Repository: lambda-curry/medusa2-starter
Pull request #48: feat(cart): refactor CartDrawer component and enhance useCart hook
Author: login: jaruesink
Created: 2025-03-14T22:57:45Z | Merged: 2025-03-14T23:13:30Z

- Introduced modular components for CartDrawer: CartDrawerHeader, CartDrawerContent, CartDrawerEmpty, CartDrawerLoading, CartDrawerItems, and CartDrawerFooter for better readability and maintainability.
- Enhanced useCart hook to manage cart state and loading states more effectively, including handling last item removal and drawer toggle logic.
- Added loading and empty states to the CartDrawer for improved user experience.
- Created a design document outlining the architecture and requirements for the cart drawer system.

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Enhanced the cart drawer interface with clear sections for header, empty state, loading indicators, item display, and footer with a responsive checkout button.
  - Improved the add-to-cart workflow to provide more immediate and clear feedback during form submission.

- **Refactor**
  - Streamlined state management for cart interactions, ensuring smoother transitions and a more reliable shopping experience.
  - Modularized the cart drawer component structure for better readability and maintainability.
  - Updated form submission handling for improved clarity and reusability.
  - Introduced new design documentation outlining the cart drawer system's requirements and architecture.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->


Diff:
diff --git a/apps/storefront/app/components/cart/CartDrawer.tsx b/apps/storefront/app/components/cart/CartDrawer.tsx
index c6e15f5ae..abd8ec926 100644
--- a/apps/storefront/app/components/cart/CartDrawer.tsx
+++ b/apps/storefront/app/components/cart/CartDrawer.tsx
@@ -1,168 +1,228 @@
-import { FC, Fragment, PropsWithChildren, useEffect } from 'react';
-import { Dialog, Transition } from '@headlessui/react';
+import { FC, Fragment, useCallback, useState, useEffect } from 'react';
+import { Dialog, DialogPanel, DialogTitle, DialogBackdrop } from '@headlessui/react';
 import XMarkIcon from '@heroicons/react/24/outline/XMarkIcon';
-import { CartDrawerItem } from './CartDrawerItem';
 import { formatCartSubtotal, formatPrice } from '@libs/util/prices';
 import { useCart } from '@app/hooks/useCart';
 import { IconButton } from '@app/components/common/buttons/IconButton';
 import { ButtonLink } from '@app/components/common/buttons/ButtonLink';
 import { Button } from '@app/components/common/buttons/Button';
-import { useNavigate } from '@remix-run/react';
+import { useNavigate, useFetchers } from '@remix-run/react';
 import { useRegion } from '@app/hooks/useRegion';
+import { CartDrawerItem } from './CartDrawerItem';
+
+// Cart Drawer Header Component
+const CartDrawerHeader: FC<{ itemCount: number; onClose: () => void }> = ({ itemCount, onClose }) => (
+  <div className="flex items-start justify-between">
+    <DialogTitle className="text-lg font-bold text-gray-900">
+      My Cart{' '}
+      {itemCount > 0 && (
+        <span className="pl-2">
+          ({itemCount} item{itemCount > 1 ? 's' : ''})
+        </span>
+      )}
+    </DialogTitle>
+    <div className="ml-3 flex h-7 items-center">
+      <IconButton icon={XMarkIcon} onClick={onClose} className="-m-2" aria-label="Close panel" />
+    </div>
+  </div>
+);
+
+// Cart Drawer Empty Component
+const CartDrawerEmpty: FC = () => <p className="text-center text-sm text-gray-500">Looks like your cart is empty!</p>;
+
+// Cart Drawer Loading Component
+const CartDrawerLoading: FC = () => (
+  <li className="py-6 list-none">
+    <div className="flex animate-pulse space-x-4">
+      <div className="h-24 w-24 rounded-md bg-slate-300" />
+      <div className="flex h-24 w-full flex-1 flex-col space-y-3 py-1">
+        <div className="grid grid-cols-3 gap-4">
+          <div className="col-span-2 h-2 rounded bg-slate-300" />
+          <div className="col-span-1 h-2 rounded bg-slate-300" />
+        </div>
+        <div className="h-2 rounded bg-slate-300" />
+        <div className="flex-1" />
+        <div className="grid grid-cols-4 gap-4">
+          <div className="col-span-1 h-2 rounded bg-slate-300" />
+          <div className="col-span-2" />
+          <div className="col-span-1 h-2 rounded bg-slate-300" />
+        </div>
+      </div>
+    </div>
+  </li>
+);
+
+// Cart Drawer Items Component
+const CartDrawerItems: FC<{
+  items: any[];
+  isRemovingItemId?: string;
+  currencyCode: string;
+}> = ({ items, isRemovingItemId, currencyCode }) => (
+  <ul className="-my-6 divide-y divide-gray-200 list-none">
+    {items.map((item) => (
+      <CartDrawerItem key={item.id} isRemoving={isRemovingItemId === item.id} item={item} currencyCode={currencyCode} />
+    ))}
+  </ul>
+);
+
+// Cart Drawer Content Component
+const CartDrawerContent: FC<{
+  items: any[];
+  isRemovingItemId?: string;
+  isAddingItem: boolean;
+  showEmptyCartMessage: boolean;
+  isRemovingLastItem: boolean;
+  currencyCode: string;
+}> = ({ items, isRemovingItemId, isAddingItem, showEmptyCartMessage, isRemovingLastItem, currencyCode }) => (
+  <div className="mt-8">
+    <div className="flow-root">
+      {/* Show empty cart message when cart is empty and not loading */}
+      {(showEmptyCartMessage || isRemovingLastItem) && <CartDrawerEmpty />}
 
-export const CartDrawer: FC<PropsWithChildren> = () => {
+      {/* Show items when there are items in the cart */}
+      {items.length > 0 && !isRemovingLastItem && (
+        <CartDrawerItems items={items} isRemovingItemId={isRemovingItemId} currencyCode={currencyCode} />
+      )}
+
+      {/* Show loading item when adding items but not when removing the last item */}
+      {isAddingItem && !isRemovingLastItem && <CartDrawerLoading />}
+    </div>
+  </div>
+);
+
+// Cart Drawer Footer Component
+const CartDrawerFooter: FC<{
+  cart: any;
+  currencyCode: string;
+  itemCount: number;
+  isAddingItem: boolean;
+  isRemovingLastItem: boolean;
+  onCheckout: () => void;
+  onClose: () => void;
+}> = ({ cart, currencyCode, itemCount, isAddingItem, isRemovingLastItem, onCheckout, onClose }) => (
+  <div className="border-t border-gray-200 px-4 py-6 sm:px-6">
+    <div className="flex justify-between text-base font-bold text-gray-900">
+      <p>Subtotal</p>
+      <p>
+        {cart
+          ? formatCartSubtotal(cart)
+          : formatPrice(0, {
+              currency: currencyCode,
+            })}
+      </p>
+    </div>
+    <p className="mt-0.5 text-sm text-gray-500">Shipping and taxes calculated at checkout.</p>
+    <div className="mt-6">
+      <Button
+        variant="primary"
+        disabled={itemCount === 0 || isRemovingLastItem}
+        onClick={onCheckout}
+        className="h-12 w-full !text-base font-bold"
+      >
+        Checkout
+      </Button>
+    </div>
+    <div className="mt-4 flex justify-center text-center text-sm text-gray-500">
+      <p>
+        or{' '}
+        <ButtonLink size="sm" onClick={onClose}>
+          <div>
+            Continue Shopping{` `}
+            <span aria-hidden="true">&rarr;</span>
+          </div>
+        </ButtonLink>
+      </p>
+    </div>
+  </div>
+);
+
+export const CartDrawer: FC = () => {
   const navigate = useNavigate();
-  const { cart, cartDrawerOpen, toggleCartDrawer, isAddingItem, isRemovingItemId } = useCart();
+  const {
+    cart,
+    cartDrawerOpen,
+    toggleCartDrawer,
+    isAddingItem,
+    isRemovingItemId,
+    isRemovingLastItem,
+    showEmptyCartMessage,
+  } = useCart();
   const { region } = useRegion();
-  let lineItems = cart?.items ?? [];
-  let lineItemsCount = lineItems.length;
+  const allFetchers = useFetchers();
+
+  // Track if any cart-related fetchers are active
+  const isCartLoading = allFetchers.some(
+    (f) =>
+      (f.state === 'submitting' || f.state === 'loading') &&
+      (f.formAction?.includes('/api/cart') || f.formData?.get('action') === 'add-to-cart'),
+  );
+
+  // Local state to control the dialog - initialize with cartDrawerOpen
+  const [isOpen, setIsOpen] = useState(false);
+
+  // Sync our local state with the cart drawer state
+  useEffect(() => {
+    setIsOpen(cartDrawerOpen === true);
+  }, [cartDrawerOpen]);
+
+  const lineItems = cart?.items ?? [];
   const lineItemsTotal = lineItems.reduce((acc, item) => acc + item.quantity, 0);
-  const isRemovingLastItem = lineItems.length === 1 && isRemovingItemId === lineItems[0].id;
 
-  const handleCheckoutClick = () => {
+  const handleCheckoutClick = useCallback(() => {
     navigate('/checkout');
-    toggleCartDrawer();
-  };
+    toggleCartDrawer(false);
+  }, [navigate, toggleCartDrawer]);
 
