.gitea/workflows/build-Frontend-a.yml

@@ -1,12 +1,84 @@
-name: Build & Push Frontend A
+name: Build, Test & Push Frontend
+run-name: ${{ gitea.actor }} build and test Angular 🚀
+
 on:
   push:
     branches:
       - main
+  pull_request:
+    branches:
+      - main
 
 jobs:
-  docker:
+  # ------------------------------------------------------------------
+  # JOB 1: Code integrity and quality gates (CI)
+    # ------------------------------------------------------------------
+  quality-check:
     runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+
+      - name: Install Linux Libs
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            libnss3 \
+            libnspr4 \
+            libatk1.0-0 \
+            libatk-bridge2.0-0 \
+            libcups2t64 \
+            libdrm2 \
+            libxkbcommon0 \
+            libxcomposite1 \
+            libxdamage1 \
+            libxfixes3 \
+            libxrandr2 \
+            libgbm1 \
+            libasound2t64 \
+            libpango-1.0-0 \
+            libcairo2
+
+      - name: Install Dependencies
+        run: npm ci
+
+      # 1. Linting (Code-Style)
+      - name: Lint & Type Check
+        run: npm run lint --if-present
+
+      # 2. Unit Tests (Logik) Not necessary, because atm no tests written
+      #- name: Unit Tests
+      #  run: npx ng test --watch=false --browsers=ChromeHeadless
+
+      # 3. Build Production (necessary for lighthouse)      
+      - name: Build Production
+        run: npx ng build --configuration production
+
+      # 4. Lighthouse Audit (Performance & SEO)
+      - name: Install Puppeteer
+        run: npm install puppeteer --no-save
+      
+      - name: Lighthouse CI
+        run: |
+          CHROME_PATH=$(node -e 'console.log(require("puppeteer").executablePath())')                    
+          export CHROME_PATH=$CHROME_PATH                    
+          npx lhci autorun
+
+  # ------------------------------------------------------------------
+  # JOB 2: Docker Build & Push (CD)
+  # Runs only if 'quality-check' are successfully and we are on branch main.
+  # ------------------------------------------------------------------
+  docker:
+    needs: quality-check
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+
     steps:
       - uses: actions/checkout@v4
 
@@ -36,8 +108,7 @@ jobs:
             docker.io/${{ secrets.DOCKERHUB_USERNAME }}/playground:frontend-a-${{ steps.prep.outputs.branch }}
             docker.io/${{ secrets.DOCKERHUB_USERNAME }}/playground:frontend-a-${{ steps.prep.outputs.branch }}-${{ steps.prep.outputs.sha }}
 
-      - name: Also push moving main tag (only on main)
-        if: ${{ github.ref == 'refs/heads/main' }}
+      - name: Also push moving main tag
         uses: docker/build-push-action@v6
         with:
           context: .

.gitignore

@@ -41,3 +41,6 @@ __screenshots__/
 # System files
 .DS_Store
 Thumbs.db
+
+# Lighthouse
+.lighthouseci/

eslint.config.js

@@ -15,6 +15,8 @@ module.exports = defineConfig([
     ],
     processor: angular.processInlineTemplates,
     rules: {
+      "@typescript-eslint/no-inferrable-types": "off",
+      "@typescript-eslint/no-explicit-any": "off",
       "@angular-eslint/directive-selector": [
         "error",
         {

lighthouserc.json

@@ -0,0 +1,14 @@
+{
+  "ci": {
+    "collect": {
+      "numberOfRuns": 1,
+      "staticDistDir": "./dist/playground-frontend/browser",
+      "settings": {
+        "chromeFlags": "--no-sandbox --headless --disable-gpu --disable-dev-shm-usage"
+      }
+    },
+    "upload": {
+      "target": "temporary-public-storage"
+    }
+  }
+}

package.json

@@ -30,6 +30,7 @@
     "@angular/build": "~21.1.0",
     "@angular/cli": "~21.1.0",
     "@angular/compiler-cli": "~21.1.0",
+    "@lhci/cli": "~0.15.1",
     "@types/jasmine": "~5.1.15",
     "angular-eslint": "21.2.0",
     "eslint": "^9.39.2",

