Cart protections

components/card/card.js

@@ -1,12 +1,23 @@
 import React from 'react'
 import Link from 'next/link'
 
+import useCart from '../../hooks/useCart'
 import styles from './style.module.css'
+import axios from 'axios'
 
-export default function Card({item, numberInCart}) {
+export default function Card({item}) {
+  const [cart, setCart] = useCart()
+  const numInCart = cart?.items?.find(i => i.item.uuid === item.uuid)?.count || 0
   let featuredImage = item.images.filter(i=>i.featured)[0]
   if(!featuredImage) featuredImage = item.images[0]
 
+  const addToCart = async ev => {
+    if(ev) ev.preventDefault()
+
+    const {data: newCart} = await axios.post(`/api/cart/add/${item.uuid}`, {count: 1})
+    setCart(newCart)
+  }
+
   return (
     <div className={styles.card}>
       <h3><Link href={`/store/item/${item.urlslug}`}><a>{item.name}</a></Link></h3>
@@ -24,14 +35,19 @@ export default function Card({item, numberInCart}) {
                 : 'Currently out of stock'
             }
           </li>
-          <li><Link href={`/store/sock/${item.urlSlug}`}><a>Details</a></Link></li>
+          <li><Link href={`/store/item/${item.urlslug}`}><a>Details</a></Link></li>
           {
             item.number_in_stock > 0 && (
               <li>
-                <a disabled={!(item.number_in_stock > 0)}>Add to Cart</a>
+                <button className="buttonLink" onClick={addToCart}>Add to Cart</button>
               </li>
             )
           }
+          {numInCart > 0 && (
+            <li>
+              ({numInCart} in <Link href="/store/cart"><a>cart</a></Link>)
+            </li>
+          )}
         </ul>
     </div>
   )

components/card/style.module.css

@@ -38,7 +38,7 @@
   border-bottom:solid 1px black;
 }
 
-.card a:hover{
+.card a:hover, .card button:global(.buttonLink):hover{
   color: #760c88;
   border-color: #760c88;
   transition: .2s ease-in-out;
@@ -80,7 +80,8 @@
   box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
 }
 
-.card p, .card a{
+.card p, .card a, .card button:global(.buttonLink){
+  font-family: inherit;
   color:black;
   opacity:.87;
 }

components/header/header.js

@@ -2,10 +2,12 @@ import Link from "next/link"
 import PropTypes from "prop-types"
 import React from "react"
 
+import useCart from '../../hooks/useCart'
 import logo from './sos-logo.png'
 import styles from './style.module.css'
 
-const Header = ({user, cart}) => {
+const Header = ({user}) => {
+  const [cart] = useCart()
   const cartSize = (cart && cart.items.length) ? cart.items.map(item => item.count).reduce((sum, current) => (sum + current)) : 0
 
   return (

db/sql/2-views.sql

@@ -14,8 +14,8 @@ create or replace view sos.v_item as
       (
         select
           stockchange_item_uuid,
-          sum(case when stockchange_direction = 'added' then stockchange_change end)::int4 as num_added,
-          sum(case when stockchange_direction = 'subtracted' then stockchange_change end)::int4 as num_removed
+          coalesce(sum(case when stockchange_direction = 'added' then stockchange_change end)::int4, 0) as num_added,
+          coalesce(sum(case when stockchange_direction = 'subtracted' then stockchange_change end)::int4, 0) as num_removed
         from sos."item_stockchange"
           group by stockchange_item_uuid
       ) stock_counts

hooks/useCart.js

@@ -0,0 +1,6 @@
+import React, {useContext} from 'react'
+
+const CartContext = React.createContext(null);
+
+export const CartContextProvider = CartContext.Provider;
+export default () => useContext(CartContext)

pages/_app.js

@@ -2,6 +2,7 @@ import React, {useState} from "react"
 import PropTypes from "prop-types"
 import axios from 'axios'
 
