add swipl-wasm

commit 563116331f
Author: eneller <erikneller@gmx.de>
Date:   Sun Feb 1 10:28:19 2026 +0100

    fix: edit list items

commit 1946c599be
Author: eneller <erikneller@gmx.de>
Date:   Sun Feb 1 10:19:16 2026 +0100

    fix: minor misc ui and data

commit 7c7762515b
Author: eneller <erikneller@gmx.de>
Date:   Sat Jan 31 23:02:01 2026 +0100

    feat: navbar

commit aaa0ab0638
Author: eneller <erikneller@gmx.de>
Date:   Sat Jan 31 21:05:23 2026 +0100

    feat: remove players

commit 4082932095
Author: eneller <erikneller@gmx.de>
Date:   Sat Jan 31 20:36:49 2026 +0100

    feat: dataservice

commit b6d34ce262
Author: eneller <erikneller@gmx.de>
Date:   Sat Jan 31 17:12:37 2026 +0100

    wip: rotations accordion

commit 764ce43138
Author: eneller <erikneller@gmx.de>
Date:   Sat Jan 31 16:29:11 2026 +0100

    refactor: basic screen

commit 1bc97df0da
Author: eneller <erikneller@gmx.de>
Date:   Sat Jan 31 15:52:06 2026 +0100

    feat: deduplicated player adding

commit 5408a8d9b6
Author: eneller <erikneller@gmx.de>
Date:   Sat Jan 31 00:31:01 2026 +0100

    central players list

commit 665cb25d34
Author: eneller <erikneller@gmx.de>
Date:   Fri Jan 30 23:15:16 2026 +0100

    feat: modal

commit 3b8e5145c3
Author: eneller <erikneller@gmx.de>
Date:   Fri Jan 30 22:51:09 2026 +0100

    wip: player modal

commit 51414f5a99
Author: eneller <erikneller@gmx.de>
Date:   Fri Jan 30 22:03:48 2026 +0100

    refactor: extract randomizer to component

angular.json

@@ -35,6 +35,7 @@
             ],
             "styles": [
               "node_modules/bootstrap/dist/css/bootstrap.min.css",
+              "node_modules/bootstrap-icons/font/bootstrap-icons.min.css",
               "src/styles.less"
             ],
             "scripts": [],

package-lock.json

@@ -23,9 +23,11 @@
         "@ng-bootstrap/ng-bootstrap": "^18.0.0",
         "@popperjs/core": "^2.11.8",
         "bootstrap": "^5.3.3",
+        "bootstrap-icons": "^1.13.1",
         "express": "^4.18.2",
         "rxjs": "~7.8.0",
         "sonarqube-scanner": "^4.3.0",
+        "swipl-wasm": "^7.0.5",
         "tslib": "^2.3.0",
         "zone.js": "~0.15.0"
       },
@@ -5314,6 +5316,12 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/emscripten": {
+      "version": "1.41.5",
+      "resolved": "https://registry.npmjs.org/@types/emscripten/-/emscripten-1.41.5.tgz",
+      "integrity": "sha512-cMQm7pxu6BxtHyqJ7mQZ2kXWV5SLmugybFdHCBbJ5eHzOo6VhBckEgAT3//rP5FwPHNPeEiq4SmQ5ucBwsOo4Q==",
+      "license": "MIT"
+    },
     "node_modules/@types/eslint": {
       "version": "9.6.1",
       "resolved": "https://registry.npmjs.org/@types/eslint/-/eslint-9.6.1.tgz",
@@ -6249,6 +6257,22 @@
         "@popperjs/core": "^2.11.8"
       }
     },
+    "node_modules/bootstrap-icons": {
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/bootstrap-icons/-/bootstrap-icons-1.13.1.tgz",
+      "integrity": "sha512-ijombt4v6bv5CLeXvRWKy7CuM3TRTuPEuGaGKvTV5cz65rQSY8RQ2JcHt6b90cBBAC7s8fsf2EkQDldzCoXUjw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/twbs"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/bootstrap"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -13611,6 +13635,18 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/swipl-wasm": {
+      "version": "7.0.5",
+      "resolved": "https://registry.npmjs.org/swipl-wasm/-/swipl-wasm-7.0.5.tgz",
+      "integrity": "sha512-3J6NYJq+G5xepS4zCTh15fdS9An0D/zqOLpF9l6y20nPEZcOagZ0v8Vt2IclPn4njFFL1LmgsBfHqjxZjkFYPA==",
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "@types/emscripten": "^1.41.5"
+      },
+      "bin": {
+        "swipl-generate": "dist/bin/index.js"
+      }
+    },
     "node_modules/symbol-observable": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-4.0.0.tgz",