-  useEffect(() => {
-    if (lineItemsCount < 1 || isRemovingLastItem) toggleCartDrawer(false);
-  }, [lineItemsCount]);
+  const handleClose = useCallback(() => {
+    toggleCartDrawer(false);
+  }, [toggleCartDrawer]);
 
   return (
-    <Transition.Root show={!!cartDrawerOpen} as={Fragment}>
-      <Dialog as="div" className="relative z-50" onClose={() => toggleCartDrawer(false)}>
-        <Transition.Child
-          as={Fragment}
-          enter="ease-in-out duration-200"
-          enterFrom="opacity-0"
-          enterTo="opacity-100"
-          leave="ease-in-out duration-200"
-          leaveFrom="opacity-100"
-          leaveTo="opacity-0"
-        >
-          <div className="fixed inset-0 bg-gray-300 bg-opacity-50 backdrop-blur-sm transition-opacity" />
-        </Transition.Child>
-
-        <div className="fixed inset-0 overflow-hidden">
-          <div className="absolute inset-0 overflow-hidden">
-            <div className="pointer-events-none fixed inset-y-0 right-0 flex max-w-full pl-10">
-              <Transition.Child
-                as={Fragment}
-                enter="transform transition ease-in-out duration-200"
-                enterFrom="translate-x-full"
-                enterTo="translate-x-0"
-                leave="transform transition ease-in-out duration-200"
-                leaveFrom="translate-x-0"
-                leaveTo="translate-x-full"
-              >
-                <Dialog.Panel className="pointer-events-auto w-screen max-w-md">
-                  <div className="flex h-full flex-col overflow-y-scroll bg-white shadow-xl">
-                    <div className="flex-1 overflow-y-auto px-4 py-6 sm:px-6">
-                      <div className="flex items-start justify-between">
-                        <Dialog.Title className="text-lg font-bold text-gray-900">
-                          My Cart{' '}
-                          {lineItemsTotal > 0 && (
-                            <span className="pl-2">
-                              ({lineItemsTotal} item
-                              {lineItemsTotal > 1 ? 's' : ''})
-                            </span>
-                          )}
-                        </Dialog.Title>
-                        <div className="ml-3 flex h-7 items-center">
-                          <IconButton
-                            icon={XMarkIcon}
-                            onClick={() => toggleCartDrawer(false)}
-                            className="-m-2"
-                            aria-label="Close panel"
-                          />
-                        </div>
-                      </div>
-
-                      <div className="mt-8">
-                        <div className="flow-root">
-                          {((!isAddingItem && lineItems.length === 0) || isRemovingLastItem) && (
-                            <p className="text-center text-sm text-gray-500">Looks like your cart is empty!</p>
-                          )}
-
-                          <ul className="-my-6 divide-y divide-gray-200">
-                            {lineItems.map((item) => {
-                              const isRemoving = isRemovingItemId === item.id;
-                              return (
-                                <CartDrawerItem
-                                  key={item.id}
-                                  isRemoving={isRemoving}
-                                  item={item}
-                                  currencyCode={region.currency_code}
-                                />
-                              );
-                            })}
-
-                            {isAddingItem && (
-                              <li className="py-6">
-                                <div className="flex animate-pulse space-x-4">
-                                  <div className="h-24 w-24  rounded-md bg-slate-300" />
-                                  <div className="flex h-24 w-full flex-1 flex-col space-y-3 py-1">
-                                    <div className="grid grid-cols-3 gap-4">
-                                      <div className="col-span-2 h-2 rounded bg-slate-300" />
-                                      <div className="col-span-1 h-2 rounded bg-slate-300" />
-                                    </div>
-                                    <div className="h-2 rounded bg-slate-300" />
-                                    <div className="flex-1" />
-                                    <div className="grid grid-cols-4 gap-4">
-                                      <div className="col-span-1 h-2 rounded bg-slate-300" />
-                                      <div className="col-span-2" />
-                                      <div className="col-span-1 h-2 rounded bg-slate-300" />
-                                    </div>
-                                  </div>
-                                </div>
-                              </li>
-                            )}
-                          </ul>
-                        </div>
-                      </div>
-                    </div>
-
-                    <div className="border-t border-gray-200 px-4 py-6 sm:px-6">
-                      <div className="flex justify-between text-base font-bold text-gray-900">
-                        <p>Subtotal</p>
-                        <p>
-                          {cart
-                            ? formatCartSubtotal(cart)
-                            : formatPrice(0, {
-                                currency: region.currency_code,
-                              })}
-                        </p>
-                      </div>
-                      <p className="mt-0.5 text-sm text-gray-500">Shipping and taxes calculated at checkout.</p>
-                      <div className="mt-6">
-                        <Button
-                          variant="primary"
-                          disabled={lineItems.length === 0}
-                          onClick={handleCheckoutClick}
-                          className="h-12 w-full !text-base font-bold"
-                        >
-                          Checkout
-                        </Button>
-                      </div>
-                      <div className="mt-4 flex justify-center text-center text-sm text-gray-500">
-                        <p>
-                          or{' '}
-                          <ButtonLink size="sm" onClick={() => toggleCartDrawer(false)}>
-                            <div>
-                              Continue Shopping{` `}
-                              <span aria-hidden="true">&rarr;</span>
-                            </div>
-                          </ButtonLink>
-                        </p>
-                      </div>
-                    </div>
-                  </div>
-                </Dialog.Panel>
-              </Transition.Child>
-            </div>
+    <Dialog open={isOpen} onClose={handleClose} className="relative z-50">
+      {/* Backdrop with transition */}
+      <DialogBackdrop
+        transition
+        className="fixed inset-0 bg-gray-300 bg-opacity-50 backdrop-blur-sm duration-300 ease-out data-[closed]:opacity-0"
+      />
+
+      <div className="fixed inset-0 overflow-hidden">
+        <div className="absolute inset-0 overflow-hidden">
+          <div className="pointer-events-none fixed inset-y-0 right-0 flex max-w-full pl-10">
+            {/* Panel with transition */}
+            <DialogPanel
+              transition
+              className="pointer-events-auto w-screen max-w-md transform duration-500 ease-in-out data-[closed]:translate-x-full"
+            >
+              <div className="flex h-full flex-col overflow-y-scroll bg-white shadow-xl">
+                {/* Content */}
+                <div className="flex-1 overflow-y-auto px-4 py-6 sm:px-6">
+                  <CartDrawerHeader itemCount={lineItemsTotal} onClose={handleClose} />
+
+                  <CartDrawerContent
+                    items={lineItems}
+                    isRemovingItemId={isRemovingItemId}
+                    isAddingItem={isAddingItem || isCartLoading}
+                    showEmptyCartMessage={showEmptyCartMessage}
+                    isRemovingLastItem={isRemovingLastItem}
+                    currencyCode={region.currency_code}
+                  />
+                </div>
+
+                {/* Footer */}
+                <CartDrawerFooter
+                  cart={cart}
+                  currencyCode={region.currency_code}
+                  itemCount={lineItemsTotal}
+                  isAddingItem={isAddingItem || isCartLoading}
+                  isRemovingLastItem={isRemovingLastItem}
+                  onCheckout={handleCheckoutClick}
+                  onClose={handleClose}
+                />
+              </div>
+            </DialogPanel>
           </div>
         </div>
-      </Dialog>
-    </Transition.Root>
+      </div>
+    </Dialog>
   );
 };
diff --git a/apps/storefront/app/components/cart/CartDrawerDesignDoc.md b/apps/storefront/app/components/cart/CartDrawerDesignDoc.md
new file mode 100644
index 000000000..6cce42908
--- /dev/null
+++ b/apps/storefront/app/components/cart/CartDrawerDesignDoc.md
@@ -0,0 +1,156 @@
+# Cart Drawer System Design Document
+
+This document outlines the requirements, behaviors, and architecture for the cart drawer system in our e-commerce application. It serves as both documentation and a guide for implementing or refactoring the cart drawer functionality.
+
+## Core Requirements
+
+The cart drawer is a fundamental component of the e-commerce user experience, providing immediate feedback when users interact with the shopping cart.
+
+### Opening Behaviors
+
+The cart drawer should open when:
+1. User explicitly opens it by clicking a cart icon
+2. User adds an item to the cart
+3. User modifies an item in the cart
+
+### Closing Behaviors
+
+The cart drawer should close when:
+1. User explicitly closes it by clicking the close button or backdrop
+2. User navigates to checkout
+3. User removes the last item from the cart
+4. Cart becomes empty (with animation)
+
+### Loading States
+
+Loading states should be shown when:
+1. Items are being added to the cart
+2. Items are being removed from the cart
+3. Cart is being updated
+4. Cart is empty but items are being added
+
+## First Principles Design
+
+To keep our implementation clean, maintainable, and predictable, we should follow these principles:
+
+### 1. Focused Responsibility
+
+Group related functionality together while keeping distinct concerns separate:
+- **Cart Data & Loading**: Keep cart data and its loading states together
+- **UI & Animations**: Separate presentation from business logic
+- **Drawer State**: Manage open/closed state independently
+
+### 2. Simplicity Over Complexity
+
+- Prefer fewer hooks with clear responsibilities over many specialized hooks
+- Group closely related state and behaviors together
+- Minimize prop drilling and state synchronization
+
+### 3. Predictable State Transitions
+
+Ensure state transitions are predictable and well-defined:
+- Define clear conditions for state changes
+- Use explicit, descriptive state variables
+- Avoid complex nested conditions
+
+## Simplified Implementation Architecture
+
+### Components Hierarchy
+
+```
+CartDrawer
+├── CartDrawerHeader
+├── CartDrawerContent
+│   ├── CartDrawerEmpty
+│   ├── CartDrawerLoading
+│   └── CartDrawerItems
+│       └── CartDrawerItem
+└── CartDrawerFooter
+    ├── CartDrawerSubtotal
+    └── CartDrawerActions
+```
+
+### Hooks Organization (Simplified)
+
+```
+useCart
+├── Cart data and operations
+├── Cart loading states
+└── Cart drawer toggle operations
+```
+
+## Implementation Approach
+
+### 1. Enhanced useCart Hook
+
+A combined hook for cart data, loading states, and drawer state management that handles:
+- Cart data from API/store
+- Drawer state management
+- Loading state management for adding/removing items
+- Automatic drawer closing when cart becomes empty
+- Tracking cart-related operations
+
+### 2. Animation-focused Hook (Optional)
+
+A dedicated hook for managing animations that handles:
+- Animation timing and state
+- Drawer opening/closing animations
+- Cleanup of animation timers
+
+### 3. Simplified Cart Drawer Component
+
+The main component that:
+- Uses the cart and animation hooks
+- Handles navigation to checkout
+- Renders appropriate cart states (empty, loading, items)
+- Manages transitions and dialogs
+
+## Benefits of This Approach
+
+### 1. Reduced Complexity
+
+- **Fewer Hooks**: Less coordination between multiple hooks reduces complexity
+- **Clear Data Flow**: State and its derived values are managed together
+- **Simplified API**: Fewer props and callbacks between components
+
+### 2. Better State Management
+
+- **Cohesive State**: Related state variables are managed together
+- **Reduced Synchronization**: Less need to keep separate hooks in sync
+- **Clearer Intent**: Functions and state are organized by domain
+
+### 3. Maintainability
+
+- **Easier Debugging**: State transitions are easier to track
+- **Simpler Component Logic**: Components focus on rendering, not state management
+- **Consolidated Logic**: Cart-related behaviors are in one place
+
+## Anti-Patterns to Avoid
+
+1. **Overly Complex Conditions**: Keep state transition logic simple and explicit
+2. **Timer Proliferation**: Manage timeouts carefully and clean them up properly
+3. **Deeply Nested Components**: Keep the component hierarchy flat when possible
+4. **Repeated Animation Logic**: Consolidate animation code in one place
+
+## Future Improvements
+
+- **State Machines**: Consider XState for complex state transitions
+- **Component Composition**: Use composition over configuration
+- **Memoization**: Optimize renders with useMemo and useCallback
+- **Animation Libraries**: Consider Framer Motion for complex animations
+
+---
+
+By adopting this simplified approach, we create a cart drawer system that is:
+- **Simpler**: Fewer hooks with clearer responsibilities
+- **More Maintainable**: Easier to understand and modify
+- **More Predictable**: Clearer state transitions
+- **More Performant**: Fewer re-renders and better state management
+
+---
+
+By following this design approach, we create a cart drawer system that is:
+- **Maintainable**: Clear separation of concerns
+- **Predictable**: Well-defined state transitions
+- **Performant**: Minimal re-renders and side effects
+- **Extensible**: Easy to add features without breaking existing functionality 
\ No newline at end of file
diff --git a/apps/storefront/app/hooks/useCart.ts b/apps/storefront/app/hooks/useCart.ts
index c5b34fc79..0add066b4 100644
--- a/apps/storefront/app/hooks/useCart.ts
+++ b/apps/storefront/app/hooks/useCart.ts
@@ -2,34 +2,133 @@ import { useFetchers } from '@remix-run/react';
 import { useRootLoaderData } from './useRootLoaderData';
 import { useStorefront } from './useStorefront';
 import { StoreCart } from '@medusajs/types';
+import { useState, useCallback, useRef, useEffect } from 'react';
 