src/app/pages/algorithms/conway-gol/conway-gol.html

@@ -33,6 +33,7 @@
             <mat-icon>play_arrow</mat-icon> {{ 'GOL.START' | translate }}
           </button>
         }
+        <p>{{ 'SORTING.EXECUTION_TIME' | translate }}: {{ executionTime }} ms</p>
       </div>
       <div class="grid-size">
         <mat-form-field appearance="outline" class="grid-field">
@@ -69,6 +70,7 @@
               (keyup.enter)="applySpeed()"
             />
         </mat-form-field>
+
       </div>
       <div class="legend">
         <span><span class="legend-color alive"></span> {{ 'GOL.ALIVE' | translate }}</span>
@@ -84,7 +86,8 @@
       [createNodeFn]="createConwayNode"
       [getNodeColorFn]="getConwayNodeColor"
       [applySelectionFn]="applyConwaySelection"
-      (gridChange)="grid = $event"
+      [backgroundColor]="'lightgray'"
+      (gridChange)="readGrid = $event"
     ></app-generic-grid>
   </mat-card-content>
 </mat-card>

src/app/pages/algorithms/conway-gol/conway-gol.models.ts

@@ -16,7 +16,7 @@ export const DEFAULT_GRID_ROWS = 50;
 export const DEFAULT_GRID_COLS = 50;
 
 export const MIN_GRID_SIZE = 20;
-export const MAX_GRID_SIZE = 100;
+export const MAX_GRID_SIZE = 200;
 export const DEFAULT_TIME_PER_GENERATION = 30;
 
 export const MIN_TIME_PER_GENERATION = 20;

src/app/pages/algorithms/conway-gol/conway-gol.ts

@@ -54,7 +54,9 @@ export class ConwayGol implements AfterViewInit {
   protected readonly MAX_GRID_SIZE = MAX_GRID_SIZE;
   protected readonly MAX_GRID_PX = MAX_GRID_PX;
 
-  grid: Node[][] = [];
+  readGrid: Node[][] = [];
+  writeGrid: Node[][] = [];
+  executionTime = 0;
   currentScenario: Scenario = Scenario.SIMPLE;
   readonly gameStarted  = signal(false);
 
@@ -96,45 +98,42 @@ export class ConwayGol implements AfterViewInit {
   };
 
   getConwayNodeColor = (node: Node): string => {
-    if (node.alive) {
-      return 'black';
-    }
-    return 'lightgray';
+    return node.alive ? 'black' : 'lightgray';
   };
 
   applyConwaySelection = (pos: GridPos, grid: Node[][]): void => {
-    this.grid = grid; // Keep internal grid in sync
+    this.readGrid = grid; // Keep internal grid in sync
     const node = grid[pos.row][pos.col];
     node.alive = !node.alive; // Toggle alive status
   };
 
   initializeConwayGrid = (grid: Node[][]): void => {
     this.gameStarted.set(false);
-    this.grid = grid;
-
+    this.readGrid = grid;
     switch(this.currentScenario) {
       case Scenario.RANDOM: this.setupRandomLives(); break;
       case Scenario.SIMPLE: this.setupSimpleLive(); break;
       case Scenario.PULSAR: this.setupPulsar(); break;
       case Scenario.GUN:    this.setupGliderGun(); break;
     }
+    this.writeGrid = structuredClone(this.readGrid);
   };
 
