add PitAnimator

src/animation/PitAnimator.ts

@@ -0,0 +1,194 @@
+import {
+  MancalaGame,
+  GameStep,
+  HistoryItem,
+  GAME_STEP_GAME_MOVE,
+  GAME_STEP_LAST_STONE_IN_EMPTY_PIT,
+  GAME_STEP_BOARD_CLEARED,
+  GAME_STEP_LAST_STONE_IN_BANK,
+} from "mancala.js";
+import { v4 } from "uuid";
+import { Context } from "../context";
+import BoardViewModelFactory from "../factory/BoardViewModelFactory";
+import { PitViewModelFactory } from "../factory/PitViewModelFactory";
+import BoardViewModel from "../viewmodel/BoardViewModel";
+
+const animationUpdateInterval = 300;
+
+export default class PitAnimator {
+  context: Context;
+  game: MancalaGame;
+  oldGame: MancalaGame;
+  currentIntervalID: number;
+  onBoardViewModelUpdate: (boardViewModel: BoardViewModel) => void;
+  boardViewModel: BoardViewModel;
+  oldBoardViewModel: BoardViewModel;
+  animationIndex: number = 0;
+  currentHistoryItem: HistoryItem;
+
+  constructor(
+    context: Context,
+    onBoardViewModelUpdate: (boardViewModel: BoardViewModel) => void
+  ) {
+    this.context = context;
+    this.onBoardViewModelUpdate = onBoardViewModelUpdate;
+  }
+
+  public setNewGame(game: MancalaGame) {
+    this.reset();
+    this.game = game;
+    this.updateBoardViewModel(this.getBoardViewModelFromGame(this.game));
+  }
+
+  public setUpdatedGame(game: MancalaGame, forceClear = false) {
+    this.resetAnimationState();
+    if (!this.game) {
+      this.setNewGame(game);
+    } else {
+      this.oldGame = this.game;
+      this.game = game;
+      this.onGameMoveAnimationStart();
+    }
+  }
+
+  onGameMoveAnimationStart() {
+    this.stopCurrentAnimation();
+    if (this.game.history.length > 0) {
+      const lastHistoryItem = this.game.history[this.game.history.length - 1];
+      if (lastHistoryItem.gameSteps.length > 0) {
+        this.animationIndex = 0;
+        this.currentHistoryItem = lastHistoryItem;
+        this.boardViewModel = this.getBoardViewModelFromGame(this.game);
+        this.oldBoardViewModel = this.getBoardViewModelFromGame(this.oldGame);
+        this.startAnimationUpdateCyle();
+      }
+    }
+  }
+
+  onAnimate() {
+    if (this.animationIndex === this.currentHistoryItem.gameSteps.length) {
+      this.clearCurrentInterval();
+      this.updateBoardViewModel(this.getBoardViewModelFromGame(this.game));
+    } else {
+      const gameStep = this.currentHistoryItem.gameSteps[this.animationIndex];
+      const index = this.game.board.getPitIndexCircularly(gameStep.index);
+      this.animatePit(index, this.oldBoardViewModel, gameStep);
+      this.updateBoardViewModel(this.oldBoardViewModel);
+    }
+    this.animationIndex++;
+  }
+
+  getGameMoveStepCount(historyItem: HistoryItem) {
+    return historyItem.gameSteps.filter(
+      (gameStep) => gameStep.type === GAME_STEP_GAME_MOVE
+    ).length;
+  }
+
+  animatePit(
+    index: number,
+    boardViewModel: BoardViewModel,
+    gameStep: GameStep
+  ) {
+    const pitViewModel = boardViewModel.pits[index];
+    if (this.animationIndex === 0) {
+      //This one stone move case, TODO : beautify it later
+      if (this.getGameMoveStepCount(this.currentHistoryItem) === 1) {
+        const previousPitIndex = gameStep.index - 1;
+        if (previousPitIndex > 0) {
+          boardViewModel.pits[previousPitIndex].stoneCount = 0;
+        }
+      } else {
+        pitViewModel.stoneCount = 0;
+      }
+    }
+    const theme = this.context.themeManager.theme;
+    if (gameStep.type === GAME_STEP_GAME_MOVE) {
+      pitViewModel.stoneCount += 1;
+      pitViewModel.pitColor = theme.pitGameMoveAnimateColor;
+    } else if (gameStep.type === GAME_STEP_LAST_STONE_IN_EMPTY_PIT) {
+      pitViewModel.pitColor = theme.pitGetRivalStonePitAnimateColor;
+      pitViewModel.stoneCount = 0;
+      const oppositeIndex = this.game.board.getPitIndexCircularly(
+        gameStep.data.oppositeIndex
+      );
+      const oppositePitViewModel = boardViewModel.pits[oppositeIndex];
+      oppositePitViewModel.pitColor = theme.pitGetRivalStonePitAnimateColor;
+      oppositePitViewModel.stoneCount = 0;
+    } else if (gameStep.type === GAME_STEP_LAST_STONE_IN_BANK) {
+      pitViewModel.pitColor = theme.pitLastStoneInBankPitAnimateColor;
+    } else if (gameStep.type === GAME_STEP_BOARD_CLEARED) {
+      for (const index of gameStep.data.pitIndexesThatHasStone) {
+        const oppositeIndex = this.game.board.getPitIndexCircularly(index);
+        const oppositePitViewModel = boardViewModel.pits[oppositeIndex];
+        oppositePitViewModel.pitColor = theme.pitGetRivalStonePitAnimateColor;
+        oppositePitViewModel.stoneCount = 0;
+      }
+    }
+  }
+
+  startAnimationUpdateCyle() {
+    this.clearCurrentInterval();
+    this.currentIntervalID = setInterval(
+      () => this.onAnimate(),
+      animationUpdateInterval
+    );
+  }
+
+  stopCurrentAnimation() {
+    this.clearCurrentInterval();
+    if (this.oldGame) {
+      this.updateBoardViewModel(this.getBoardViewModelFromGame(this.oldGame));
+    }
+    this.resetAnimationState();
+  }
+
+  clearCurrentInterval() {
+    if (this.currentIntervalID) {
+      clearInterval(this.currentIntervalID);
+    }
+  }
+
+  updateBoardViewModel(boardViewModel: BoardViewModel) {
+    boardViewModel.id = v4();
+    this.onBoardViewModelUpdate?.(boardViewModel);
+  }
+
+  private getBoardViewModelFromGame(game: MancalaGame): BoardViewModel {
+    const pitViewModels = this.createPitViewModelsFromGame(game);
+    return BoardViewModelFactory.create(v4(), pitViewModels);
+  }
+
+  private createPitViewModelsFromGame(game: MancalaGame) {
+    return game.board.pits.map((pit) => {
+      const theme = this.context.themeManager.theme;
+      const stoneCount = pit.stoneCount;
+      const stoneColor = theme.ballColor;
+      const pitColor = theme.holeColor;
+      const id = pit.index.toString();
+      return PitViewModelFactory.create({
+        id,
+        stoneCount,
+        stoneColor,
+        pitColor,
+      });
+    });
+  }
+
+  public resetAnimationState() {
+    this.animationIndex = -1;
+    this.currentHistoryItem = null;
+    this.boardViewModel = null;
+    this.oldBoardViewModel = null;
+  }
+
+  public reset() {
+    this.resetAnimationState();
+    this.game = null;
+    this.oldGame = null;
+  }
+
+  public dispose() {
+    this.resetAnimationState();
+    this.clearCurrentInterval();
+  }
+}