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/**
* CheckoutContext
*
* Centralized state management for checkout flow.
* Eliminates prop drilling through the checkout component hierarchy.
*/
import {
createContext,
useContext,
useReducer,
useMemo,
useCallback,
ReactNode,
} from 'react';
// ============================================================================
// TYPES
// ============================================================================
export interface CheckoutAddress {
id?: number;
firstName: string;
lastName: string;
street: string;
city: string;
state: string;
zipCode: string;
country: string;
phone?: string;
}
export type CheckoutStep = 'shipping' | 'payment' | 'review' | 'confirmation';
export interface CheckoutState {
step: CheckoutStep;
shippingAddress: CheckoutAddress | null;
billingAddress: CheckoutAddress | null;
sameAsShipping: boolean;
shippingMethod: string | null;
paymentMethod: string | null;
isProcessing: boolean;
error: string | null;
}
type CheckoutAction =
| { type: 'SET_STEP'; payload: CheckoutStep }
| { type: 'SET_SHIPPING_ADDRESS'; payload: CheckoutAddress }
| { type: 'SET_BILLING_ADDRESS'; payload: CheckoutAddress }
| { type: 'SET_SAME_AS_SHIPPING'; payload: boolean }
| { type: 'SET_SHIPPING_METHOD'; payload: string }
| { type: 'SET_PAYMENT_METHOD'; payload: string }
| { type: 'SET_PROCESSING'; payload: boolean }
| { type: 'SET_ERROR'; payload: string | null }
| { type: 'RESET' };
// ============================================================================
// INITIAL STATE
// ============================================================================
const initialState: CheckoutState = {
step: 'shipping',
shippingAddress: null,
billingAddress: null,
sameAsShipping: true,
shippingMethod: null,
paymentMethod: null,
isProcessing: false,
error: null,
};
// ============================================================================
// REDUCER
// ============================================================================
function checkoutReducer(
state: CheckoutState,
action: CheckoutAction
): CheckoutState {
switch (action.type) {
case 'SET_STEP':
return { ...state, step: action.payload, error: null };
case 'SET_SHIPPING_ADDRESS':
return {
...state,
shippingAddress: action.payload,
billingAddress: state.sameAsShipping
? action.payload
: state.billingAddress,
};
case 'SET_BILLING_ADDRESS':
return { ...state, billingAddress: action.payload };
case 'SET_SAME_AS_SHIPPING':
return {
...state,
sameAsShipping: action.payload,
billingAddress: action.payload
? state.shippingAddress
: state.billingAddress,
};
case 'SET_SHIPPING_METHOD':
return { ...state, shippingMethod: action.payload };
case 'SET_PAYMENT_METHOD':
return { ...state, paymentMethod: action.payload };
case 'SET_PROCESSING':
return { ...state, isProcessing: action.payload };
case 'SET_ERROR':
return { ...state, error: action.payload, isProcessing: false };
case 'RESET':
return initialState;
default:
return state;
}
}
// ============================================================================
// CONTEXT
// ============================================================================
export interface CheckoutContextValue extends CheckoutState {
// Actions
setStep: (step: CheckoutStep) => void;
setShippingAddress: (address: CheckoutAddress) => void;
setBillingAddress: (address: CheckoutAddress) => void;
setSameAsShipping: (same: boolean) => void;
setShippingMethod: (method: string) => void;
setPaymentMethod: (method: string) => void;
setProcessing: (processing: boolean) => void;
setError: (error: string | null) => void;
reset: () => void;
// Computed values
canProceed: boolean;
isComplete: boolean;
}
const CheckoutContext = createContext<CheckoutContextValue | null>(null);
// ============================================================================
// PROVIDER
