client/src/components/ComputerGame.vue

   1 <template lang="pug">
   2 BaseGame(
   3   :game="game"
   4   :vr="vr"
   5   @newmove="processMove"
   6   @gameover="gameOver"
   7 )
   8 </template>
   9
  10 <script>
  11 import BaseGame from "@/components/BaseGame.vue";
  12 import { store } from "@/store";
  13 import Worker from "worker-loader!@/playCompMove";
  14 export default {
  15   name: "my-computer-game",
  16   components: {
  17     BaseGame
  18   },
  19   // gameInfo: fen + mode + vname
  20   // mode: "auto" (game comp vs comp) or "versus" (normal)
  21   props: ["gameInfo"],
  22   data: function() {
  23     return {
  24       st: store.state,
  25       game: {},
  26       vr: null,
  27       // Web worker to play computer moves without freezing interface:
  28       timeStart: undefined, //time when computer starts thinking
  29       compThink: false, //avoid asking a new move while one is being searched
  30       compWorker: null
  31     };
  32   },
  33   watch: {
  34     "gameInfo.fen": function() {
  35       this.launchGame();
  36     },
  37     "gameInfo.score": function(newScore) {
  38       if (newScore != "*") {
  39         this.game.score = newScore; //user action
  40         if (!this.compThink) this.$emit("game-stopped"); //otherwise wait for comp
  41       }
  42     }
  43   },
  44   // Modal end of game, and then sub-components
  45   created: function() {
  46     // Computer moves web worker logic:
  47     this.compWorker = new Worker();
  48     this.compWorker.onmessage = e => {
  49       let compMove = e.data;
  50       if (!compMove) {
  51         this.compThink = false;
  52         this.$emit("game-stopped"); //no more moves: mate or stalemate
  53         return; //after game ends, no more moves, nothing to do
  54       }
  55       if (!Array.isArray(compMove)) compMove = [compMove]; //potential multi-move
  56       // Small delay for the bot to appear "more human"
  57       const delay = Math.max(500 - (Date.now() - this.timeStart), 0);
  58       setTimeout(() => {
  59         if (this.currentUrl != document.location.href) return; //page change
  60         // NOTE: Dark and 2-moves are incompatible
  61         const animate = this.gameInfo.vname != "Dark";
  62         const animDelay = animate ? 250 : 0;
  63         let moveIdx = 0;
  64         let self = this;
  65         (function executeMove() {
  66           self.$set(self.game, "moveToPlay", compMove[moveIdx++]);
  67           if (moveIdx >= compMove.length) {
  68             self.compThink = false;
  69             if (self.game.score != "*")
  70               //user action
  71               self.$emit("game-stopped");
  72           } else setTimeout(executeMove, 500 + animDelay);
  73         })();
  74       }, delay);
  75     };
  76     if (this.gameInfo.fen) this.launchGame();
  77   },
  78   methods: {
  79     launchGame: function() {
  80       this.compWorker.postMessage(["scripts", this.gameInfo.vname]);
  81       this.compWorker.postMessage(["init", this.gameInfo.fen]);
  82       this.vr = new V(this.gameInfo.fen);
  83       const mycolor = Math.random() < 0.5 ? "w" : "b";
  84       let players = [{ name: "Myself" }, { name: "Computer" }];
  85       if (mycolor == "b") players = players.reverse();
  86       this.currentUrl = document.location.href; //to avoid playing outside page
  87       // NOTE: fen and fenStart are redundant in game object
  88       this.game = Object.assign({}, this.gameInfo, {
  89         fenStart: this.gameInfo.fen,
  90         players: players,
  91         mycolor: mycolor,
  92         score: "*"
  93       });
  94       this.compWorker.postMessage(["init", this.gameInfo.fen]);
  95       if (mycolor != "w" || this.gameInfo.mode == "auto")
  96         this.playComputerMove();
  97     },
  98     playComputerMove: function() {
  99       this.timeStart = Date.now();
 100       this.compThink = true;
 101       this.compWorker.postMessage(["askmove"]);
 102     },
 103     processMove: function(move) {
 104       if (this.game.score != "*") return;
 105       // Send the move to web worker (including his own moves)
 106       this.compWorker.postMessage(["newmove", move]);
 107       // subTurn condition for Marseille (and Avalanche) rules
 108       if (
 109         (!this.vr.subTurn || this.vr.subTurn <= 1) &&
 110         (this.gameInfo.mode == "auto" || this.vr.turn != this.game.mycolor)
 111       ) {
 112         this.playComputerMove();
 113       }
 114     },
 115     gameOver: function(score, scoreMsg) {
 116       this.game.score = score;
 117       this.game.scoreMsg = scoreMsg;
 118       this.$emit("game-over", score); //bubble up to Rules.vue
 119     }
 120   }
 121 };
 122 </script>