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

@@ -1,5 +1,16 @@
 <main class="main">
-<app-screen-rotations [players]="players"></app-screen-rotations>
+    <router-outlet></router-outlet>
 </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

@@ -1,34 +1,45 @@
-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 { ScreenBasicComponent } from "./screen-basic/screen-basic.component";
+import { Player } from './util/model';
-import { ScreenRotationsComponent } from './screen-rotations/screen-rotations.component';
+import { DataService } from './data.service';
-import { Player } from './model';
-import { ScreenEditComponent } from './screen-edit/screen-edit.component';
 
 @Component({
   selector: 'app-root',
-  imports: [NgbModule, RouterOutlet, CommonModule, FormsModule, ScreenBasicComponent, ScreenRotationsComponent, ScreenEditComponent],
+  imports: [NgbModule, RouterOutlet, CommonModule, FormsModule, RouterLink],
   templateUrl: './app.component.html',
   styleUrl: './app.component.less'
 })
 export class AppComponent implements OnInit {
   title = 'vb';
-  players : Player[] = [];
+  data = inject(DataService);
+  activeId = '/';
 
-  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 => {
       if (params['names']){
-        this.players = params['names'].split(',').map((name: string) => new Player(name));
+        this.data.setPlayers(
+          params['names'].split(',').map((name: string) => new Player(name))
+        );
       }
     });
   }

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.ts

@@ -1,6 +1,6 @@
 import { Component, Input } from '@angular/core';
 import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
-import { Player} from '../model';
+import { Player} from '../util/model';
 import { FormsModule } from '@angular/forms';
 
 @Component({

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

@@ -30,7 +30,7 @@
       </tr>
     </thead>
     <tbody>
-      @for (team of teamsArray; track $index) {
+      @for (team of data.teams; track $index) {
         <tr>
           <td style="text-wrap: wrap;">{{ team.length | number }}</td>
           <td class="wrap-cell">{{ team }}</td>

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

@@ -1,24 +1,23 @@
 // Original Team Generation Screen for arbitrary size and number of teams
-import { Component, Input, OnInit} from '@angular/core';
+import { Component, inject} from '@angular/core';
 import { FormsModule } from '@angular/forms';
-import { RouterOutlet, ActivatedRoute } from '@angular/router';
 import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
 import { CommonModule } from '@angular/common';
-import { Player } from '../model';
+import { Player } from '../util/model';
-import { iter } from '../util';
+import { assignPlayersRandomly, iter } from '../util/util';
+import { DataService } from '../data.service';
 
 @Component({
   selector: 'app-screen-basic',
-  imports: [NgbModule, RouterOutlet, CommonModule, FormsModule],
+  imports: [NgbModule, CommonModule, FormsModule],
   templateUrl: './screen-basic.component.html',
   styleUrl: './screen-basic.component.less'
 })
 export class ScreenBasicComponent {
-  @Input() players!: Player[];
+  data = inject(DataService);
   numTeamsSelectorValue = "2";
   numTeamsSelected = 2;
   nTeamsValue = "4";
-  teamsArray: string[][] = [];
   
   onButtonGenerate(): void{
     if(this.numTeamsSelectorValue === 'n'){
@@ -28,21 +27,8 @@ export class ScreenBasicComponent {
       this.numTeamsSelected = Number(this.numTeamsSelectorValue);
     }
     
-    let teams = Array.from({ length: this.numTeamsSelected }, () => []);
+    let teams: Player[][]= Array.from({ length: this.numTeamsSelected }, () => []);
-    // clone array here
+    this.data.teams = assignPlayersRandomly(this.data.getPlayers(),teams);
-    let localPlayers: Player[] = Object.assign([],this.players);
-
-    let nameslen = localPlayers.length;
-    let iterator = iter(teams);
-    for(let i =0; i < nameslen; i++){
-        let index = Math.floor(Math.random()* localPlayers.length);
-        let n = localPlayers[index];
-        localPlayers.splice(index,1);
-        let team = iterator.next().value;
-        team.push(n.name);
-
-    }
-    this.teamsArray = teams;
   }
 
 }

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

@@ -1,5 +1,5 @@
 <div class="justify-content-md-center">
-  <h1>Players: {{ players.length }}</h1>
+  <h1>Players: {{ data.getPlayers().length }}</h1>
   <div class="input-group mb-3">
     <input
       type="text"
@@ -17,9 +17,15 @@
     }
 <div class="container mt-4">
   <ul class="list-group mb-3">
-      @for (player of players; track $index) {
+      @for (player of data.getPlayers(); track $index) {
-        <li class="list-group-item">
+        <li class="list-group-item d-flex justify-content-between">
-            <a (click)="openPlayerModal(player)" style="display: block; cursor: pointer;">{{ player.name }}</a>
+            <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>

