WIP

src/game/Game.ts

@@ -0,0 +1,80 @@
+import { Chess, ChessInstance, Move } from "chess.js";
+
+class Game {
+  private game: ChessInstance;
+  private replay: ChessInstance;
+  private moves: Move[];
+  private currentPly: number = 0;
+
+  constructor() {
+    this.game = new Chess();
+    this.replay = new Chess();
+    this.moves = [];
+  }
+
+  loadPGN(pgn: string) {
+    this.game.load_pgn(pgn);
+    this.moves = this.game.history({ verbose: true });
+    this.currentPly = 0;
+
+    const fen = this.game.header().FEN;
+
+    if (fen) {
+      this.replay.load(fen);
+    }
+
+    return this;
+  }
+
+  loadFEN(fen: string) {
+    this.game.load(fen);
+    return this;
+  }
+
+  next() {
+    const move = this.moves[this.currentPly];
+
+    if (!move) {
+      return null;
+    }
+
+    this.replay.move(move);
+    this.currentPly++;
+    return move;
+  }
+
+  prev() {
+    const move = this.replay.undo();
+
+    if (!move) {
+      return null;
+    }
+
+    this.currentPly--;
+    return move;
+  }
+
+  last() {
+    while (this.next()) {}
+  }
+
+  first() {
+    while (this.prev()) {}
+  }
+
+  goto(ply: number) {
+    if (ply === this.currentPly || ply < 0 || ply > this.moves.length - 1) {
+      return;
+    }
+
+    while (this.currentPly !== ply) {
+      ply > this.currentPly ? this.next() : this.prev();
+    }
+  }
+
+  getBoardData() {
+    return this.replay.board();
+  }
+}
+
+export default Game;