Add all files

app/Classes/Cart.php

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+<?php
+
+namespace App\Classes;
+
+use App\Exceptions\DisplayException;
+use App\Models\Coupon;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Session;
+
+class Cart
+{
+    public static function get()
+    {
+        return collect(session('cart', []));
+    }
+
+    public static function add($product, $plan, $configOptions, $checkoutConfig, Price $price, $quantity = 1, $key = null)
+    {
+        if (isset($key)) {
+            $cart = self::get();
+            // Check if key exists
+            $cart[$key] = (object) [
+                'product' => (object) $product,
+                'plan' => (object) $plan,
+                'configOptions' => (object) $configOptions,
+                'checkoutConfig' => (object) $checkoutConfig,
+                'price' => $price,
+                'quantity' => $quantity,
+            ];
+        } else {
+            $cart = self::get()->push((object) [
+                'product' => (object) $product,
+                'plan' => (object) $plan,
+                'configOptions' => (object) $configOptions,
+                'checkoutConfig' => (object) $checkoutConfig,
+                'price' => $price,
+                'quantity' => $quantity,
+            ]);
+        }
+
+        session(['cart' => $cart]);
+
+        if (Session::has('coupon')) {
+            // Reapply coupon to the cart
+            try {
+                $coupon = Session::get('coupon');
+                self::removeCoupon();
+                self::applyCoupon($coupon->code);
+            } catch (DisplayException $e) {
+                // Ignore exception
+            }
+        }
+
+        // Return index of the newly added item
+        return $key ?? $cart->count() - 1;
+    }
+
+    public static function remove($index)
+    {
+        $cart = self::get();
+        $cart->forget($index);
+        session(['cart' => $cart]);
+    }
+
+    /**
+     * Validate if a coupon is valid for the current user and cart
+     *
+     * @param  string  $coupon_code
+     * @return \App\Models\Coupon
+     *
+     * @throws \App\Exceptions\DisplayException
+     */
+    public static function validateCoupon($coupon_code)
+    {
+        $coupon = Coupon::where('code', $coupon_code)->first();
+
+        if (!$coupon) {
+            throw new DisplayException('Coupon code not found');
+        }
+
+        if ($coupon->expires_at && $coupon->expires_at->isPast()) {
+            throw new DisplayException('Coupon code has expired');
+        }
+        if ($coupon->starts_at && $coupon->starts_at->isFuture()) {
+            throw new DisplayException('Coupon code is not active yet');
+        }
+        if ($coupon->max_uses && $coupon->services->count() >= $coupon->max_uses) {
+            throw new DisplayException('Coupon code has reached its maximum uses');
+        }
+        if (Auth::check() && $coupon->hasExceededMaxUsesPerUser(Auth::id())) {
+            throw new DisplayException('You have already used this coupon the maximum number of times allowed');
+        }
+
+        return $coupon;
+    }
+
+    public static function applyCoupon($code)
+    {
+        $coupon = self::validateCoupon($code);
+
+        $wasSuccessful = false;
+        $items = self::get()->map(function ($item) use ($coupon, &$wasSuccessful) {
+            if ($coupon->products->where('id', $item->product->id)->isEmpty() && $coupon->products->isNotEmpty()) {
+                return (object) $item;
+            }
+            $wasSuccessful = true;
+            $discount = 0;
+            if ($coupon->type === 'percentage') {
+                $discount = $item->price->price * $coupon->value / 100;
+            } elseif ($coupon->type === 'fixed') {
+                $discount = $coupon->value;
+            } else {
+                $discount = $item->price->setup_fee;
+                $item->price->setup_fee = 0;
+            }
+            if ($item->price->price < $discount) {
+                $discount = $item->price->price;
+            }
+            $item->price->setDiscount($discount);
+            $item->price->price -= $discount;
+
+            return (object) $item;
+        });
+
+        session(['cart' => $items]);
+        Session::put(['coupon' => $coupon]);
+
+        if ($wasSuccessful) {
+            return $items;
+        } else {
+            throw new DisplayException('Coupon code is not valid for any items in your cart');
+        }
+    }
+
+    /**
+     * Validates and refreshes the coupon in the session
+     *
+     * @return bool True if coupon is valid, false otherwise
+     */
+    public static function validateAndRefreshCoupon()
+    {
+        if (!Session::has('coupon')) {
+            return true;
+        }
+
+        try {
+            $coupon = Session::get('coupon');
+            self::validateCoupon($coupon->code);
+
+            return true;
+        } catch (DisplayException $e) {
+            // Coupon is invalid, remove it
+            self::removeCoupon();
+
+            return false;
+        }
+    }
+
+    public static function removeCoupon()
+    {
+        Session::forget('coupon');
+        $items = self::get()->map(function ($item) {
+            $item->price = new Price([
+                'price' => $item->price->original_price,
+                'setup_fee' => $item->price->original_setup_fee,
+                'currency' => $item->price->currency,
+            ], apply_exclusive_tax: true);
+
+            return (object) $item;
+        });
+        session(['cart' => $items]);
+    }
+}