client/src/components/ComputerGame.vue

   1 <template lang="pug">
   2 BaseGame(
   3   ref="basegame"
   4   :game="game"
   5   @newmove="processMove"
   6 )
   7 </template>
   8
   9 <script>
  10 import BaseGame from "@/components/BaseGame.vue";
  11 import { store } from "@/store";
  12 import { CompgameStorage } from "@/utils/compgameStorage";
  13 import { getScoreMessage } from "@/utils/scoring";
  14 import { playMove, getFilteredMove } from "@/utils/playUndo";
  15 import Worker from "worker-loader!@/playCompMove";
  16 export default {
  17   name: "my-computer-game",
  18   components: {
  19     BaseGame
  20   },
  21   // gameInfo: fen + mode + vname
  22   // mode: "auto" (game comp vs comp) or "versus" (normal)
  23   props: ["gameInfo"],
  24   data: function() {
  25     return {
  26       st: store.state,
  27       game: {},
  28       vr: null,
  29       // Web worker to play computer moves without freezing interface:
  30       timeStart: undefined, //time when computer starts thinking
  31       compThink: false, //avoid asking a new move while one is being searched
  32       compWorker: null
  33     };
  34   },
  35   created: function() {
  36     // Computer moves web worker logic:
  37     this.compWorker = new Worker();
  38     this.compWorker.onmessage = e => {
  39       let compMove = e.data;
  40       // Small delay for the bot to appear "more human"
  41       const minDelay = this.gameInfo.mode == "versus" ? 500 : 1000;
  42       const delay = Math.max(minDelay - (Date.now() - this.timeStart), 0);
  43       let self = this;
  44       setTimeout(() => {
  45         if (this.currentUrl != document.location.href) return; //page change
  46         // NOTE: BaseGame::play() will trigger processMove() here
  47         self.$refs["basegame"].play(compMove, "received");
  48         self.compThink = false;
  49         if (self.game.score != "*")
  50           // User action
  51           self.$emit("game-stopped");
  52       }, delay);
  53     };
  54   },
  55   methods: {
  56     launchGame: function(game) {
  57       this.compWorker.postMessage(["scripts", this.gameInfo.vname]);
  58       if (!game) {
  59         game = {
  60           vname: this.gameInfo.vname,
  61           fenStart: V.GenRandInitFen(this.st.settings.randomness),
  62           moves: []
  63         };
  64         game.fen = game.fenStart;
  65         if (this.gameInfo.mode == "versus")
  66           CompgameStorage.add(game);
  67       }
  68       if (this.gameInfo.mode == "versus" && !game.mycolor)
  69         game.mycolor = Math.random() < 0.5 ? "w" : "b";
  70       this.compWorker.postMessage(["init", game.fen]);
  71       this.vr = new V(game.fen);
  72       game.players = [{ name: "Myself" }, { name: "Computer" }];
  73       if (game.myColor == "b") game.players = game.players.reverse();
  74       game.score = "*"; //finished games are removed
  75       this.currentUrl = document.location.href; //to avoid playing outside page
  76       this.game = game;
  77       this.compWorker.postMessage(["init", game.fen]);
  78       if (this.gameInfo.mode == "auto" || game.mycolor != this.vr.turn)
  79         this.playComputerMove();
  80     },
  81     // NOTE: a "goto" action could lead to an error when comp is thinking,
  82     // but it's OK because from the user viewpoint the game just stops.
  83     playComputerMove: function() {
  84       this.timeStart = Date.now();
  85       this.compThink = true;
  86       this.compWorker.postMessage(["askmove"]);
  87     },
  88     processMove: function(move, scoreObj) {
  89       playMove(move, this.vr);
  90       // This move could have ended the game:
  91       if (scoreObj.score != "*") {
  92         this.gameOver(scoreObj.score);
  93         return;
  94       }
  95       if (this.game.score != "*")
  96         // The game already ended, probably because of a user action
  97         return;
  98       // Send the move to web worker (including his own moves)
  99       this.compWorker.postMessage(["newmove", move]);
 100       if (this.gameInfo.mode == "auto" || this.vr.turn != this.game.mycolor)
 101         this.playComputerMove();
 102       // Finally, update storage:
 103       if (this.gameInfo.mode == "versus") {
 104         CompgameStorage.update(this.gameInfo.vname, {
 105           move: getFilteredMove(move),
 106           fen: this.vr.getFen()
 107         });
 108       }
 109     },
 110     gameOver: function(score) {
 111       this.game.score = score;
 112       this.game.scoreMsg = getScoreMessage(score);
 113       // If comp is thinking, let him finish:
 114       if (!this.compThink) this.$emit("game-stopped");
 115     }
 116   }
 117 };
 118 </script>