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         self.$refs["basegame"].play(compMove, "received");
  47         const animationLength =
  48           // 250 = length of animation, 500 = delay between sub-moves
  49           // TODO: a callback would be cleaner.
  50           250 + (Array.isArray(compMove) ? (compMove.length - 1) * 750 : 0);
  51         setTimeout(() => self.processMove(compMove), animationLength);
  52         self.compThink = false;
  53         if (self.game.score != "*")
  54           // User action
  55           self.$emit("game-stopped");
  56       }, delay);
  57     };
  58   },
  59   methods: {
  60     launchGame: function(game) {
  61       this.compWorker.postMessage(["scripts", this.gameInfo.vname]);
  62       if (!game) {
  63         game = {
  64           vname: this.gameInfo.vname,
  65           fenStart: V.GenRandInitFen(this.st.settings.randomness),
  66           moves: []
  67         };
  68         game.fen = game.fenStart;
  69         if (this.gameInfo.mode == "versus")
  70           CompgameStorage.add(game);
  71       }
  72       if (!game.mycolor) game.mycolor = (Math.random() < 0.5 ? "w" : "b");
  73       this.compWorker.postMessage(["init", game.fen]);
  74       this.vr = new V(game.fen);
  75       game.players = [{ name: "Myself" }, { name: "Computer" }];
  76       if (game.mycolor == "b") game.players = game.players.reverse();
  77       game.score = "*"; //finished games are removed
  78       game.mode = this.gameInfo.mode;
  79       this.currentUrl = document.location.href; //to avoid playing outside page
  80       this.game = game;
  81       this.$refs["basegame"].re_setVariables(game);
  82       this.compWorker.postMessage(["init", game.fen]);
  83       if (this.gameInfo.mode == "auto" || game.mycolor != this.vr.turn)
  84         this.playComputerMove();
  85     },
  86     // NOTE: a "goto" action could lead to an error when comp is thinking,
  87     // but it's OK because from the user viewpoint the game just stops.
  88     playComputerMove: function() {
  89       this.timeStart = Date.now();
  90       this.compThink = true;
  91       this.compWorker.postMessage(["askmove"]);
  92     },
  93     processMove: function(move, scoreObj) {
  94       playMove(move, this.vr);
  95       // This move could have ended the game:
  96       if (!scoreObj) scoreObj = { score: this.vr.getCurrentScore() };
  97       if (scoreObj.score != "*") {
  98         this.gameOver(scoreObj.score);
  99         return;
 100       }
 101       if (this.game.score != "*")
 102         // The game already ended, probably because of a user action
 103         return;
 104       // Send the move to web worker (including his own moves)
 105       this.compWorker.postMessage(["newmove", move]);
 106       if (this.gameInfo.mode == "auto" || this.vr.turn != this.game.mycolor)
 107         this.playComputerMove();
 108       // Finally, update storage:
 109       if (this.gameInfo.mode == "versus") {
 110         CompgameStorage.update(this.gameInfo.vname, {
 111           move: getFilteredMove(move),
 112           fen: this.vr.getFen()
 113         });
 114       }
 115     },
 116     gameOver: function(score) {
 117       this.game.score = score;
 118       this.game.scoreMsg = getScoreMessage(score);
 119       // If comp is thinking, let him finish:
 120       if (!this.compThink) this.$emit("game-stopped");
 121     }
 122   }
 123 };
 124 </script>