NgswCommChannel when navigator.serviceWorker is undefined', () => {
        TestBed.configureTestingModule({
          providers: [
            {provide: PLATFORM_ID, useValue: 'browser'},
            {provide: RegistrationOptions, useValue: {enabled: true}},
            {
              provide: NgswCommChannel,
              useFactory: ngswCommChannelFactory,
              deps: [RegistrationOptions, PLATFORM_ID],
            },
          ],
        });

        const context: any = global || window;
        const originalDescriptor = Object.getOwnPropertyDescriptor(context, 'navigator');
        const patchedDescriptor = {value: {serviceWorker: undefined}, configurable: true};

        try {
          // Set `navigator` to `{serviceWorker: undefined}`.
          Object.defineProperty(context, 'navigator', patchedDescriptor);
          expect(TestBed.get(NgswCommChannel).isEnabled).toBe(false);
        } finally {
          if (originalDescriptor) {
            Object.defineProperty(context, 'navigator', originalDescriptor);
          } else {
            delete context.navigator;
          }
        }
      });
      it('gives enabled NgswCommChannel when browser supports SW and enabled option is true',
         () => {
           TestBed.configureTestingModule({
             providers: [
               {provide: PLATFORM_ID, useValue: 'browser'},
               {provide: RegistrationOptions, useValue: {enabled: true}}, {
                 provide: NgswCommChannel,
                 useFactory: ngswCommChannelFactory,
                 deps: [RegistrationOptions, PLATFORM_ID]
               }
             ]
           });

           const context: any = global || window;
           const originalDescriptor = Object.getOwnPropertyDescriptor(context, 'navigator');
           const patchedDescriptor = {value: {serviceWorker: mock}, configurable: true};

           try {
             // Set `navigator` to `{serviceWorker: mock}`.
             Object.defineProperty(context, 'navigator', patchedDescriptor);
             expect(TestBed.get(NgswCommChannel).isEnabled).toBe(true);
           } finally {
             if (originalDescriptor) {
               Object.defineProperty(context, 'navigator', originalDescriptor);
             } else {
               delete context.navigator;
             }
           }
         });
    });

    describe('SwPush', () => {
      let unpatchDecodeBase64: () => void;
      let push: SwPush;

      // Patch `SwPush.decodeBase64()` in Node.js (where `atob` is not available).
      beforeAll(() => unpatchDecodeBase64 = patchDecodeBase64(SwPush.prototype as any));
      afterAll(() => unpatchDecodeBase64());

      beforeEach(() => {
        push = new SwPush(comm);
        mock.setupSw();
      });

      it('is injectable', () => {
        TestBed.configureTestingModule({
          providers: [
            SwPush,
            {provide: NgswCommChannel, useValue: comm},
          ]
        });
        expect(() => TestBed.get(SwPush)).not.toThrow();
      });

      describe('requestSubscription()', () => {
        async_it('returns a promise that resolves to the subscription', async() => {
          const promise = push.requestSubscription({serverPublicKey: 'test'});
          expect(promise).toEqual(jasmine.any(Promise));

          const sub = await promise;
          expect(sub).toEqual(jasmine.any(MockPushSubscription));
        });

        async_it('calls `PushManager.subscribe()` (with appropriate options)', async() => {
          const decode = (charCodeArr: Uint8Array) =>
              Array.from(charCodeArr).map(c => String.fromCharCode(c)).join('');

          // atob('c3ViamVjdHM/') === 'subjects?'
          const serverPublicKey = 'c3ViamVjdHM_';
          const appServerKeyStr = 'subjects?';

          const pmSubscribeSpy = spyOn(MockPushManager.prototype, 'subscribe').and.callThrough();
          await push.requestSubscription({serverPublicKey});

          expect(pmSubscribeSpy).toHaveBeenCalledTimes(1);
          expect(pmSubscribeSpy).toHaveBeenCalledWith({
            applicationServerKey: jasmine.any(Uint8Array),
            userVisibleOnly: true,
          });

          const actualAppServerKey = pmSubscribeSpy.calls.first().args[0].applicationServerKey;
          const actualAppServerKeyStr = decode(actualAppServerKey);
          expect(actualAppServerKeyStr).toBe(appServerKeyStr);
        });

        async_it('emits the new `PushSubscription` on `SwPush.subscription`', async() => {
          const subscriptionSpy = jasmine.createSpy('subscriptionSpy');
          push.subscription.subscribe(subscriptionSpy);
          const sub = await push.requestSubscription({serverPublicKey: 'test'});

          expect(subscriptionSpy).toHaveBeenCalledWith(sub);
        });
      });

      describe('unsubscribe()', () => {
        let psUnsubscribeSpy: jasmine.Spy;

        beforeEach(() => {
          psUnsubscribeSpy = spyOn(MockPushSubscription.prototype, 'unsubscribe').and.callThrough();
        });

        async_it('rejects if currently not subscribed to push notifications', async() => {
          try {
            await push.unsubscribe();
            throw new Error('`unsubscribe()` should fail');
          } catch (err) {
            expect(err.message).toBe('Not subscribed to push notifications.');
          }
        });