package.json

@@ -27,9 +27,11 @@
     "@ng-bootstrap/ng-bootstrap": "^18.0.0",
     "@popperjs/core": "^2.11.8",
     "bootstrap": "^5.3.3",
+    "bootstrap-icons": "^1.13.1",
     "express": "^4.18.2",
     "rxjs": "~7.8.0",
     "sonarqube-scanner": "^4.3.0",
+    "swipl-wasm": "^7.0.5",
     "tslib": "^2.3.0",
     "zone.js": "~0.15.0"
   },

src/app/app.component.html

@@ -1,59 +1,16 @@
 <main class="main">
-  <div class="row justify-content-md-center">
+    <router-outlet></router-outlet>
-    <h1>Please select the number of teams:</h1>
-  <div class="btn-toolbar mb-3 col justify-content-center" role="toolbar">
-  <div class="btn-group me-2" id="numTeamsSelector" role="group"
-    value="2">
-    <input value="2" [(ngModel)]="numTeamsSelectorValue" type="radio" class="btn-check" name="btnradio" id="btnradio1" autocomplete="off" checked>
-    <label class="btn btn-outline-primary" for="btnradio1">Two</label>
-
-    <input value="3" [(ngModel)]="numTeamsSelectorValue" type="radio" class="btn-check" name="btnradio" id="btnradio2" autocomplete="off">
-    <label class="btn btn-outline-primary" for="btnradio2">Three</label>
-
-    <input value="n" [(ngModel)]="numTeamsSelectorValue" type="radio" class="btn-check" name="btnradio" id="btnradio3" autocomplete="off">
-    <label class="btn btn-outline-primary" for="btnradio3">n</label>
-  </div>
-  <div *ngIf="numTeamsSelectorValue === 'n'" id="nTeamsText" class="col-md-auto">
-    <label for="nTeamsField">n Teams</label>
-    <input type="number" pattern="\d*" [(ngModel)]="nTeamsValue" id="nTeamsField" class="form-control" >
-  </div>
-</div>
-
-  <form>
-    <div class="container">
-    <label for="playerNames">Names</label>
-    <textarea [(ngModel)]="playerNamesValue"
-      class="form-control mb-3"
-      rows="18" 
-      cols="30"
-      style="text-align: left;" 
-      name="playerNames"
-      #playerNames
-      id="playerNames"
-      ></textarea>
-    </div>
-  <button type="button" (click)="onButtonGenerate(playerNames.value)" class="btn btn-primary">Generate</button>
-  </form>
-
-  <table class="table table-striped custom-table">
-  <caption *ngIf="duplicateNames.length >0">Removed: {{ duplicateNames }}</caption>
-    <thead>
-      <tr>
-        <th scope="col">Size</th>
-        <th scope="col">Names</th>
-      </tr>
-    </thead>
-    <tbody>
-      @for (team of teamsArray; track $index) {
-        <tr>
-          <td style="text-wrap: wrap;">{{ team.length | number }}</td>
-          <td class="wrap-cell">{{ team }}</td>
-        </tr>
-      }
-    </tbody>
-  </table>
-
-</div>
 </main>
-
+<nav>
-<router-outlet />
+  <ul ngbNav [activeId]="activeId" class="nav-tabs custom-navbar bg-body-secondary">
+    <li ngbNavItem="/" class="custom-navitem"><a ngbNavLink routerLink="" routerLinkActive="active">
+      <i class="bi bi-pencil-square"></i>{{ data.getPlayers().length }}</a>
+    </li>
+    <li ngbNavItem="/basic.t" class="custom-navitem"><a ngbNavLink routerLink="/basic.t" routerLinkActive="active">
+      <i class="bi bi-shuffle"></i></a>
+    </li>
+    <li ngbNavItem="/rotations.t" class="custom-navitem"><a ngbNavLink routerLink="/rotations.t" routerLinkActive="active">
+      <i class="bi bi-arrow-repeat"></i></a>
+    </li>
+  </ul>
+</nav>

