client/src/components/ComputerGame.vue

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