Reformat code

src/app/services/data.service.ts

@@ -0,0 +1,93 @@
+import { Injectable } from '@angular/core';
+import { StoreService } from './store.service';
+import { Page } from '../model/page';
+
+const USER_DATA_KEY = 'life-towers.user-data.v.1';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class DataService {
+  get active(): Page {
+    return this._active;
+  }
+
+  get pageNames(): string[] {
+    return this.data.map(p => p.name);
+  }
+
+  private subscribers: (() => void)[] = [];
+  private _active: Page = null;
+  private data: Page[];
+  private hasLoaded = new Promise(resolve => (this.afterLoadFinished = resolve));
+  private afterLoadFinished: () => void;
+
+  constructor(private storeService: StoreService) {
+    this.init();
+  }
+
+  push(value: Page) {
+    value.subscribe(() => this.save());
+    this.data.push(value);
+    this._active = value;
+    this.save();
+  }
+
+  remove() {
+    this.data = this.data.filter(p => p !== this.active);
+    this._active = this.data.length > 0 ? this.data[0] : null;
+    this.save();
+  }
+
+  subscribe(func: () => void) {
+    this.subscribers.push(func);
+  }
+
+  async changeActiveByName(name: string): Promise<void> {
+    await this.hasLoaded;
+    this._active = this.data.filter(p => p.name === name)[0];
+    this.saveActiveIndex(this.data.indexOf(this.active));
+    this.update();
+  }
+
+  async changeActiveByIndex(index: number): Promise<void> {
+    await this.hasLoaded;
+    this._active = this.data[index];
+    this.saveActiveIndex(index);
+    this.update();
+  }
+
+  private async init() {
+    this.data = await this.storeService.load();
+    this.data.map(p => p.subscribe(() => this.save()));
+    this._active = this.data.length > 0 ? this.data[0] : null;
+    this.loadActiveIndex();
+    this.afterLoadFinished();
+  }
+
+  private save() {
+    this.storeService.save(this.data);
+    this.update();
+  }
+
+  private update() {
+    this.subscribers.map(f => f());
+  }
+
+  private loadActiveIndex() {
+    const userData = JSON.parse(window.localStorage.getItem(USER_DATA_KEY));
+    if (userData === null) {
+      return;
+    }
+    this._active = this.data[userData.index];
+  }
+
+  private saveActiveIndex(index: number) {
+    window.localStorage.setItem(
+      USER_DATA_KEY,
+      JSON.stringify({
+        index
+      })
+    );
+  }
+}