src/app/app.component.less

@@ -15,4 +15,21 @@ tr{
 .wrap-cell{
     word-break: break-all;
     white-space: normal;
+}
+.main{
+    margin-bottom: 5rem;
+    padding: 1rem;
+    overflow-y: auto;
+}
+.custom-navbar{
+    width: 100vw;
+    position: fixed;
+    bottom: 0;
+    display: flex;
+    justify-content: space-around; /* Distribute items evenly */
+    z-index: 1000;
+}
+.custom-navitem{
+    text-align: center; /* Center the content of each item */
+    flex: 1;
 }

src/app/app.component.ts

@@ -1,77 +1,48 @@
-import { Component, OnInit} from '@angular/core';
+import { Component, inject, OnInit} from '@angular/core';
 import { FormsModule } from '@angular/forms';
-import { RouterOutlet, ActivatedRoute } from '@angular/router';
+import { RouterOutlet, ActivatedRoute, RouterLink, Router, NavigationEnd } from '@angular/router';
 import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
 
 import { CommonModule } from '@angular/common';
 import { filter, take } from 'rxjs';
+import { Player } from './util/model';
+import { DataService } from './data.service';
 
 @Component({
   selector: 'app-root',
-  imports: [NgbModule, RouterOutlet, CommonModule, FormsModule],
+  imports: [NgbModule, RouterOutlet, CommonModule, FormsModule, RouterLink],
   templateUrl: './app.component.html',
   styleUrl: './app.component.less'
 })
 export class AppComponent implements OnInit {
   title = 'vb';
-  playerNamesValue = "";
+  data = inject(DataService);
-  numTeamsSelectorValue = "2";
+  activeId = '/';
-  numTeamsSelected = 2;
-  nTeamsValue = "4";
-  teamsArray: string[][] = [];
-  duplicateNames: string[] = [];
 
-  constructor(private activatedRoute: ActivatedRoute){}
+  constructor(
+    private route: ActivatedRoute,
+    private router: Router
+  ){}
 
   ngOnInit(): void {
-    this.activatedRoute.queryParams.pipe(
+    this.router.events
-      filter(params => Object.keys(params).length > 0), // Only proceed if params are not empty
+      .pipe(filter(event => event instanceof NavigationEnd))
+      .subscribe(() => {
+        this.activeId = this.router.url;
+      });
+    // process query params
+    this.route.queryParams.pipe(
+      // Only proceed if params are not empty
+      filter(params => Object.keys(params).length > 0),
       take(1)
     ).subscribe(params => {
-      const names = params['names']?.replaceAll(',', '\n');
+      if (params['names']){
-      if (names) {
+        this.data.setPlayers(
-        this.playerNamesValue = names;
+          params['names'].split(',').map((name: string) => new Player(name))
+        );
       }
     });
   }
 
-  onButtonGenerate(textinput: string): void{
-    if(this.numTeamsSelectorValue === 'n'){
-      this.numTeamsSelected  = Number(this.nTeamsValue);
-    }
-    else{
-      this.numTeamsSelected = Number(this.numTeamsSelectorValue);
-    }
-    let nameslist = this.playerNamesValue
-        .split('\n')
-        .map(function(str){return str.trim();})
-        .filter(function(str){return str}); // boolean interpretation is same as non-empty
-    // remove duplicates by using a Set
-    let namesset = new Set(nameslist);
-    let names = [...namesset];
-
-    
-    let teams = Array.from({ length: this.numTeamsSelected }, () => []);
-    let playersPerTeam = Math.floor(names.length / this.numTeamsSelected);
-
-    let nameslen = names.length;
-    function* iter(list: any[]){
-        let index = 0;
-        while(true){
-            yield list[index % list.length];
-            index++;
-        }
-    }
-    let iterator = iter(teams);
-    for(let i =0; i < nameslen; i++){
-        let index = Math.floor(Math.random()* names.length);
-        let n = names[index]; 
-        names.splice(index,1);
-        let team = iterator.next().value;
-        team.push(n);
-
-    }
-    this.teamsArray = teams;
-  }
 
 }

src/app/app.routes.ts

@@ -1,3 +1,19 @@
 import { Routes } from '@angular/router';
+import { ScreenBasicComponent } from './screen-basic/screen-basic.component';
+import { ScreenEditComponent } from './screen-edit/screen-edit.component';
+import { ScreenRotationsComponent } from './screen-rotations/screen-rotations.component';
 
