feat: stats system to see number of nukes sent by a player in PlayerPanel

src/core/game/StatsImpl.ts

@@ -0,0 +1,34 @@
+import { NukeType, Player, PlayerID, UnitType } from "./Game";
+import { PlayerStats, Stats } from "./Stats";
+
+interface StatsInternalData {
+  // player
+  [key: PlayerID]: PlayerStats;
+}
+
+export class StatsImpl implements Stats {
+  data: StatsInternalData = {};
+
+  _createUserData(sender: PlayerID, target: PlayerID): void {
+    if (!this.data[sender]) {
+      this.data[sender] = { sentNukes: {} };
+    }
+    if (!this.data[sender].sentNukes[target]) {
+      this.data[sender].sentNukes[target] = {
+        [UnitType.MIRV]: 0,
+        [UnitType.MIRVWarhead]: 0,
+        [UnitType.AtomBomb]: 0,
+        [UnitType.HydrogenBomb]: 0,
+      };
+    }
+  }
+
+  increaseNukeCount(sender: PlayerID, target: PlayerID, type: NukeType): void {
+    this._createUserData(sender, target);
+    this.data[sender].sentNukes[target][type]++;
+  }
+
+  getPlayerStats(player: PlayerID): PlayerStats {
+    return this.data[player];
+  }
+}