/**
 * @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 {PrefetchAssetGroup} from '../src/assets';
import {CacheDatabase} from '../src/db-cache';
import {IdleScheduler} from '../src/idle';
import {MockFileSystemBuilder, MockServerStateBuilder, tmpHashTable, tmpManifestSingleAssetGroup} from '../testing/mock';
import {SwTestHarness, SwTestHarnessBuilder} from '../testing/scope';

(function() {
// Skip environments that don't support the minimum APIs needed to run the SW tests.
if (!SwTestHarness.envIsSupported()) {
  return;
}

const dist = new MockFileSystemBuilder()
                 .addFile('/foo.txt', 'this is foo')
                 .addFile('/bar.txt', 'this is bar')
                 .build();

const manifest = tmpManifestSingleAssetGroup(dist);

const server = new MockServerStateBuilder().withStaticFiles(dist).withManifest(manifest).build();

const scope = new SwTestHarnessBuilder().withServerState(server).build();

const db = new CacheDatabase(scope, scope);


describe('prefetch assets', () => {
  let group: PrefetchAssetGroup;
  let idle: IdleScheduler;
  beforeEach(() => {
    idle = new IdleScheduler(null!, 3000, {
      log: (v, ctx = '') => console.error(v, ctx),
    });
    group = new PrefetchAssetGroup(
        scope, scope, idle, manifest.assetGroups![0], tmpHashTable(manifest), db, 'test');
  });
  it('initializes without crashing', async () => {
    await group.initializeFully();
  });
  it('fully caches the two files', async () => {
    await group.initializeFully();
    scope.updateServerState();
    const res1 = await group.handleFetch(scope.newRequest('/foo.txt'), scope);
    const res2 = await group.handleFetch(scope.newRequest('/bar.txt'), scope);
    expect(await res1!.text()).toEqual('this is foo');
    expect(await res2!.text()).toEqual('this is bar');
  });
  it('persists the cache across restarts', async () => {
    await group.initializeFully();
    const freshScope = new SwTestHarnessBuilder().withCacheState(scope.caches.dehydrate()).build();
    group = new PrefetchAssetGroup(
        freshScope, freshScope, idle, manifest.assetGroups![0], tmpHashTable(manifest),
        new CacheDatabase(freshScope, freshScope), 'test');
    await group.initializeFully();
    const res1 = await group.handleFetch(scope.newRequest('/foo.txt'), scope);
    const res2 = await group.handleFetch(scope.newRequest('/bar.txt'), scope);
    expect(await res1!.text()).toEqual('this is foo');
    expect(await res2!.text()).toEqual('this is bar');
  });
  it('caches properly if resources are requested before initialization', async () => {
    const res1 = await group.handleFetch(scope.newRequest('/foo.txt'), scope);
    const res2 = await group.handleFetch(scope.newRequest('/bar.txt'), scope);
    expect(await res1!.text()).toEqual('this is foo');
    expect(await res2!.text()).toEqual('this is bar');
    scope.updateServerState();
    await group.initializeFully();
  });
  it('throws if the server-side content does not match the manifest hash', async () => {
    const badHashFs = dist.extend().addFile('/foo.txt', 'corrupted file').build();
    const badServer =
        new MockServerStateBuilder().withManifest(manifest).withStaticFiles(badHashFs).build();
    const badScope = new SwTestHarnessBuilder().withServerState(badServer).build();
    group = new PrefetchAssetGroup(
        badScope, badScope, idle, manifest.assetGroups![0], tmpHashTable(manifest),
        new CacheDatabase(badScope, badScope), 'test');
    const err = await errorFrom(group.initializeFully());
    expect(err.message).toContain('Hash mismatch');
  });
});
})();

function errorFrom(promise: Promise<any>): Promise<any> {
  return promise.catch(err => err);
}