   // --- Conway-specific logic (kept local) ---
   setupRandomLives(): void {
     for (let row = 0; row < this.gridRows; row++) {
       for (let col = 0; col < this.gridCols; col++) {
-        this.grid[row][col].alive = Math.random() <= LIVE_SPAWN_PROBABILITY;
+        this.readGrid[row][col].alive = Math.random() <= LIVE_SPAWN_PROBABILITY;
       }
     }
   }
 
   setupSimpleLive(): void {
-    this.grid[3][4].alive = true;
-    this.grid[4][5].alive = true;
-    this.grid[5][3].alive = true;
-    this.grid[5][4].alive = true;
-    this.grid[5][5].alive = true;
+    this.readGrid[3][4].alive = true;
+    this.readGrid[4][5].alive = true;
+    this.readGrid[5][3].alive = true;
+    this.readGrid[5][4].alive = true;
+    this.readGrid[5][5].alive = true;
   }
 
   setupPulsar(): void {
@@ -181,39 +180,44 @@ export class ConwayGol implements AfterViewInit {
     this.gameStarted.set(true);
     let lifeIsDead = false;
     while (this.gameStarted()){
-      let gridClone = structuredClone(this.grid);
+      const startTime = performance.now();
       lifeIsDead = true;
       for (let row = 0; row < this.gridRows; row++) {
         for (let col = 0; col < this.gridCols; col++) {
-          lifeIsDead = this.checkLifeRules(row, col, gridClone, lifeIsDead);
+          lifeIsDead = this.checkLifeRules(row, col, this.writeGrid) && lifeIsDead;
         }
       }
 
-      this.swapGrid(gridClone);
+      this.swapGrids();
+      const endTime = performance.now();
+      this.executionTime = Number.parseFloat((endTime - startTime).toFixed(4));
       if (lifeIsDead){
         this.gameStarted.set(false);
       }
-      await this.delay(this.lifeSpeed);
+      const delta = Math.max(this.lifeSpeed - this.executionTime, 0);
+      await this.delay(delta);
     }
+    this.executionTime = 0;
   }
 
-  private checkLifeRules(row: number, col: number, gridClone: Node[][], lifeIsDead: boolean) {
-    const itsMe = this.grid[row][col];
-    let aliveNeighbors = this.howManyNeighborsAreLiving(row, col);
-    if (itsMe.alive && (aliveNeighbors < 2 || aliveNeighbors > 3)) {
-      gridClone[row][col].alive = false;
-      lifeIsDead = false;
-    } else if (!itsMe.alive && aliveNeighbors === 3) {
-      gridClone[row][col].alive = true;
-      lifeIsDead = false;
-    }
-    return lifeIsDead;
+  private checkLifeRules(row: number, col: number, writeGrid: Node[][]): boolean {
+    const currentCell = this.readGrid[row][col];
+    const aliveNeighbors = this.howManyNeighborsAreLiving(row, col);
+    const oldLifeState = currentCell.alive;
+
+    const nextStateAlive = (currentCell.alive && (aliveNeighbors === 2 || aliveNeighbors === 3)) || (!currentCell.alive && aliveNeighbors === 3);
+    writeGrid[row][col].alive = nextStateAlive;
+
+    //only if at least one cell changes the game is still alive
+    return (nextStateAlive == oldLifeState);
   }
 
-  private swapGrid(gridClone: Node[][]) {
-    this.grid = gridClone;
+  private swapGrids() {
+    const tmp = this.readGrid;
+    this.readGrid = this.writeGrid;
+    this.writeGrid = tmp;
     if (this.genericGridComponent) {
-      this.genericGridComponent.grid = this.grid;
+      this.genericGridComponent.grid = this.readGrid;
       this.genericGridComponent.drawGrid();
     }
   }
@@ -231,7 +235,7 @@ export class ConwayGol implements AfterViewInit {
         if (nRow == row && nCol == col) {
           continue;
         }
-        if (this.grid[nRow][nCol].alive) {
+        if (this.readGrid[nRow][nCol].alive) {
           aliveNeighborCount++;
         }
       }
@@ -250,7 +254,7 @@ export class ConwayGol implements AfterViewInit {
 
   private setAlive(r: number, c: number): void {
     if (r >= 0 && r < this.gridRows && c >= 0 && c < this.gridCols) {
-      this.grid[r][c].alive = true;
+      this.readGrid[r][c].alive = true;
     }
   }
 }

