Start refactoring state management

src/app/app.component.ts

@@ -1,6 +1,4 @@
 import { Component } from '@angular/core';
-import { Cloneable } from './storage/cloneable';
-import { Root } from './storage/root';
 
 @Component({
   selector: 'app-root',
@@ -9,19 +7,4 @@ import { Root } from './storage/root';
 })
 export class AppComponent {
   title = 'frontend';
-
-  constructor() {
-    const root = new Root<Cloneable>();
-
-    const l1 = new Cloneable(root, 'l1');
-    const r1 = new Cloneable(root, 'r1');
-    const r1r1 = new Cloneable(r1, 'r1r1');
-    const r1l1 = new Cloneable(r1, 'r1l1');
-
-    r1r1.changeName('r1r1 new');
-
-    r1l1.changeName('r1l1 new');
-
-    r1l1.map((c: Cloneable) => c.changeNameMap('bdeiwf'));
-  }
 }

src/app/components/modal/modals/settings/settings.component.html

@@ -8,12 +8,12 @@
   <app-toggle
     [beforeText]="'Hide create tower button'"
     [afterText]="'Show create tower button'"
-    [default]="!dataService.active.userData?.hideCreateTowerButton"
+    [default]="!page.userData.hideCreateTowerButton"
-    (value)="dataService.active.userData.hideCreateTowerButton = !$event"
+    (value)="page?.setHideCreateTowerButton(!$event)"
   ></app-toggle>
 </div>
 <!-- wrapper for easier styling -->
 
-<p *ngIf="dataService.active?.towers.length == 5">There can be a maximum of <strong>5</strong> towers on each page.</p>
+<p *ngIf="page.towers?.length == 5">There can be a maximum of <strong>5</strong> towers on each page.</p>
 
 <button (click)="deletePage()">Delete current page</button>

src/app/components/modal/modals/settings/settings.component.ts

@@ -1,6 +1,7 @@
 import { Component } from '@angular/core';
 import { ModalService } from '../../../../services/modal.service';
 import { DataService } from '../../../../services/data.service';
+import { Page } from '../../../../model/page';
 
 @Component({
   selector: 'app-settings',
@@ -8,12 +9,16 @@ import { DataService } from '../../../../services/data.service';
   styleUrls: ['./settings.component.scss']
 })
 export class SettingsComponent {
-  constructor(public modalService: ModalService, public dataService: DataService) {}
+  constructor(public modalService: ModalService, public dataService: DataService) {
+    this.modalService.active.input.subscribe(p => (this.page = p));
+  }
+
+  page: Page;
 
   async deletePage() {
     try {
-      await this.modalService.showRemovePage(this.dataService.active.name);
+      await this.modalService.showRemovePage(this.page.name);
-      this.dataService.remove();
+      this.dataService.removePage(this.page);
       this.modalService.submit();
     } catch {
       // pass

src/app/components/pages/page/page.component.html

@@ -1,7 +1,4 @@
-<button
+<button *ngIf="page && page.towers.length < 5 && !page.userData?.hideCreateTowerButton" (click)="page.addTower()">
-  *ngIf="page && page.towers.length < 5 && !dataService.active?.userData?.hideCreateTowerButton"
-  (click)="createTower()"
->
   Create tower
 </button>
 

src/app/components/pages/page/page.component.ts

@@ -16,7 +16,6 @@ export class PageComponent {
     }
 
     this._page = value;
-    value.subscribe(() => this.updateDates());
     this.updateDates();
   }
 
@@ -54,10 +53,6 @@ export class PageComponent {
 
   constructor(private modalService: ModalService, public dataService: DataService) {}
 
-  createTower() {
-    this.page.addTower();
-  }
-
   dropDrag(event: any) {
     this.page.moveTower(event);
     this.isDragging = false;

src/app/components/pages/page/tower/tasks/tasks.component.html

@@ -6,8 +6,8 @@
     {{ tasks.length == 0 ? '​' : tasks.length == 1 ? 'task' : 'tasks' }}
   </p>
   <div class="all-task" #allTask [ngStyle]="{ height: (isOpen ? allTask?.scrollHeight : 0) + 'px' }">
-    <div class="task-container" *ngFor="let task of tasks" [ngStyle]="{ color: task.color.toString() }">
+    <div class="task-container" *ngFor="let task of tasks" [ngStyle]="{ color: toHslString(task.color) }">
-      <div [ngStyle]="{ 'background-color': task.color.toString() }"></div>
+      <div [ngStyle]="{ 'background-color': toHslString(task.color) }"></div>
       <p (click)="handleClick(task)" [innerText]="task.description ? task.description : 'unknown'"></p>
     </div>
   </div>

src/app/components/pages/page/tower/tasks/tasks.component.ts

@@ -3,6 +3,8 @@ import { Block } from '../../../../../model/block';
 import { Tower } from '../../../../../model/tower';
 import { ModalService } from '../../../../../services/modal.service';
 import { CancelService } from '../../../../../services/cancel.service';
+import { toHslString } from '../../../../../utils/color';
+import { IColor } from '../../../../../interfaces/persistance/color';
 