+/**
+ * Enhanced useCart hook that combines cart data management and drawer state logic
+ * Following Remix patterns for state management
+ * @returns Cart data, state, and methods for managing the cart drawer
+ */
 export const useCart = () => {
   const { state, actions } = useStorefront();
   const data = useRootLoaderData();
   const fetchers = useFetchers();
-  const cartFetchers = fetchers.filter((f) => f.data?.cart);
-  const removingLineItemFetchers = fetchers.filter(
-    (f) => f.formData?.get('subaction') === 'deleteItem' && f.formData?.get('lineItemId'),
+
+  // Simplified cart drawer state
+  const [isRemovingLastItem, setIsRemovingLastItem] = useState(false);
+
+  // Refs for timers and state tracking
+  const timerRef = useRef<number | null>(null);
+  const prevItemCountRef = useRef<number>(0);
+
+  // Track cart-related fetchers
+  const cartFetchers = {
+    // Find any fetcher that's removing items from cart
+    removing: fetchers.find(
+      (f) =>
+        (f.state === 'submitting' || f.state === 'loading') &&
+        f.formData?.get('subaction') === 'deleteItem' &&
+        f.formData?.get('lineItemId'),
+    ),
+
+    // Find any fetcher that's adding items to cart
+    adding: fetchers.filter(
+      (f) =>
+        (f.state === 'submitting' || f.state === 'loading') &&
+        (f.formData?.get('action') === 'add-to-cart' ||
+          f.formData?.has('variantId') ||
+          (f.formAction?.includes('/api/cart/line-items') && f.formData?.get('subaction') === 'create')),
+    ),
+  };
+
+  // Get cart data
+  const cart = data?.cart as StoreCart | undefined;
+  const lineItems = cart?.items || [];
+  const itemCount = lineItems.length;
+
+  // Derived states from Remix fetchers
+  const isAddingItem = cartFetchers.adding.length > 0;
+  const isRemovingItemId = cartFetchers.removing?.formData?.get('lineItemId') as string | undefined;
+
+  // Check if we're removing the last item
+  const isLastItemBeingRemoved =
+    isRemovingItemId &&
+    ((itemCount === 1 && isRemovingItemId === lineItems[0]?.id) ||
+      (itemCount === 0 && prevItemCountRef.current === 1 && cartFetchers.removing));
+
+  // Helper to clear any existing timer
+  const clearTimer = useCallback(() => {
+    if (timerRef.current !== null) {
+      window.clearTimeout(timerRef.current);
+      timerRef.current = null;
+    }
+  }, []);
+
+  // Toggle cart drawer with enhanced behavior
+  const toggleCartDrawer = useCallback(
+    (open: boolean) => {
+      // Only update if the state is actually changing
+      if (open !== !!state.cart.open) {
+        actions.toggleCartDrawer(open);
+
+        if (!open) {
+          setIsRemovingLastItem(false);
+        }
+      }
+    },
+    [actions, state.cart.open],
   );
 
-  let cart = data?.cart as StoreCart | undefined;
+  // Effect: Handle cart state transitions
+  useEffect(() => {
+    clearTimer();
+
+    const cartDrawerOpen = !!state.cart.open;
+
+    // Track if we're removing the last item
+    if (isLastItemBeingRemoved && !isRemovingLastItem) {
+      setIsRemovingLastItem(true);
+    }
+
+    // Keep track of previous item count
+    prevItemCountRef.current = itemCount;
+
+    // Handle cart emptying and last item removal
+    if (cartDrawerOpen && isLastItemBeingRemoved) {
+      // If removing last item, close drawer after delay
+      timerRef.current = window.setTimeout(() => {
+        actions.toggleCartDrawer(false);
+      }, 1500);
+    }
+
+    return clearTimer;
+  }, [state.cart.open, itemCount, isLastItemBeingRemoved, isRemovingLastItem, actions, clearTimer]);
+
+  // Reset the removing last item state when the cart is closed or when items are added
+  useEffect(() => {
+    if (!state.cart.open || isAddingItem) {
+      setIsRemovingLastItem(false);
+    }
+  }, [state.cart.open, isAddingItem]);
 
-  let isAddingItem = false;
-  let isRemovingItemId;
-  const cartFetcher = cartFetchers[cartFetchers.length - 1];
-  const removingLineItemFetcher = removingLineItemFetchers[removingLineItemFetchers.length - 1];
+  // Clean up on unmount
+  useEffect(() => {
+    return clearTimer;
+  }, [clearTimer]);
 
-  if (cartFetcher && cartFetcher.formMethod === 'POST' && ['loading', 'submitting'].includes(cartFetcher.state))
-    isAddingItem = true;
+  // Derived UI states
+  const showEmptyCartMessage = !isAddingItem && itemCount === 0;
 
-  if (removingLineItemFetcher && ['loading', 'submitting'].includes(removingLineItemFetcher.state))
-    isRemovingItemId = removingLineItemFetcher.formData?.get('lineItemId');
+  // Ensure cartDrawerOpen is always a boolean
+  const cartDrawerOpen = state.cart.open === true;
 
   return {
     cart,
     isAddingItem,
     isRemovingItemId,
-    cartDrawerOpen: state.cart.open,
-    toggleCartDrawer: actions.toggleCartDrawer,
+    isRemovingLastItem,
+    cartDrawerOpen,
+    toggleCartDrawer,
+    showEmptyCartMessage,
   };
 };
diff --git a/apps/storefront/app/templates/ProductTemplate.tsx b/apps/storefront/app/templates/ProductTemplate.tsx
index d00a6d913..b0a5a4ca9 100644
--- a/apps/storefront/app/templates/ProductTemplate.tsx
+++ b/apps/storefront/app/templates/ProductTemplate.tsx
@@ -17,7 +17,7 @@ import { Share } from '@app/components/share';
 import { Link, useFetcher } from '@remix-run/react';
 import { withYup } from '@remix-validated-form/with-yup';
 import truncate from 'lodash/truncate';
-import { useEffect, useMemo, useRef, useState, type ChangeEvent } from 'react';
+import { useEffect, useMemo, useRef, useState, type ChangeEvent, useCallback } from 'react';
 import * as Yup from 'yup';
 import { ProductOptionSelectorSelect } from '@app/components/product/ProductOptionSelectorSelect';
 import { LineItemActions } from '@app/routes/api.cart.line-items';
@@ -122,7 +122,13 @@ export const ProductTemplate = ({ product, reviewsCount, reviewStats }: ProductT
   const { toggleCartDrawer } = useCart();
   const { region } = useRegion();
   const hasErrors = Object.keys(addToCartFetcher.data?.fieldErrors || {}).length > 0;
-  const isSubmitting = ['submitting', 'loading'].includes(addToCartFetcher.state);
+
+  // Detect form submission as early as possible
+  const isFormSubmitting = addToCartFetcher.formAction?.includes('/api/cart/line-items');
+
+  // Combine both states to detect adding items as early as possible
+  const isAddingToCart = isFormSubmitting || ['submitting', 'loading'].includes(addToCartFetcher.state);
+
   const validator = getAddToCartValidator(product);
 
