IPVGO: Remove current game history from savefile, re-implement superko (#1175)

src/Go/SaveLoad.ts

@@ -12,7 +12,6 @@ import { isInteger, isNumber } from "../types";
 
 type PreviousGameSaveData = { ai: GoOpponent; board: SimpleBoard; previousPlayer: GoColor | null } | null;
 type CurrentGameSaveData = PreviousGameSaveData & {
-  previousBoard: SimpleBoard | null;
   cheatCount: number;
   passCount: number;
 };
@@ -35,7 +34,6 @@ export function getGoSave(): SaveFormat {
     currentGame: {
       ai: Go.currentGame.ai,
       board: simpleBoardFromBoard(Go.currentGame.board),
-      previousBoard: Go.currentGame.previousBoard,
       previousPlayer: Go.currentGame.previousPlayer,
       cheatCount: Go.currentGame.cheatCount,
       passCount: Go.currentGame.passCount,
@@ -94,8 +92,6 @@ function loadCurrentGame(currentGame: unknown): BoardState | string {
   const requiredSize = currentGame.board.length;
   const board = loadSimpleBoard(currentGame.board, requiredSize);
   if (typeof board === "string") return board;
-  const previousBoard = currentGame.previousBoard ? loadSimpleBoard(currentGame.previousBoard, requiredSize) : null;
-  if (typeof previousBoard === "string") return previousBoard;
   const previousPlayer = getEnumHelper("GoColor").getMember(currentGame.previousPlayer) ?? null;
   if (!isInteger(currentGame.cheatCount) || currentGame.cheatCount < 0)
     return "invalid number for currentGame.cheatCount";
@@ -105,7 +101,7 @@ function loadCurrentGame(currentGame: unknown): BoardState | string {
   boardState.previousPlayer = previousPlayer;
   boardState.cheatCount = currentGame.cheatCount;
   boardState.passCount = currentGame.passCount;
-  boardState.previousBoard = previousBoard;
+  boardState.previousBoards = [];
   return boardState;
 }
 

src/Go/Types.ts

@@ -36,8 +36,8 @@ export type EyeMove = {
 export type BoardState = {
   board: Board;
   previousPlayer: GoColor | null;
-  /** The previous board position as a SimpleBoard */
-  previousBoard: SimpleBoard | null;
+  /** The previous board positions as a SimpleBoard */
+  previousBoards: SimpleBoard[];
   ai: GoOpponent;
   passCount: number;
   cheatCount: number;

src/Go/boardAnalysis/boardAnalysis.ts

@@ -44,7 +44,7 @@ export function evaluateIfMoveIsValid(boardState: BoardState, x: number, y: numb
   }
 
   // Detect if the move might be an immediate repeat (only one board of history is saved to check)
-  const possibleRepeat = boardState.previousBoard && getColorOnSimpleBoard(boardState.previousBoard, x, y) === player;
+  const possibleRepeat = boardState.previousBoards.find((board) => getColorOnSimpleBoard(board, x, y) === player);
 
   if (shortcut) {
     // If the current point has some adjacent open spaces, it is not suicide. If the move is not repeated, it is legal
@@ -85,9 +85,11 @@ export function evaluateIfMoveIsValid(boardState: BoardState, x: number, y: numb
   if (evaluationBoard[x]?.[y]?.color !== player) {
     return GoValidity.noSuicide;
   }
-  if (possibleRepeat && boardState.previousBoard) {
+  if (possibleRepeat && boardState.previousBoards.length) {
     const simpleEvalBoard = simpleBoardFromBoard(evaluationBoard);
-    if (areSimpleBoardsIdentical(simpleEvalBoard, boardState.previousBoard)) return GoValidity.boardRepeated;
+    if (boardState.previousBoards.find((board) => areSimpleBoardsIdentical(simpleEvalBoard, board))) {
+      return GoValidity.boardRepeated;
+    }
   }
 
   return GoValidity.valid;

src/Go/boardState/boardState.ts

@@ -27,7 +27,7 @@ export function getNewBoardState(
   }
 
   const newBoardState: BoardState = {
-    previousBoard: null,
+    previousBoards: [],
     previousPlayer: GoColor.white,
     ai: ai,
     passCount: 0,
@@ -82,7 +82,12 @@ export function makeMove(boardState: BoardState, x: number, y: number, player: G
     return false;
   }
 