 @Component({
   selector: 'app-tasks',
@@ -10,7 +12,9 @@ import { CancelService } from '../../../../../services/cancel.service';
   styleUrls: ['./tasks.component.scss']
 })
 export class TasksComponent implements OnInit {
-  @Input() tasks: Block[];
+  readonly toHslString = toHslString;
+
+  @Input() tasks: Array<Block & { color: IColor }>;
   @Input() tower: Tower;
 
   private _isOpen = false;

src/app/components/pages/page/tower/tower.component.html

@@ -19,6 +19,6 @@
     type="text"
     placeholder="name…"
     [(ngModel)]="tower.name"
-    [ngStyle]="{ color: tower.baseColor.toString() }"
+    [ngStyle]="{ color: toHslString(tower?.baseColor) }"
   />
 </div>

src/app/components/pages/page/tower/tower.component.ts

@@ -2,6 +2,8 @@ import { Component, Input } from '@angular/core';
 import { Tower } from '../../../../model/tower';
 import { ModalService } from '../../../../services/modal.service';
 import { Block } from '../../../../model/block';
+import { IColor } from '../../../../interfaces/persistance/color';
+import { toHslString } from '../../../../utils/color';
 
 @Component({
   selector: 'app-tower',
@@ -9,6 +11,8 @@ import { Block } from '../../../../model/block';
   styleUrls: ['./tower.component.scss']
 })
 export class TowerComponent {
+  readonly toHslString = toHslString;
+
   @Input() set dateRange(value: { from: Date; to: Date }) {
     if (this.dateRange !== undefined && this.dateRange.from === value.from && this.dateRange.to === value.to) {
       return;
@@ -22,14 +26,14 @@ export class TowerComponent {
 
   public constructor(private modalService: ModalService) {}
 
-  get drawableBlocks(): Block[] {
+  get drawableBlocks(): Array<Block & { color: IColor }> {
-    return this.tower.blocks.filter(
+    return this.tower.coloredBlocks.filter(
       block => this.dateRange.from <= block.created && block.created <= this.dateRange.to && block.isDone
     );
   }
 
-  get tasks(): Block[] {
+  get tasks(): Array<Block & { color: IColor }> {
-    return this.tower.blocks.filter(
+    return this.tower.coloredBlocks.filter(
       block => this.dateRange.from <= block.created && block.created <= this.dateRange.to && !block.isDone
     );
   }

src/app/components/pages/pages.component.html

@@ -1,8 +1,8 @@
 <div class="select-add-container">
   <!-- wrapper for easier styling -->
   <app-select-add
-    [options]="dataService.pageNames"
+    [options]="pageNames"
-    [default]="dataService.active?.name"
+    [default]="selectedPageName"
     (value)="selectPage($event)"
     [placeholder]="'Add a new page…'"
   ></app-select-add>
@@ -11,11 +11,7 @@
 
 <div class="page-container">
   <!-- wrapper for easier styling -->
-  <app-page
+  <app-page *ngIf="selectedPage" [page]="selectedPage" (isDragHappening)="isDragHappening = $event"></app-page>
-    *ngIf="dataService.active !== null"
-    [page]="dataService.active"
-    (isDragHappening)="isDragHappening = $event"
-  ></app-page>
 </div>
 <!-- wrapper for easier styling -->
 

src/app/components/pages/pages.component.ts

@@ -2,6 +2,10 @@ import { Component, ElementRef, ViewChild } from '@angular/core';
 import { Page } from '../../model/page';
 import { DataService } from '../../services/data.service';
 import { ModalService } from '../../services/modal.service';
+import { BehaviorSubject } from 'rxjs/internal/BehaviorSubject';
+import { Observable } from 'rxjs/internal/Observable';
+
+const USER_DATA_KEY = 'life-towers.user-data.v.2';
 
 @Component({
   selector: 'app-pages',
@@ -13,28 +17,70 @@ export class PagesComponent {
   @ViewChild('page') page: ElementRef;
   @ViewChild('bottom') bottom: ElementRef;
 
+  pages: Array<Page>;
   isDragHappening = false;
 
