Add dynamic subscription calculation

src/static/scripts/subscriptions.js

@@ -0,0 +1,128 @@
+class Subscription {
+    static TWELVE_OZ
+    static SIXTEEN_OZ
+    static FIVE_LBS
+
+    static TWELVE_SHIPPING
+    static SIXTEEN_SHIPPING
+    static FIVE_SHIPPING
+
+    constructor(element, output) {
+        this.TWELVE_OZ = '12'
+        this.SIXTEEN_OZ = '16'
+        this.FIVE_LBS = '75'
+        this.TWELVE_SHIPPING = 7
+        this.SIXTEEN_SHIPPING = 5
+        this.FIVE_SHIPPING = 1
+
+        this.element = element
+        this.output = this.element.querySelector('.output')
+        this.shippingDiscount = 10
+        this.price = this.element.querySelector('select[name=size]')
+        this.products = this.element.querySelectorAll('input[name^=product]')
+        this.element.addEventListener('change', this.render.bind(this))
+        this.render()
+    }
+
+    get total_qty() {
+        return Array.from(this.products).reduce((total, current) => {
+            return total + Number(current.value)
+        }, 0)
+    }
+
+    get hasFreeShipping() {
+        switch(this.price.value) {
+            case this.TWELVE_OZ:
+                if (parseInt(this.total_qty) >= this.TWELVE_SHIPPING) {
+                    return true
+                } else {
+                    return false
+                }
+                break
+            case this.SIXTEEN_OZ:
+                if (parseInt(this.total_qty) >= this.SIXTEEN_SHIPPING) {
+                    return true
+                } else {
+                    return false
+                }
+                break
+            case this.FIVE_LBS:
+                if (parseInt(this.total_qty) >= this.FIVE_SHIPPING) {
+                    return true
+                } else {
+                    return false
+                }
+                break
+            default:
+                throw 'Something is wrong with the price'
+        }
+    }
+
+    get countToFreeShipping() {
+        switch(this.price.value) {
+            case this.TWELVE_OZ:
+                return this.TWELVE_SHIPPING - this.total_qty
+                break
+            case this.SIXTEEN_OZ:
+                return this.SIXTEEN_SHIPPING - this.total_qty
+                break
+            case this.FIVE_LBS:
+                return this.FIVE_SHIPPING
+                break
+            default:
+                throw 'Something is wrong with the price'
+                break
+        }
+    }
+
+    get shippingStatus() {
+        let items = 0
+
+        if (this.hasFreeShipping) {
+            return 'You have free shipping!'
+        } else {
+            return `Add ${this.countToFreeShipping} more item(s) for free shipping!`
+        }
+
+    }
+
+    get totalRetailPrice() {
+        let totalPrice = Array.from(this.products).reduce((total, current) => {
+            return total + (Number(this.price.value) * current.value);
+        }, 0);
+
+        return new Intl.NumberFormat('en-US', {
+            currency: 'USD',
+            style: 'currency',
+        }).format(totalPrice)
+    }
+
+    get totalPrice() {
+        let totalPrice = Array.from(this.products).reduce((total, current) => {
+            return total + (Number(this.price.value) * current.value);
+        }, 0);
+
+        let percentage = (this.shippingDiscount / 100) * totalPrice
+
+
+        return new Intl.NumberFormat('en-US', {
+            currency: 'USD',
+            style: 'currency',
+        }).format(totalPrice - percentage)
+    }
+
+    render() {
+        this.output.querySelector('.retail-price').innerText = this.totalRetailPrice
+        this.output.querySelector('.price').innerText = this.totalPrice
+        this.output.querySelector('.shipping').innerText = this.shippingStatus
+    }
+
+    add_item(item) {
+        this.items.push(item)
+        return this.items
+    }
+}
+
+
+const subCreateFromEl = document.querySelector('.subscription-create-form')
+const sub = new Subscription(subCreateFromEl)

src/static/styles/main.css

@@ -639,7 +639,7 @@ article + article {
 }
 
 
-.create-subscription-form {
+.subscription-create-form {
     display: grid;
     grid-template-columns: 2fr 1fr;
     gap: 2rem;
@@ -649,11 +649,11 @@ article + article {
     display: grid;
     grid-template-columns: repeat(2, 1fr);
     justify-items: center;
-    gap: 8rem;
+    gap: 6rem;
     overflow-y: scroll;
     max-height: 50rem;
     border-bottom: var(--default-border);
-    padding: 0 4rem 4rem;
+    padding: 0 2rem 2rem;
 }
 
 .product__subscription-list div {

src/storefront/forms.py

@@ -178,13 +178,13 @@ class SubscriptionCreateForm(forms.Form):
 
     TWELVE_OZ = 12
     SIXTEEN_OZ = 16
-    FIVE_LBS = 5
+    FIVE_LBS = 75
     SIZE_CHOICES = [
-        (TWELVE_OZ, '12oz'),
-        (SIXTEEN_OZ, '16oz'),
-        (FIVE_LBS, '5lbs'),
+        (TWELVE_OZ, '12 oz ($10.80)'),
+        (SIXTEEN_OZ, '16 oz ($14.40)'),
+        (FIVE_LBS, '5 lbs ($67.50)'),
     ]
 
-    size = forms.ChoiceField(choices=SIZE_CHOICES)
     grind = forms.ChoiceField(choices=CoffeeGrind.GRIND_CHOICES)
     schedule = forms.ChoiceField(choices=SCHEDULE_CHOICES)
+    size = forms.ChoiceField(choices=SIZE_CHOICES)

src/storefront/templates/storefront/subscriptions.html

@@ -2,10 +2,7 @@
 {% load static %}
 
 {% block head %}
-    <script defer src="{% static 'scripts/product_list.js' %}"></script>
-    <link rel="stylesheet" href="{% static 'styles/checkout.css' %}" />
-    <script src="https://js.stripe.com/v3/"></script>
-    <script src="{% static 'scripts/checkout.js' %}" defer></script>
+    <script src="{% static 'scripts/subscriptions.js' %}" defer></script>
 {% endblock %}
 
 {% block content %}
@@ -15,7 +12,7 @@
 </div>
 <article>
     <section class="">
-        <form action="" class="create-subscription-form">
+        <form action="" class="subscription-create-form">
             {% csrf_token %}
             <div>
                 <h4>Pick your coffee</h4>
@@ -33,9 +30,26 @@
                     {% endfor %}
                 </div>
             </div>
-            <div>
+            <div class="output">
                 <h4>Pick your options</h4>
                 {{ form.as_p }}
+                <div class="cart__table-wrapper">
+                    <table class="cart__totals">
+                        <tr>
+                            <td>Retail total</td>
+                            <td><del class="retail-price"></del></td>
+                        </tr>
+                        <tr>
+                            <td>Save</td>
+                            <td>10%</td>
+                        </tr>
+                        <tr>
+                            <th>Subscription total</th>
+                            <td><strong class="price"></strong></td>
+                        </tr>
+                    </table>
+                </div>
+                <p class="shipping"></p>
                 <p>
                     <input type="submit" value="Continue to payment">
                 </p>