   const defaultValues: AddToCartFormValues = {
@@ -206,13 +212,42 @@ export const ProductTemplate = ({ product, reviewsCount, reviewStats }: ProductT
   };
 
   useEffect(() => {
-    if (!isSubmitting && !hasErrors) {
-      formRef.current?.reset();
+    if (!isAddingToCart && !hasErrors) {
+      // Only reset the form fields, not the controlled options
+      if (formRef.current) {
+        // Reset the form to clear validation states
+        formRef.current.reset();
+
+        // Re-set the quantity field to 1
+        const quantityInput = formRef.current.querySelector('input[name="quantity"]') as HTMLInputElement;
+        if (quantityInput) {
+          quantityInput.value = '1';
+        }
+
+        // Keep the hidden productId field
+        const productIdInput = formRef.current.querySelector('input[name="productId"]') as HTMLInputElement;
+        if (productIdInput) {
+          productIdInput.value = product.id!;
+        }
+      }
     }
-  }, [isSubmitting, hasErrors]);
+  }, [isAddingToCart, hasErrors, product.id]);
+
+  useEffect(() => {
+    // Initialize controlledOptions with defaultValues.options only on initial load
+    if (Object.keys(controlledOptions).length === 0) {
+      setControlledOptions(defaultValues.options);
+    }
+  }, [defaultValues.options, controlledOptions]);
 
   const soldOut = variantIsSoldOut(selectedVariant) || productSoldOut;
 
+  // Use useCallback for the form submission handler
+  const handleAddToCart = useCallback(() => {
+    // Open cart drawer
+    toggleCartDrawer(true);
+  }, [toggleCartDrawer]);
+
   return (
     <>
       <section className="pb-12 pt-12 xl:pt-24 min-h-screen">
@@ -226,9 +261,7 @@ export const ProductTemplate = ({ product, reviewsCount, reviewStats }: ProductT
           subaction={LineItemActions.CREATE}
           defaultValues={defaultValues}
           validator={validator}
-          onSubmit={() => {
-            toggleCartDrawer(true);
-          }}
+          onSubmit={handleAddToCart}
         >
           <input type="hidden" name="productId" value={product.id} />
 
@@ -325,7 +358,7 @@ export const ProductTemplate = ({ product, reviewsCount, reviewStats }: ProductT
                             <div className="flex-1">
                               {!soldOut ? (
                                 <SubmitButton className="!h-12 w-full whitespace-nowrap !text-base !font-bold">
-                                  {isSubmitting ? 'Adding...' : 'Add to cart'}
+                                  {isAddingToCart ? 'Adding...' : 'Add to cart'}
                                 </SubmitButton>
                               ) : (
                                 <SubmitButton
@@ -391,7 +424,7 @@ export const ProductTemplate = ({ product, reviewsCount, reviewStats }: ProductT
               </GridColumn>
             </Grid>
           </Container>
-        </Form>{' '}
+        </Form>
       </section>
     </>
   );


Reviews:
user: login: copilot-pull-request-reviewer[bot]
body: ## Pull Request Overview

This PR refactors the CartDrawer component and enhances the useCart hook to improve state management and user experience while documenting the design approach in a dedicated design document. Key changes include:
- Modularization of the CartDrawer into distinct subcomponents (Header, Content, Empty, Loading, Items, Footer).
- Enhancement of the useCart hook for handling cart state, loading states, and drawer toggle logic.
- Improvements to the product template for handling form submission and cart updates.

### Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

| File | Description |
| ---- | ----------- |
| apps/storefront/app/components/cart/CartDrawerDesignDoc.md | Design document for the cart drawer system; duplicate section headings detected. |
| apps/storefront/app/hooks/useCart.ts | Enhanced hook combining cart data and drawer state management with improved timer handling. |
| apps/storefront/app/components/cart/CartDrawer.tsx | Refactored component into modular subcomponents, with updated dialog transitions and button logic. |
| apps/storefront/app/templates/ProductTemplate.tsx | Updated form submission handling for adding items to cart; unresolved merge conflict markers present. |


<details>
<summary>Comments suppressed due to low confidence (1)</summary>

**apps/storefront/app/components/cart/CartDrawer.tsx:118**
* [nitpick] The disabled condition for the checkout button contains a redundant check (itemCount === 0 appears twice). Simplify the condition for clarity.
```
disabled={itemCount === 0 || isRemovingLastItem || (!isAddingItem && itemCount === 0)}
```
</details>


state: COMMENTED
author_association: CONTRIBUTOR
submitted_at: 2025-03-14T22:58:46Z
user: login: coderabbitai[bot]
body: **Actionable comments posted: 2**

<details>
<summary>🧹 Nitpick comments (8)</summary><blockquote>

<details>
<summary>apps/storefront/app/components/cart/CartDrawerDesignDoc.md (3)</summary><blockquote>

`30-30`: **Add a comma before "but" for clarity.**

Currently, line 30 reads:  
> 4. Cart is empty but items are being added  

To follow standard English grammar rules and improve readability, add a comma before "but."

```diff
-4. Cart is empty but items are being added
+4. Cart is empty, but items are being added
```

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 LanguageTool</summary>

[uncategorized] ~30-~30: Use a comma before ‘but’ if it connects two independent clauses (unless they are closely connected and short).
Context: .... Cart is being updated 4. Cart is empty but items are being added  ## First Princip...

(COMMA_COMPOUND_SENTENCE_2)

</details>

</details>

---

`60-60`: **Specify a language for the fenced code block.**

Markdown lint rules (MD040) recommend including a language identifier (e.g., `\`\`\`js` or `\`\`\`bash`), which helps with syntax highlighting.

```diff
-```
+```bash
 CartDrawer
 ...
```

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

60-60: Fenced code blocks should have a language specified
null

(MD040, fenced-code-language)

</details>

</details>

---

`75-75`: **Include a language identifier in the fenced code block.**

Similarly to the previous code block, specifying a language here avoids lint warnings and provides syntax highlighting.

```diff
-```
+```bash
 useCart
 ...
```

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

75-75: Fenced code blocks should have a language specified
null

(MD040, fenced-code-language)

</details>

</details>

</blockquote></details>
<details>
<summary>apps/storefront/app/templates/ProductTemplate.tsx (1)</summary><blockquote>

`214-219`: **Avoid creating unused FormData object.**

Inside the effect, the `FormData` instance is never utilized. This code path might be leftover. Consider removing it or using it for form-related logic as intended.  

```diff
        // Create a new FormData from the current form
-       const formData = new FormData(formRef.current);
+       // const formData = new FormData(formRef.current); // Remove if not needed
```

</blockquote></details>
<details>
<summary>apps/storefront/app/components/cart/CartDrawer.tsx (4)</summary><blockquote>

`68-91`: **Comprehensive content component with multiple state handling.**

The CartDrawerContent component handles various UI states well, including empty cart, loading, and populated states. However, the conditional logic could be simplified to make it more maintainable.


Consider refactoring the conditional rendering to make the logic more explicit:

```diff
- {/* Show empty cart message when cart is empty and not loading */}
- {(showEmptyCartMessage || isRemovingLastItem) && <CartDrawerEmpty />}
-
- {/* Show items when there are items in the cart */}
- {items.length > 0 && !isRemovingLastItem && (
-   <CartDrawerItems items={items} isRemovingItemId={isRemovingItemId} currencyCode={currencyCode} />
- )}
-
- {/* Show loading item when adding items but not when removing the last item */}
- {isAddingItem && !isRemovingLastItem && <CartDrawerLoading />}

+ {/* Use a more explicit rendering approach */}
+ {isRemovingLastItem && <CartDrawerEmpty />}
+ {!isRemovingLastItem && (
+   <>
+     {showEmptyCartMessage && <CartDrawerEmpty />}
+     {items.length > 0 && (
+       <CartDrawerItems items={items} isRemovingItemId={isRemovingItemId} currencyCode={currencyCode} />
+     )}
+     {isAddingItem && <CartDrawerLoading />}
+   </>
+ )}
```

This makes the state hierarchy clearer with the primary condition being whether the last item is being removed.

---

`93-137`: **Well-structured footer with appropriate checkout button states.**

The footer component handles price formatting and checkout button states appropriately. However, there's some redundancy in the disabled logic for the checkout button.


The checkout button's disabled condition can be simplified:

```diff
- disabled={itemCount === 0 || isRemovingLastItem || (!isAddingItem && itemCount === 0)}
+ disabled={itemCount === 0 || isRemovingLastItem}
```

The condition `(!isAddingItem && itemCount === 0)` is redundant because it's already covered by `itemCount === 0`.

---

`153-158`: **Smart detection of cart loading state through fetchers.**

This is an excellent approach to track loading states by inspecting fetchers. However, the detection could be more robust.


Consider refining the fetcher detection logic to be more precise:

```diff
const isCartLoading = allFetchers.some(
  (f) =>
    (f.state === 'submitting' || f.state === 'loading') &&
-   (f.formAction?.includes('/api/cart') || f.formData?.get('action') === 'add-to-cart'),
+   (f.formAction?.includes('/api/cart') || 
+    f.formData?.get('action') === 'add-to-cart' ||
+    f.formData?.get('action') === 'update-cart-item' ||
+    f.formData?.get('action') === 'remove-cart-item'),
);
```

This ensures you're capturing all cart-related actions for a more accurate loading state.

