feat: implement UsersContext and refactor user management hooks for improved user data handling

src/context/UsersContext.js

@@ -0,0 +1,93 @@
+import React, { createContext, useState, useContext, useEffect, useCallback, useMemo } from 'react';
+import { toast } from 'sonner';
+import api from '../utils/api';
+
+const UsersContext = createContext();
+
+// Role definitions
+const STAFF_ROLES = ['admin', 'superadmin', 'finance'];
+const MEMBER_ROLES = ['member'];
+
+export const UsersProvider = ({ children }) => {
+  const [users, setUsers] = useState([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(null);
+
+  const fetchUsers = useCallback(async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      const response = await api.get('/admin/users');
+      setUsers(response.data);
+    } catch (err) {
+      setError(err);
+      toast.error('Failed to fetch users');
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    fetchUsers();
+  }, [fetchUsers]);
+
+  // Filtered views based on role
+  const staff = useMemo(
+    () => users.filter(user => STAFF_ROLES.includes(user.role)),
+    [users]
+  );
+
+  const members = useMemo(
+    () => users.filter(user => MEMBER_ROLES.includes(user.role)),
+    [users]
+  );
+
+  const allUsers = users;
+
+  // Update a single user in the local state (useful after edits)
+  const updateUser = useCallback((updatedUser) => {
+    setUsers(prev => prev.map(user =>
+      user.id === updatedUser.id ? updatedUser : user
+    ));
+  }, []);
+
+  // Remove a user from local state
+  const removeUser = useCallback((userId) => {
+    setUsers(prev => prev.filter(user => user.id !== userId));
+  }, []);
+
+  // Add a user to local state
+  const addUser = useCallback((newUser) => {
+    setUsers(prev => [...prev, newUser]);
+  }, []);
+
+  return (
+    <UsersContext.Provider value={{
+      // All data
+      users: allUsers,
+      staff,
+      members,
+      // State
+      loading,
+      error,
+      // Actions
+      refetch: fetchUsers,
+      updateUser,
+      removeUser,
+      addUser,
+    }}>
+      {children}
+    </UsersContext.Provider>
+  );
+};
+
+// Base hook to access the context
+export const useUsers = () => {
+  const context = useContext(UsersContext);
+  if (!context) {
+    throw new Error('useUsers must be used within a UsersProvider');
+  }
+  return context;
+};
+
+export default UsersContext;