client/src/components/ComputerGame.vue

   1 <template lang="pug">
   2 BaseGame(:game="game" :vr="vr" ref="basegame"
   3   @newmove="processMove" @gameover="gameOver")
   4 </template>
   5
   6 <script>
   7 import BaseGame from "@/components/BaseGame.vue";
   8 import { store } from "@/store";
   9 import Worker from "worker-loader!@/playCompMove";
  10 export default {
  11   name: "my-computer-game",
  12   components: {
  13     BaseGame,
  14   },
  15   // gameInfo: fen + mode + vname
  16   // mode: "auto" (game comp vs comp) or "versus" (normal)
  17   props: ["gameInfo"],
  18   data: function() {
  19     return {
  20       st: store.state,
  21       game: {},
  22       vr: null,
  23       // Web worker to play computer moves without freezing interface:
  24       timeStart: undefined, //time when computer starts thinking
  25       compThink: false, //avoid asking a new move while one is being searched
  26       compWorker: null,
  27     };
  28   },
  29   watch: {
  30     "gameInfo.fen": function() {
  31       this.launchGame();
  32     },
  33     "gameInfo.score": function(newScore) {
  34       if (newScore != "*")
  35       {
  36         this.game.score = newScore; //user action
  37         if (!this.compThink)
  38           this.$emit("game-stopped"); //otherwise wait for comp
  39       }
  40     },
  41   },
  42   // Modal end of game, and then sub-components
  43   created: function() {
  44     // Computer moves web worker logic:
  45     this.compWorker = new Worker();
  46     this.compWorker.onmessage = e => {
  47       let compMove = e.data;
  48       if (!compMove)
  49       {
  50         this.compThink = false;
  51         this.$emit("game-stopped"); //no more moves: mate or stalemate
  52         return; //after game ends, no more moves, nothing to do
  53       }
  54       if (!Array.isArray(compMove))
  55         compMove = [compMove]; //to deal with MarseilleRules
  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)
  60           return; //page change
  61         // NOTE: Dark and 2-moves are incompatible
  62         const animate = (this.gameInfo.vname != "Dark");
  63         const animDelay = (animate ? 250 : 0);
  64         let moveIdx = 0;
  65         let self = this;
  66         (function executeMove() {
  67           self.$set(self.game, "moveToPlay", compMove[moveIdx++]);
  68           if (moveIdx >= compMove.length)
  69           {
  70             self.compThink = false;
  71             if (self.game.score != "*") //user action
  72               self.$emit("game-stopped");
  73           }
  74           else
  75             setTimeout(executeMove, 500 + animDelay);
  76         })();
  77       }, delay);
  78     }
  79     if (!!this.gameInfo.fen)
  80       this.launchGame();
  81   },
  82   methods: {
  83     launchGame: function() {
  84       this.compWorker.postMessage(["scripts",this.gameInfo.vname]);
  85       this.compWorker.postMessage(["init",this.gameInfo.fen]);
  86       this.vr = new V(this.gameInfo.fen);
  87       const mycolor = (Math.random() < 0.5 ? "w" : "b");
  88       let players = [{name:"Myself"},{name:"Computer"}];
  89       if (mycolor == "b")
  90         players = players.reverse();
  91       this.currentUrl = document.location.href; //to avoid playing outside page
  92       // NOTE: fen and fenStart are redundant in game object
  93       this.game = Object.assign({},
  94         this.gameInfo,
  95         {
  96           fenStart: this.gameInfo.fen,
  97           players: players,
  98           mycolor: mycolor,
  99           score: "*",
 100         });
 101       this.compWorker.postMessage(["init",this.gameInfo.fen]);
 102       if (mycolor != "w" || this.gameInfo.mode == "auto")
 103         this.playComputerMove();
 104     },
 105     playComputerMove: function() {
 106       this.timeStart = Date.now();
 107       this.compThink = true;
 108       this.compWorker.postMessage(["askmove"]);
 109     },
 110     processMove: function(move) {
 111       if (this.game.score != "*")
 112         return;
 113       // Send the move to web worker (including his own moves)
 114       this.compWorker.postMessage(["newmove",move]);
 115       // subTurn condition for Marseille (and Avalanche) rules
 116       if ((!this.vr.subTurn || this.vr.subTurn <= 1)
 117         && (this.gameInfo.mode == "auto" || this.vr.turn != this.game.mycolor))
 118       {
 119         this.playComputerMove();
 120       }
 121     },
 122     gameOver: function(score, scoreMsg) {
 123       this.game.score = score;
 124       this.game.scoreMsg = scoreMsg;
 125       this.$emit("game-over", score); //bubble up to Rules.vue
 126     },
 127   },
 128 };
 129 </script>