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[vchess.git] / client / src / components / Game.vue

<template lang="pug">
.row
  .col-sm-12.col-md-10.col-md-offset-1.col-lg-8.col-lg-offset-2
    input#modalEog.modal(type="checkbox")
    div(role="dialog" aria-labelledby="eogMessage")
      .card.smallpad.small-modal.text-center
        label.modal-close(for="modalEog")
        h3#eogMessage.section {{ endgameMessage }}
    //Chat(:opponents="opponents" :people="people")
    Board(:vr="vr" :last-move="lastMove" :mode="mode" :user-color="mycolor"
      :orientation="orientation" :vname="variant.name" @play-move="play")
    .button-group
      button(@click="() => play()") Play
      button(@click="() => undo()") Undo
      button(@click="flip") Flip
      button(@click="gotoBegin") GotoBegin
      button(@click="gotoEnd") GotoEnd
    .button-group(v-if="mode=='human'")
      button(@click="offerDraw") Draw
      button(@click="abortGame") Abort
      button(@click="resign") Resign
    div(v-if="mode=='human' && subMode=='corr'")
      textarea(v-show="score=='*' && vr.turn==mycolor" v-model="corrMsg")
      div(v-show="cursor>=0") {{ moves[cursor].message }}
    .section-content(v-if="showFen && !!vr" id="fen-div")
      p#fenString.text-center {{ vr.getFen() }}
    #pgnDiv.section-content
      a#download(href="#")
      .button-group
        button#downloadBtn(@click="download") {{ st.tr["Download PGN"] }}
        button Import game
    //MoveList(v-if="showMoves"
      :moves="moves" :cursor="cursor" @goto-move="gotoMove")
</template>

<script>
// Game logic on a variant page: 3 modes, analyze, computer or human
// TODO: envoyer juste "light move", sans FEN ni notation ...etc
// TODO: if I'm an observer and player(s) disconnect/reconnect, how to find me ?
//      onClick :: ask full game to remote player, and register as an observer in game
//      (use gameId to communicate)
//      on landing on game :: if gameId not found locally, check remotely
//      ==> il manque un param dans game : "remoteId"
// TODO: import store, st
import Board from "@/components/Board.vue";
//import Chat from "@/components/Chat.vue";
//import MoveList from "@/components/MoveList.vue";
import { store } from "@/store";

import { getSquareId } from "@/utils/squareId";

import Worker from 'worker-loader!@/playCompMove';

export default {
  name: 'my-game',
  components: {
    Board,
  },
  // gameId: to find the game in storage (assumption: it exists)
  // fen: to start from a FEN without identifiers (analyze mode)
  // subMode: "auto" (game comp vs comp) or "corr" (correspondance game),
  // or "examine" (after human game: TODO)
  // gameRef in URL hash (listen for changes)
  props: ["gidOrFen","mode","subMode","variant"],
  data: function() {
    return {
      st: store.state,
      // Web worker to play computer moves without freezing interface:
      timeStart: undefined, //time when computer starts thinking
      vr: null, //VariantRules object, describing the game state + rules
      endgameMessage: "",
      orientation: "w",
      lockCompThink: false, //to avoid some ghost moves
      myname: store.state.user.name, //may be anonymous (thus no name)
      opponents: {}, //filled later (potentially 2 or 3 opponents)
      drawOfferSent: false, //did I just ask for draw?
      people: [], //observers
      score: "*", //'*' means 'unfinished'
      // userColor: given by gameId, or fen in problems mode (if no game Id)...
      mycolor: "w",
      fenStart: "",
      moves: [], //all moves played in current game
      cursor: -1, //index of the move just played
      lastMove: null,
      compWorker: null,
    };
  },
  watch: {
    gidOrFen: function() {
      // (Security) No effect if a computer move is in progress:
      if (this.mode == "computer" && this.lockCompThink)
        return this.$emit("computer-think");
      this.launchGame();
    },
  },
  computed: {
    showMoves: function() {
      return true;
      //return window.innerWidth >= 768;
    },
    showFen: function() {
      return this.variant.name != "Dark" || this.score != "*";
    },
  },
  // Modal end of game, and then sub-components
  created: function() {
    if (!!this.gidOrFen)
      this.launchGame();
    // TODO: if I'm one of the players in game, then:
    // Send ping to server (answer pong if opponent[s] is connected)
    if (true && !!this.conn && !!this.gameRef)
    {
      this.conn.onopen = () => {
        this.conn.send(JSON.stringify({
          code:"ping",oppid:this.oppid,gameId:this.gameRef.id}));
      };
    }
    // TODO: also handle "draw accepted" (use opponents array?)
    // --> must give this info also when sending lastState...