-export const routes: Routes = [];
+export const routes: Routes = [
+    {
+    path: '',
+    children: [
+      { path: '', component: ScreenEditComponent },
+      /* IMPORTANT: all routes have to include a `.` (dot)
+      this is a workaround used in `sw.js`
+      to allow hosting services on the same subdomain as this PWA
+      */
+      { path: 'basic.t', component: ScreenBasicComponent },
+      { path: 'rotations.t', component: ScreenRotationsComponent }
+    ]
+  }
+];

src/app/data.service.spec.ts

@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { DataService } from './data.service';
+
+describe('DataService', () => {
+  let service: DataService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(DataService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});

src/app/data.service.ts

@@ -0,0 +1,34 @@
+import { Injectable } from '@angular/core';
+import { Player } from './util/model';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class DataService {
+  private players: Player[] = [];
+  teams: Player[][] = [];
+
+  setPlayers(players: Player[]){
+    for (let player of players){
+      this.addPlayer(player);
+    }
+  }
+  
+  addPlayer(player: Player): boolean{
+    if (player.name.trim() && Player.isNew(player, this.players)){
+      this.players.push(player);
+      return true
+    }
+    return false
+  }
+  removePlayer(player: Player){
+    const index = this.players.indexOf(player);
+    if (index !== -1) {
+      this.players.splice(index, 1);
+    }
+  }
+  getPlayers(): Player[] {
+    let clone =Object.assign([],this.players);
+    return clone
+  }
+}

src/app/modal-rotations/modal-rotations.component.html

@@ -0,0 +1,73 @@
+  <div class="modal-header">
+    <h4 class="modal-title">{{ player.name }}</h4>
+    <button
+      type="button"
+      class="btn-close"
+      (click)="activeModal.dismiss()"
+      aria-label="Close"
+    ></button>
+  </div>
+  <div class="modal-body">
+    <form>
+      <div class="form-check">
+        <input
+          class="form-check-input"
+          type="checkbox"
+          [(ngModel)]="player.outside"
+          name="outside"
+          id="outside"
+        />
+        <label class="form-check-label" for="outside">Outside</label>
+      </div>
+      <div class="form-check">
+        <input
+          class="form-check-input"
+          type="checkbox"
+          [(ngModel)]="player.middle"
+          name="middle"
+          id="middle"
+        />
+        <label class="form-check-label" for="middle">Middle</label>
+      </div>
+      <div class="form-check">
+        <input
+          class="form-check-input"
+          type="checkbox"
+          [(ngModel)]="player.opposite"
+          name="opposite"
+          id="opposite"
+        />
+        <label class="form-check-label" for="opposite">Opposite</label>
+      </div>
+      <div class="form-check">
+        <input
+          class="form-check-input"
+          type="checkbox"
+          [(ngModel)]="player.setter"
+          name="setter"
+          id="setter"
+        />
+        <label class="form-check-label" for="setter">Setter</label>
+      </div>
+      <div class="form-check">
+        <input
+          class="form-check-input"
+          type="checkbox"
+          [(ngModel)]="player.libero"
+          name="libero"
+          id="libero"
+        />
+        <label class="form-check-label" for="libero">Libero</label>
+      </div>
+    </form>
+  </div>
+  <div class="modal-footer">
+    <button
+      type="button"
+      class="btn btn-primary"
+      (click)="savePlayer(); activeModal.close()"
+    >
+      Save
+    </button>
+  </div>
+

src/app/modal-rotations/modal-rotations.component.spec.ts

@@ -0,0 +1,23 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { ModalRotationsComponent } from './modal-rotations.component';
+
+describe('ModalRotationsComponent', () => {
+  let component: ModalRotationsComponent;
+  let fixture: ComponentFixture<ModalRotationsComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [ModalRotationsComponent]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(ModalRotationsComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/modal-rotations/modal-rotations.component.ts

@@ -0,0 +1,21 @@
+import { Component, Input } from '@angular/core';
+import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
+import { Player} from '../util/model';
+import { FormsModule } from '@angular/forms';
+
+@Component({
+  selector: 'app-modal-rotations',
+  imports: [FormsModule],
+  templateUrl: './modal-rotations.component.html',
+  styleUrl: './modal-rotations.component.less'
+})
+export class ModalRotationsComponent {
+ @Input() player!: Player;
+
+  constructor(public activeModal: NgbActiveModal) {}
+
+  savePlayer() {
+    // You can emit an event or handle the save logic here
+    this.activeModal.close(this.player);
+  }
+}