// ============================================================================
interface CheckoutProviderProps {
children: ReactNode;
initialStep?: CheckoutStep;
}
export function CheckoutProvider({
children,
initialStep = 'shipping',
}: CheckoutProviderProps) {
const [state, dispatch] = useReducer(checkoutReducer, {
...initialState,
step: initialStep,
});
// Memoized action creators
const setStep = useCallback((step: CheckoutStep) => {
dispatch({ type: 'SET_STEP', payload: step });
}, []);
const setShippingAddress = useCallback((address: CheckoutAddress) => {
dispatch({ type: 'SET_SHIPPING_ADDRESS', payload: address });
}, []);
const setBillingAddress = useCallback((address: CheckoutAddress) => {
dispatch({ type: 'SET_BILLING_ADDRESS', payload: address });
}, []);
const setSameAsShipping = useCallback((same: boolean) => {
dispatch({ type: 'SET_SAME_AS_SHIPPING', payload: same });
}, []);
const setShippingMethod = useCallback((method: string) => {
dispatch({ type: 'SET_SHIPPING_METHOD', payload: method });
}, []);
const setPaymentMethod = useCallback((method: string) => {
dispatch({ type: 'SET_PAYMENT_METHOD', payload: method });
}, []);
const setProcessing = useCallback((processing: boolean) => {
dispatch({ type: 'SET_PROCESSING', payload: processing });
}, []);
const setError = useCallback((error: string | null) => {
dispatch({ type: 'SET_ERROR', payload: error });
}, []);
const reset = useCallback(() => {
dispatch({ type: 'RESET' });
}, []);
// Computed values
const canProceed = useMemo(() => {
switch (state.step) {
case 'shipping':
return !!state.shippingAddress && !!state.shippingMethod;
case 'payment':
return !!state.paymentMethod;
case 'review':
return !state.isProcessing;
case 'confirmation':
return true;
default:
return false;
}
}, [
state.step,
state.shippingAddress,
state.shippingMethod,
state.paymentMethod,
state.isProcessing,
]);
const isComplete = useMemo(() => {
return state.step === 'confirmation';
}, [state.step]);
// Memoized context value
const value = useMemo<CheckoutContextValue>(
() => ({
...state,
setStep,
setShippingAddress,
setBillingAddress,
setSameAsShipping,
setShippingMethod,
setPaymentMethod,
setProcessing,
setError,
reset,
canProceed,
isComplete,
}),
[
state,
setStep,
setShippingAddress,
setBillingAddress,
setSameAsShipping,
setShippingMethod,
setPaymentMethod,
setProcessing,
setError,
reset,
canProceed,
isComplete,
]
);
return (
<CheckoutContext.Provider value={value}>
{children}
</CheckoutContext.Provider>
);
}
// ============================================================================
// HOOK
// ============================================================================
/**
* Hook to access checkout context
* @throws Error if used outside CheckoutProvider
*/
export function useCheckout(): CheckoutContextValue {
const context = useContext(CheckoutContext);
if (!context) {
throw new Error('useCheckout must be used within a CheckoutProvider');
}
return context;
}
/**
* Hook to access specific checkout step state
* Provides optimized subscription to avoid unnecessary re-renders
*/
export function useCheckoutStep(): {
step: CheckoutStep;
setStep: (step: CheckoutStep) => void;
canProceed: boolean;
} {
const { step, setStep, canProceed } = useCheckout();
return { step, setStep, canProceed };
}
/**
* Hook to access shipping-related checkout state
*/
export function useCheckoutShipping() {
const {
shippingAddress,
shippingMethod,
setShippingAddress,
setShippingMethod,
} = useCheckout();
return {
shippingAddress,
shippingMethod,
setShippingAddress,
setShippingMethod,
};
}
/**
* Hook to access billing-related checkout state
*/
export function useCheckoutBilling() {
const {
billingAddress,
sameAsShipping,
setBillingAddress,
setSameAsShipping,
shippingAddress,
} = useCheckout();
return {
billingAddress,
sameAsShipping,
setBillingAddress,
setSameAsShipping,
shippingAddress,
};
}
export default CheckoutContext;
|