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import {
createContext,
useCallback,
useContext,
useEffect,
useMemo,
useReducer,
type ReactNode,
} from "react";
import { getProductBySlug } from "@/data/products";
import {
cartReducer,
getCartItemCount,
getCartSubtotal,
initialCartState,
} from "@/lib/cart/cart-reducer";
import type { CartLineItem, CartState } from "@/lib/cart/cart-types";
import type { Product } from "@/types/product";
const storageKey = "headless-commerce-cart";
/**
* Public cart context contract exposed through `useCart`.
*/
export interface CartContextValue extends CartState {
readonly addItem: (product: Product, quantity?: number) => void;
readonly clearCart: () => void;
readonly closeCart: () => void;
readonly decrementItem: (slug: string) => void;
readonly incrementItem: (slug: string) => void;
readonly itemCount: number;
readonly openCart: () => void;
readonly removeItem: (slug: string) => void;
readonly subtotalCents: number;
}
/**
* Cart provider options used by the application shell and component tests.
*/
export interface CartProviderProps {
readonly children: ReactNode;
readonly initialState?: CartState;
readonly persist?: boolean;
}
const CartContext = createContext<CartContextValue | null>(null);
function isRecord(value: unknown): value is Record<string, unknown> {
return typeof value === "object" && value !== null;
}
function parseStoredItems(value: string | null): CartLineItem[] {
if (!value) {
return [];
}
try {
const parsed: unknown = JSON.parse(value);
if (!Array.isArray(parsed)) {
return [];
}
const items: CartLineItem[] = [];
for (const item of parsed) {
if (
!isRecord(item) ||
!isRecord(item.product) ||
typeof item.product.slug !== "string" ||
typeof item.quantity !== "number" ||
!Number.isSafeInteger(item.quantity) ||
item.quantity <= 0
) {
continue;
}
// Resolve persisted identifiers against the current catalog, never trust stored prices.
const product = getProductBySlug(item.product.slug);
if (product && !items.some((line) => line.product.slug === product.slug)) {
items.push({ product, quantity: item.quantity });
}
}
return items;
} catch {
return [];
}
}
/**
* Client-side cart provider with reducer state and localStorage persistence.
*/
export function CartProvider({
children,
initialState,
persist = true,
}: CartProviderProps): ReactNode {
const [state, dispatch] = useReducer(cartReducer, initialState ?? initialCartState);
useEffect(() => {
if (!persist || initialState) {
return;
}
try {
dispatch({
items: parseStoredItems(window.localStorage.getItem(storageKey)),
type: "hydrate",
});
} catch {
// Storage can be unavailable; the cart remains usable in memory.
}
}, [initialState, persist]);
useEffect(() => {
if (!persist) {
return;
}
try {
window.localStorage.setItem(storageKey, JSON.stringify(state.items));
} catch {
// Quota or privacy restrictions must not interrupt shopping.
}
}, [persist, state.items]);
const addItem = useCallback((product: Product, quantity?: number) => {
dispatch({ product, quantity, type: "add" });
}, []);
const clearCart = useCallback(() => {
dispatch({ type: "clear" });
}, []);
const closeCart = useCallback(() => {
dispatch({ type: "close" });
}, []);
const decrementItem = useCallback((slug: string) => {
dispatch({ slug, type: "decrement" });
}, []);
const incrementItem = useCallback((slug: string) => {
dispatch({ slug, type: "increment" });
}, []);
const openCart = useCallback(() => {
dispatch({ type: "open" });
}, []);
const removeItem = useCallback((slug: string) => {
dispatch({ slug, type: "remove" });
}, []);
const value = useMemo<CartContextValue>(
() => ({
...state,
addItem,
clearCart,
closeCart,
decrementItem,
incrementItem,
itemCount: getCartItemCount(state.items),
openCart,
removeItem,
subtotalCents: getCartSubtotal(state.items),
}),
[addItem, clearCart, closeCart, decrementItem, incrementItem, openCart, removeItem, state],
);
return <CartContext.Provider value={value}>{children}</CartContext.Provider>;
}
export function useCart(): CartContextValue {
const context = useContext(CartContext);
Iif (!context) {
throw new Error("useCart must be used inside CartProvider.");
}
return context;
}
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