Store state of games VS computer

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

diff --git a/client/src/utils/compgameStorage.js b/client/src/utils/compgameStorage.js
new file mode 100644 (file)
index 0000000..05a2074
--- /dev/null
+++ b/client/src/utils/compgameStorage.js
@@ -0,0 +1,85 @@
+// (Comp)Game object: {
+//   // Static informations:
+//   vname: string (this is the ID)
+//   fenStart: string,
+//   mycolor: "w" or "b"
+//   // Game (dynamic) state:
+//   fen: string,
+//   moves: array of Move objects,
+// }
+
+import { store } from "@/store";
+
+function dbOperation(callback) {
+  let db = null;
+  let DBOpenRequest = window.indexedDB.open("vchess_comp", 4);
+
+  DBOpenRequest.onerror = function(event) {
+    alert(store.state.tr["Database error: stop private browsing, or update your browser"]);
+    callback("error",null);
+  };
+
+  DBOpenRequest.onsuccess = function(event) {
+    db = DBOpenRequest.result;
+    callback(null,db);
+    db.close();
+  };
+
+  DBOpenRequest.onupgradeneeded = function(event) {
+    let db = event.target.result;
+    let objectStore = db.createObjectStore("compgames", { keyPath: "vname" });
+  };
+}
+
+export const CompgameStorage = {
+  add: function(game) {
+    dbOperation((err,db) => {
+      if (err)
+        return;
+      let transaction = db.transaction("compgames", "readwrite");
+      let objectStore = transaction.objectStore("compgames");
+      objectStore.add(game);
+    });
+  },
+
+  // obj: move and/or fen
+  update: function(gameId, obj) {
+    dbOperation((err,db) => {
+      let objectStore = db
+        .transaction("compgames", "readwrite")
+        .objectStore("compgames");
+      objectStore.get(gameId).onsuccess = function(event) {
+        // Ignoring error silently: shouldn't happen now. TODO?
+        if (event.target.result) {
+          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 any game from its identifier (variant name)
+  // NOTE: need callback because result is obtained asynchronously
+  get: function(gameId, callback) {
+    dbOperation((err,db) => {
+      let objectStore = db.transaction("compgames").objectStore("compgames");
+      objectStore.get(gameId).onsuccess = function(event) {
+        callback(event.target.result);
+      };
+    });
+  },
+
+  // Delete a game in indexedDB
+  remove: function(gameId) {
+    dbOperation((err,db) => {
+      if (!err) {
+        let transaction = db.transaction(["compgames"], "readwrite");
+        transaction.objectStore("compgames").delete(gameId);
+      }
+    });
+  }
+};