[demo] better? demo mode

frontend/src/app/components/start/start.component.ts

@@ -3,8 +3,8 @@ import { Subscription } from 'rxjs';
 import { MarkBlockState, StateService } from '@app/services/state.service';
 import { specialBlocks } from '@app/app.constants';
 import { BlockExtended } from '@interfaces/node-api.interface';
-import { Router } from '@angular/router';
-import { sleep$ } from '@app/shared/common.utils';
+import { Router, ActivatedRoute } from '@angular/router';
+import { handleDemoRedirect } from '../../shared/common.utils';
 
 @Component({
   selector: 'app-start',
@@ -63,7 +63,8 @@ export class StartComponent implements OnInit, AfterViewChecked, OnDestroy {
   constructor(
     public stateService: StateService,
     private cd: ChangeDetectorRef,
-    private router: Router
+    private router: Router,
+    private route: ActivatedRoute
   ) {
     this.isiOS = ['iPhone','iPod','iPad'].includes((navigator as any)?.userAgentData?.platform || navigator.platform);
     if (this.stateService.network === '') {
@@ -71,26 +72,8 @@ export class StartComponent implements OnInit, AfterViewChecked, OnDestroy {
     }
   }
 
-  async demoMode() {
-    // @ts-ignore
-    if (!window.demoMode) {
-      // @ts-ignore
-      window.demoMode = true;
-      const paths = ['', 'acceleration', 'mining', 'lightning'];
-      let i = 0;
-      while ('Bitcoin is still alive') {
-        i = (i + 1) % paths.length;
-        this.router.navigateByUrl(paths[i]);
-        await sleep$(30000);
-      }
-    }
-  }
-
   ngOnInit() {
-    // @ts-ignore
-    if (window.location.search === '?demo=1') {
-      this.demoMode();
-    }
+    handleDemoRedirect(this.route, this.router);
 
     this.firstPageWidth = 40 + (this.blockWidth * this.dynamicBlocksAmount);
     this.blockCounterSubscription = this.stateService.blocks$.subscribe((blocks) => {