invoiceninja/app/Http/ValidationRules/Payment/ValidRefundableRequest.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com)
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Http\ValidationRules\Payment;

use App\Libraries\MultiDB;
use App\Models\Credit;
use App\Models\Invoice;
use App\Models\Payment;
use App\Models\User;
use App\Utils\Traits\MakesHash;
use Illuminate\Contracts\Validation\Rule;

/**
 * Class ValidRefundableRequest
 * @package App\Http\ValidationRules\Payment
 */
class ValidRefundableRequest implements Rule
{
    use MakesHash;

    /**
     * @param string $attribute
     * @param mixed $value
     * @return bool
     */
    private $error_msg;


    public function passes($attribute, $value)
    {

        $payment = Payment::whereId($this->decodePrimaryKey(request()->input('id')))->first();


        if(!$payment)
        {
            $this->error_msg = "Unable to retrieve specified payment";
            return false;
        }

        $request_invoices = request()->has('invoices') ? request()->input('invoices') : [];
        $request_credits = request()->has('credits') ? request()->input('credits') : [];

        foreach($request_invoices as $key => $value)
            $request_invoices[$key]['invoice_id'] = $this->decodePrimaryKey($value['invoice_id']);

        foreach($request_credits as $key => $value)
            $request_credits[$key]['credit_id'] = $this->decodePrimaryKey($value['credit_id']);


        if($payment->invoices()->exists())
        {
            foreach($payment->invoices as $paymentable_invoice)
                $this->checkInvoice($paymentable_invoice, $request_invoices);
        }


        if($payment->credits()->exists())
        {
            foreach($payment->credits as $paymentable_credit)
                $this->paymentable_type($paymentable_credit, $request_credits);
        }


        foreach($request_invoices as $request_invoice)
            $this->checkInvoiceIsPaymentable($request_invoice, $payment);


        foreach($request_credits as $request_credit)
            $this->checkCreditIsPaymentable($request_credit, $payment);


        if(strlen($this->error_msg) > 0 )
            return false;

        return true;
    }

    private function checkInvoiceIsPaymentable($invoice, $payment)
    {
        $invoice = Invoice::find($invoice['invoice_id']);

        if($payment->invoices()->exists())
        {

            $paymentable_invoice = $payment->invoices->where('id', $invoice->id)->first();

            if(!$paymentable_invoice){
                $this->error_msg = "Invoice id ".$invoice->hashed_id." is not related to this payment";
                return false;
            }

        }
        else
        {
            $this->error_msg = "Invoice id ".$invoice->hashed_id." is not related to this payment";
            return false;
        }
    }

    private function checkCreditIsPaymentable($credit, $payment)
    {
        $credit = Credit::find($credit['credit_id']);

        if($payment->credits()->exists())
        {

            $paymentable_credit = $payment->credits->where('id', $credit->id)->first();

            if(!$paymentable_invoice){
                $this->error_msg = "Credit id ".$credit->hashed_id." is not related to this payment";
                return false;
            }

        }
        else
        {
            $this->error_msg = "Credit id ".$credit->hashed_id." is not related to this payment";
            return false;
        }     
    }

    private function checkInvoice($paymentable, $request_invoices)
    {
        $record_found = false;

        foreach($request_invoices as $request_invoice)
        {
            if($request_invoice['invoice_id'] == $paymentable->pivot->paymentable_id)
            {
                $record_found = true;

                $refundable_amount = ($paymentable->pivot->amount - $paymentable->pivot->refunded);

                if($request_invoice['amount'] > $refundable_amount){
                    
                    $invoice = $paymentable->paymentable;

                    $this->error_msg = "Attempting to refund more than allowed for invoice ".$invoice->number.", maximum refundable amount is ". $refundable_amount;
                    return false;
                }

            }

        }

        if(!$record_found)
        {
            $this->error_msg = "Attempting to refund a payment with invoices attached, please specify valid invoice/s to be refunded.";
            return false;
        }


    }


    private function checkCredit($paymentable, $request_credits)
    {
        $record_found = null;

        foreach($request_credits as $request_credit)
        {
            if($request_credit['invoice_id'] == $paymentable->pivot->paymentable_id)
            {

                $record_found = true;

                $refundable_amount = ($paymentable->pivot->amount - $paymentable->pivot->refunded);

                if($request_invoice['amount'] > $refundable_amount){
                    
                    $credit = $paymentable->paymentable;

                    $this->error_msg = "Attempting to refund more than allowed for credit ".$credit->number.", maximum refundable amount is ". $refundable_amount;        
                    return false;
                }

            }

        }

        if(!$record_found)
        {
            $this->error_msg = "Attempting to refund a payment with credits attached, please specify valid credit/s to be refunded.";
            return false;
        }

    }

    /**
     * @return string
     */
    public function message()
    {
        return $this->error_msg;
    }

}