-  constructor(public dataService: DataService, private modalService: ModalService) {}
+  get pageNames() {
-
+    if (this.pages) {
-  async selectPage(selected: string) {
+      return this.pages.map(p => p.name);
-    if (!this.dataService.pageNames.includes(selected)) {
+    }
-      const page = new Page({
+    return [];
-        name: selected,
-        towers: [],
-        userData: {}
-      });
-
-      this.dataService.push(page);
-      page.addTower();
   }
 
-    await this.dataService.changeActiveByName(selected);
+  get selectedPage(): Page {
+    try {
+      return this.pages[this.pageNames.indexOf(this.selectedPageName)];
+    } catch {
+      return null;
+    }
+  }
+
+  private _selectedPageName: string;
+  get selectedPageName(): string {
+    return this._selectedPageName;
+  }
+
+  set selectedPageName(value: string) {
+    window.localStorage.setItem(
+      USER_DATA_KEY,
+      JSON.stringify({
+        selectedPage: value
+      })
+    );
+    this._selectedPageName = value;
+  }
+
+  private readonly _selectedPage: BehaviorSubject<Page> = new BehaviorSubject(null);
+  readonly selectedPage$: Observable<Page> = this._selectedPage.asObservable();
+
+  constructor(public dataService: DataService, private modalService: ModalService) {
+    const userData = JSON.parse(window.localStorage.getItem(USER_DATA_KEY));
+    if (userData !== null && userData.selectedPage !== undefined) {
+      this._selectedPageName = userData.selectedPage;
+    }
+
+    this.dataService.safeChildren$.subscribe(pages => {
+      if (pages) {
+        this.pages = pages;
+        if (!this.selectedPage) {
+          this.selectedPageName = this.pages.length > 0 ? this.pages[0].name : null;
+        }
+        this._selectedPage.next(this.selectedPage);
+      }
+    });
+  }
+
+  async selectPage(selected: string) {
+    if (!this.pageNames.includes(selected)) {
+      this.dataService.addPage(selected);
+    }
+    this.selectedPageName = selected;
+    this._selectedPage.next(this.selectedPage);
   }
 
   async openSettings() {
     try {
-      await this.modalService.showSettings();
+      await this.modalService.showSettings(this.selectedPage$);
     } catch {
       // pass
     }

src/app/components/shared/toggle/toggle.component.ts

@@ -12,7 +12,7 @@ export class ToggleComponent {
   @Output() value: EventEmitter<boolean> = new EventEmitter();
 
   @Input() set default(value: boolean) {
-    this.on = value;
+    this._on = value;
   }
 
   private _on = false;

src/app/interfaces/persistance/block.ts

@@ -1,4 +1,7 @@
-export interface IBlock {
+import { Typed } from './typed';
+
+export interface IBlock extends Typed {
+  type: 'Block';
   created: Date;
   tag: string;
   isDone: boolean;

src/app/interfaces/persistance/color.ts

@@ -1,4 +1,7 @@
-export interface IColor {
+import { Typed } from './typed';
+
+export interface IColor extends Typed {
+  type: 'Color';
   h: number;
   s: number;
   l: number;

src/app/interfaces/persistance/page.ts

@@ -1,12 +1,14 @@
 import { ITower } from './tower';
+import { Typed } from './typed';
 
-export interface IPage {
+export interface IPage extends Typed {
+  type: 'Page';
   name: string;
   towers: ITower[];
 
   userData: {
-    hideCreateTowerButton: boolean;
+    hideCreateTowerButton?: boolean;
-    defaultDateRange: {
+    defaultDateRange?: {
       from: Date;
       to: Date;
     };

src/app/interfaces/persistance/tower.ts

@@ -1,7 +1,9 @@
 import { IBlock } from './block';
 import { IColor } from './color';
+import { Typed } from './typed';
 
-export interface ITower {
+export interface ITower extends Typed {
+  type: 'Tower';
   name: string;
   blocks: IBlock[];
   baseColor: IColor;

