feat: piece pormotion

src/app/pages/game/game.component.html

@@ -1,4 +1,10 @@
 <main class="game-shell">
+  <app-promotion-dialog
+    [isOpen]="facade.isPromotionDialogOpen"
+    (promotionSelected)="facade.onPromotionSelected($event)"
+    (closed)="facade.onPromotionClosed()"
+  />
+
   <section class="game-card">
     <header class="mb-3">
       <a routerLink="/" class="back-link">Back</a>

src/app/pages/game/game.component.ts

@@ -4,13 +4,14 @@ import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import { FormsModule } from '@angular/forms';
 import { ActivatedRoute, RouterLink } from '@angular/router';
 import { ChessBoardComponent } from '../../components/chess-board/chess-board.component';
-  import { InputCardComponent } from '../../components/input-card/input-card.component';
+import { InputCardComponent } from '../../components/input-card/input-card.component';
+import { PromotionDialogComponent } from '../../components/promotion-dialog/promotion-dialog.component';
 import { GameFacade } from './game.facade';
 
 @Component({
   selector: 'app-game',
   standalone: true,
-  imports: [CommonModule, FormsModule, RouterLink, ChessBoardComponent, InputCardComponent],
+  imports: [CommonModule, FormsModule, RouterLink, ChessBoardComponent, InputCardComponent, PromotionDialogComponent],
   providers: [GameFacade],
   templateUrl: './game.component.html',
   styleUrl: './game.component.css'

src/app/pages/game/game.facade.ts

@@ -1,7 +1,7 @@
 import { DestroyRef, Injectable, OnDestroy, inject } from '@angular/core';
 import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import { getErrorMessage } from '../../core/http/error-message.util';
-import { GameFull, GameState, GameStreamEvent } from '../../models/game.models';
+import { GameFull, GameState, GameStreamEvent, LegalMove } from '../../models/game.models';
 import { GameApiService } from '../../services/game-api.service';
 import { BotMoveService } from '../../services/bot-move.service';
 import { GameCompletionService } from '../../services/game-completion.service';
@@ -20,12 +20,14 @@ export class GameFacade implements OnDestroy {
   loading = true;
   gameCompletionMessage = '';
   isGameFinished = false;
+  isPromotionDialogOpen = false;
 
   private boardSelection: BoardSelection = {
     selectedSquare: null,
     highlightedSquares: [],
     selectedSquareMoves: []
   };
+  private pendingPromotionMoves: LegalMove[] = [];
 
   private readonly gameApi = inject(GameApiService);
   private readonly destroyRef = inject(DestroyRef);
@@ -66,6 +68,15 @@ export class GameFacade implements OnDestroy {
     if (this.boardSelection.selectedSquare && this.boardSelection.highlightedSquares.includes(square)) {
       const selectedMove = this.boardSelection.selectedSquareMoves.find((move) => move.to === square);
       if (selectedMove) {
+        // If multiple promotion outcomes exist for the target, ask player to choose one.
+        const promotionMoves = this.boardSelection.selectedSquareMoves.filter(
+          (move) => move.to === square && !!move.promotion
+        );
+        if (promotionMoves.length > 0) {
+          this.pendingPromotionMoves = promotionMoves;
+          this.isPromotionDialogOpen = true;
+          return;
+        }
         this.moveInput = selectedMove.uci;
         this.submitMove();
       }
@@ -134,6 +145,28 @@ export class GameFacade implements OnDestroy {
       });
   }
 
+  onPromotionSelected(promotionPiece: 'queen' | 'rook' | 'bishop' | 'knight'): void {
+    const selectedPromotionMove = this.pendingPromotionMoves.find((move) => move.promotion === promotionPiece);
+    if (!selectedPromotionMove) {
+      this.errorMessage = 'Selected promotion move is unavailable.';
+      this.isPromotionDialogOpen = false;
+      this.pendingPromotionMoves = [];
+      return;
+    }
+
+    this.moveInput = selectedPromotionMove.uci;
+    this.isPromotionDialogOpen = false;
+    this.boardSelection = this.boardSelectionService.clearSelection();
+    this.pendingPromotionMoves = [];
+    this.submitMove();
+  }
+
+  onPromotionClosed(): void {
+    this.isPromotionDialogOpen = false;
+    this.boardSelection = this.boardSelectionService.clearSelection();
+    this.pendingPromotionMoves = [];
+  }
+
   importFen(): void {
     this.errorMessage = '';
     this.importService.importFen(