    // and, if all players agree then OK draw (end game ...etc)
    const socketMessageListener = msg => {
      const data = JSON.parse(msg.data);
      let L = undefined;
      switch (data.code)
      {
        case "newmove": //..he played!
          this.play(data.move, this.variant.name!="Dark" ? "animate" : null);
          break;
        case "pong": //received if we sent a ping (game still alive on our side)
          if (this.gameRef.id != data.gameId)
            break; //games IDs don't match: definitely over...
          this.oppConnected = true;
          // Send our "last state" informations to opponent(s)
          L = this.vr.moves.length;
          Object.keys(this.opponents).forEach(oid => {
            this.conn.send(JSON.stringify({
              code: "lastate",
              oppid: oid,
              gameId: this.gameRef.id,
              lastMove: (L>0?this.vr.moves[L-1]:undefined),
              movesCount: L,
            }));
          });
          break;
        // TODO: refactor this, because at 3 or 4 players we may have missed 2 or 3 moves (not just one)
        case "lastate": //got opponent infos about last move
          L = this.vr.moves.length;
          if (this.gameRef.id != data.gameId)
            break; //games IDs don't match: nothing we can do...
          // OK, opponent still in game (which might be over)
          if (this.score != "*")
          {
            // We finished the game (any result possible)
            this.conn.send(JSON.stringify({
              code: "lastate",
              oppid: data.oppid,
              gameId: this.gameRef.id,
              score: this.score,
            }));
          }
          else if (!!data.score) //opponent finished the game
            this.endGame(data.score);
          else if (data.movesCount < L)
          {
            // We must tell last move to opponent
            this.conn.send(JSON.stringify({
              code: "lastate",
              oppid: this.opponent.id,
              gameId: this.gameRef.id,
              lastMove: this.vr.moves[L-1],
              movesCount: L,
            }));
          }
          else if (data.movesCount > L) //just got last move from him
            this.play(data.lastMove, "animate");
          break;
        case "resign": //..you won!
          this.endGame(this.mycolor=="w"?"1-0":"0-1");
          break;
        // TODO: also use (dis)connect info to count online players?
        case "gameconnect":
        case "gamedisconnect":
          if (this.mode=="human")
          {
            const online = (data.code == "connect");
            // If this is an opponent ?
            if (!!this.opponents[data.id])
              this.opponents[data.id].online = online;
            else
            {
              // Or an observer ?
              if (!online)
                delete this.people[data.id];
              else
                this.people[data.id] = data.name;
            }
          }
          break;
      }
    };
    const socketCloseListener = () => {
      this.conn.addEventListener('message', socketMessageListener);
      this.conn.addEventListener('close', socketCloseListener);
    };
    if (!!this.conn)
    {
      this.conn.onmessage = socketMessageListener;
      this.conn.onclose = socketCloseListener;
    }
    // Computer moves web worker logic: (TODO: also for observers in HH games ?)
    this.compWorker = new Worker(); //'/javascripts/playCompMove.js'),
    this.compWorker.onmessage = e => {
      this.lockCompThink = true; //to avoid some ghost moves
      let compMove = e.data;
      if (!Array.isArray(compMove))
        compMove = [compMove]; //to deal with MarseilleRules
      // Small delay for the bot to appear "more human"
      const delay = Math.max(500-(Date.now()-this.timeStart), 0);
      setTimeout(() => {
        const animate = this.variant.name != "Dark";
        this.play(compMove[0], animate);
        if (compMove.length == 2)
          setTimeout( () => { this.play(compMove[1], animate); }, 750);
        else //250 == length of animation (TODO: should be a constant somewhere)
          setTimeout( () => this.lockCompThink = false, 250);
      }, delay);
    }
  },
  // dans variant.js (plutôt room.js) conn gère aussi les challenges
  // et les chats dans chat.js. Puis en webRTC, repenser tout ça.
  methods: {
    offerDraw: function() {
      if (!confirm("Offer draw?"))
        return;
      // Stay in "draw offer sent" state until next move is played
      this.drawOfferSent = true;
      if (this.subMode == "corr")
      {
        // TODO: set drawOffer on in game (how ?)
      }
      else //live game
      {
        this.opponents.forEach(o => {
          if (!!o.online)
          {
            try {
              this.conn.send(JSON.stringify({code: "draw", oppid: o.id}));
            } catch (INVALID_STATE_ERR) {
              return;
            }
          }
        });
      }
    },
    // + conn handling: "draw" message ==> agree for draw (if we have "drawOffered" at true)
    receiveDrawOffer: function() {
      //if (...)
      // TODO: ignore if preventDrawOffer is set; otherwise show modal box with option "prevent future offers"
      // if accept: send message "draw"
    },
    abortGame: function() {
      if (!confirm("Abort the game?"))
        return;
      //+ bouton "abort" avec score == "?" + demander confirmation pour toutes ces actions,
      //send message: "gameOver" avec score "?"
