standardize mobile api transport for gyms and core services

apps/mobile/src/api/gyms.ts

@@ -0,0 +1,56 @@
+import { isAxiosError } from "axios";
+import { API_ENDPOINTS } from "../config/api";
+import { apiClient, withAuth } from "./client";
+
+export interface Gym {
+  id: string;
+  name: string;
+  location?: string;
+}
+
+export const gymsApi = {
+  getGyms: async (token: string | null): Promise<Gym[]> => {
+    try {
+      const response = await apiClient.get<Gym[] | { data?: Gym[] }>(
+        API_ENDPOINTS.GYMS,
+        withAuth(token),
+      );
+
+      const payload = response.data;
+      if (Array.isArray(payload)) {
+        return payload;
+      }
+
+      if (payload && Array.isArray(payload.data)) {
+        return payload.data;
+      }
+
+      return [];
+    } catch (error) {
+      if (isAxiosError(error) && error.response) {
+        throw new Error(`Failed to fetch gyms: ${error.response.status}`);
+      }
+      throw new Error("Failed to fetch gyms");
+    }
+  },
+
+  updateUserGym: async (
+    gymId: string | null,
+    token: string | null,
+  ): Promise<void> => {
+    try {
+      await apiClient.patch(
+        API_ENDPOINTS.USERS.GYM,
+        { gymId },
+        withAuth(token),
+      );
+    } catch (error) {
+      if (isAxiosError(error) && error.response) {
+        throw new Error(
+          `Failed to update gym selection: ${error.response.status}`,
+        );
+      }
+      throw new Error("Failed to update gym selection");
+    }
+  },
+};