src/app/interfaces/persistance/typed.ts

@@ -0,0 +1,3 @@
+export interface Typed {
+  type: string;
+}

src/app/model/base.ts

@@ -1,57 +0,0 @@
-import { Subject } from 'rxjs/internal/Subject';
-
-export class Base {
-  private static propertyList: any = {};
-  protected subscribers: (() => void)[] = [];
-
-  subject: Subject<this> = new Subject();
-
-  constructor(properties: any) {
-    const type = this.constructor.name;
-    if (!Base.propertyList.hasOwnProperty(type)) {
-      Base.propertyList[type] = [];
-    }
-
-    for (const property in properties) {
-      if (properties.hasOwnProperty(property)) {
-        const propertyName = `__${property}`;
-        this[propertyName] = properties[property];
-
-        Object.defineProperty(this, property, {
-          get: () => this[propertyName],
-          set: value => {
-            if (value == this[propertyName]) {
-              return;
-            }
-            this[propertyName] = value;
-            this.update();
-          }
-        });
-
-        if (!Base.propertyList[type].includes(property)) {
-          Base.propertyList[type].push(property);
-        }
-      }
-    }
-  }
-
-  toJSON(): object {
-    return Base.propertyList[this.constructor.name].reduce(
-      (object, property) => ({
-        [property]: this[property],
-        ...object
-      }),
-      // TODO
-      { type: this.constructor.name }
-    );
-  }
-
-  subscribe(func: () => void) {
-    this.subscribers.push(func);
-  }
-
-  protected update() {
-    this.subject.next(this);
-    this.subscribers.map(f => f());
-  }
-}

src/app/model/block.ts

@@ -1,26 +1,18 @@
-import { Base } from './base';
+import { Serializable } from './serializable';
 import { IBlock } from '../interfaces/persistance/block';
-import { Color } from './color';
+import { Node } from '../storage/node';
 
-export class Block extends Base implements IBlock {
+export class Block extends Serializable implements IBlock {
-  constructor(props: IBlock) {
+  constructor(parent: Node, props: IBlock) {
-    // TODO: remove
+    super(parent, props);
-    if (props.isDone === undefined) {
-      props.isDone = true;
-    }
-
-    super(props);
 
     if (this.created.constructor.name !== 'Date') {
-      // Prevent update message
+      this.created = new Date(this.created);
-      // @ts-ignore
-      this.__created = new Date(this.created);
     }
   }
 
-  color: Color;
-
   // Only here to prevent ts warnings.
+  type: 'Block';
   created: Date;
   isDone: boolean;
   description: string;

src/app/model/color.ts

@@ -1,28 +0,0 @@
-import { IColor } from '../interfaces/persistance/color';
-import { Base } from './base';
-
-export class Color extends Base implements IColor {
-  constructor(props: IColor) {
-    super(props);
-  }
-
-  // Only here to prevent ts warnings.
-  h: number;
-  s: number;
-  l: number;
-
-  public lighten(by: number) {
-    const newL = this.l + by;
-    if (this.l > 100) {
-      this.l = 100;
-    } else if (this.l < 0) {
-      this.l = 0;
-    }
-
-    return new Color({ h: this.h, s: this.s, l: newL });
-  }
-
-  public toString(): string {
-    return `hsl(${this.h}, ${this.s}%, ${this.l}%)`;
-  }
-}

src/app/model/page.ts

@@ -1,23 +1,20 @@
-import { Base } from './base';
+import { Serializable } from './serializable';
 import { IPage } from '../interfaces/persistance/page';
 import { Tower } from './tower';
-import { ITower } from '../interfaces/persistance/tower';
+import { Node } from '../storage/node';
 
-export class Page extends Base implements IPage {
+export class Page extends Serializable implements IPage {
-  constructor(props) {
+  constructor(parent: Node, props: IPage) {
-    // TODO: remove
+    super(parent, props);
-    if (!props.userData) {
-      props.userData = {};
-    }
-
-    super(props);
-    // @ts-ignore to prevent update message
-    this.__towers = this.towers.map(t => this.createTower(t));
   }
 
   // Only here to prevent ts warnings.
   name: string;
-  towers: Tower[];
+  get towers(): Array<Tower> {
+    return this.children as Array<Tower>;
+  }
+  type: 'Page';
+
   userData: {
     hideCreateTowerButton: boolean;
     defaultDateRange: {
@@ -26,15 +23,26 @@ export class Page extends Base implements IPage {
     };
   };
 
+  setHideCreateTowerButton(value: boolean) {
+    this.changeKey({
+      propertyName: 'userData',
+      value: {
+        ...this.userData,
+        hideCreateTowerButton: value
+      }
+    });
+  }
+
   moveTower({ previousIndex, currentIndex }: { previousIndex: number; currentIndex: number }) {
     if (previousIndex === currentIndex) {
       return;
     }
 
-    const tower = this.towers[previousIndex];
+    this.map(page => {
-    this.towers.splice(previousIndex, 1);
+      const tower = page.towers[previousIndex];
-    this.towers.splice(currentIndex, 0, tower);
+      page.towers.splice(previousIndex, 1);
-    this.update();
+      page.towers.splice(currentIndex, 0, tower);
+    });
   }
 
   addTower(name = '') {
@@ -43,24 +51,18 @@ export class Page extends Base implements IPage {
       hue = Math.random() * 360;
     } while (30 <= hue && hue <= 200);
 
