From 3bdc8783461a1f63318a5efc8a2d7b1be120c54e Mon Sep 17 00:00:00 2001
From: Matt Solomon <matt@mattsolomon.dev>
Date: Thu, 12 Aug 2021 14:58:05 -0700
Subject: [PATCH] feat: setup cart page

---
 app/src/components/LayoutHeader.vue |  2 +-
 app/src/router/index.ts             |  1 +
 app/src/types/index.ts              |  5 +++
 app/src/utils/utils.ts              | 11 +++----
 app/src/views/Cart.vue              | 47 +++++++++++++++++++++++++++++
 5 files changed, 58 insertions(+), 8 deletions(-)
 create mode 100644 app/src/views/Cart.vue

diff --git a/app/src/components/LayoutHeader.vue b/app/src/components/LayoutHeader.vue
index efae7a96..a94cb690 100644
--- a/app/src/components/LayoutHeader.vue
+++ b/app/src/components/LayoutHeader.vue
@@ -53,7 +53,7 @@ import { ExclamationIcon } from '@heroicons/vue/solid';
 const navigation = [
   { name: 'Home', href: '/' },
   { name: 'About', href: '/about' },
-  { name: 'Docs', href: '/docs' },
+  { name: 'Cart', href: '/cart' },
   { name: 'Contact', href: '/contact' },
 ];
 
diff --git a/app/src/router/index.ts b/app/src/router/index.ts
index 07951a3f..a6a6d1ef 100644
--- a/app/src/router/index.ts
+++ b/app/src/router/index.ts
@@ -12,6 +12,7 @@ import Home from '../views/Home.vue';
 const routes: Array<RouteRecordRaw> = [
   { path: '/', name: 'Home', component: Home },
   { path: '/about', name: 'About', component: () => import('../views/About.vue') },
+  { path: '/cart', name: 'Cart', component: () => import('../views/Cart.vue') },
   { path: '/dgrants', name: 'dgrants', component: () => import('../views/GrantRegistryList.vue') },
   { path: '/dgrants/new', name: 'dgrants-new', component: () => import('../views/GrantRegistryNewGrant.vue') },
   { path: '/dgrants/:id', name: 'dgrants-id', component: () => import('../views/GrantRegistryGrantDetail.vue') },
diff --git a/app/src/types/index.ts b/app/src/types/index.ts
index ff4bb9cf..95a08745 100644
--- a/app/src/types/index.ts
+++ b/app/src/types/index.ts
@@ -1 +1,6 @@
 // App-specific type definition go here
+export type CartItemOptions = {
+  grantId: string;
+  contributionTokenAddress: string; // store address instead of TokenInfo to reduce localStorage size used
+  contributionAmount: string;
+};
diff --git a/app/src/utils/utils.ts b/app/src/utils/utils.ts
index 2e9ea4d8..597b3c61 100644
--- a/app/src/utils/utils.ts
+++ b/app/src/utils/utils.ts
@@ -4,6 +4,7 @@
 import router from 'src/router/index';
 import { RouteLocationRaw } from 'vue-router';
 import { BigNumber, isAddress, parseUnits } from 'src/utils/ethers';
+import { CartItemOptions } from 'src/types';
 import { BigNumberish, Contract, ContractTransaction } from 'ethers';
 import { Grant, GrantRound } from '@dgrants/types';
 
@@ -45,14 +46,9 @@ export function isValidAddress(val: string | undefined) {
 const CART_KEY = 'cart';
 const DEFAULT_CONTRIBUTION_TOKEN_ADDRESS = '0x6B175474E89094C44Da98b954EedeAC495271d0F'; // DAI
 const DEFAULT_CONTRIBUTION_AMOUNT = parseUnits('5', 18).toString(); // DAI has 18 decimals
-type CartItem = {
-  grantId: string;
-  contributionTokenAddress: string; // store address instead of TokenInfo to reduce localStorage size used
-  contributionAmount: string;
-};
 
 // Loads cart data
-export function loadCart(): CartItem[] {
+export function loadCart(): CartItemOptions[] {
   // Return empty array if nothing found
   const rawCart = localStorage.getItem(CART_KEY);
   if (!rawCart) return [];
@@ -67,7 +63,8 @@ export function loadCart(): CartItem[] {
 }
 
 // Adds a grant to the cart
-export function addToCart(grant: Grant) {
+export function addToCart(grant: Grant | null | undefined) {
+  if (!grant) return; // null and undefined input types are to avoid lint errors when calling this from a template
   // If this grant is already in the cart, do nothing
   const cart = loadCart();
   if (cart.map((grant) => grant.grantId).includes(grant.id.toString())) return;
diff --git a/app/src/views/Cart.vue b/app/src/views/Cart.vue
new file mode 100644
index 00000000..9baedf1f
--- /dev/null
+++ b/app/src/views/Cart.vue
@@ -0,0 +1,47 @@
+<template>
+  <h1 class="my-6 text-center text-3xl font-extrabold text-gray-900">Cart</h1>
+
+  <div v-if="cart.length === 0">
+    <div>Your cart is empty</div>
+    <button @click="pushRoute({ name: 'dgrants' })" class="btn btn-primary mt-6">Browse Grants</button>
+  </div>
+
+  <div v-else>
+    <div v-for="item in cart" :key="item.grantId" class="mb-10">
+      <div>{{ item }}</div>
+    </div>
+  </div>
+</template>
+
+<script lang="ts">
+import { computed, defineComponent } from 'vue';
+import { pushRoute, loadCart } from 'src/utils/utils';
+import useDataStore from 'src/store/data';
+import { CartItemOptions } from 'src/types';
+import { Grant } from '@dgrants/types';
+
+type CartItem = CartItemOptions & Grant;
+
+function useCart() {
+  const { grants } = useDataStore();
+
+  const cart = computed(() => {
+    // Load cart info form localStorage, then concatenate it with grant data from store
+    const rawCart = loadCart();
+    return rawCart.map((cartItem) => {
+      // grants.value is likely undefined as page first loads before data is fetched, hence the `grants.value &&`
+      const grant = grants.value && grants.value.filter((grant) => grant.id.toString() === cartItem.grantId)[0]; // TODO `grants.value.filter` may be slow for large number of grants
+      return { ...cartItem, ...grant } as CartItem;
+    });
+  });
+
+  return { cart, grants };
+}
+
+export default defineComponent({
+  name: 'Cart',
+  setup() {
+    return { ...useCart(), pushRoute };
+  },
+});
+</script>