README

With this package, you can add both simple and conditional discount coupon features to your application. You can develop your own custom conditions, which will be automatically checked when a discount coupon is applied. If a condition is violated, an error will be returned and the coupon will not be allowed to be used by the user.

Installation

You can install the package via composer:

composer require mohammadmehrabani/conditional-coupon

You can publish and run the migrations with:

php artisan vendor:publish --tag="conditional-coupon-migrations"
php artisan migrate

You can publish the config file with:

php artisan vendor:publish --tag="conditional-coupon-config"

This is the contents of the published config file:

return [
    'conditions' => [
        // Add custom check condition classes Implemented \MohammadMehrabani\ConditionalCoupon\CheckConditionAbstract 
        // for example:
        // \App\CheckUsageLimitCondition::class => 'Usage limit',
        // \App\CheckPaymentTypesCondition::class => 'Payment type restriction',
        // \App\CheckPaymentMethodsCondition::class => 'Payment method restriction',
    ]
];

If you want any conditions to be checked when applying a discount coupon, simply create a class that implements \MohammadMehrabani\ConditionalCoupon\CheckConditionAbstract and add it to the conditional-coupon.php config file along with a title for the condition. No further action is needed—it's that simple.

namespace App;

use App\Models\Order;
use MohammadMehrabani\ConditionalCoupon\CheckConditionAbstract;
use MohammadMehrabani\ConditionalCoupon\Exceptions\CouponException;

class CheckUsageLimitCondition extends CheckConditionAbstract
{
    /**
     * @throws CouponException|\Exception
     */
    public function handle(mixed $payload, \Closure $next): mixed
    {
        $orderCount = Order::where([ // only for example
            'coupon_id' => $this->coupon->id,
            'user_id'   => auth()->id(),
            'status'    => 'fulfilled',
        ])->count();

        if ($orderCount > $this->condition->data) {
            throw new \Exception(__('Coupon user usage limit reached.'), 400);
        }

        return $next($payload);
    }
}

class CheckPaymentTypesCondition extends CheckConditionAbstract
{
    public function handle(mixed $payload, \Closure $next): mixed
    {
        if (empty(array_intersect($this->condition->data, ['cash', 'credit']))) {
            throw new \Exception('payment types do not match.');
        }

        return $next($payload);
    }
}

add to config file:

return [
    'conditions' => [
        \App\CheckUsageLimitCondition::class   => 'Usage limit',
        \App\CheckPaymentTypesCondition::class => 'Payment type restriction',
    ]
];

Usage

Implementing the CRUD for discount coupons—and adding conditions if needed—is up to you. Once created, you can simply use the discount coupon feature for your orders as shown in the example below.

Listing Available Check Classes

You can retrieve all available Check classes using the GetCustomConditions class. Each Check class has a title property which is wrapped in __() for translation. This list can be used to populate the select box when creating discount coupons.

use MohammadMehrabani\ConditionalCoupon\GetCustomConditions;

GetCustomConditions::handle();

create coupon with conditions

use MohammadMehrabani\ConditionalCoupon\Models\Coupon;
use MohammadMehrabani\ConditionalCoupon\Models\CouponCondition;

$coupon = Coupon::create([
    'code' => 'AMZ100',
    // fill other columns
]);

$couponCondition = CouponCondition::create([
    'coupon_id' => $coupon->id,
    'condition' => \App\CheckUsageLimitCondition::class,
    'data' => 1
]);

$couponCondition = CouponCondition::create([
    'coupon_id' => $coupon->id,
    'condition' => \App\CheckPaymentTypesCondition::class,
    'data' => ["credit", "cash"],
]);

create coupon without conditions

use MohammadMehrabani\ConditionalCoupon\Models\Coupon;
use MohammadMehrabani\ConditionalCoupon\Models\CouponCondition;

$coupon = Coupon::create([
    'code' => 'AMZ100',
    // fill other columns
]);

use coupon for order

use Illuminate\Support\Facades\DB;
use App\Models\Order;
use MohammadMehrabani\ConditionalCoupon\InquiryCoupon;

DB::transaction(function () {
    $inquiryCoupon = new InquiryCoupon();
    [
        $currency,
        $amount,
        $discountAmount,
        $payableAmount,
        $coupon
    ] = $inquiryCoupon->handle(code: request()->get('coupon_code'), amount: 1000000, locked: true);
   
   $order = Order::create([ // only for example
        'discount'  => $discountAmount,
        'amount'    => $payableAmount,
        'user_id'   => auth()->id(),
        'status'    => 'initial',
        'coupon_id' => $coupon->id,
        # Other fields as needed:
        // 'coupon_code'         => $coupon->code,
        // 'discount_percentage' => $coupon->discount_percentage,
        // 'discount_amount'     => $coupon->discount_amount,
    ]);
    
    $coupon->increment('used_count');
});

Discount Logic

The package supports two types of discount fields:

• discount_percentage
• discount_amount

Rules

1. Single Field Case

   • If only one of the fields is provided, the discount will be applied based on that field.

2. Both Fields Case

   • If both discount_percentage and discount_amount are provided:
     • The discount value is first calculated from the discount_percentage.
     • If the calculated percentage discount is greater than the fixed discount_amount, then the fixed amount will be applied.
     • If the calculated percentage discount is less than or equal to the fixed discount_amount, then the percentage-based discount will be applied.

Example

• Order total: $200
• discount_percentage: 20%
• discount_amount: $30

Calculation:

• 20% of $200 = $40
• Since $40 (percentage) > $30 (amount), the final discount will be $30.

Testing

composer test

Contributing

Please see CONTRIBUTING for details.

Credits

• Mohammad Hossein Mehrabani
• All Contributors

License

The MIT License (MIT). Please see License File for more information.