src/app/screen-basic/screen-basic.component.html

@@ -0,0 +1,42 @@
+  <div class="justify-content-md-center">
+    <div class="btn-toolbar mb-3 col justify-content-center" role="toolbar">
+    <div class="btn-group me-2" id="numTeamsSelector" role="group"
+      value="2">
+      <input value="2" [(ngModel)]="numTeamsSelectorValue" type="radio" class="btn-check" name="btnradio" id="btnradio1" autocomplete="off" checked>
+      <label class="btn btn-outline-primary" for="btnradio1">Two</label>
+
+      <input value="3" [(ngModel)]="numTeamsSelectorValue" type="radio" class="btn-check" name="btnradio" id="btnradio2" autocomplete="off">
+      <label class="btn btn-outline-primary" for="btnradio2">Three</label>
+
+      <input value="n" [(ngModel)]="numTeamsSelectorValue" type="radio" class="btn-check" name="btnradio" id="btnradio3" autocomplete="off">
+      <label class="btn btn-outline-primary" for="btnradio3">n</label>
+    </div>
+    <div *ngIf="numTeamsSelectorValue === 'n'" id="nTeamsText" class="col-md-auto">
+      <label for="nTeamsField">n Teams</label>
+      <input type="number" pattern="\d*" [(ngModel)]="nTeamsValue" id="nTeamsField" class="form-control" >
+    </div>
+  </div>
+    <h1>Random Teams</h1>
+
+  <form>
+  <button type="button" (click)="onButtonGenerate()" class="btn btn-primary">Generate</button>
+  </form>
+
+  <table class="table table-striped custom-table">
+    <thead>
+      <tr>
+        <th scope="col">Size</th>
+        <th scope="col">Names</th>
+      </tr>
+    </thead>
+    <tbody>
+      @for (team of data.teams; track $index) {
+        <tr>
+          <td style="text-wrap: wrap;">{{ team.length | number }}</td>
+          <td class="wrap-cell">{{ team }}</td>
+        </tr>
+      }
+    </tbody>
+  </table>
+
+</div>

src/app/screen-basic/screen-basic.component.spec.ts

@@ -0,0 +1,23 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { ScreenBasicComponent } from './screen-basic.component';
+
+describe('ScreenBasicComponent', () => {
+  let component: ScreenBasicComponent;
+  let fixture: ComponentFixture<ScreenBasicComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [ScreenBasicComponent]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(ScreenBasicComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/screen-basic/screen-basic.component.ts

@@ -0,0 +1,34 @@
+// Original Team Generation Screen for arbitrary size and number of teams
+import { Component, inject} from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+import { CommonModule } from '@angular/common';
+import { Player } from '../util/model';
+import { assignPlayersRandomly, iter } from '../util/util';
+import { DataService } from '../data.service';
+
+@Component({
+  selector: 'app-screen-basic',
+  imports: [NgbModule, CommonModule, FormsModule],
+  templateUrl: './screen-basic.component.html',
+  styleUrl: './screen-basic.component.less'
+})
+export class ScreenBasicComponent {
+  data = inject(DataService);
+  numTeamsSelectorValue = "2";
+  numTeamsSelected = 2;
+  nTeamsValue = "4";
+  
+  onButtonGenerate(): void{
+    if(this.numTeamsSelectorValue === 'n'){
+      this.numTeamsSelected  = Number(this.nTeamsValue);
+    }
+    else{
+      this.numTeamsSelected = Number(this.numTeamsSelectorValue);
+    }
+    
+    let teams: Player[][]= Array.from({ length: this.numTeamsSelected }, () => []);
+    this.data.teams = assignPlayersRandomly(this.data.getPlayers(),teams);
+  }
+
+}

src/app/screen-edit/screen-edit.component.html

@@ -0,0 +1,36 @@
+<div class="justify-content-md-center">
+  <h1>Players: {{ data.getPlayers().length }}</h1>
+  <div class="input-group mb-3">
+    <input
+      type="text"
+      [(ngModel)]="newItem"
+      class="form-control"
+      placeholder="Enter a name..."
+      (keyup.enter)="addItem()"
+    />
+    <button class="btn btn-primary" type="button" (click)="addItem()" >
+      <i class="bi bi-plus-lg"></i> Add
+    </button>
+  </div>
+  @if (alertMessage) {
+	<ngb-alert #selfClosingAlert type="danger" (closed)="alertMessage = ''">{{ alertMessage }}</ngb-alert>
+    }
+<div class="container mt-4">
+  <ul class="list-group mb-3">
+      @for (player of data.getPlayers(); track $index) {
+        <li class="list-group-item d-flex justify-content-between">
+            <div (click)="openPlayerModal(player)" class="player-content">
+              <div class="text-start">{{ player.name }}</div>
+              <div class="text-end">{{ player.getRoles() }}</div>
+            </div>
+            <button (click)="removeItem(player)" class="btn btn-secondary btn-sm p-0 ms-2" style="width: 24px; height: 24px" >
+              <i class="bi bi-x"></i>
+            </button>
+        </li>
+      }
+  </ul>
+
+</div>
+
+
+</div>