---

`56-58`: **Consider enhancing type safety for cart items.**

The `items` prop uses `any[]` type which loses type safety benefits. 


Consider defining a proper interface for cart items:

```typescript
interface CartItem {
  id: string;
  quantity: number;
  variant: {
    title: string;
    prices: Array<{
      amount: number;
      currency_code: string;
    }>;
  };
  // Add other required properties
}

// Then update the props type
items: CartItem[];
```

This will provide better TypeScript support, autocompletion, and catch potential errors at compile time.

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 1ed594db036466f32c097e3fc143e10c00e6b25c and 513595b1f2a49cc4b4e87ef59d40138a541bf30d.

</details>

<details>
<summary>📒 Files selected for processing (4)</summary>

* `apps/storefront/app/components/cart/CartDrawer.tsx` (1 hunks)
* `apps/storefront/app/components/cart/CartDrawerDesignDoc.md` (1 hunks)
* `apps/storefront/app/hooks/useCart.ts` (1 hunks)
* `apps/storefront/app/templates/ProductTemplate.tsx` (6 hunks)

</details>

<details>
<summary>🧰 Additional context used</summary>

<details>
<summary>🪛 LanguageTool</summary>

<details>
<summary>apps/storefront/app/components/cart/CartDrawerDesignDoc.md</summary>

[duplication] ~21-~21: Possible typo: you repeated a word.
Context: ... 3. User removes the last item from the cart 4. Cart becomes empty (with animation)  ### Loa...

(ENGLISH_WORD_REPEAT_RULE)

---

[duplication] ~28-~28: Possible typo: you repeated a word.
Context: ...art 2. Items are being removed from the cart 3. Cart is being updated 4. Cart is empty but i...

(ENGLISH_WORD_REPEAT_RULE)

---

[uncategorized] ~30-~30: Use a comma before ‘but’ if it connects two independent clauses (unless they are closely connected and short).
Context: .... Cart is being updated 4. Cart is empty but items are being added  ## First Princip...

(COMMA_COMPOUND_SENTENCE_2)

</details>

</details>
<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

<details>
<summary>apps/storefront/app/components/cart/CartDrawerDesignDoc.md</summary>

60-60: Fenced code blocks should have a language specified
null

(MD040, fenced-code-language)

---

75-75: Fenced code blocks should have a language specified
null

(MD040, fenced-code-language)

---

150-150: Multiple headings with the same content
null

(MD024, no-duplicate-heading)

</details>

</details>

</details>

<details>
<summary>🔇 Additional comments (15)</summary><blockquote>

<details>
<summary>apps/storefront/app/hooks/useCart.ts (3)</summary>

`7-11`: **Documentation is clear and accurate.**

The added JSDoc block succinctly describes the new approach. Good job combining the cart data management and drawer state logic into one place.

---

`53-58`: **Confirm safe access to lineItems and consider edge cases.**

Accessing `lineItems[0]?.id` should be safe due to optional chaining. However, ensure no other edge cases cause unexpected behavior—for instance if `lineItems` updates concurrently. 

Explain if there's any scenario where `lineItems` might be updated while the removing fetch is still in progress.

---

`99-101`: <details>
<summary>✅ Verification successful</summary>

**Consider potential concurrency issues with setTimeout.**

Closing the drawer after 1.5s might cause unexpected behavior if users quickly re-open the drawer or add more items. Confirm that resetting the timer (via `clearTimer()`) is sufficient to handle such edge cases.

---

🏁 Script executed:

```shell
#!/bin/bash
# Searching for any references to toggleCartDrawer or cart timers in the codebase 
# to confirm no concurrency issues remain unhandled.
rg -A 6 'toggleCartDrawer|cartFetchers|setTimeout' 
```

Length of output: 11735

---



</details>

**Concurrency concern resolved: Timer reset via clearTimer works as intended.**

After reviewing the code in `apps/storefront/app/hooks/useCart.ts`, the use of the `clearTimer` helper properly cancels any pending timeout when a new state change occurs. This prevents overlapping timers even if a user quickly reopens the cart or performs rapid actions. No additional concurrency issues were identified.

</details>
<details>
<summary>apps/storefront/app/components/cart/CartDrawer.tsx (12)</summary>

`1-1`: **Improved imports with necessary hooks for state management.**

Good addition of React hooks like `useState` and `useEffect` to manage the component's local state and synchronize it with external state. The use of `useCallback` for handlers is also a good practice for optimization.

---

`13-28`: **Well-structured CartDrawerHeader component.**

This component is cleanly separated with clear responsibilities. Good job implementing:
1. Conditional rendering for item count display
2. Proper accessibility with aria-label for the close button
3. Appropriate TypeScript typing with FC and props interface

This follows the single responsibility principle well.

---

`30-31`: **Simple and effective empty cart component.**

This component is appropriately simple for its purpose, with clear messaging and proper text styling.

---

`33-53`: **Excellent loading state implementation with skeleton UI.**

The skeleton loading UI is a great UX improvement that provides visual feedback during loading states. The use of `animate-pulse` and appropriate placeholders that match the actual content structure creates a smooth experience for users.

---

`55-66`: **Clean implementation of cart items list.**

Good job extracting this logic into its own component. The component properly maps over items and passes the necessary props to individual cart items, including the `isRemoving` state.

---

`141-149`: **Comprehensive cart state management.**

Good use of the custom `useCart` hook to manage cart state. The inclusion of additional states like `isRemovingLastItem` and `showEmptyCartMessage` improves the user experience by handling edge cases.

---

`160-166`: **Good synchronization of local and global cart drawer states.**

Using local state with `useState` and synchronizing it with the global state via `useEffect` is a good pattern. This allows for more controlled transitions and better UX.

---

`171-174`: **Optimized event handler with useCallback.**

Good use of `useCallback` to memoize the handler function, preventing unnecessary re-renders. This is especially important for functions passed down to child components.

---

`176-178`: **Clean implementation of drawer close handler.**

The close handler is properly implemented with `useCallback` and uses the `toggleCartDrawer` function from the hook.

---

`181-187`: **Accessible dialog implementation with proper transitions.**

Good use of Headless UI's Dialog components with proper ARIA attributes. The backdrop transition effect adds a nice touch to the UX.

---

`191-195`: **Smooth panel transition with transform animations.**

The sliding panel animation using transform and transition classes creates a smooth user experience. Well done using the data-[closed] attribute for transition states.

---

`197-220`: **Clean composition of modular components.**

The main CartDrawer component effectively composes all the modular components with appropriate props. This demonstrates good component architecture and separation of concerns.

</details>

</blockquote></details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-03-14T23:01:34Z
user: login: coderabbitai[bot]
body: **Actionable comments posted: 0**

<details>
<summary>🧹 Nitpick comments (1)</summary><blockquote>

<details>
<summary>apps/storefront/app/templates/ProductTemplate.tsx (1)</summary><blockquote>

`219-219`: **Unused FormData creation.**

The `formData` variable is created but never used in this effect. Consider removing it if it's not needed.

```diff
- // Create a new FormData from the current form
- const formData = new FormData(formRef.current);
```

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 513595b1f2a49cc4b4e87ef59d40138a541bf30d and b1562e19cff5c3536adbb5a31499a326d79841c2.

</details>

<details>
<summary>📒 Files selected for processing (1)</summary>

* `apps/storefront/app/templates/ProductTemplate.tsx` (6 hunks)

</details>

<details>
<summary>🔇 Additional comments (7)</summary><blockquote>

<details>
<summary>apps/storefront/app/templates/ProductTemplate.tsx (7)</summary>

`20-20`: **Appropriate import addition.**

Adding `useCallback` to the imports supports the refactored form submission handler.

---

`125-130`: **Improved form submission detection.**

Great improvement to detect form submission earlier and more accurately. The combined state variables provide better feedback about the cart's current state.

1. `isFormSubmitting` detects form submission by checking the form action
2. `isAddingToCart` combines this with existing loading states for comprehensive tracking

This approach improves the user experience by providing feedback earlier in the process.

---

`214-237`: **Enhanced form reset logic.**

The updated form reset logic is much more robust, preserving controlled options while clearing form state. This solves the common UX issue where forms completely reset, losing user selections.

The approach of selectively resetting specific form fields while preserving others is excellent. This implementation is particularly careful about:
1. Clearing validation states
2. Resetting the quantity to 1
3. Preserving the product ID

---

`239-244`: **Good initialization approach for controlled options.**

The new effect ensures controlled options are initialized properly only when needed, preventing unnecessary re-renders or option resets.

---

`248-252`: **Well-structured form submission handler.**

Extracting the cart drawer toggle logic into a separate, memoized function using `useCallback` improves both code organization and performance.

---

`267-267`: **Cleaner form submission approach.**

Replacing the inline function with the memoized `handleAddToCart` function improves readability and prevents unnecessary re-renders.

---

`364-364`: **Improved user feedback on button.**

Using the new `isAddingToCart` state for the button text provides more accurate feedback to users about the current state of their action.

</details>

</blockquote></details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-03-14T23:03:02Z
user: login: coderabbitai[bot]
body: **Actionable comments posted: 0**

<details>
<summary>♻️ Duplicate comments (1)</summary><blockquote>

<details>
<summary>apps/storefront/app/components/cart/CartDrawerDesignDoc.md (1)</summary><blockquote>

`142-156`: _🛠️ Refactor suggestion_

**Consolidate Redundant Conclusion Sections**  
There are two concluding sections (lines 142–149 and 150–156) that summarize the benefits of the approach with overlapping content. Merging these into a single, cohesive conclusion would streamline the document and reduce redundancy.