-    this.towers.push(
+    new Tower(this, {
-      this.createTower({
+      type: 'Tower',
       name,
       blocks: [],
-        baseColor: { h: hue, s: 100, l: 50 }
+      baseColor: { h: hue, s: 100, l: 50, type: 'Color' }
-      })
+    });
-    );
-
-    this.update();
-  }
-
-  private createTower(props: ITower): Tower {
-    const tower = new Tower(props);
-    tower.subscribe(() => this.update());
-    return tower;
   }
 
   removeTower(tower: Tower) {
-    this.towers = this.towers.filter(t => t !== tower);
+    this.changeValue({
+      oldValue: this.towers,
+      newValue: this.towers.filter(t => t !== tower)
+    });
   }
 }

src/app/model/serializable.ts

@@ -0,0 +1,51 @@
+import { Cloneable } from '../storage/cloneable';
+import { Node } from '../storage/node';
+
+export class Serializable extends Cloneable {
+  type: string;
+  private static propertyList: any = {};
+  static childrenMap: {
+    [type: string]: {
+      childrenConstructor: typeof Serializable;
+      childrenListName: string;
+    };
+  };
+
+  constructor(parent: Node, properties: any) {
+    super(parent);
+
+    const type = this.constructor.name;
+    if (!Serializable.propertyList.hasOwnProperty(type)) {
+      Serializable.propertyList[type] = [];
+    }
+    for (const property in properties) {
+      if (properties.hasOwnProperty(property)) {
+        const propertyValue = properties[property];
+        if (property === Serializable.childrenMap[type].childrenListName) {
+          // This should be ran after the original constructor has finished.
+          new Promise(r => r()).then(() => {
+            for (let child of propertyValue) {
+              new Serializable.childrenMap[type].childrenConstructor(this, child);
+            }
+          });
+        } else {
+          this[property] = properties[property];
+        }
+
+        if (!Serializable.propertyList[type].includes(property)) {
+          Serializable.propertyList[type].push(property);
+        }
+      }
+    }
+  }
+
+  toJSON(): object {
+    return Serializable.propertyList[this.constructor.name].reduce(
+      (object, property) => ({
+        [property]: this[property],
+        ...object
+      }),
+      {}
+    );
+  }
+}

src/app/model/tower.ts

@@ -1,54 +1,51 @@
 import { ITower } from '../interfaces/persistance/tower';
-import { Color } from './color';
+import { lighten } from '../utils/color';
 import { Block } from './block';
-import { Base } from './base';
+import { Serializable } from './serializable';
-import { IBlock } from '../interfaces/persistance/block';
 import { hash } from '../utils/hash';
+import { Node } from '../storage/node';
+import { IColor } from '../interfaces/persistance/color';
 
-export class Tower extends Base implements ITower {
+export class Tower extends Serializable implements ITower {
-  constructor(props: ITower) {
+  constructor(parent: Node, props: ITower) {
-    super(props);
+    super(parent, props);
 
-    // @ts-ignore to prevent update message
-    this.__baseColor = new Color(this.baseColor);
-
-    this.blocks = this.blocks.map(b => this.createBlock(b));
     this.blocks.sort((a, b) => a.created.getTime() - b.created.getTime());
+    this.calculateTagList();
   }
 
   tags: string[];
 
   // Only here to prevent ts warnings.
   name: string;
-  blocks: Block[];
+  type: 'Tower';
-  baseColor: Color;
+  get blocks(): Array<Block> {
+    return this.children as Array<Block>;
+  }
+  baseColor: IColor;
+
+  get coloredBlocks(): Array<Block & { color: IColor }> {
+    return this.children.map(b => {
+      const coloredBlock = b as Block & { color: IColor };
+      coloredBlock.color = lighten((hash(coloredBlock.tag) - 0.5) * 50, this.baseColor);
+      return coloredBlock;
+    });
+  }
 
   addBlock(props: { tag: string; description: string; isDone: boolean }) {
-    this.blocks.push(
+    new Block(this, {
-      this.createBlock({
       created: new Date(),
-        ...props
+      ...props,
-      })
+      type: 'Block'
-    );
+    });
-
-    this.update();
   }
 