+import {CartContextProvider} from '../hooks/useCart'
 import Header from '~/components/header'
 import Footer from '~/components/footer'
 import "../styles/layout.css"
@@ -30,14 +31,14 @@ Layout.getInitialProps = async ({Component, ctx}) => {
 }
 
 function Layout({ Component, pageProps, user, cart: _cart }){
-  const [cart, setCart] = useState(_cart)
+  const cartState = useState(_cart)
 
   return (
-    <>
-      <Header user={user} cart={cart} />
-      <main><Component {...{user, cart, setCart, ...pageProps}} /></main>
+    <CartContextProvider value={cartState}>
+      <Header user={user} />
+      <main><Component {...{user, ...pageProps}} /></main>
       <Footer/>
-    </>
+    </CartContextProvider>
   )
 }
 

pages/store/cart.js

@@ -1,12 +1,16 @@
 import React from 'react'
+import Link from 'next/link'
 import axios from 'axios'
 import Head from 'next/head'
 
+import useCart from '../../hooks/useCart'
 import {FormController, Input, Button} from '~/components/form'
 import Table from '~/components/table'
 
-export default function Cart({cart, setCart}){
+export default function Cart(){
+  const [cart, setCart] = useCart()
   const numItems = (cart?.items) ? cart.items.length : 0
+  const allInStock = !cart?.items.some(item => !item.number_in_stock || item.number_in_stock < 1)
 
   const handleRemove = id => async ev => {
     if(ev) ev.preventDefault()
@@ -28,7 +32,12 @@ export default function Cart({cart, setCart}){
         numItems > 0
           ?<Table
             columns={[
-              {name: 'Item', extractor: row => row.item.name},
+              {name: 'Item', extractor: row => (
+                <>
+                  <Link href={`/store/item/${row.item.urlslug}`}><a>{row.item.name}</a></Link>
+                  {(!row.item.number_in_stock || row.item.number_in_stock < 1) && <strong style={{marginLeft: '6px'}}>Out of stock</strong>}
+                </>
+              )},
               {name: 'Quantity in Cart', extractor: row => row.count},
               {name: 'Price Each', extractor: row => '$' + (row.item.price_cents / 100).toFixed(2)},
               {name: 'Total Price', extractor: row => '$' + (row.count * row.item.price_cents / 100).toFixed(2)},
@@ -63,7 +72,7 @@ export default function Cart({cart, setCart}){
       }
 
       <FormController>
-        <Button enabled={!!(cart?.items?.length)} type="submit">Proceed to Checkout</Button>
+        <Button enabled={!!(cart?.items?.length) && allInStock} type="submit">Proceed to Checkout</Button>
       </FormController>
     </>
   )

pages/store/item/[slug].js

@@ -4,6 +4,7 @@ import Router from 'next/router'
 import {FormController, NumInput, Button} from '~/components/form'
 import isNum from 'validator/lib/isNumeric'
 
+import useCart from '../../../hooks/useCart'
 import styles from './style.module.css'
 
 Item.getInitialProps = async function({ctx: {axios, query: {slug}}}){
@@ -19,7 +20,8 @@ Item.getInitialProps = async function({ctx: {axios, query: {slug}}}){
 }
 
 // TODO: Modal with full image size on clicking preview
-export default function Item({item, cart, setCart}){
+export default function Item({item}){
+  const [cart, setCart] = useCart()
   // Pick first one with featured flag or 0
   const featuredIndex = item.images.reduce((p, im, i) => ((p !== undefined) ? p : (im.featured ? i : undefined)), undefined) || 0
   const [selectedIndex, setSelected] = useState(featuredIndex);
@@ -55,7 +57,12 @@ export default function Item({item, cart, setCart}){
 
             <FormController className={styles.form} url={`/api/cart/add/${item.uuid}`} afterSubmit={(cart)=>{setCart(cart); Router.push('/store/cart')}}>
               <NumInput label="Add to cart" name="count" initialValue="1" minimum="1" validate={value=>isNum(value, {no_symbols: true})} />
-              <Button type="submit">Add to cart</Button>
+              {
+                item.number_in_stock > 0
+                  ? <Button type="submit">Add to cart</Button>
+                  : <Button enabled={false} type="submit">Out of stock</Button>
+              }
+
             </FormController>
 
             <div className={styles.notes}>