</blockquote></details>

</blockquote></details>

<details>
<summary>🧹 Nitpick comments (4)</summary><blockquote>

<details>
<summary>apps/storefront/app/components/cart/CartDrawerDesignDoc.md (4)</summary><blockquote>

`16-23`: **Clarify Closing Behaviors Conditions**  
The “Closing Behaviors” list is well detailed; however, conditions #3 ("User removes the last item from the cart") and #4 ("Cart becomes empty (with animation)") seem conceptually similar. Consider consolidating them or clarifying the distinction to avoid potential confusion.

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 LanguageTool</summary>

[duplication] ~21-~21: Possible typo: you repeated a word.
Context: ... 3. User removes the last item from the cart 4. Cart becomes empty (with animation)  ### Loa...

(ENGLISH_WORD_REPEAT_RULE)

</details>

</details>

---

`24-31`: **Punctuation Improvement in Loading States**  
In the “Loading States” section, consider adding a comma before “but” in the final item to improve readability. For example:  
```diff
-4. Cart is empty but items are being added
+4. Cart is empty, but items are being added
```

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 LanguageTool</summary>

[duplication] ~28-~28: Possible typo: you repeated a word.
Context: ...art 2. Items are being removed from the cart 3. Cart is being updated 4. Cart is empty but i...

(ENGLISH_WORD_REPEAT_RULE)

---

[uncategorized] ~30-~30: Use a comma before ‘but’ if it connects two independent clauses (unless they are closely connected and short).
Context: .... Cart is being updated 4. Cart is empty but items are being added  ## First Princip...

(COMMA_COMPOUND_SENTENCE_2)

</details>

</details>

---

`56-71`: **Specify Fenced Code Block Language for Components Hierarchy**  
The components hierarchy is clearly presented. To satisfy markdownlint guidelines and improve clarity, consider specifying a language (e.g., `text`) in the fenced code block. For example:  
```diff
-```
+```text
```

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

60-60: Fenced code blocks should have a language specified
null

(MD040, fenced-code-language)

</details>

</details>

---

`72-81`: **Fenced Code Block Language for Hooks Organization**  
Similarly, the diagram for hook organization would benefit from a language specifier. Using `text` (or another appropriate identifier) will help adhere to markdown formatting best practices.  
```diff
-```
+```text
```

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

75-75: Fenced code blocks should have a language specified
null

(MD040, fenced-code-language)

</details>

</details>

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between b1562e19cff5c3536adbb5a31499a326d79841c2 and 9197b0e9e0ab82425e07e39037547c5eaba14ec2.

</details>

<details>
<summary>📒 Files selected for processing (1)</summary>

* `apps/storefront/app/components/cart/CartDrawerDesignDoc.md` (1 hunks)

</details>

<details>
<summary>🧰 Additional context used</summary>

<details>
<summary>🪛 LanguageTool</summary>

<details>
<summary>apps/storefront/app/components/cart/CartDrawerDesignDoc.md</summary>

[duplication] ~21-~21: Possible typo: you repeated a word.
Context: ... 3. User removes the last item from the cart 4. Cart becomes empty (with animation)  ### Loa...

(ENGLISH_WORD_REPEAT_RULE)

---

[duplication] ~28-~28: Possible typo: you repeated a word.
Context: ...art 2. Items are being removed from the cart 3. Cart is being updated 4. Cart is empty but i...

(ENGLISH_WORD_REPEAT_RULE)

---

[uncategorized] ~30-~30: Use a comma before ‘but’ if it connects two independent clauses (unless they are closely connected and short).
Context: .... Cart is being updated 4. Cart is empty but items are being added  ## First Princip...

(COMMA_COMPOUND_SENTENCE_2)

</details>

</details>
<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

<details>
<summary>apps/storefront/app/components/cart/CartDrawerDesignDoc.md</summary>

60-60: Fenced code blocks should have a language specified
null

(MD040, fenced-code-language)

---

75-75: Fenced code blocks should have a language specified
null

(MD040, fenced-code-language)

</details>

</details>

</details>

<details>
<summary>🔇 Additional comments (14)</summary><blockquote>

<details>
<summary>apps/storefront/app/components/cart/CartDrawerDesignDoc.md (14)</summary>

`1-4`: **Excellent Introduction and Context**  
The introduction clearly establishes the purpose and scope of the cart drawer system design document. It provides a solid foundation for the sections that follow.

---

`5-8`: **Well-Defined Core Requirements**  
The “Core Requirements” section succinctly outlines the essential functionality of the cart drawer. This clarity will help guide implementation.

---

`9-15`: **Clear Opening Behaviors**  
The “Opening Behaviors” section enumerates the conditions for opening the cart drawer effectively. Please ensure these behaviors continue to align with the enhanced logic in the `useCart` hook implementation.

---

`32-42`: **Good Adoption of First Principles**  
The “First Principles Design” section is structured well and emphasizes the importance of focused responsibility, UI separation, and independent drawer state management.

---

`43-48`: **Clear Principle on Simplicity**  
The “Simplicity Over Complexity” segment reinforces best practices by advocating for fewer, more focused hooks and minimizing prop drilling.

---

`49-55`: **Well-Outlined State Transition Guidelines**  
The guidelines for predictable state transitions and explicit state variable management are articulated clearly, supporting maintainable implementation.

---

`82-92`: **Concise Implementation Approach for useCart Hook**  
The description of the enhanced `useCart` hook is comprehensive and accurately outlines responsibilities such as API integration, state management, and automatic drawer closing.

---

`93-99`: **Clear Optional Animation Hook Description**  
The optional animation-focused hook is well described, emphasizing its role in managing drawer animations and cleanup of timers.

---

`100-107`: **Well-Defined Cart Drawer Component**  
The responsibilities of the main CartDrawer component are clearly articulated, including how it integrates hooks, handles navigation, and renders different cart states.

---

`108-115`: **Comprehensive Benefits Section**  
The “Benefits of This Approach” section starts off strong by detailing reduced complexity and clearer data flows, reinforcing the rationale behind the design choices.

---

`116-121`: **Solid State Management Benefits**  
The benefits related to more cohesive state management are well laid out, and they effectively highlight improvements in synchronizing state and reducing re-renders.

---

`122-127`: **Clear Maintainability Advantages**  
This section effectively underlines the maintainability and debugging improvements of the proposed design, making it easier for future developers to work with the system.

---

`128-134`: **Good Identification of Anti-Patterns**  
Listing potential anti-patterns such as overly complex conditions and timer proliferation is very useful. This proactive guidance can help avoid common pitfalls during future development.

---

`135-141`: **Future Improvements Insights**  
The “Future Improvements” section provides actionable ideas like exploring state machines and animation libraries. These suggestions offer a clear roadmap for further enhancing the system.

</details>

</blockquote></details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-03-14T23:05:17Z
user: login: coderabbitai[bot]
body: **Actionable comments posted: 0**

<details>
<summary>🧹 Nitpick comments (1)</summary><blockquote>

<details>
<summary>apps/storefront/app/components/cart/CartDrawer.tsx (1)</summary><blockquote>

`93-137`: **Comprehensive footer with proper button states.**

The CartDrawerFooter component has good handling of the checkout button's disabled state based on cart conditions. The subtotal display and continue shopping link are well-implemented.


Consider adding a data attribute to the checkout button that indicates why it's disabled (e.g., data-disabled-reason="empty-cart") to help with analytics and potentially show tooltips explaining why the button is disabled.

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 9197b0e9e0ab82425e07e39037547c5eaba14ec2 and d80751cded6bc2e8cd5f87e93c059cae822e03ce.

</details>

<details>
<summary>📒 Files selected for processing (2)</summary>

* `apps/storefront/app/components/cart/CartDrawer.tsx` (1 hunks)
* `apps/storefront/app/templates/ProductTemplate.tsx` (6 hunks)

</details>

<details>
<summary>🚧 Files skipped from review as they are similar to previous changes (1)</summary>

* apps/storefront/app/templates/ProductTemplate.tsx

</details>

<details>
<summary>🔇 Additional comments (11)</summary><blockquote>

<details>
<summary>apps/storefront/app/components/cart/CartDrawer.tsx (11)</summary>

`1-12`: **Improved imports organization with better React hooks usage.**

The refactored imports now include additional React hooks (useCallback, useState, useEffect) that improve component performance and state management. The inclusion of useFetchers from Remix is a good addition for tracking loading states throughout the application.

---

`13-28`: **Well-structured header component with proper accessibility.**

The CartDrawerHeader component is well-designed with proper semantic elements (DialogTitle) and aria-label for the close button. The conditional rendering of item count provides a good user experience.

---

`30-32`: **Simple and clear empty cart message.**

The CartDrawerEmpty component provides a clean, focused UI for the empty cart state.

---

`33-53`: **Excellent loading state with skeleton UI.**

The CartDrawerLoading component uses Tailwind's animate-pulse for a visually appealing loading state. The skeleton UI closely mirrors the actual cart item layout, which reduces layout shift when content loads.

---

`55-66`: **Clean implementation of cart items list.**

The CartDrawerItems component effectively maps through the items array and renders each item with the appropriate loading state.

---

`68-91`: **Well-orchestrated content component with conditional rendering.**

The CartDrawerContent component elegantly handles different cart states with clear conditional logic. It shows the empty state, loading state, or items as appropriate based on the cart's status.


One suggestion for future enhancement would be to add a transition between these different states for an even smoother user experience.

---

`139-160`: **Improved state management with effective loading detection.**

The main CartDrawer component now uses a comprehensive approach to detect loading states by checking Remix fetchers. The implementation with `allFetchers.some()` is efficient and covers both direct cart API calls and add-to-cart form submissions.

---

`161-167`: **Good synchronization between local state and prop.**

The component properly initializes local state from props and keeps it in sync with the useEffect hook. This pattern allows for better control of the dialog's open state while still respecting external state changes.

