Better Live Detection

* Better Live Detection (fixes #89)
* Fix linting errors

package.json

@@ -1,6 +1,6 @@
 {
   "name": "bolingbrook-church",
-  "version": "1.2.14",
+  "version": "1.2.15",
   "license": "MIT",
   "angular-cli": {},
   "scripts": {

src/app/components/pages/home.ts

@@ -10,7 +10,7 @@ import
 })
 export class HomeComponent implements OnInit {
 
-  streaming: boolean = false;
+  live: boolean = false;
   sources: BackgroundVideoSource[];
   sermon: Sermon;
 
@@ -27,11 +27,13 @@ export class HomeComponent implements OnInit {
 
     this.sermons.latest()
       .subscribe((sermon) => { this.sermon = sermon; });
-  }
 
-  get live(): boolean {
-    const now = moment.tz('America/Chicago');
-    return (now.day() === 6 && now.hour() >= 11 &&  now.hour() < 14);
+    this.sermons
+      .liveToday()
+      .subscribe((liveToday) => {
+        const now = moment.tz('America/Chicago');
+        this.live = (liveToday && now.day() === 6 && now.hour() >= 11 &&  now.hour() < 14);
+      });
   }
 
 }

src/app/services/firebase.service.ts

@@ -97,6 +97,11 @@ export class Database {
 
   constructor(private fb: FirebaseService) {}
 
+  exists(path: string): Observable<Boolean> {
+    return observe(this.fb.database.ref(path).once('value'))
+      .map((snap: firebase.database.DataSnapshot) => snap.exists());
+  }
+
   getOnce(path: string): Observable<any> {
     return observe(this.fb.database.ref(path).once('value'))
       .map((snap: firebase.database.DataSnapshot) => snap.val());

src/app/services/sermon.service.spec.ts

@@ -0,0 +1,32 @@
+import { expect, sinon, async, MockBuilder }        from 'testing';
+import {
+  Database,
+  Storage,
+  Sermon,
+  SermonService,
+  Observable
+} from './index';
+import * as moment                                  from 'moment';
+import                                                   'moment-timezone';
+
+describe('SermonService', () => {
+  describe('liveToday', () => {
+    it('should work', async(() => {
+      const db = MockBuilder
+        .of(Database)
+        .withStub('exists', Observable.of(true))
+        .build();
+
+      const store = MockBuilder.of(Storage).build();
+
+      const service = new SermonService(db, store);
+      service
+        .liveToday()
+        .subscribe((isLive) => {
+          expect(isLive).to.be.true;
+          expect(db.exists).to.have.been.calledOnce;
+        });
+
+    }));
+  });
+});

src/app/services/sermon.service.ts

@@ -36,6 +36,11 @@ export class SermonService {
     return cleaned;
   }
 
+  liveToday(date: moment.Moment = moment.tz('America/Chicago')): Observable<Boolean> {
+    const path = date.format('YYYY-MM-DD');
+    return this.db.exists(path);
+  }
+
   getSermon(date: string): Observable<Sermon> {
     return this.db.getOnce(`data/sermons/${date}`)
       .map((sermon: Sermon) => {