-  private createBlock(props: IBlock): Block {
+  private calculateTagList() {
-    const block = new Block(props);
-    block.subscribe(() => this.update());
-    return block;
-  }
-
-  protected update() {
     this.tags = [];
     for (const block of this.blocks) {
       if (!this.tags.includes(block.tag)) {
         this.tags.push(block.tag);
       }
-      block.color = this.baseColor.lighten(hash(block.tag) * 50);
+    }
-    }
-
-    super.update();
   }
 }

src/app/services/data.service.ts

@@ -1,93 +1,69 @@
 import { Injectable } from '@angular/core';
 import { StoreService } from './store.service';
 import { Page } from '../model/page';
-
+import { Root } from '../storage/root';
-const USER_DATA_KEY = 'life-towers.user-data.v.1';
+import { Serializable } from '../model/serializable';
+import { Tower } from '../model/tower';
+import { Block } from '../model/block';
+import { IPage } from '../interfaces/persistance/page';
+import { BehaviorSubject } from 'rxjs/internal/BehaviorSubject';
+import { Observable } from 'rxjs/internal/Observable';
 
 @Injectable({
   providedIn: 'root'
 })
-export class DataService {
+export class DataService extends Root<Page> {
-  get active(): Page {
+  get pages(): Array<Page> {
-    return this._active;
+    return this.children;
   }
 
-  get pageNames(): string[] {
+  private readonly _safeChildren: BehaviorSubject<Array<Page>> = new BehaviorSubject(null);
-    return this.data.map(p => p.name);
+  readonly safeChildren$: Observable<Array<Page>> = this._safeChildren.asObservable();
-  }
 
-  private subscribers: (() => void)[] = [];
+  constructor(private storeService: StoreService<Array<IPage>>) {
-  private _active: Page = null;
+    super();
-  private data: Page[];
+    this.init().catch();
-  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();
+    const pages = await this.storeService.load();
-    this.data.map(p => p.subscribe(() => this.save()));
+    Serializable.childrenMap = {
-    this._active = this.data.length > 0 ? this.data[0] : null;
+      Page: {
-    this.loadActiveIndex();
+        childrenListName: 'towers',
-    this.afterLoadFinished();
+        childrenConstructor: Tower
+      },
+      Tower: {
+        childrenListName: 'blocks',
+        childrenConstructor: Block
+      },
+      Block: {
+        childrenListName: null,
+        childrenConstructor: null
+      }
+    };
+    for (let page of pages) {
+      new Page(this, page);
+    }
+    this.children$.subscribe(value => {
+      this.log();
+      this._safeChildren.next(value);
+      this.storeService.scheduleSave(this.pages);
+    });
   }
 
-  private save() {
+  addPage(name: string) {
-    this.storeService.save(this.data);
+    new Page(this, {
-    this.update();
+      name,
+      userData: {},
+      type: 'Page',
+      towers: []
+    });
   }
 
-  private update() {
+  removePage(page: Page) {
-    this.subscribers.map(f => f());
+    this.changeValue({
-  }
+      oldValue: this.children,
-
+      newValue: this.children.filter(c => c !== page)
-  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
-      })
-    );
   }
 }

src/app/services/modal.service.ts

@@ -2,6 +2,8 @@ import { Injectable } from '@angular/core';
 import { Tower } from '../model/tower';
 import { top } from '../utils/top';
 import { CancelService } from './cancel.service';
+import { Page } from '../model/page';
+import { Observable } from 'rxjs/internal/Observable';
 
 export enum ModalType {
   createBlock,
@@ -44,8 +46,8 @@ export class ModalService {
     return this.createPromiseAndPushToStack(data, ModalType.editBlock);
   }
 
-  showSettings(): Promise<void> {
+  showSettings(selectedPage: Observable<Page>): Promise<void> {
-    return this.createPromiseAndPushToStack(null, ModalType.settings);
+    return this.createPromiseAndPushToStack(selectedPage, ModalType.settings);
   }
 
   showRemoveTower(tower: Tower): Promise<void> {

src/app/services/store.service.ts

@@ -1,82 +1,98 @@
 import { Injectable } from '@angular/core';
 import { Page } from '../model/page';
+import { IPage } from '../interfaces/persistance/page';
 
-const LOCAL_STORAGE_KEY = 'life-towers.data.v.2';
+const LOCAL_STORAGE_KEY = 'life-towers.data.v.3';
 