---

`171-174`: **Optimized event handlers with useCallback.**

Both handleCheckoutClick and handleClose are implemented with useCallback, which is a good practice for performance optimization as it prevents unnecessary re-renders, especially for event handlers passed to child components.



Also applies to: 176-179

---

`181-226`: **Improved dialog implementation with transitions.**

The Dialog component now uses proper transitions for both the backdrop and panel, creating a more polished user experience. The use of DialogBackdrop and DialogPanel components from Headless UI provides better semantics and accessibility.


The fixed positioning and overflow handling ensure the drawer behaves correctly on mobile devices. The transform and translate properties create a smooth sliding animation.

---

`198-220`: **Well-composed component structure with clear responsibilities.**

The main component effectively composes all the smaller components, passing the appropriate props to each. This modular approach makes the code more maintainable and testable.


The clear separation of concerns between header, content, and footer creates a logical structure that will be easier to update in the future.

</details>

</blockquote></details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-03-14T23:11:06Z

Review comments:
diff_hunk: @@ -0,0 +1,163 @@
+# Cart Drawer System Design Document
+
+This document outlines the requirements, behaviors, and architecture for the cart drawer system in our e-commerce application. It serves as both documentation and a guide for implementing or refactoring the cart drawer functionality.
+
+## Core Requirements
+
+The cart drawer is a fundamental component of the e-commerce user experience, providing immediate feedback when users interact with the shopping cart.
+
+### Opening Behaviors
+
+The cart drawer should open when:
+1. User explicitly opens it by clicking a cart icon
+2. User adds an item to the cart
+3. User modifies an item in the cart
+
+### Closing Behaviors
+
+The cart drawer should close when:
+1. User explicitly closes it by clicking the close button or backdrop
+2. User navigates to checkout
+3. User removes the last item from the cart
+4. Cart becomes empty (with animation)
+
+### Loading States
+
+Loading states should be shown when:
+1. Items are being added to the cart
+2. Items are being removed from the cart
+3. Cart is being updated
+4. Cart is empty but items are being added
+
+## First Principles Design
+
+To keep our implementation clean, maintainable, and predictable, we should follow these principles:
+
+### 1. Focused Responsibility
+
+Group related functionality together while keeping distinct concerns separate:
+- **Cart Data & Loading**: Keep cart data and its loading states together
+- **UI & Animations**: Separate presentation from business logic
+- **Drawer State**: Manage open/closed state independently
+
+### 2. Simplicity Over Complexity
+
+- Prefer fewer hooks with clear responsibilities over many specialized hooks
+- Group closely related state and behaviors together
+- Minimize prop drilling and state synchronization
+
+### 3. Predictable State Transitions
+
+Ensure state transitions are predictable and well-defined:
+- Define clear conditions for state changes
+- Use explicit, descriptive state variables
+- Avoid complex nested conditions
+
+## Simplified Implementation Architecture
+
+### Components Hierarchy
+
+```
+CartDrawer
+├── CartDrawerHeader
+├── CartDrawerContent
+│   ├── CartDrawerEmpty
+│   ├── CartDrawerLoading
+│   └── CartDrawerItems
+│       └── CartDrawerItem
+└── CartDrawerFooter
+    ├── CartDrawerSubtotal
+    └── CartDrawerActions
+```
+
+### Hooks Organization (Simplified)
+
+```
+useCart
+├── Cart data and operations
+├── Cart loading states
+└── Cart drawer toggle operations
+```
+
+## Implementation Approach
+
+### 1. Enhanced useCart Hook
+
+A combined hook for cart data, loading states, and drawer state management that handles:
+- Cart data from API/store
+- Drawer state management
+- Loading state management for adding/removing items
+- Automatic drawer closing when cart becomes empty
+- Tracking cart-related operations
+
+### 2. Animation-focused Hook (Optional)
+
+A dedicated hook for managing animations that handles:
+- Animation timing and state
+- Drawer opening/closing animations
+- Cleanup of animation timers
+
+### 3. Simplified Cart Drawer Component
+
+The main component that:
+- Uses the cart and animation hooks
+- Handles navigation to checkout
+- Renders appropriate cart states (empty, loading, items)
+- Manages transitions and dialogs
+
+## Benefits of This Approach
+
+### 1. Reduced Complexity
+
+- **Fewer Hooks**: Less coordination between multiple hooks reduces complexity
+- **Clear Data Flow**: State and its derived values are managed together
+- **Simplified API**: Fewer props and callbacks between components
+
+### 2. Better State Management
+
+- **Cohesive State**: Related state variables are managed together
+- **Reduced Synchronization**: Less need to keep separate hooks in sync
+- **Clearer Intent**: Functions and state are organized by domain
+
+### 3. Maintainability
+
+- **Easier Debugging**: State transitions are easier to track
+- **Simpler Component Logic**: Components focus on rendering, not state management
+- **Consolidated Logic**: Cart-related behaviors are in one place
+
+## Anti-Patterns to Avoid
+
+1. **Overly Complex Conditions**: Keep state transition logic simple and explicit
+2. **Timer Proliferation**: Manage timeouts carefully and clean them up properly
+3. **Deeply Nested Components**: Keep the component hierarchy flat when possible
+4. **Repeated Animation Logic**: Consolidate animation code in one place
+
+## Future Improvements
+
+- **State Machines**: Consider XState for complex state transitions
+- **Component Composition**: Use composition over configuration
+- **Memoization**: Optimize renders with useMemo and useCallback
+- **Animation Libraries**: Consider Framer Motion for complex animations
+
+---
+
+By adopting this simplified approach, we create a cart drawer system that is:
+- **Simpler**: Fewer hooks with clearer responsibilities
+- **More Maintainable**: Easier to understand and modify
+- **More Predictable**: Clearer state transitions
+- **More Performant**: Fewer re-renders and better state management
+
+## Future Improvements
+
+- **Optimistic UI Updates**: Show changes immediately before API confirms them.
+- **Persistent Cart State**: Save cart state to localStorage for persistence across sessions.
+- **Animation Coordination**: Ensure animations complete before state changes finalize.
+- **Accessibility Improvements**: Ensure keyboard navigation and screen reader compatibility.
+
path: apps/storefront/app/components/cart/CartDrawerDesignDoc.md
user: login: Copilot
body: Duplicate 'Future Improvements' section detected. Consider merging the two sections into one to reduce redundancy.
```suggestion

```
created_at: 2025-03-14T22:58:45Z
author_association: CONTRIBUTOR
diff_hunk: @@ -206,13 +212,48 @@ export const ProductTemplate = ({ product, reviewsCount, reviewStats }: ProductT
   };
 
   useEffect(() => {
-    if (!isSubmitting && !hasErrors) {
-      formRef.current?.reset();
+    if (!isAddingToCart && !hasErrors) {
+      // Only reset the form fields, not the controlled options
+      if (formRef.current) {
+        // Create a new FormData from the current form
+        const formData = new FormData(formRef.current);
+
+        // Reset the form to clear validation states
+        formRef.current.reset();
+
+        // Re-set the quantity field to 1
+        const quantityInput = formRef.current.querySelector('input[name="quantity"]') as HTMLInputElement;
+        if (quantityInput) {
+          quantityInput.value = '1';
+        }
+
+        // Keep the hidden productId field
+        const productIdInput = formRef.current.querySelector('input[name="productId"]') as HTMLInputElement;
+        if (productIdInput) {
+          productIdInput.value = product.id!;
+        }
+      }
     }
-  }, [isSubmitting, hasErrors]);
+  }, [isAddingToCart, hasErrors, product.id]);
 