-  boardState.previousBoard = simpleBoardFromBoard(boardState.board);
+  // Only maintain last 7 moves
+  boardState.previousBoards.unshift(simpleBoardFromBoard(boardState.board));
+  if (boardState.previousBoards.length > 7) {
+    boardState.previousBoards.pop();
+  }
+
   const point = boardState.board[x][y];
   if (!point) return false;
 
@@ -266,7 +271,7 @@ export function getEmptySpaces(board: Board): PointState[] {
 export function getStateCopy(initialState: BoardState) {
   const boardState = structuredClone(initialState);
 
-  boardState.previousBoard = initialState.previousBoard ? [...initialState.previousBoard] : null;
+  boardState.previousBoards = initialState.previousBoards ?? [];
   boardState.previousPlayer = initialState.previousPlayer;
   boardState.ai = initialState.ai;
   boardState.passCount = initialState.passCount;

src/Go/effects/effect.ts

@@ -98,7 +98,7 @@ function calculateMults(): Multipliers {
 }
 
 export function playerHasDiscoveredGo() {
-  const playedGame = Go.currentGame.previousBoard;
+  const playedGame = Go.currentGame.previousBoards.length;
   const hasRecords = getRecordValues(Go.stats).some((stats) => stats.wins + stats.losses);
   const isInBn14 = Player.bitNodeN === 14;
 

src/Go/effects/netscriptGoImplementation.ts

@@ -300,11 +300,11 @@ export function getCurrentPlayer(): "None" | "White" | "Black" {
  * Find a move made by the previous player, if present.
  */
 export function getPreviousMove(): [number, number] | null {
-  if (Go.currentGame.passCount) {
+  const priorBoard = Go.currentGame?.previousBoards[0];
+  if (Go.currentGame.passCount || !priorBoard) {
     return null;
   }
 
-  const priorBoard = Go.currentGame?.previousBoard;
   for (const rowIndexString in Go.currentGame.board) {
     const row = Go.currentGame.board[+rowIndexString] ?? [];
     for (const pointIndexString in row) {
@@ -348,7 +348,7 @@ export function resetBoardState(error: (s: string) => void, opponent: GoOpponent
   }
 
   const oldBoardState = Go.currentGame;
-  if (oldBoardState.previousPlayer !== null && oldBoardState.previousBoard) {
+  if (oldBoardState.previousPlayer !== null && oldBoardState.previousBoards.length) {
     resetWinstreak(oldBoardState.ai, false);
   }
 

src/Go/ui/GoGameboardWrapper.tsx

@@ -143,7 +143,7 @@ export function GoGameboardWrapper({ showInstructions }: GoGameboardWrapperProps
     setScoreOpen(false);
     setSearchOpen(false);
     setOpponent(newOpponent);
-    if (boardState.previousPlayer !== null && boardState.previousBoard) {
+    if (boardState.previousPlayer !== null && boardState.previousBoards.length) {
       resetWinstreak(boardState.ai, false);
     }
 
@@ -152,16 +152,16 @@ export function GoGameboardWrapper({ showInstructions }: GoGameboardWrapperProps
   }
 
   function getPriorMove() {
-    if (!boardState.previousBoard) return boardState;
+    if (!boardState.previousBoards.length) return boardState;
     const priorState = getStateCopy(boardState);
     priorState.previousPlayer = boardState.previousPlayer === GoColor.black ? GoColor.white : GoColor.black;
-    priorState.board = boardFromSimpleBoard(boardState.previousBoard);
+    priorState.board = boardFromSimpleBoard(boardState.previousBoards[0]);
     updateCaptures(priorState.board, priorState.previousPlayer);
     return priorState;
   }
 
   function showPreviousMove(newValue: boolean) {
-    if (boardState.previousBoard) {
+    if (boardState.previousBoards.length) {
       setShowPriorMove(newValue);
     }
   }
@@ -175,7 +175,7 @@ export function GoGameboardWrapper({ showInstructions }: GoGameboardWrapperProps
     boardState.previousPlayer === GoColor.white && !getAllValidMoves(boardState, GoColor.black).length;
   const disablePassButton = opponent !== GoOpponent.none && boardState.previousPlayer === GoColor.black && waitingOnAI;
 
-  const scoreBoxText = boardState.previousBoard
+  const scoreBoxText = boardState.previousBoards.length
     ? `Score: Black: ${score[GoColor.black].sum} White: ${score[GoColor.white].sum}`
     : "Place a router to begin!";
 
