feat: persist club and center likes in postgresql database

src/services/clubService.ts

@@ -0,0 +1,83 @@
+import { getBackendUrl } from '@/lib/utils';
+
+const DEVICE_ID_KEY = 'rit_device_identifier';
+
+/**
+ * Gets a persistent user identifier for likes.
+ * If user is authenticated, uses email. Otherwise uses a persistent UUID in localStorage.
+ */
+export function getClubUserIdentifier(userEmail?: string | null): string {
+  if (userEmail && userEmail.trim()) {
+    return userEmail.trim().toLowerCase();
+  }
+
+  try {
+    let deviceId = localStorage.getItem(DEVICE_ID_KEY);
+    if (!deviceId) {
+      deviceId = 'guest_' + Math.random().toString(36).substring(2, 11) + Date.now().toString(36);
+      localStorage.setItem(DEVICE_ID_KEY, deviceId);
+    }
+    return deviceId;
+  } catch {
+    return 'guest_fallback_user';
+  }
+}
+
+/**
+ * Fetch total counts of likes for all clubs & centers from database
+ */
+export async function fetchClubLikes(): Promise<Record<string, number>> {
+  try {
+    const res = await fetch(getBackendUrl('/api/clubs/likes'));
+    if (!res.ok) {
+      throw new Error(`Failed to fetch likes: ${res.status}`);
+    }
+    const data = await res.json();
+    return data || {};
+  } catch (err) {
+    console.warn('Unable to fetch club likes from database backend:', err);
+    return {};
+  }
+}
+
+/**
+ * Fetch user's liked club IDs from database
+ */
+export async function fetchUserLikedClubs(userIdentifier: string): Promise<string[]> {
+  try {
+    const res = await fetch(
+      getBackendUrl(`/api/clubs/user-likes?userIdentifier=${encodeURIComponent(userIdentifier)}`)
+    );
+    if (!res.ok) {
+      throw new Error(`Failed to fetch user likes: ${res.status}`);
+    }
+    const data = await res.json();
+    return Array.isArray(data) ? data : [];
+  } catch (err) {
+    console.warn('Unable to fetch user liked clubs from database backend:', err);
+    return [];
+  }
+}
+
+/**
+ * Toggle like status for a club/center in database
+ */
+export async function toggleClubLikeInDb(
+  clubId: string,
+  userIdentifier: string
+): Promise<{ liked: boolean; count: number } | null> {
+  try {
+    const res = await fetch(getBackendUrl(`/api/clubs/${encodeURIComponent(clubId)}/like`), {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ userIdentifier }),
+    });
+    if (!res.ok) {
+      throw new Error(`Toggle like failed: ${res.status}`);
+    }
+    return await res.json();
+  } catch (err) {
+    console.warn(`Failed to persist like for club ${clubId} in database:`, err);
+    return null;
+  }
+}