Modifs to send current live game

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

// Game object: {
//   // Static informations:
//   gameId: string
//   vname: string,
//   fenStart: string,
//   players: array of sid+id+name,
//   timeControl: 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),
// }

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

  DBOpenRequest.onerror = function(event) {
    alert("Database error: " + event.target.errorCode);
  };

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

  DBOpenRequest.onupgradeneeded = function(event) {
    let db = event.target.result;
    db.onerror = function(event) {
      alert("Error while loading database: " + event.target.errorCode);
    };
    // Create objectStore for vchess->games
    let objectStore = db.createObjectStore("games", { keyPath: "gameId" });
    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: "addGame failed: " + transaction.error});
        };
      }
      let objectStore = transaction.objectStore("games");
      objectStore.add(game);
    });
  },

  // TODO: also option to takeback a move ?
  // NOTE: for live games only (all on server for corr)
  update: function(gameId, obj) //colorIdx, nextIdx, move, fen, addTime, score
  {
    dbOperation((db) => {
      let objectStore = db.transaction("games", "readwrite").objectStore("games");
      objectStore.get(gameId).onsuccess = function(event) {
        const game = event.target.result;
        if (!!obj.move)
        {
          game.moves.push(obj.move);
          game.fen = obj.fen;
          if (!!obj.addTime) //NaN if first move in game
            game.clocks[obj.colorIdx] += obj.addTime;
          game.initime[obj.nextIdx] = Date.now();
        }
        if (!!obj.score)
          game.score = obj.score;
        objectStore.put(game); //save updated data
      }
    });
  },

  // Retrieve any live game from its identifiers (locally, running or not)
  // NOTE: need callback because result is obtained asynchronously
  get: function(gameId, callback)
  {
    dbOperation((db) => {
      let objectStore = db.transaction('games').objectStore('games');
      if (!gameId) //retrieve all
      {
        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);
        }
      }
      else //just one game
      {
        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: "removeGame failed: " + transaction.error});
        };
      }
      transaction.objectStore("games").delete(gameId);
    });
  },
};