Complete use-cart hook

Signed-off-by: Chloe <pinkcloudvnn@gmail.com>

packages/opencommerce/src/cart/use-add-item.tsx

@@ -1,17 +1,42 @@
+import { useCallback } from 'react'
 import useAddItem, { UseAddItem } from '@vercel/commerce/cart/use-add-item'
+import type { AddItemHook } from '@vercel/commerce/types/cart'
+import { CommerceError } from '@vercel/commerce/utils/errors'
 import { MutationHook } from '@vercel/commerce/utils/types'
+import useCart from './use-cart'
 
 export default useAddItem as UseAddItem<typeof handler>
-export const handler: MutationHook<any> = {
+
+export const handler: MutationHook<AddItemHook> = {
   fetchOptions: {
-    query: '',
+    url: '/api/cart',
+    method: 'POST',
+  },
+  async fetcher({ input: item, options, fetch }) {
+    if (
+      item.quantity &&
+      (!Number.isInteger(item.quantity) || item.quantity! < 1)
+    ) {
+      throw new CommerceError({
+        message: 'The item quantity has to be a valid integer greater than 0',
+      })
+    }
+
+    const data = await fetch({ ...options, body: { item } })
+    return data
   },
-  async fetcher({ input, options, fetch }) {},
   useHook:
     ({ fetch }) =>
     () => {
-      return async function addItem() {
-        return {}
-      }
+      const { mutate } = useCart()
+
+      return useCallback(
+        async function addItem(input) {
+          const data = await fetch({ input })
+          await mutate(data, false)
+          return data
+        },
+        [fetch, mutate]
+      )
     },
 }

packages/opencommerce/src/cart/use-cart.tsx

@@ -1,42 +1,32 @@
 import { useMemo } from 'react'
 import { SWRHook } from '@vercel/commerce/utils/types'
 import useCart, { UseCart } from '@vercel/commerce/cart/use-cart'
+import type { GetCartHook } from '@vercel/commerce/types/cart'
 
 export default useCart as UseCart<typeof handler>
 
-export const handler: SWRHook<any> = {
+export const handler: SWRHook<GetCartHook> = {
   fetchOptions: {
-    query: '',
-  },
-  async fetcher() {
-    return {
-      id: '',
-      createdAt: '',
-      currency: { code: '' },
-      taxesIncluded: '',
-      lineItems: [],
-      lineItemsSubtotalPrice: '',
-      subtotalPrice: 0,
-      totalPrice: 0,
-    }
+    url: '/api/cart',
+    method: 'GET',
   },
   useHook:
     ({ useData }) =>
     (input) => {
+      const response = useData({
+        swrOptions: { revalidateOnFocus: false, ...input?.swrOptions },
+      })
       return useMemo(
         () =>
-          Object.create(
-            {},
-            {
-              isEmpty: {
-                get() {
-                  return true
-                },
-                enumerable: true,
+          Object.create(response, {
+            isEmpty: {
+              get() {
+                return (response.data?.lineItems.length ?? 0) <= 0
               },
-            }
-          ),
-        []
+              enumerable: true,
+            },
+          }),
+        [response]
       )
     },
 }

packages/opencommerce/src/cart/use-remove-item.tsx

@@ -1,20 +1,59 @@
-import { MutationHook } from '@vercel/commerce/utils/types'
+import { useCallback } from 'react'
+import {
+  HookFetcherContext,
+  MutationHookContext,
+} from '@vercel/commerce/utils/types'
 import useRemoveItem, {
   UseRemoveItem,
 } from '@vercel/commerce/cart/use-remove-item'
+import type {
+  LineItem,
+  RemoveItemHook,
+  Cart,
+} from '@vercel/commerce/types/cart'
+import { ValidationError } from '@vercel/commerce/utils/errors'
+import useCart from './use-cart'
+
+export type RemoveItemActionInput<T = any> = T extends LineItem
+  ? Partial<RemoveItemHook['actionInput']>
+  : RemoveItemHook['actionInput']
+
+export type RemoveItemFn<T = any> = T extends LineItem
+  ? (input?: RemoveItemActionInput<T>) => Promise<Cart | null | undefined>
+  : (input: RemoveItemActionInput<T>) => Promise<Cart | null>
 
