feat(dashboard): implement player

src/app/@core/data/data.module.ts

@@ -5,12 +5,14 @@ import { UserService } from './users.service';
 import { ElectricityService } from './electricity.service';
 import { StateService } from './state.service';
 import { SmartTableService } from './smart-table.service';
+import { PlayerService } from './player.service';
 
 const SERVICES = [
   UserService,
   ElectricityService,
   StateService,
   SmartTableService,
+  PlayerService,
 ];
 
 @NgModule({

src/app/@core/data/player.service.ts

@@ -0,0 +1,67 @@
+import { Injectable } from '@angular/core';
+import 'rxjs/add/observable/of';
+
+export class Track {
+  name: string;
+  artist: string;
+  url: string;
+  cover: string;
+}
+
+@Injectable()
+export class PlayerService {
+  current: number;
+  playlist: Track[] = [
+    {
+      name: 'Don\'t Wanna Fight',
+      artist: 'Alabama Shakes',
+      url: 'https://p.scdn.co/mp3-preview/6156cdbca425a894972c02fca9d76c0b70e001af',
+      cover: './assets/images/cover1.jpg',
+    },
+    {
+      name: 'Good Vibrations',
+      artist: 'Marky Mark And The Funky Bunch',
+      url: 'https://p.scdn.co/mp3-preview/d502c5fa63d28442808779a3832524b4fb1c44fa',
+      cover: './assets/images/cover2.jpg',
+    },
+    {
+      name: 'Come Together',
+      artist: 'Beatles',
+      url: 'https://p.scdn.co/mp3-preview/83090a4db6899eaca689ae35f69126dbe65d94c9',
+      cover: './assets/images/cover3.jpg',
+    },
+  ];
+
+  random(): Track {
+    this.current = Math.floor(Math.random() * this.playlist.length);
+    return this.playlist[this.current];
+  }
+
+  next(): Track {
+    return this.getNextTrack();
+  }
+
+  prev() {
+    return this.getPrevTrack();
+  }
+
+  private getNextTrack(): Track {
+    if (this.current === this.playlist.length - 1) {
+      this.current = 0;
+    } else {
+      this.current++;
+    }
+
+    return this.playlist[this.current];
+  }
+
+  private getPrevTrack(): Track {
+    if (this.current === 0) {
+      this.current = this.playlist.length - 1;
+    } else {
+      this.current--;
+    }
+
+    return this.playlist[this.current];
+  }
+}