    },
    resign: function(e) {
      if (!confirm("Resign the game?"))
        return;
      if (this.mode == "human" && this.oppConnected(this.oppid))
      {
        try {
          this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
        } catch (INVALID_STATE_ERR) {
          return;
        }
      }
      this.endGame(this.mycolor=="w"?"0-1":"1-0");
    },
    launchGame: async function() {
      const vModule = await import("@/variants/" + this.variant.name + ".js");
      window.V = vModule.VariantRules;
      this.compWorker.postMessage(["scripts",this.variant.name]);
      if (this.gidOrFen.indexOf('/') >= 0)
        this.newGameFromFen(this.gidOrFen);
      else
        this.loadGame(this.gidOrFen);
    },
    newGameFromFen: function(fen) {
      this.vr = new V(fen);
      this.moves = [];
      this.cursor = -1;
      this.fenStart = fen;
      this.score = "*";
      if (this.mode == "analyze")
      {
        this.mycolor = V.ParseFen(fen).turn;
        this.orientation = this.mycolor;
      }
      else if (this.mode == "computer") //only other alternative (HH with gameId)
      {
        this.mycolor = (Math.random() < 0.5 ? "w" : "b");
        this.orientation = this.mycolor;
        this.compWorker.postMessage(["init",fen]);
        if (this.mycolor != "w" || this.subMode == "auto")
          this.playComputerMove();
      }
    },
    loadGame: function(gid) {
      // TODO: ask game to remote peer if this.remoteId is set
      // (or just if game not found locally)
      // NOTE: if it's a corr game, ask it from server
      const game = getGameFromStorage(gid); //, this.gameRef.uid); //uid may be blank
      this.opponent.id = game.oppid; //opponent ID in case of running HH game
      this.opponent.name = game.oppname; //maye be blank (if anonymous)
      this.score = game.score;
      this.mycolor = game.mycolor;
      this.fenStart = game.fenStart;
      this.moves = game.moves;
      this.cursor = game.moves.length-1;
      this.lastMove = (game.moves.length > 0 ? game.moves[this.cursor] : null);
    },
    setEndgameMessage: function(score) {
      let eogMessage = "Undefined";
      switch (score)
      {
        case "1-0":
          eogMessage = translations["White win"];
          break;
        case "0-1":
          eogMessage = translations["Black win"];
          break;
        case "1/2":
          eogMessage = translations["Draw"];
          break;
        case "?":
          eogMessage = "Unfinished";
          break;
      }
      this.endgameMessage = eogMessage;
    },
    download: function() {
      const content = this.getPgn();
      // Prepare and trigger download link
      let downloadAnchor = document.getElementById("download");
      downloadAnchor.setAttribute("download", "game.pgn");
      downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
      downloadAnchor.click();
    },
    getPgn: function() {
      let pgn = "";
      pgn += '[Site "vchess.club"]\n';
      const opponent = (this.mode=="human" ? "Anonymous" : "Computer");
      pgn += '[Variant "' + this.variant.name + '"]\n';
      pgn += '[Date "' + getDate(new Date()) + '"]\n';
      const whiteName = ["human","computer"].includes(this.mode)
        ? (this.mycolor=='w'?'Myself':opponent)
        : "analyze";
      const blackName = ["human","computer"].includes(this.mode)
        ? (this.mycolor=='b'?'Myself':opponent)
        : "analyze";
      pgn += '[White "' + whiteName + '"]\n';
      pgn += '[Black "' + blackName + '"]\n';
      pgn += '[Fen "' + this.fenStart + '"]\n';
      pgn += '[Result "' + this.score + '"]\n\n';
      let counter = 1;
      let i = 0;
      while (i < this.moves.length)
      {
        pgn += (counter++) + ".";
        for (let color of ["w","b"])
        {
          let move = "";
          while (i < this.moves.length && this.moves[i].color == color)
            move += this.moves[i++].notation[0] + ",";
          move = move.slice(0,-1); //remove last comma
          pgn += move + (i < this.moves.length-1 ? " " : "");
        }
      }
      return pgn + "\n";
    },
    showScoreMsg: function(score) {
      this.setEndgameMessage(score);
      let modalBox = document.getElementById("modal-eog");
      modalBox.checked = true;
      setTimeout(() => { modalBox.checked = false; }, 2000);
    },
    endGame: function(score) {
      this.score = score;
      this.showScoreMsg(score);
      if (this.mode == "human")
        localStorage["score"] = score;
      this.$emit("game-over");
    },
    oppConnected: function(uid) {
      return this.opponents.any(o => o.id == uidi && o.online);
    },
    playComputerMove: function() {
      this.timeStart = Date.now();
      this.compWorker.postMessage(["askmove"]);
    },
    animateMove: function(move) {
      let startSquare = document.getElementById(getSquareId(move.start));
      let endSquare = document.getElementById(getSquareId(move.end));
      let rectStart = startSquare.getBoundingClientRect();
      let rectEnd = endSquare.getBoundingClientRect();
      let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
      let movingPiece =
        document.querySelector("#" + getSquareId(move.start) + " > img.piece");
      // HACK for animation (with positive translate, image slides "under background")
      // Possible improvement: just alter squares on the piece's way...
