Fixes

[vchess.git] / client / src / components / ComputerGame.vue

<template lang="pug">
BaseGame(
  ref="basegame"
  :game="game"
  :vr="vr"
  @newmove="processMove"
  @gameover="gameOver"
)
</template>

<script>
import BaseGame from "@/components/BaseGame.vue";
import { store } from "@/store";
import Worker from "worker-loader!@/playCompMove";
export default {
  name: "my-computer-game",
  components: {
    BaseGame
  },
  // gameInfo: fen + mode + vname
  // mode: "auto" (game comp vs comp) or "versus" (normal)
  props: ["gameInfo"],
  data: function() {
    return {
      st: store.state,
      game: {},
      vr: null,
      // Web worker to play computer moves without freezing interface:
      timeStart: undefined, //time when computer starts thinking
      compThink: false, //avoid asking a new move while one is being searched
      compWorker: null
    };
  },
  watch: {
    "gameInfo.fen": function() {
      this.launchGame();
    },
    "gameInfo.score": function(newScore) {
      if (newScore != "*") {
        this.game.score = newScore; //user action
        if (!this.compThink) this.$emit("game-stopped"); //otherwise wait for comp
      }
    }
  },
  created: function() {
    // Computer moves web worker logic:
    this.compWorker = new Worker();
    this.compWorker.onmessage = e => {
      let compMove = e.data;
      if (!compMove) {
        this.compThink = false;
        this.$emit("game-stopped"); //no more moves: mate or stalemate
        return; //after game ends, no more moves, nothing to do
      }
      if (!Array.isArray(compMove)) compMove = [compMove]; //potential multi-move
      // Small delay for the bot to appear "more human"
      const delay = Math.max(500 - (Date.now() - this.timeStart), 0);
      setTimeout(() => {
        if (this.currentUrl != document.location.href) return; //page change
        // NOTE: do not animate move if special display (ShowMoves != "all")
        const animate = V.ShowMoves == "all";
        const animDelay = animate ? 250 : 0;
        let moveIdx = 0;
        let self = this;
        (function executeMove() {
          self.$refs["basegame"].play(compMove[moveIdx++]);
          if (moveIdx >= compMove.length) {
            self.compThink = false;
            if (self.game.score != "*")
              //user action
              self.$emit("game-stopped");
          } else setTimeout(executeMove, 500 + animDelay);
        })();
      }, delay);
    };
    if (this.gameInfo.fen) this.launchGame();
  },
  methods: {
    launchGame: function() {
      this.compWorker.postMessage(["scripts", this.gameInfo.vname]);
      this.compWorker.postMessage(["init", this.gameInfo.fen]);
      this.vr = new V(this.gameInfo.fen);
      const mycolor = Math.random() < 0.5 ? "w" : "b";
      let players = [{ name: "Myself" }, { name: "Computer" }];
      if (mycolor == "b") players = players.reverse();
      this.currentUrl = document.location.href; //to avoid playing outside page
      // NOTE: fen and fenStart are redundant in game object
      this.game = Object.assign({}, this.gameInfo, {
        fenStart: this.gameInfo.fen,
        players: players,
        mycolor: mycolor,
        score: "*"
      });
      this.compWorker.postMessage(["init", this.gameInfo.fen]);
      if (mycolor != "w" || this.gameInfo.mode == "auto")
        this.playComputerMove();
    },
    // NOTE: a "goto" action could lead to an error when comp is thinking,
    // but it's OK because from the user viewpoint the game just stops.
    playComputerMove: function() {
      this.timeStart = Date.now();
      this.compThink = true;
      this.compWorker.postMessage(["askmove"]);
    },
    processMove: function(move) {
      if (this.game.score != "*") return;
      // Send the move to web worker (including his own moves)
      this.compWorker.postMessage(["newmove", move]);
      // subTurn condition for Marseille (and Avalanche) rules
      if (
        (!this.vr.subTurn || this.vr.subTurn <= 1) &&
        (this.gameInfo.mode == "auto" || this.vr.turn != this.game.mycolor)
      ) {
        this.playComputerMove();
      }
    },
    gameOver: function(score, scoreMsg) {
      this.game.score = score;
      this.game.scoreMsg = scoreMsg;
      this.$emit("game-over", score); //bubble up to Rules.vue
    }
  }
};
</script>