@@ -256,7 +256,7 @@ export function GoGameboardWrapper({ showInstructions }: GoGameboardWrapperProps
             />
             <OptionSwitch
               checked={showPriorMove}
-              disabled={!boardState.previousBoard}
+              disabled={!boardState.previousBoards.length}
               onChange={(newValue) => showPreviousMove(newValue)}
               text="Show previous move"
               tooltip={<>Show the board as it was before the last move</>}

src/Go/ui/GoPoint.tsx

@@ -41,7 +41,8 @@ export function GoPoint({ state, x, y, traditional, hover, valid, emptyPointOwne
 
   const sizeClass = getSizeClass(state.board[0].length, classes);
 
-  const isNewStone = state.previousBoard && getColorOnSimpleBoard(state.previousBoard, x, y) === GoColor.empty;
+  const isNewStone =
+    state.previousBoards.length && getColorOnSimpleBoard(state.previousBoards[0], x, y) === GoColor.empty;
   const isPriorMove = player === state.previousPlayer && isNewStone;
 
   const emptyPointColorClass =

src/Go/ui/GoTutorialChallenge.tsx

@@ -38,7 +38,7 @@ export function GoTutorialChallenge({
   const [showReset, setShowReset] = useState(false);
 
   const handleClick = (x: number, y: number) => {
-    if (stateRef.current.previousBoard) {
+    if (stateRef.current.previousBoards.length) {
       SnackbarEvents.emit(`Hit 'Reset' to try again`, ToastVariant.WARNING, 2000);
       return;
     }
@@ -67,6 +67,7 @@ export function GoTutorialChallenge({
 
   const reset = () => {
     stateRef.current = getStateCopy(state);
+    stateRef.current.previousBoards = [];
     setDisplayText(description);
     setShowReset(false);
   };

test/jest/Go/NetscriptGo.test.ts

@@ -81,7 +81,7 @@ describe("Netscript Go API unit tests", () => {
     it("should correctly retrieve the current game state", async () => {
       const board = ["OXX..", ".....", ".....", "...XX", "...X."];
       const boardState = boardStateFromSimpleBoard(board, GoOpponent.Daedalus, GoColor.black);
-      boardState.previousBoard = ["OX..", ".....", ".....", "...XX", "...X."];
+      boardState.previousBoards = [["OX..", ".....", ".....", "...XX", "...X."]];
       Go.currentGame = boardState;
 
       const result = getGameState();
@@ -232,7 +232,7 @@ describe("Netscript Go API unit tests", () => {
 
       await cheatPlayTwoMoves(mockLogger, 4, 3, 3, 4, 1, 0);
       expect(mockLogger).toHaveBeenCalledWith("Cheat failed! You have been ejected from the subnet.");
-      expect(Go.currentGame.previousBoard).toEqual(null);
+      expect(Go.currentGame.previousBoards).toEqual([]);
     });
   });
   describe("cheatRemoveRouter() tests", () => {
@@ -270,7 +270,7 @@ describe("Netscript Go API unit tests", () => {
 
       await cheatRemoveRouter(mockLogger, 0, 0, 1, 0);
       expect(mockLogger).toHaveBeenCalledWith("Cheat failed! You have been ejected from the subnet.");
-      expect(Go.currentGame.previousBoard).toEqual(null);
+      expect(Go.currentGame.previousBoards).toEqual([]);
     });
   });
   describe("cheatRepairOfflineNode() tests", () => {

test/jest/Go/boardAnalysis.test.ts

@@ -53,4 +53,16 @@ describe("Go board analysis tests", () => {
 
     expect(validity).toEqual(GoValidity.noSuicide);
   });
+
+  it("identifies invalid moves from repeat", async () => {
+    const board = [".X...", ".....", ".....", ".....", "....."];
+    const boardState = boardStateFromSimpleBoard(board);
+    boardState.previousBoards.push([".X...", ".....", ".....", ".....", "....."]);
+    boardState.previousBoards.push([".X...", ".....", ".....", ".....", "....."]);
+    boardState.previousBoards.push([".X...", ".....", ".....", ".....", "....."]);
+    boardState.previousBoards.push(["OX...", ".....", ".....", ".....", "....."]);
+    const validity = evaluateIfMoveIsValid(boardState, 0, 0, GoColor.white, false);
+
+    expect(validity).toEqual(GoValidity.boardRepeated);
+  });
 });

test/jest/__snapshots__/FullSave.test.ts.snap

@@ -41,7 +41,6 @@ exports[`Check Save File Continuity GoSave continuity 1`] = `
     ],
     "cheatCount": 0,
     "passCount": 0,
-    "previousBoard": null,
     "previousPlayer": "White",
   },
   "previousGame": null,