src/app/screen-edit/screen-edit.component.less

@@ -0,0 +1,7 @@
+.player-content{
+    cursor: pointer;
+    flex-grow: 1;
+    text-align: left;
+    display: flex;
+    justify-content: space-between;
+}

src/app/screen-edit/screen-edit.component.spec.ts

@@ -0,0 +1,23 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { ScreenEditComponent } from './screen-edit.component';
+
+describe('ScreenEditComponent', () => {
+  let component: ScreenEditComponent;
+  let fixture: ComponentFixture<ScreenEditComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [ScreenEditComponent]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(ScreenEditComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/screen-edit/screen-edit.component.ts

@@ -0,0 +1,67 @@
+import { Component, inject, Input, ViewChild } from '@angular/core';
+import { NgbAlert, NgbModal } from '@ng-bootstrap/ng-bootstrap';
+import { Player } from '../util/model';
+import { ModalRotationsComponent } from '../modal-rotations/modal-rotations.component';
+import { FormsModule } from '@angular/forms';
+import { Subject } from 'rxjs/internal/Subject';
+import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
+import { debounceTime, tap } from 'rxjs/operators';
+import { DataService } from '../data.service';
+
+@Component({
+  selector: 'app-screen-edit',
+  imports: [FormsModule, NgbAlert],
+  templateUrl: './screen-edit.component.html',
+  styleUrl: './screen-edit.component.less'
+})
+export class ScreenEditComponent {
+  data = inject(DataService);
+  @ViewChild('selfClosingAlert', { static: false })selfClosingAlert!: NgbAlert;
+  private _message$ = new Subject<string>();
+  newItem: string = "";
+  alertMessage = '';
+
+  constructor(private modalService: NgbModal) {
+    this._message$
+			.pipe(
+				takeUntilDestroyed(),
+				tap((message) => (this.alertMessage = message)),
+				debounceTime(5000),
+			)
+			.subscribe(() => this.selfClosingAlert?.close());
+  }
+
+  addItem() {
+    const name = this.newItem.trim()
+    if (name) {
+      let newPlayer = new Player(name);
+      if(this.data.addPlayer(newPlayer)){
+        this.newItem = '';
+        return
+      }
+      else{
+        this.setAlertMessage(newPlayer.name);
+      }
+    }
+  }
+  removeItem(player: Player){
+    this.data.removePlayer(player);
+  }
+
+  openPlayerModal(player: Player){
+    const modalRef = this.modalService.open(ModalRotationsComponent);
+    modalRef.componentInstance.player = player;
+    /*
+    modalRef.result.then((updatedPlayer) => {
+      // Handle the updated player data if needed
+      console.log('Player updated:', updatedPlayer);
+    }).catch((error) => {
+      console.log('Modal dismissed');
+    });
+    */
+  }
+  public setAlertMessage(s: string) {
+		this._message$.next(`"${s}" already exists. Please choose a unique name.`);
+	}
+
+}

