chore: refactor code for type safety

lib/leaderboard.ts

@@ -0,0 +1,32 @@
+export interface BoardData {
+  id: string;
+  name: string;
+  points: number;
+}
+
+export const getTopThree = (boardData: BoardData[]) => {
+  if (!boardData || boardData.length === 0) return [];
+  return boardData
+    .slice()
+    .sort((a, b) => b.points - a.points)
+    .slice(0, 3)
+    .map((player, index) => ({
+      ...player,
+      rank: index + 1,
+      height: index === 0 ? 250 : index === 1 ? 200 : 170,
+    }));
+};
+
+export const getLeaderboard = (boardData: BoardData[]) => {
+  return boardData.slice().sort((a, b) => b.points - a.points);
+};
+
+export const getUserData = (boardData: BoardData[], name: string) => {
+  if (!boardData || !Array.isArray(boardData)) return [];
+  const sortedData = boardData
+    .filter((player) => player?.name && player?.points !== undefined)
+    .sort((a, b) => b.points - a.points);
+
+  const result = sortedData.find((player) => player.name === name);
+  return result ? [{ ...result, rank: sortedData.indexOf(result) + 1 }] : [];
+};