 export default useRemoveItem as UseRemoveItem<typeof handler>
 
-export const handler: MutationHook<any> = {
+export const handler = {
   fetchOptions: {
-    query: '',
+    url: '/api/cart',
+    method: 'DELETE',
+  },
+  async fetcher({
+    input: { itemId },
+    options,
+    fetch,
+  }: HookFetcherContext<RemoveItemHook>) {
+    return await fetch({ ...options, body: { itemId } })
   },
-  async fetcher({ input, options, fetch }) {},
   useHook:
-    ({ fetch }) =>
-    () => {
-      return async function removeItem(input) {
-        return {}
+    ({ fetch }: MutationHookContext<RemoveItemHook>) =>
+    <T extends LineItem | undefined = undefined>(ctx: { item?: T } = {}) => {
+      const { item } = ctx
+      const { mutate } = useCart()
+      const removeItem: RemoveItemFn<LineItem> = async (input) => {
+        const itemId = input?.id ?? item?.id
+        if (!itemId) {
+          throw new ValidationError({
+            message: 'Invalid input used for this operation',
+          })
+        }
+
+        const data = await fetch({ input: { itemId } })
+        await mutate(data, false)
+        return data
       }
+
+      return useCallback(removeItem, [fetch, mutate])
     },
 }

packages/opencommerce/src/cart/use-update-item.tsx

@@ -1,20 +1,76 @@
-import { MutationHook } from '@vercel/commerce/utils/types'
+import { useCallback } from 'react'
+import debounce from 'lodash.debounce'
+import { MutationHook, MutationHookContext } from '@vercel/commerce/utils/types'
 import useUpdateItem, {
   UseUpdateItem,
 } from '@vercel/commerce/cart/use-update-item'
+import type { LineItem, UpdateItemHook } from '@vercel/commerce/types/cart'
+import { ValidationError } from '@vercel/commerce/utils/errors'
+import { handler as removeItemHandler } from './use-remove-item'
+import useCart from './use-cart'
 
-export default useUpdateItem as UseUpdateItem<any>
+export type UpdateItemActionInput<T = any> = T extends LineItem
+  ? Partial<UpdateItemHook['actionInput']>
+  : UpdateItemHook['actionInput']
 
-export const handler: MutationHook<any> = {
+export default useUpdateItem as UseUpdateItem<typeof handler>
+
+export const handler: MutationHook<UpdateItemHook> = {
   fetchOptions: {
-    query: '',
+    query: '/api/cart',
+    method: 'PUT',
   },
-  async fetcher({ input, options, fetch }) {},
-  useHook:
-    ({ fetch }) =>
-    () => {
-      return async function addItem() {
-        return {}
+  async fetcher({ input: { itemId, item }, options, fetch }) {
+    if (Number.isInteger(item.quantity)) {
+      // Also allow the update hook to remove an item if the quantity is lower than 1
+      if (item.quantity! < 1) {
+        return removeItemHandler.fetcher({
+          options: removeItemHandler.fetchOptions,
+          input: { itemId },
+          fetch,
+        })
       }
+    } else if (item.quantity) {
+      throw new ValidationError({
+        message: 'The item quantity has to be a valid integer',
+      })
+    }
+
+    return await fetch({
+      ...options,
+      body: { itemId, item },
+    })
+  },
+  useHook:
+    ({ fetch }: MutationHookContext<UpdateItemHook>) =>
+    <T extends LineItem | undefined = undefined>(
+      ctx: { item?: T; wait?: number } = {}
+    ) => {
+      const { item, wait } = ctx
+      const { mutate } = useCart()
+
+      return useCallback(
+        debounce(async (input: UpdateItemActionInput) => {
+          const itemId = input.id ?? item?.id
+          const productId = input.productId ?? item?.productId
+          const variantId = input.productId ?? item?.variantId
+
+          if (!itemId || !productId || !variantId) {
+            throw new ValidationError({
+              message: 'Invalid input used for this operation',
+            })
+          }
+
+          const data = await fetch({
+            input: {
+              itemId,
+              item: { productId, variantId, quantity: input.quantity },
+            },
+          })
+          await mutate(data, false)
+          return data
+        }, wait ?? 500),
+        [fetch, mutate]
+      )
     },
 }