 @Injectable({
   providedIn: 'root'
 })
-export class StoreService {
+export class StoreService<T> {
-  private storedData: Page[];
+  private saveScheduled = false;
-
+  private dataToSave: T;
+  private storedData: T;
   private mockData: string = JSON.stringify([
     {
       name: 'Work & life',
       userData: {},
+      type: 'Page',
       towers: [
         {
           name: 'work',
-          baseColor: { h: 0, s: 100, l: 50 },
+          baseColor: { h: 0, s: 100, l: 50, type: 'Color' },
+          type: 'Tower',
           blocks: [
             {
               created: new Date(2015, 2, 13),
               tag: 'a',
               description: 'done it',
-              isDone: true
+              isDone: true,
+              type: 'Block'
             },
             {
               created: new Date(2016, 2, 15),
               tag: 'go to school',
-              description: 'done it'
+              description: 'done it',
+              type: 'Block'
             },
             {
               created: new Date(2017, 2, 15),
               tag: 'go to work',
-              isDone: true
+              isDone: true,
+              type: 'Block'
             },
             {
               created: new Date(2018, 2, 13),
               tag: 'go to work',
               description: 'done it',
-              isDone: true
+              isDone: true,
+              type: 'Block'
             },
             {
               created: new Date(2019, 3, 13),
-              tag: 'go to work'
+              tag: 'go to work',
+              type: 'Block'
             },
             {
               created: new Date(2020, 2, 15),
               tag: 'go to school',
               description: 'done it',
-              isDone: true
+              isDone: true,
+              type: 'Block'
             },
             {
               created: new Date(2021, 2, 15),
-              tag: 'go to school'
+              tag: 'go to school',
+              type: 'Block'
             }
           ]
         },
         {
-          baseColor: { h: 180, s: 100, l: 50 },
+          baseColor: { h: 180, s: 100, l: 50, type: 'Color' },
           name: 'life',
+          type: 'Tower',
           blocks: [
             {
               created: new Date(2019, 3, 13),
               tag: 'go home',
-              description: 'done it'
+              description: 'done it',
+              type: 'Block'
             },
             {
               created: new Date(2019, 4, 13),
-              tag: 'go home'
+              tag: 'go home',
+              type: 'Block'
             },
             {
               created: new Date(2019, 4, 15),
               tag: 'go to work',
-              description: 'done it'
+              description: 'done it',
+              type: 'Block'
             },
             {
               created: new Date(2019, 4, 15, 14),
-              tag: 'go to work'
+              tag: 'go to work',
+              type: 'Block'
             }
           ]
         }
@@ -86,17 +102,30 @@ export class StoreService {
 
   constructor() {
     const localStorageData = localStorage.getItem(LOCAL_STORAGE_KEY);
-    const data = JSON.parse(localStorageData ? localStorageData : this.mockData);
+    this.storedData = JSON.parse(localStorageData ? localStorageData : this.mockData) as T;
-    this.storedData = data.map(p => new Page(p));
   }
 
-  async load(): Promise<Page[]> {
+  scheduleSave(data: T) {
+    this.dataToSave = data;
+    if (!this.saveScheduled) {
+      this.saveScheduled = true;
+      setTimeout(() => {
+        this.saveScheduled = false;
+        this.save(this.dataToSave).catch();
+      }, 0);
+    }
+  }
+
+  async load(): Promise<T> {
+    console.log('load', this.storedData);
     return this.storedData;
   }
 
-  async save(data: Page[]) {
+  async save(data: T) {
     this.storedData = data;
-    console.log('save', this.storedData);
+    const stringified = JSON.stringify(this.storedData, null, 2);
-    window.localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(this.storedData));
+    console.log('save');
+    // console.log('save', stringified);
+    window.localStorage.setItem(LOCAL_STORAGE_KEY, stringified);
   }
 }

src/app/storage/cloneable.ts

@@ -2,23 +2,10 @@ import { InnerNode } from './inner-node';
 import { Node } from './node';
 
 export class Cloneable extends InnerNode {
-  name;
+  constructor(parent: Node) {
-  constructor(parent: Node, name: any) {
     super(parent);
-    this.name = name;
   }
 
-  changeNameMap = (newValue: string) => {
-    this.name = newValue;
-  };
-
-  changeName = (newValue: any) => {
-    this.changeValue({
-      oldValue: this.name,
-      newValue
-    });
-  };
-
   protected cloneWithMap(map: (node: this) => void): this {
     const insides = Object.getOwnPropertyDescriptors(this);
 
@@ -27,11 +14,19 @@ export class Cloneable extends InnerNode {
         if (prop == '__target__') {
           return target;
         }
+        if (target.hasOwnProperty(prop)) {
           const value = target[prop as string].value;
           if (typeof value === 'function') {
             return value.bind(proxy);
           }
           return value;
+        } else if (this.hasOwnProperty(prop)) {
+          const value = this[prop];
+          if (typeof value === 'function') {
+            return value.bind(proxy);
+          }
+          return value;
+        }
       },
       set: (target, prop, value) => {
         return (target[prop as string].value = value);
@@ -39,6 +34,10 @@ export class Cloneable extends InnerNode {
     });
     map(<any>insidesProxy);
 
