first upload all files

Modules/Coupon/Checkers/AlreadyApplied.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Cart\Facades\Cart;
+use Modules\Coupon\Exceptions\CouponAlreadyAppliedException;
+
+class AlreadyApplied
+{
+    public function handle($coupon, Closure $next)
+    {
+        if (Cart::couponAlreadyApplied($coupon)) {
+            throw new CouponAlreadyAppliedException;
+        }
+
+        return $next($coupon);
+    }
+}

Modules/Coupon/Checkers/ApplicableCategories.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Cart\Facades\Cart;
+use Modules\Coupon\Exceptions\InapplicableCouponException;
+
+class ApplicableCategories
+{
+    public function handle($coupon, Closure $next)
+    {
+        $coupon->load('categories');
+
+        if ($coupon->categories->isEmpty()) {
+            return $next($coupon);
+        }
+
+        $cartItems = Cart::items()->filter(function ($cartItem) use ($coupon) {
+            return $coupon->categories->intersect($cartItem->product->categories)->isNotEmpty();
+        });
+
+        if ($cartItems->isEmpty()) {
+            throw new InapplicableCouponException;
+        }
+
+        return $next($coupon);
+    }
+}

Modules/Coupon/Checkers/ApplicableProducts.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Cart\Facades\Cart;
+use Modules\Coupon\Exceptions\InapplicableCouponException;
+
+class ApplicableProducts
+{
+    public function handle($coupon, Closure $next)
+    {
+        $coupon->load('products');
+
+        if ($coupon->products->isEmpty()) {
+            return $next($coupon);
+        }
+
+        $cartItems = Cart::items()->filter(function ($cartItem) use ($coupon) {
+            return $coupon->products->contains($cartItem->product);
+        });
+
+        if ($cartItems->isEmpty()) {
+            throw new InapplicableCouponException;
+        }
+
+        return $next($coupon);
+    }
+}

Modules/Coupon/Checkers/CouponExists.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Coupon\Exceptions\CouponNotExistsException;
+
+class CouponExists
+{
+    public function handle($coupon, Closure $next)
+    {
+        if (is_null($coupon)) {
+            throw new CouponNotExistsException;
+        }
+
+        return $next($coupon);
+    }
+}

Modules/Coupon/Checkers/ExcludedCategories.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Cart\Facades\Cart;
+use Modules\Coupon\Exceptions\InapplicableCouponException;
+
+class ExcludedCategories
+{
+    public function handle($coupon, Closure $next)
+    {
+        $coupon->load('excludeCategories');
+
+        if ($coupon->excludeCategories->isEmpty()) {
+            return $next($coupon);
+        }
+
+        foreach (Cart::items() as $cartItem) {
+            if ($this->inExcludedCategories($coupon, $cartItem)) {
+                throw new InapplicableCouponException;
+            }
+        }
+
+        return $next($coupon);
+    }
+
+    private function inExcludedCategories($coupon, $cartItem)
+    {
+        return $coupon->excludeCategories->intersect($cartItem->product->categories)->isNotEmpty();
+    }
+}

Modules/Coupon/Checkers/ExcludedProducts.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Cart\Facades\Cart;
+use Modules\Coupon\Exceptions\InapplicableCouponException;
+
+class ExcludedProducts
+{
+    public function handle($coupon, Closure $next)
+    {
+        $coupon->load('excludeProducts');
+
+        if ($coupon->excludeProducts->isEmpty()) {
+            return $next($coupon);
+        }
+
+        foreach (Cart::items() as $cartItem) {
+            if ($this->inExcludedProducts($coupon, $cartItem)) {
+                throw new InapplicableCouponException;
+            }
+        }
+
+        return $next($coupon);
+    }
+
+    private function inExcludedProducts($coupon, $cartItem)
+    {
+        return $coupon->excludeProducts->contains($cartItem->product);
+    }
+}

Modules/Coupon/Checkers/MaximumSpend.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Coupon\Exceptions\MaximumSpendException;
+
+class MaximumSpend
+{
+    public function handle($coupon, Closure $next)
+    {
+        if ($coupon->spentMoreThanMaximumAmount()) {
+            throw new MaximumSpendException($coupon->maximum_spend);
+        }
+
+        return $next($coupon);
+    }
+}

Modules/Coupon/Checkers/MinimumSpend.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Coupon\Exceptions\MinimumSpendException;
+
+class MinimumSpend
+{
+    public function handle($coupon, Closure $next)
+    {
+        if ($coupon->didNotSpendTheRequiredAmount()) {
+            throw new MinimumSpendException($coupon->minimum_spend);
+        }
+
+        return $next($coupon);
+    }
+}

Modules/Coupon/Checkers/UsageLimitPerCoupon.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Coupon\Exceptions\CouponUsageLimitReachedException;
+
+class UsageLimitPerCoupon
+{
+    public function handle($coupon, Closure $next)
+    {
+        if ($coupon->usageLimitReached()) {
+            throw new CouponUsageLimitReachedException;
+        }
+
+        return $next($coupon);
+    }
+}

Modules/Coupon/Checkers/UsageLimitPerCustomer.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Coupon\Exceptions\CouponUsageLimitReachedException;
+
+class UsageLimitPerCustomer
+{
+    public function handle($coupon, Closure $next)
+    {
+        if ($coupon->perCustomerUsageLimitReached()) {
+            throw new CouponUsageLimitReachedException;
+        }
+
+        return $next($coupon);
+    }
+}

Modules/Coupon/Checkers/ValidCoupon.php

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+<?php
+
+namespace Modules\Coupon\Checkers;
+
+use Closure;
+use Modules\Coupon\Exceptions\InvalidCouponException;
+
+class ValidCoupon
+{
+    public function handle($coupon, Closure $next)
+    {
+        if ($coupon->invalid()) {
+            throw new InvalidCouponException;
+        }
+
+        return $next($coupon);
+    }
+}