        async_it('calls `PushSubscription.unsubscribe()`', async() => {
          await push.requestSubscription({serverPublicKey: 'test'});
          await push.unsubscribe();

          expect(psUnsubscribeSpy).toHaveBeenCalledTimes(1);
        });

        async_it('rejects if `PushSubscription.unsubscribe()` fails', async() => {
          psUnsubscribeSpy.and.callFake(() => { throw new Error('foo'); });

          try {
            await push.requestSubscription({serverPublicKey: 'test'});
            await push.unsubscribe();
            throw new Error('`unsubscribe()` should fail');
          } catch (err) {
            expect(err.message).toBe('foo');
          }
        });

        async_it('rejects if `PushSubscription.unsubscribe()` returns false', async() => {
          psUnsubscribeSpy.and.returnValue(Promise.resolve(false));

          try {
            await push.requestSubscription({serverPublicKey: 'test'});
            await push.unsubscribe();
            throw new Error('`unsubscribe()` should fail');
          } catch (err) {
            expect(err.message).toBe('Unsubscribe failed!');
          }
        });

        async_it('emits `null` on `SwPush.subscription`', async() => {
          const subscriptionSpy = jasmine.createSpy('subscriptionSpy');
          push.subscription.subscribe(subscriptionSpy);

          await push.requestSubscription({serverPublicKey: 'test'});
          await push.unsubscribe();

          expect(subscriptionSpy).toHaveBeenCalledWith(null);
        });

        async_it('does not emit on `SwPush.subscription` on failure', async() => {
          const subscriptionSpy = jasmine.createSpy('subscriptionSpy');
          const initialSubEmit = new Promise(resolve => subscriptionSpy.and.callFake(resolve));

          push.subscription.subscribe(subscriptionSpy);
          await initialSubEmit;
          subscriptionSpy.calls.reset();

          // Error due to no subscription.
          await push.unsubscribe().catch(() => undefined);
          expect(subscriptionSpy).not.toHaveBeenCalled();

          // Subscribe.
          await push.requestSubscription({serverPublicKey: 'test'});
          subscriptionSpy.calls.reset();

          // Error due to `PushSubscription.unsubscribe()` error.
          psUnsubscribeSpy.and.callFake(() => { throw new Error('foo'); });
          await push.unsubscribe().catch(() => undefined);
          expect(subscriptionSpy).not.toHaveBeenCalled();

          // Error due to `PushSubscription.unsubscribe()` failure.
          psUnsubscribeSpy.and.returnValue(Promise.resolve(false));
          await push.unsubscribe().catch(() => undefined);
          expect(subscriptionSpy).not.toHaveBeenCalled();
        });
      });

      describe('messages', () => {
        it('receives push messages', () => {
          const sendMessage = (type: string, message: string) =>
              mock.sendMessage({type, data: {message}});

          const receivedMessages: string[] = [];
          push.messages.subscribe((msg: {message: string}) => receivedMessages.push(msg.message));

          sendMessage('PUSH', 'this was a push message');
          sendMessage('NOTPUSH', 'this was not a push message');
          sendMessage('PUSH', 'this was a push message too');
          sendMessage('HSUP', 'this was a HSUP message');

          expect(receivedMessages).toEqual([
            'this was a push message',
            'this was a push message too',
          ]);
        });
      });
      describe('messagesClicked', () => {
        it('receives notification clicked messages', () => {
          const sendMessage = (type: string, message: string) =>
              mock.sendMessage({type, data: {message}});

          const receivedMessages: string[] = [];
          push.messagesClicked.subscribe(
              (msg: {message: string}) => receivedMessages.push(msg.message));

          sendMessage('NOTIFICATION_CLICK', 'this was a click');
          sendMessage('NOT_IFICATION_CLICK', 'this was not a click');
          sendMessage('NOTIFICATION_CLICK', 'this was a click too');
          sendMessage('KCILC_NOITACIFITON', 'this was a KCILC_NOITACIFITON message');

          expect(receivedMessages).toEqual([
            'this was a click',
            'this was a click too',
          ]);
        });
      });

      describe('subscription', () => {
        let nextSubEmitResolve: () => void;
        let nextSubEmitPromise: Promise<void>;
        let subscriptionSpy: jasmine.Spy;

        beforeEach(() => {
          nextSubEmitPromise = new Promise(resolve => nextSubEmitResolve = resolve);
          subscriptionSpy = jasmine.createSpy('subscriptionSpy').and.callFake(() => {
            nextSubEmitResolve();
            nextSubEmitPromise = new Promise(resolve => nextSubEmitResolve = resolve);
          });

          push.subscription.subscribe(subscriptionSpy);
        });

        async_it('emits on worker-driven changes (i.e. when the controller changes)', async() => {
          // Initial emit for the current `ServiceWorkerController`.
          await nextSubEmitPromise;
          expect(subscriptionSpy).toHaveBeenCalledTimes(1);
          expect(subscriptionSpy).toHaveBeenCalledWith(null);

          subscriptionSpy.calls.reset();

