Started code review + some fixes (unfinished)

[vchess.git] / client / src / utils / gameStorage.js

// Game object: {
//   // Static informations:
//   id: string
//   vname: string,
//   fenStart: string,
//   players: array of sid+id+name,
//   cadence: string,
//   increment: integer (seconds),
//   mode: string ("live" or "corr")
//   imported: boolean (optional, default false)
//   // Game (dynamic) state:
//   fen: string,
//   moves: array of Move objects,
//   clocks: array of integers,
//   initime: array of integers (when clock start running),
//   score: string (several options; '*' == running),
// }

import { ajax } from "@/utils/ajax";
import { store } from "@/store";

function dbOperation(callback) {
  let db = null;
  let DBOpenRequest = window.indexedDB.open("vchess", 4);

  DBOpenRequest.onerror = function(event) {
    alert(store.state.tr["Database error:"] + " " + event.target.errorCode);
  };

  DBOpenRequest.onsuccess = function() {
    db = DBOpenRequest.result;
    callback(db);
    db.close();
  };

  DBOpenRequest.onupgradeneeded = function(event) {
    let db = event.target.result;
    db.onerror = function(event) {
      alert(
        store.state.tr["Error while loading database:"] +
          " " +
          event.target.errorCode
      );
    };
    // Create objectStore for vchess->games
    let objectStore = db.createObjectStore("games", { keyPath: "id" });
    objectStore.createIndex("score", "score"); //to search by game result
  };
}

export const GameStorage = {
  // Optional callback to get error status
  add: function(game, callback) {
    dbOperation(db => {
      let transaction = db.transaction("games", "readwrite");
      if (callback) {
        transaction.oncomplete = function() {
          callback({}); //everything's fine
        };
        transaction.onerror = function() {
          callback({
            errmsg:
              store.state.tr["Game retrieval failed:"] + " " + transaction.error
          });
        };
      }
      let objectStore = transaction.objectStore("games");
      objectStore.add(game);
    });
  },

  // TODO: also option to takeback a move ?
  // obj: chat, move, fen, clocks, score[Msg], initime, ...
  update: function(gameId, obj) {
    if (Number.isInteger(gameId) || !isNaN(parseInt(gameId))) {
      // corr: only move, fen and score
      ajax("/games", "PUT", {
        gid: gameId,
        newObj: {
          // Some fields may be undefined:
          chat: obj.chat,
          move: obj.move,
          fen: obj.fen,
          score: obj.score,
          scoreMsg: obj.scoreMsg,
          drawOffer: obj.drawOffer
        }
      });
    } else {
      // live
      dbOperation(db => {
        let objectStore = db
          .transaction("games", "readwrite")
          .objectStore("games");
        objectStore.get(gameId).onsuccess = function(event) {
          const game = event.target.result;
          Object.keys(obj).forEach(k => {
            if (k == "move") game.moves.push(obj[k]);
            else game[k] = obj[k];
          });
          objectStore.put(game); //save updated data
        };
      });
    }
  },

  // Retrieve all local games (running, completed, imported...)
  getAll: function(callback) {
    dbOperation(db => {
      let objectStore = db.transaction("games").objectStore("games");
      let games = [];
      objectStore.openCursor().onsuccess = function(event) {
        let cursor = event.target.result;
        // if there is still another cursor to go, keep running this code
        if (cursor) {
          games.push(cursor.value);
          cursor.continue();
        } else callback(games);
      };
    });
  },

  // Retrieve any game from its identifiers (locally or on server)
  // NOTE: need callback because result is obtained asynchronously
  get: function(gameId, callback) {
    // corr games identifiers are integers
    if (Number.isInteger(gameId) || !isNaN(parseInt(gameId))) {
      ajax("/games", "GET", { gid: gameId }, res => {
        let game = res.game;
        game.moves.forEach(m => {
          m.squares = JSON.parse(m.squares);
        });
        callback(game);
      });
    } //local game
    else {
      dbOperation(db => {
        let objectStore = db.transaction("games").objectStore("games");
        objectStore.get(gameId).onsuccess = function(event) {
          callback(event.target.result);
        };
      });
    }
  },

  getCurrent: function(callback) {
    dbOperation(db => {
      let objectStore = db.transaction("games").objectStore("games");
      objectStore.get("*").onsuccess = function(event) {
        callback(event.target.result);
      };
    });
  },

  // Delete a game in indexedDB
  remove: function(gameId, callback) {
    dbOperation(db => {
      let transaction = db.transaction(["games"], "readwrite");
      if (callback) {
        transaction.oncomplete = function() {
          callback({}); //everything's fine
        };
        transaction.onerror = function() {
          callback({
            errmsg:
              store.state.tr["Game removal failed:"] + " " + transaction.error
          });
        };
      }
      transaction.objectStore("games").delete(gameId);
    });
  }
};