src/app/pages/algorithms/pathfinding/pathfinding.component.html

@@ -73,6 +73,7 @@
       [createNodeFn]="createPathfindingNode"
       [getNodeColorFn]="getPathfindingNodeColor"
       [applySelectionFn]="applyPathfindingSelection"
+      [backgroundColor]="'lightgray'"
       (gridChange)="grid = $event"
     ></app-generic-grid>
   </mat-card-content>

src/app/pages/algorithms/sorting/sorting.component.ts

@@ -136,7 +136,6 @@ export class SortingComponent implements OnInit {
     const endTime = performance.now();
     this.executionTime = Number.parseFloat((endTime - startTime).toFixed(4));
 
-    console.log(snapshots.length);
     this.animateSorting(snapshots);
   }
 

src/app/shared/components/generic-grid/generic-grid.ts

@@ -21,6 +21,7 @@ export class GenericGridComponent implements AfterViewInit {
   @Input() minGridSize: number = 5;
   @Input() maxGridSize: number = 50;
   @Input() drawNodeBorderColor: string = '#ccc';
+  @Input() backgroundColor: string = 'lightgray';
 
   // Callbacks from parent component
   @Input() createNodeFn!: (row: number, col: number) => any;
@@ -99,19 +100,70 @@ export class GenericGridComponent implements AfterViewInit {
   }
 
   drawGrid(): void {
-    this.ctx.clearRect(0, 0, this.canvas.nativeElement.width, this.canvas.nativeElement.height);
+    if (!this.ctx || !this.grid.length) return;
+
+    const width = this.canvas.nativeElement.width;
+    const height = this.canvas.nativeElement.height;
+    const size = this.nodeSize;
+
+    this.ctx.fillStyle = this.backgroundColor;
+    this.ctx.fillRect(0, 0, width, height);
+    this.ctx.fillStyle = 'black';
+
     for (let row = 0; row < this.gridRows; row++) {
       for (let col = 0; col < this.gridCols; col++) {
-        this.drawNode(this.grid[row][col]);
+        const node = this.grid[row][col];
+
+        const color = this.getNodeColorFn(node);
+
+        if (color !== this.backgroundColor) {
+          if (this.ctx.fillStyle !== color) {
+            this.ctx.fillStyle = color;
+          }
+
+          const x = col * this.nodeSize;
+          const y = row * this.nodeSize;
+
+          this.ctx.fillRect(x, y, this.nodeSize, this.nodeSize);
+
+        }
       }
     }
+
+    if (size > 2) {
+      this.drawGridLines(width, height);
+    }
+
+  }
+
+  private drawGridLines(width: number, height: number): void {
+    this.ctx.beginPath();
+    this.ctx.strokeStyle = this.drawNodeBorderColor;
+    this.ctx.lineWidth = 1;
+
+    for (let col = 0; col <= this.gridCols; col++) {
+      const x = col * this.nodeSize;
+      this.ctx.moveTo(x, 0);
+      this.ctx.lineTo(x, height);
+    }
+
+    for (let row = 0; row <= this.gridRows; row++) {
+      const y = row * this.nodeSize;
+      this.ctx.moveTo(0, y);
+      this.ctx.lineTo(width, y);
+    }
+
+    this.ctx.stroke();
   }
 
   drawNode(node: any): void {
     this.ctx.fillStyle = this.getNodeColorFn(node);
     this.ctx.fillRect(node.col * this.nodeSize, node.row * this.nodeSize, this.nodeSize, this.nodeSize);
-    this.ctx.strokeStyle = this.drawNodeBorderColor;
-    this.ctx.strokeRect(node.col * this.nodeSize, node.row * this.nodeSize, this.nodeSize, this.nodeSize);
+
+    if (this.nodeSize > 4) {
+      this.ctx.strokeStyle = this.drawNodeBorderColor;
+      this.ctx.strokeRect(node.col * this.nodeSize, node.row * this.nodeSize, this.nodeSize, this.nodeSize);
+    }
   }
 
   private getContextOrThrow(): CanvasRenderingContext2D {