+    (<any>insidesProxy.__target__).id.value = Node.id++;
+    (<any>insidesProxy.__target__).copyCount.value++;
+    Node.sumCopyCount++;
+
     return Object.create(Object.getPrototypeOf(this), <any>insidesProxy.__target__);
   }
 
@@ -46,6 +45,8 @@ export class Cloneable extends InnerNode {
     const insides = Object.getOwnPropertyDescriptors(this);
     insides[propertyName].value = value;
     insides.id.value = Node.id++;
+    insides.copyCount.value++;
+    Node.sumCopyCount++;
 
     return Object.create(Object.getPrototypeOf(this), insides);
   }
@@ -53,6 +54,8 @@ export class Cloneable extends InnerNode {
   protected cloneWithModify({ oldValue, newValue }: { oldValue: any; newValue: any }): this {
     const insides = Object.getOwnPropertyDescriptors(this);
     insides.id.value = Node.id++;
+    insides.copyCount.value++;
+    Node.sumCopyCount++;
 
     let wasMatch = false;
     for (let name in insides) {

src/app/storage/inner-node.ts

@@ -26,7 +26,7 @@ export abstract class InnerNode extends Node {
     return this.update((self: this) => this.cloneWithMap.call(self, map));
   }
 
-  changeKey(update: { value: any; propertyName: string }): this {
+  changeKey(update: { propertyName: string; value: any }): this {
     return this.update((self: this) => this.cloneWithAdd.call(self, update));
   }
 

src/app/storage/node.ts

@@ -1,16 +1,17 @@
 import { InnerNode } from './inner-node';
 
 export abstract class Node {
-  public static id = 0;
+  protected static id = 0;
+  protected static sumCopyCount = 0;
   protected abstract readonly children: Array<InnerNode>;
   private id = Node.id++;
+  protected copyCount = 1;
 
-  changeKey(update: { value: any; propertyName: string }) {
+  abstract changeKey(update: { propertyName: string; value: any });
-    throw new TypeError('Not implemented!');
+  abstract changeValue(update: { oldValue: any; newValue: any });
-  }
 
-  changeValue(update: { oldValue: any; newValue: any }) {
+  constructor() {
-    throw new TypeError('Not implemented!');
+    Node.sumCopyCount++;
   }
 
   addChild(update: { value: InnerNode }) {
@@ -26,4 +27,18 @@ export abstract class Node {
       newValue: this.children.map(c => (c === oldValue ? newValue : c))
     });
   }
+
+  protected _log(indent = ''): string {
+    const basicInfo = `${indent} - ${this.constructor.name}, #${this.id}`;
+    let response = `${basicInfo}${' '.repeat(25 - basicInfo.length)}siblings: ${this.copyCount}\n`;
+    for (let c of this.children) {
+      response += `${c._log(indent + '  ')}`;
+    }
+    return response;
+  }
+
+  public log() {
+    console.log(this._log());
+    console.log(`All in all, there are ${Node.sumCopyCount} objects.`);
+  }
 }

src/app/storage/root.ts

@@ -16,13 +16,22 @@ export class Root<T extends InnerNode> extends Node {
   }
 
   changeValue({ oldValue, newValue }: { oldValue: any; newValue: any }) {
-    if (this.children === oldValue) {
+    if (this.children !== oldValue) {
+      throw new TypeError('Only children can be changed.');
+    }
     this.children = newValue;
     for (let child of this.children) {
       child.parent = this;
     }
-    } else {
+  }
+
+  changeKey({ propertyName, value }: { propertyName: string; value: any }) {
+    if (propertyName !== 'children') {
       throw new TypeError('Only children can be changed.');
     }
+    this.children = value;
+    for (let child of this.children) {
+      child.parent = this;
+    }
   }
 }

src/app/utils/color.ts

@@ -0,0 +1,16 @@
+import { IColor } from '../interfaces/persistance/color';
+
+export const lighten = (by: number, { h, s, l }: IColor): IColor => {
+  let newL = l + by;
+  if (newL > 100) {
+    newL = 100;
+  } else if (newL < 0) {
+    newL = 0;
+  }
+
+  return { h, s, l: newL, type: 'Color' };
+};
+
+export const toHslString = ({ h, s, l }: IColor): string => {
+  return `hsl(${h}, ${s}%, ${l}%)`;
+};