1@HiltViewModel
2class SharedCartViewModel @Inject constructor(
3    private val repository: CartRepository
4) : ViewModel() {
5
6    val cartItems = MutableStateFlow<List<CartItem>>(emptyList())
7
8    fun addItem(item: CartItem) {
9        cartItems.update { it + item }
10        viewModelScope.launch {
11            repository.syncCart(cartItems.value)
12        }
13    }
14
15    fun clearCart() {
16        cartItems.value = emptyList()
17    }
18}
19
20@AndroidEntryPoint
21class ProductFragment : Fragment() {
22    private val cartViewModel: SharedCartViewModel by viewModels()
23
24    fun onAddToCart(item: CartItem) {
25        cartViewModel.addItem(item)
26    }
27}
28
29@AndroidEntryPoint
30class CartFragment : Fragment() {
31    private val cartViewModel: SharedCartViewModel by viewModels()
32
33    fun onCheckout() {
34        // Process cart...
35        cartViewModel.clearCart()
36    }
37}