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.ts

@@ -1,11 +1,12 @@
-import { Component, Input, ViewChild } from '@angular/core';
+import { Component, inject, Input, ViewChild } from '@angular/core';
 import { NgbAlert, NgbModal } from '@ng-bootstrap/ng-bootstrap';
-import { Player } from '../model';
+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',
@@ -14,7 +15,7 @@ import { debounceTime, tap } from 'rxjs/operators';
   styleUrl: './screen-edit.component.less'
 })
 export class ScreenEditComponent {
-  @Input() players!: Player[];
+  data = inject(DataService);
   @ViewChild('selfClosingAlert', { static: false })selfClosingAlert!: NgbAlert;
   private _message$ = new Subject<string>();
   newItem: string = "";
@@ -34,15 +35,18 @@ export class ScreenEditComponent {
     const name = this.newItem.trim()
     if (name) {
       let newPlayer = new Player(name);
-      if (Player.isNew(newPlayer, this.players)){
+      if(this.data.addPlayer(newPlayer)){
-        this.players.push(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);

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

@@ -1,65 +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>
+	<div ngbAccordionItem [collapsed]="false">
-    <h2 ngbAccordionHeader>
+		<h2 ngbAccordionHeader>
-      <button ngbAccordionButton>Outside</button>
+			<button ngbAccordionButton>Libero: {{ LiberoPlayers.length }}</button>
-    </h2>
+		</h2>
-    <div ngbAccordionCollapse>
+		<div ngbAccordionCollapse>
-      <div ngbAccordionBody>
+			<div ngbAccordionBody>
-          @for (player of outsidePlayers; track $index) {
+				<ng-template>
+          @for (player of LiberoPlayers; track $index) {
             {{ player.name }}
           }
-      </div>
+				</ng-template>
-    </div>
+			</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>
+</div>
-<div ngbAccordion>
-  <div ngbAccordionItem>
-    <h2 ngbAccordionHeader>
-      <button ngbAccordionButton>Middle</button>
-    </h2>
-    <div ngbAccordionCollapse>
-      <div ngbAccordionBody>
-        <ng-template>Content for the first item</ng-template>
-      </div>
-    </div>
-  </div>
-</div>
-<div ngbAccordion>
-  <div ngbAccordionItem>
-    <h2 ngbAccordionHeader>
-      <button ngbAccordionButton>Opposite</button>
-    </h2>
-    <div ngbAccordionCollapse>
-      <div ngbAccordionBody>
-        <ng-template>Content for the first item</ng-template>
-      </div>
-    </div>
-  </div>
-</div>
-<div ngbAccordion>
-  <div ngbAccordionItem>
-    <h2 ngbAccordionHeader>
-      <button ngbAccordionButton>Setter</button>
-    </h2>
-    <div ngbAccordionCollapse>
-      <div ngbAccordionBody>
-        <ng-template>Content for the first item</ng-template>
-      </div>
-    </div>
-  </div>
-</div>
-<div ngbAccordion>
-  <div ngbAccordionItem>
-    <h2 ngbAccordionHeader>
-      <button ngbAccordionButton>Libero</button>
-    </h2>
-    <div ngbAccordionCollapse>
-      <div ngbAccordionBody>
-        <ng-template>Content for the first item</ng-template>
-      </div>
-    </div>
-  </div>
-</div>
-</div>

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

@@ -1,8 +1,10 @@
 // Team Generation Screen respecting volleyball roles as defined by `../model/Player`
-import { Component, Input } from '@angular/core';
+import { Component, inject } from '@angular/core';
 import { FormsModule } from '@angular/forms';
-import { Player } from '../model';
+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',
@@ -10,21 +12,33 @@ import { NgbAccordionBody, NgbAccordionCollapse, NgbAccordionHeader, NgbAccordio
   templateUrl: './screen-rotations.component.html',
   styleUrl: './screen-rotations.component.less'
 })
-export class ScreenRotationsComponent {
+export class ScreenRotationsComponent{
-  @Input() players!: Player[];
+  data = inject(DataService);
-  get outsidePlayers(): Player[] {
+
-    return this.players.filter(player => !player.outside);
+  async generateTeams(){
+    const teamCount = Math.floor(this.data.getPlayers().length / 6);
+    solveRotations();
+
   }
-  get middlePlayers(): Player[] {
+
-    return this.players.filter(player => player.middle);
+  get OutsidePlayers(): Player[] {
+    return this.data.getPlayers().filter(player => player.outside);
   }
-  get oppositePlayers(): Player[] {
+  get MiddlePlayers(): Player[] {
-    return this.players.filter(player => player.opposite);
+    return this.data.getPlayers().filter(player => player.middle);
+  }
+  get OppositePlayers(): Player[] {
+    return this.data.getPlayers().filter(player => player.opposite);
   }
   get SetterPlayers(): Player[] {
-    return this.players.filter(player => player.setter);
+    return this.data.getPlayers().filter(player => player.setter);
   }
   get LiberoPlayers(): Player[] {
-    return this.players.filter(player => player.libero);
+    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.ts

@@ -1,7 +0,0 @@
-export function* iter(list: any[]){
-    let index = 0;
-    while(true){
-        yield list[index % list.length];
-        index++;
-    }
-}

src/app/util/model.ts

@@ -21,12 +21,17 @@ export class Player{
     this.setter = setter;
     this.libero = libero;
   }
-  serialize(): string[] {
+  getRoles(): string[] {
-    const values = 'OOOO'
+    const roles = [];
-    return [this.name, values];
+    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;
   }
   
-  valueOf(): string{
+  toString(): string{
     return this.name;
   }
   static deSerialize(name: string, values: string): Player{

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;