+<<<<<<< Updated upstream
+=======
path: apps/storefront/app/templates/ProductTemplate.tsx
user: login: Copilot
body: Unresolved merge conflict markers detected. Please resolve the conflicts to ensure the file is free of extraneous conflict markers.
```suggestion
  useEffect(() => {
    if (!isAddingToCart && !hasErrors) {
      // Only reset the form fields, not the controlled options
      if (formRef.current) {
        // Create a new FormData from the current form
        const formData = new FormData(formRef.current);

        // Reset the form to clear validation states
        formRef.current.reset();

        // Re-set the quantity field to 1
        const quantityInput = formRef.current.querySelector('input[name="quantity"]') as HTMLInputElement;
        if (quantityInput) {
          quantityInput.value = '1';
        }

        // Keep the hidden productId field
        const productIdInput = formRef.current.querySelector('input[name="productId"]') as HTMLInputElement;
        if (productIdInput) {
          productIdInput.value = product.id!;
        }
      }
    }
  }, [isAddingToCart, hasErrors, product.id]);
```
created_at: 2025-03-14T22:58:45Z
author_association: CONTRIBUTOR
diff_hunk: @@ -0,0 +1,163 @@
+# Cart Drawer System Design Document
+
+This document outlines the requirements, behaviors, and architecture for the cart drawer system in our e-commerce application. It serves as both documentation and a guide for implementing or refactoring the cart drawer functionality.
+
+## Core Requirements
+
+The cart drawer is a fundamental component of the e-commerce user experience, providing immediate feedback when users interact with the shopping cart.
+
+### Opening Behaviors
+
+The cart drawer should open when:
+1. User explicitly opens it by clicking a cart icon
+2. User adds an item to the cart
+3. User modifies an item in the cart
+
+### Closing Behaviors
+
+The cart drawer should close when:
+1. User explicitly closes it by clicking the close button or backdrop
+2. User navigates to checkout
+3. User removes the last item from the cart
+4. Cart becomes empty (with animation)
+
+### Loading States
+
+Loading states should be shown when:
+1. Items are being added to the cart
+2. Items are being removed from the cart
+3. Cart is being updated
+4. Cart is empty but items are being added
+
+## First Principles Design
+
+To keep our implementation clean, maintainable, and predictable, we should follow these principles:
+
+### 1. Focused Responsibility
+
+Group related functionality together while keeping distinct concerns separate:
+- **Cart Data & Loading**: Keep cart data and its loading states together
+- **UI & Animations**: Separate presentation from business logic
+- **Drawer State**: Manage open/closed state independently
+
+### 2. Simplicity Over Complexity
+
+- Prefer fewer hooks with clear responsibilities over many specialized hooks
+- Group closely related state and behaviors together
+- Minimize prop drilling and state synchronization
+
+### 3. Predictable State Transitions
+
+Ensure state transitions are predictable and well-defined:
+- Define clear conditions for state changes
+- Use explicit, descriptive state variables
+- Avoid complex nested conditions
+
+## Simplified Implementation Architecture
+
+### Components Hierarchy
+
+```
+CartDrawer
+├── CartDrawerHeader
+├── CartDrawerContent
+│   ├── CartDrawerEmpty
+│   ├── CartDrawerLoading
+│   └── CartDrawerItems
+│       └── CartDrawerItem
+└── CartDrawerFooter
+    ├── CartDrawerSubtotal
+    └── CartDrawerActions
+```
+
+### Hooks Organization (Simplified)
+
+```
+useCart
+├── Cart data and operations
+├── Cart loading states
+└── Cart drawer toggle operations
+```
+
+## Implementation Approach
+
+### 1. Enhanced useCart Hook
+
+A combined hook for cart data, loading states, and drawer state management that handles:
+- Cart data from API/store
+- Drawer state management
+- Loading state management for adding/removing items
+- Automatic drawer closing when cart becomes empty
+- Tracking cart-related operations
+
+### 2. Animation-focused Hook (Optional)
+
+A dedicated hook for managing animations that handles:
+- Animation timing and state
+- Drawer opening/closing animations
+- Cleanup of animation timers
+
+### 3. Simplified Cart Drawer Component
+
+The main component that:
+- Uses the cart and animation hooks
+- Handles navigation to checkout
+- Renders appropriate cart states (empty, loading, items)
+- Manages transitions and dialogs
+
+## Benefits of This Approach
+
+### 1. Reduced Complexity
+
+- **Fewer Hooks**: Less coordination between multiple hooks reduces complexity
+- **Clear Data Flow**: State and its derived values are managed together
+- **Simplified API**: Fewer props and callbacks between components
+
+### 2. Better State Management
+
+- **Cohesive State**: Related state variables are managed together
+- **Reduced Synchronization**: Less need to keep separate hooks in sync
+- **Clearer Intent**: Functions and state are organized by domain
+
+### 3. Maintainability
+
+- **Easier Debugging**: State transitions are easier to track
+- **Simpler Component Logic**: Components focus on rendering, not state management
+- **Consolidated Logic**: Cart-related behaviors are in one place
+
+## Anti-Patterns to Avoid
+
+1. **Overly Complex Conditions**: Keep state transition logic simple and explicit
+2. **Timer Proliferation**: Manage timeouts carefully and clean them up properly
+3. **Deeply Nested Components**: Keep the component hierarchy flat when possible
+4. **Repeated Animation Logic**: Consolidate animation code in one place
+
+## Future Improvements
+
+- **State Machines**: Consider XState for complex state transitions
+- **Component Composition**: Use composition over configuration
+- **Memoization**: Optimize renders with useMemo and useCallback
+- **Animation Libraries**: Consider Framer Motion for complex animations
+
+---
+
+By adopting this simplified approach, we create a cart drawer system that is:
+- **Simpler**: Fewer hooks with clearer responsibilities
+- **More Maintainable**: Easier to understand and modify
+- **More Predictable**: Clearer state transitions
+- **More Performant**: Fewer re-renders and better state management
+
+## Future Improvements
path: apps/storefront/app/components/cart/CartDrawerDesignDoc.md
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**Remove duplicate heading "## Future Improvements" to avoid confusion.**

You have two separate "## Future Improvements" sections at lines 135 and 150; consider consolidating them or renaming one to maintain a clear structure.

```diff
-## Future Improvements
 ...
 ## Future Improvements
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

`````suggestion
## Future Improvements

- **State Machines**: Consider XState for complex state transitions
- **Component Composition**: Use composition over configuration
- **Memoization**: Optimize renders with useMemo and useCallback
- **Animation Libraries**: Consider Framer Motion for complex animations

---

By adopting this simplified approach, we create a cart drawer system that is:
- **Simpler**: Fewer hooks with clearer responsibilities
- **More Maintainable**: Easier to understand and modify
- **More Predictable**: Clearer state transitions
- **More Performant**: Fewer re-renders and better state management
`````

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

150-150: Multiple headings with the same content
null

(MD024, no-duplicate-heading)

</details>

</details>

<!-- This is an auto-generated comment by CodeRabbit -->

✅ Addressed in commit 9197b0e
created_at: 2025-03-14T23:01:33Z
author_association: NONE
diff_hunk: @@ -206,13 +212,48 @@ export const ProductTemplate = ({ product, reviewsCount, reviewStats }: ProductT
   };
 
   useEffect(() => {
-    if (!isSubmitting && !hasErrors) {
-      formRef.current?.reset();
+    if (!isAddingToCart && !hasErrors) {
+      // Only reset the form fields, not the controlled options
+      if (formRef.current) {
+        // Create a new FormData from the current form
+        const formData = new FormData(formRef.current);
+
+        // Reset the form to clear validation states
+        formRef.current.reset();
+
+        // Re-set the quantity field to 1
+        const quantityInput = formRef.current.querySelector('input[name="quantity"]') as HTMLInputElement;
+        if (quantityInput) {
+          quantityInput.value = '1';
+        }
+
+        // Keep the hidden productId field
+        const productIdInput = formRef.current.querySelector('input[name="productId"]') as HTMLInputElement;
+        if (productIdInput) {
+          productIdInput.value = product.id!;
+        }
+      }
     }
-  }, [isSubmitting, hasErrors]);
+  }, [isAddingToCart, hasErrors, product.id]);
 
+<<<<<<< Updated upstream
+=======
+  useEffect(() => {
+    // Initialize controlledOptions with defaultValues.options only on initial load
+    if (Object.keys(controlledOptions).length === 0) {
+      setControlledOptions(defaultValues.options);
+    }
+  }, [defaultValues.options, controlledOptions]);
+
+>>>>>>> Stashed changes
path: apps/storefront/app/templates/ProductTemplate.tsx
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Remove leftover merge conflict markers.**

Git conflict markers (`<<<<<<<`, `=======`, `>>>>>>>`) are present, indicating an unresolved merge. Finalize the resolution and remove these lines.

```diff
 ...
 ...
```


> Committable suggestion skipped: line range outside the PR's diff.

<!-- This is an auto-generated comment by CodeRabbit -->

✅ Addressed in commit b1562e1
created_at: 2025-03-14T23:01:33Z
author_association: NONE

PR comments:
user: login: coderabbitai[bot]
created_at: 2025-03-14T22:57:52Z
body: <!-- This is an auto-generated comment: summarize by coderabbit.ai -->
<!-- walkthrough_start -->

## Walkthrough

The pull request refactors the storefront’s cart functionality by modularizing the cart drawer into several dedicated sub-components and enhancing state management. In the cart drawer component, UI parts are separated into header, empty, loading, items, content, and footer sections. A complementary design document outlines the new architecture and behavior. The hook managing cart state has been enhanced with additional tracking for removal events and timers. Additionally, the product template’s form submission logic has been refactored to better detect adding-to-cart actions and preserve controlled options.

## Changes

| File(s) | Change Summary |
|---------|----------------|
| `apps/storefront/app/components/cart/CartDrawer.tsx`<br>`apps/storefront/app/components/cart/CartDrawerDesignDoc.md` | Modularized the cart drawer UI by splitting it into multiple components (Header, Empty, Loading, Items, Content, Footer) with improved state management (useState, useEffect, useCallback). A new design document specifies the architecture, user interactions, and state transitions for the cart drawer system. |
| `apps/storefront/app/hooks/useCart.ts` | Enhanced the useCart hook with additional state variables (`isRemovingLastItem`, `timerRef`, `prevItemCountRef`), restructured fetcher logic by categorizing into `adding` and `removing`, and introduced new effects for managing cart state transitions and cleaning up timers. |
| `apps/storefront/app/templates/ProductTemplate.tsx` | Refactored form submission logic by adding new state variables (`isFormSubmitting`, `isAddingToCart`), using a useCallback handler (`handleAddToCart`) to open the cart drawer, and updating the form reset process to preserve controlled options while setting default values. |

## Sequence Diagram(s)

```mermaid
sequenceDiagram
  participant User
  participant PT as ProductTemplate
  participant CD as CartDrawer
  participant UC as useCart

  User->>PT: Submits add-to-cart form
  PT->>PT: Execute handleAddToCart (via useCallback)
  PT->>CD: Trigger open drawer (toggleCartDrawer(true))
  CD->>UC: Synchronize current cart state (items, loading, removal status)
  UC->>CD: Return updated cart state
  CD->>User: Render updated cart UI (header, items, footer, checkout button)
```

<!-- walkthrough_end -->
<!-- internal state start -->


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 -->

<!-- internal state end -->
<!-- finishing_touch_checkbox_start -->

<details>
<summary>✨ Finishing Touches</summary>

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</details>

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author_association: NONE
user: login: medusajs[bot]
created_at: 2025-03-14T22:57:54Z
body: | Name | Deployment Status | Preview Link | Timestamp |
|------|-------------------|--------------|-----------|
| **Medusa Starter** | 🟠 Deploying | [Preview](https://dilapidated-marble-purchase.medusajs.app) <!-- handle:m08c9dbf0abbc913382 --> | Fri, 14 Mar 2025 23:11:26 GMT |
author_association: NONE