          // Simulate a `ServiceWorkerController` change.
          mock.setupSw();
          await nextSubEmitPromise;
          expect(subscriptionSpy).toHaveBeenCalledTimes(1);
          expect(subscriptionSpy).toHaveBeenCalledWith(null);
        });

        async_it('emits on subscription changes (i.e. when subscribing/unsubscribing)', async() => {
          await nextSubEmitPromise;
          subscriptionSpy.calls.reset();

          // Subscribe.
          await push.requestSubscription({serverPublicKey: 'test'});
          expect(subscriptionSpy).toHaveBeenCalledTimes(1);
          expect(subscriptionSpy).toHaveBeenCalledWith(jasmine.any(MockPushSubscription));

          subscriptionSpy.calls.reset();

          // Subscribe again.
          await push.requestSubscription({serverPublicKey: 'test'});
          expect(subscriptionSpy).toHaveBeenCalledTimes(1);
          expect(subscriptionSpy).toHaveBeenCalledWith(jasmine.any(MockPushSubscription));

          subscriptionSpy.calls.reset();

          // Unsubscribe.
          await push.unsubscribe();
          expect(subscriptionSpy).toHaveBeenCalledTimes(1);
          expect(subscriptionSpy).toHaveBeenCalledWith(null);
        });
      });

      describe('with no SW', () => {
        beforeEach(() => {
          comm = new NgswCommChannel(undefined);
          push = new SwPush(comm);
        });

        it('does not crash on subscription to observables', () => {
          push.messages.toPromise().catch(err => fail(err));
          push.messagesClicked.toPromise().catch(err => fail(err));
          push.subscription.toPromise().catch(err => fail(err));
        });

        it('gives an error when registering', done => {
          push.requestSubscription({serverPublicKey: 'test'}).catch(err => { done(); });
        });

        it('gives an error when unsubscribing',
           done => { push.unsubscribe().catch(err => { done(); }); });
      });
    });

    describe('SwUpdate', () => {
      let update: SwUpdate;
      beforeEach(() => {
        update = new SwUpdate(comm);
        mock.setupSw();
      });
      it('processes update availability notifications when sent', done => {
        update.available.subscribe(event => {
          expect(event.current).toEqual({hash: 'A'});
          expect(event.available).toEqual({hash: 'B'});
          expect(event.type).toEqual('UPDATE_AVAILABLE');
          done();
        });
        mock.sendMessage({
          type: 'UPDATE_AVAILABLE',
          current: {
            hash: 'A',
          },
          available: {
            hash: 'B',
          },
        });
      });
      it('processes update activation notifications when sent', done => {
        update.activated.subscribe(event => {
          expect(event.previous).toEqual({hash: 'A'});
          expect(event.current).toEqual({hash: 'B'});
          expect(event.type).toEqual('UPDATE_ACTIVATED');
          done();
        });
        mock.sendMessage({
          type: 'UPDATE_ACTIVATED',
          previous: {
            hash: 'A',
          },
          current: {
            hash: 'B',
          },
        });
      });
      it('activates updates when requested', done => {
        mock.messages.subscribe((msg: {action: string, statusNonce: number}) => {
          expect(msg.action).toEqual('ACTIVATE_UPDATE');
          mock.sendMessage({
            type: 'STATUS',
            nonce: msg.statusNonce,
            status: true,
          });
        });
        return update.activateUpdate().then(() => done()).catch(err => done.fail(err));
      });
      it('reports activation failure when requested', done => {
        mock.messages.subscribe((msg: {action: string, statusNonce: number}) => {
          expect(msg.action).toEqual('ACTIVATE_UPDATE');
          mock.sendMessage({
            type: 'STATUS',
            nonce: msg.statusNonce,
            status: false,
            error: 'Failed to activate',
          });
        });
        return update.activateUpdate()
            .catch(err => { expect(err.message).toEqual('Failed to activate'); })
            .then(() => done())
            .catch(err => done.fail(err));
      });
      it('is injectable', () => {
        TestBed.configureTestingModule({
          providers: [
            SwUpdate,
            {provide: NgswCommChannel, useValue: comm},
          ]
        });
        expect(() => TestBed.get(SwUpdate)).not.toThrow();
      });
      describe('with no SW', () => {
        beforeEach(() => { comm = new NgswCommChannel(undefined); });
        it('can be instantiated', () => { update = new SwUpdate(comm); });
        it('does not crash on subscription to observables', () => {
          update = new SwUpdate(comm);
          update.available.toPromise().catch(err => fail(err));
          update.activated.toPromise().catch(err => fail(err));
        });
        it('gives an error when checking for updates', done => {
          update = new SwUpdate(comm);
          update.checkForUpdate().catch(err => { done(); });
        });
        it('gives an error when activating updates', done => {
          update = new SwUpdate(comm);
          update.activateUpdate().catch(err => { done(); });
        });
      });
    });
  });
}