feat: clean ups and shorter files

src/app/services/board-selection.service.ts

@@ -0,0 +1,64 @@
+import { Injectable, DestroyRef, inject } from '@angular/core';
+import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
+import { GameApiService } from './game-api.service';
+import { getPieceAtSquare, isPieceColor } from '../core/chess/fen.utils';
+import { GameState, LegalMove } from '../models/game.models';
+
+export interface BoardSelection {
+  selectedSquare: string | null;
+  highlightedSquares: string[];
+  selectedSquareMoves: LegalMove[];
+}
+
+@Injectable({ providedIn: 'root' })
+export class BoardSelectionService {
+  private readonly gameApi = inject(GameApiService);
+  private readonly destroyRef = inject(DestroyRef);
+
+  handleSquareSelection(
+    square: string,
+    gameId: string,
+    state: GameState | null,
+    currentSelection: BoardSelection,
+    onMovesLoaded: (moves: LegalMove[]) => void,
+    onError: (error: string) => void
+  ): BoardSelection {
+    if (!state) {
+      return currentSelection;
+    }
+
+    // If clicking on a highlighted square, it's a move
+    if (currentSelection.selectedSquare && currentSelection.highlightedSquares.includes(square)) {
+      const selectedMove = currentSelection.selectedSquareMoves.find((move) => move.to === square);
+      if (selectedMove) {
+        return { selectedSquare: null, highlightedSquares: [], selectedSquareMoves: [] };
+      }
+      return currentSelection;
+    }
+
+    // Check if square has a piece of the correct color
+    const piece = getPieceAtSquare(state.fen, square);
+    if (!piece || !isPieceColor(piece, state.turn)) {
+      return { selectedSquare: null, highlightedSquares: [], selectedSquareMoves: [] };
+    }
+
+    // Load legal moves for this square
+    this.gameApi
+      .getLegalMoves(gameId, square)
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe({
+        next: (response) => {
+          onMovesLoaded(response.moves);
+        },
+        error: () => {
+          onError('Could not load legal moves for selected square.');
+        }
+      });
+
+    return { selectedSquare: square, highlightedSquares: [], selectedSquareMoves: [] };
+  }
+
+  clearSelection(): BoardSelection {
+    return { selectedSquare: null, highlightedSquares: [], selectedSquareMoves: [] };
+  }
+}