src/app/screen-rotations/screen-rotations.component.html

@@ -0,0 +1,93 @@
+<div class="justify-content-md-center">
+<h1>Rotations</h1>
+<form>
+	<button type="button" (click)="generateTeams()" class="btn btn-primary mb-3">Generate</button>
+</form>
+
+<div ngbAccordion>
+	<div ngbAccordionItem [collapsed]="false">
+		<h2 ngbAccordionHeader>
+			<button ngbAccordionButton>Libero: {{ LiberoPlayers.length }}</button>
+		</h2>
+		<div ngbAccordionCollapse>
+			<div ngbAccordionBody>
+				<ng-template>
+          @for (player of LiberoPlayers; track $index) {
+            {{ player.name }}
+          }
+				</ng-template>
+			</div>
+		</div>
+	</div>
+	<div ngbAccordionItem>
+		<h2 ngbAccordionHeader>
+			<button ngbAccordionButton>Setter: {{ SetterPlayers.length }}</button>
+		</h2>
+		<div ngbAccordionCollapse>
+			<div ngbAccordionBody>
+				<ng-template>
+          @for (player of SetterPlayers; track $index) {
+            {{ player.name }}
+          }
+				</ng-template>
+			</div>
+		</div>
+	</div>
+	<div ngbAccordionItem>
+		<h2 ngbAccordionHeader>
+			<button ngbAccordionButton>Opposite: {{ OppositePlayers.length }}</button>
+		</h2>
+		<div ngbAccordionCollapse>
+			<div ngbAccordionBody>
+				<ng-template>
+          @for (player of OppositePlayers; track $index) {
+            {{ player.name }}
+          }
+				</ng-template>
+			</div>
+		</div>
+	</div>
+	<div ngbAccordionItem>
+		<h2 ngbAccordionHeader>
+			<button ngbAccordionButton>Middle: {{ MiddlePlayers.length }}</button>
+		</h2>
+		<div ngbAccordionCollapse>
+			<div ngbAccordionBody>
+				<ng-template>
+          @for (player of MiddlePlayers; track $index) {
+            {{ player.name }}
+          }
+				</ng-template>
+			</div>
+		</div>
+	</div>
+	<div ngbAccordionItem>
+		<h2 ngbAccordionHeader>
+			<button ngbAccordionButton>Outside: {{ OutsidePlayers.length}}</button>
+		</h2>
+		<div ngbAccordionCollapse>
+			<div ngbAccordionBody>
+				<ng-template>
+          @for (player of OutsidePlayers; track $index) {
+            {{ player.name }}
+          }
+				</ng-template>
+			</div>
+		</div>
+	</div>
+	<div ngbAccordionItem>
+		<h2 ngbAccordionHeader>
+			<button ngbAccordionButton>No Role: {{ NoRolePlayers.length }}</button>
+		</h2>
+		<div ngbAccordionCollapse>
+			<div ngbAccordionBody>
+				<ng-template>
+          @for (player of NoRolePlayers; track $index) {
+            {{ player.name }}
+          }
+				</ng-template>
+			</div>
+		</div>
+	</div>
+  </div>
+</div>

src/app/screen-rotations/screen-rotations.component.spec.ts

@@ -0,0 +1,23 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { ScreenRotationsComponent } from './screen-rotations.component';
+
+describe('ScreenRotationsComponent', () => {
+  let component: ScreenRotationsComponent;
+  let fixture: ComponentFixture<ScreenRotationsComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [ScreenRotationsComponent]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(ScreenRotationsComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/screen-rotations/screen-rotations.component.ts

@@ -0,0 +1,44 @@
+// Team Generation Screen respecting volleyball roles as defined by `../model/Player`
+import { Component, inject } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { Player } from '../util/model';
+import { NgbAccordionBody, NgbAccordionCollapse, NgbAccordionHeader, NgbAccordionItem, NgbAccordionButton, NgbAccordionDirective, NgbAccordionToggle } from '@ng-bootstrap/ng-bootstrap';
+import { DataService } from '../data.service';
+import { solveRotations } from '../util/solver';
+
+@Component({
+  selector: 'app-screen-rotations',
+  imports: [FormsModule, NgbAccordionButton, NgbAccordionDirective, NgbAccordionItem, NgbAccordionHeader, NgbAccordionToggle, NgbAccordionBody, NgbAccordionCollapse,],
+  templateUrl: './screen-rotations.component.html',
+  styleUrl: './screen-rotations.component.less'
+})
+export class ScreenRotationsComponent{
+  data = inject(DataService);
+
+  async generateTeams(){
+    const teamCount = Math.floor(this.data.getPlayers().length / 6);
+    solveRotations();
+
+  }
+
+  get OutsidePlayers(): Player[] {
+    return this.data.getPlayers().filter(player => player.outside);
+  }
+  get MiddlePlayers(): Player[] {
+    return this.data.getPlayers().filter(player => player.middle);
+  }
+  get OppositePlayers(): Player[] {
+    return this.data.getPlayers().filter(player => player.opposite);
+  }
+  get SetterPlayers(): Player[] {
+    return this.data.getPlayers().filter(player => player.setter);
+  }
+  get LiberoPlayers(): Player[] {
+    return this.data.getPlayers().filter(player => player.libero);
+  }
+  get NoRolePlayers(): Player[] {
+    return this.data.getPlayers().filter(
+      player => !player.outside && !player.middle && !player.opposite && !player.setter && !player.libero
+      );
+  }
+}

