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Edit File: CouponService.php

<?php
namespace App\Services;

use App\Models\Coupon;

class CouponService
{

public static function enquiryCoupon(array $data)
    {
        $coupon = Coupon::where('code',$data['coupon'])->where('end_at','>',date('y-m-d'))->where('num_to_use','>',0)->first();
        if(!$coupon){
            return false;
        }

if($coupon->code !== $data['coupon']){
            return false;
        }
        $discount = 0;
        if($coupon->type == 'amount'){
            $discount = $coupon->value;
        }else{
            $discount = ($coupon->value/100) * $data['delivery_price'];
        }
        if($discount > $data['delivery_price']){
           $discount =  $data['delivery_price'];
        }
        return $discount;
    }

public static function useCoupon(array $data)
    {
        $coupon = Coupon::where('code',$data['coupon'])->where('end_at','>',date('y-m-d'))->where('num_to_use','>',0)->first();
        if($coupon){
            $coupon->num_to_use -=1;
            $coupon->num_used += 1;
            $coupon->update();
        }
        return true;
    }

}

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