      const squares = document.getElementsByClassName("board");
      for (let i=0; i<squares.length; i++)
      {
        let square = squares.item(i);
        if (square.id != getSquareId(move.start))
          square.style.zIndex = "-1";
      }
      movingPiece.style.transform = "translate(" + translation.x + "px," +
        translation.y + "px)";
      movingPiece.style.transitionDuration = "0.2s";
      movingPiece.style.zIndex = "3000";
      setTimeout( () => {
        for (let i=0; i<squares.length; i++)
          squares.item(i).style.zIndex = "auto";
        movingPiece.style = {}; //required e.g. for 0-0 with KR swap
        this.play(move);
      }, 250);
    },
    play: function(move, programmatic) {
      let navigate = !move;
      // Forbid playing outside analyze mode when cursor isn't at moves.length-1
      // (except if we receive opponent's move, human or computer)
      if (!navigate && this.mode != "analyze" && !programmatic
        && this.cursor < this.moves.length-1)
      {
        return;
      }
      if (navigate)
      {
        if (this.cursor == this.moves.length-1)
          return; //no more moves
        move = this.moves[this.cursor+1];
      }
      if (!!programmatic) //computer or (remote) human opponent
      {
        if (this.cursor < this.moves.length-1)
          this.gotoEnd(); //required to play the move
        return this.animateMove(move);
      }
      // Not programmatic, or animation is over
      if (this.mode == "human" && this.subMode == "corr" && this.mycolor == this.vr.turn)
      {
        // TODO: show confirm box "validate move ?"
      }
      if (!move.notation)
        move.notation = this.vr.getNotation(move);
      if (!move.color)
        move.color = this.vr.turn;
      this.vr.play(move);
      this.cursor++;
      this.lastMove = move;
      if (!move.fen)
        move.fen = this.vr.getFen();
      if (this.st.settings.sound == 2)
        new Audio("/sounds/move.mp3").play().catch(err => {});
      if (this.mode == "human")
      {
        updateStorage(move); //after our moves and opponent moves
        if (this.vr.turn == this.mycolor)
          this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
      }
      else if (this.mode == "computer")
      {
        // Send the move to web worker (including his own moves)
        this.compWorker.postMessage(["newmove",move]);
      }
      if (!navigate && (this.score == "*" || this.mode == "analyze"))
      {
        // Stack move on movesList at current cursor
        if (this.cursor == this.moves.length)
          this.moves.push(move);
        else
          this.moves = this.moves.slice(0,this.cursor).concat([move]);
      }
      // Is opponent in check?
      this.incheck = this.vr.getCheckSquares(this.vr.turn);
      const score = this.vr.getCurrentScore();
      if (score != "*")
      {
        if (["human","computer"].includes(this.mode))
          this.endGame(score);
        else //just show score on screen (allow undo)
          this.showScoreMsg(score);
      }
      // subTurn condition for Marseille (and Avalanche) rules
      else if ((this.mode == "computer" && (!this.vr.subTurn || this.vr.subTurn <= 1))
        && (this.subMode == "auto" || this.vr.turn != this.mycolor))
      {
        this.playComputerMove();
      }
      // https://vuejs.org/v2/guide/list.html#Caveats (also for undo)
      if (navigate)
        this.$children[0].$forceUpdate(); //TODO!?
    },
    undo: function(move) {
      let navigate = !move;
      if (navigate)
      {
        if (this.cursor < 0)
          return; //no more moves
        move = this.moves[this.cursor];
      }
      this.vr.undo(move);
      this.cursor--;
      this.lastMove = (this.cursor >= 0 ? this.moves[this.cursor] : undefined);
      if (this.st.settings.sound == 2)
        new Audio("/sounds/undo.mp3").play().catch(err => {});
      this.incheck = this.vr.getCheckSquares(this.vr.turn);
      if (navigate)
        this.$children[0].$forceUpdate(); //TODO!?
      else if (this.mode == "analyze") //TODO: can this happen?
        this.moves.pop();
    },
    gotoMove: function(index) {
      this.vr = new V(this.moves[index].fen);
      this.cursor = index;
      this.lastMove = this.moves[index];
    },
    gotoBegin: function() {
      this.vr = new V(this.fenStart);
      this.cursor = -1;
      this.lastMove = null;
    },
    gotoEnd: function() {
      this.gotoMove(this.moves.length-1);
    },
    flip: function() {
      this.orientation = V.GetNextCol(this.orientation);
    },
  },
};
</script>