src/app/util/model.ts

@@ -0,0 +1,47 @@
+export class Player{
+  name: string;
+  outside: boolean;
+  middle: boolean;
+  opposite: boolean; // dia
+  setter: boolean;
+  libero: boolean;
+
+  constructor(
+    name:string, 
+    outside: boolean = false,
+    middle: boolean = false,
+    opposite: boolean = false, // dia
+    setter: boolean = false,
+    libero: boolean = false,
+  ){
+    this.name = name;
+    this.outside = outside;
+    this.middle = middle;
+    this.opposite = opposite;
+    this.setter = setter;
+    this.libero = libero;
+  }
+  getRoles(): string[] {
+    const roles = [];
+    if (this.outside){roles.push('OH')}
+    if (this.middle){roles.push('M')}
+    if (this.opposite){roles.push('OPP')}
+    if (this.setter){roles.push('S')}
+    if (this.libero){roles.push('L')}
+    return roles;
+  }
+  
+  toString(): string{
+    return this.name;
+  }
+  static deSerialize(name: string, values: string): Player{
+    return new Player(name);
+  }
+  static isNew(newplayer:Player, players: Player[]): boolean {
+  const seen = new Set<string>(players.map(p => p.name));
+  if (seen.has(newplayer.name)){
+    return false
+  }
+  return true
+}
+}

src/app/util/rotations.pl

@@ -0,0 +1,44 @@
+  % https://de.wikipedia.org/wiki/Volleyball#Spielpositionen
+  % we want 2 outside, 1 opp, 1 set and either 2*middle or middle + libero
+teams(0).
+number_of_teams(X,Result):- Result is floor(X/6).
+libero(tom).
+libero(anh).
+
+:-style_check(-discontiguous).
+
+players(_/X):- X=:=1.
+% introduce abbreviations used for s(etter), oh (outside hitter), opp(osite), l(ibero), m(iddle)
+s(_) :- member(1, [0]).
+oh(_) :- member(1, [0]).
+opp(_) :- member(1, [0]).
+l(_) :- member(1, [0]).
+m(_) :- member(1, [0]).
+
+team(List):-
+    findall(X, (member(X, List),s(X)),Setters),
+        length(Setters,1),
+    findall(X, (member(X, List),oh(X)),Outsides),
+        length(Outsides,2),
+    findall(X, (member(X, List),opp(X)),Opposites),
+        length(Opposites,1),
+    % require either 2 middles or 1+1 libero.
+    (findall(X, (member(X, List),m(X)),Middles),
+        length(Middles, 2)
+    ;
+        (findall(X, (member(X, List),m(X)),Middles),
+            length(Middles,1),
+        findall(X, (member(X,List), l(X)),Liberos),
+            length(Liberos,1)
+        )
+    ).
+            % TODO require all sets to be A∩B = ∅ 
+
+
+
+s(s).
+oh(oh).
+oh(oh2).
+opp(opp).
+l(l).
+m(m).

src/app/util/solver.ts

@@ -0,0 +1,11 @@
+import  SWIPL  from 'swipl-wasm';
+
+export async function solveRotations(){
+    const swipl = await SWIPL({ arguments: ["-q"] });
+    const q = swipl.prolog.query("member(X, [a, b, c]).").once() as PrologResult;
+    console.log(q.X);
+}
+
+interface PrologResult {
+  X: string;
+}

src/app/util/util.ts

@@ -0,0 +1,21 @@
+import { Player } from "./model";
+
+export function* iter(list: any[]){
+    let index = 0;
+    while(true){
+        yield list[index % list.length];
+        index++;
+    }
+}
+export function assignPlayersRandomly(players: Player[], teams: Player[][]){
+    let nameslen = players.length;
+    let iterator = iter(teams);
+    for(let i =0; i < nameslen; i++){
+        let index = Math.floor(Math.random()* players.length);
+        let n = players[index];
+        players.splice(index,1);
+        let team = iterator.next().value;
+        team.push(n);
+    }
+    return teams;
+}

src/styles.less

@@ -9,7 +9,7 @@ html, body {
 body {
     margin:3em auto;
     font-family: Roboto, "Helvetica Neue", sans-serif;
-    padding:0 .5em;
+    padding:.5em auto;
 }
 h1,h2,h3{
     line-height:1.2;