invoiceninja/app/Repositories/PaymentRepository.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\Repositories;

use App\Events\Payment\PaymentWasCreated;
use App\Factory\CreditFactory;
use App\Jobs\Credit\ApplyCreditPayment;
use App\Libraries\Currency\Conversion\CurrencyApi;
use App\Models\Client;
use App\Models\Credit;
use App\Models\Invoice;
use App\Models\Payment;
use App\Repositories\CreditRepository;
use App\Utils\Traits\MakesHash;
use Illuminate\Http\Request;
use Illuminate\Support\Carbon;

/**
 * PaymentRepository
 */
class PaymentRepository extends BaseRepository
{
    use MakesHash;

    protected $credit_repo;

    public function __construct(CreditRepository $credit_repo)
    {
        $this->credit_repo = $credit_repo;
    }

    public function getClassName()
    {
        return Payment::class;
    }

    /**
     * Saves and updates a payment. //todo refactor to handle refunds and payments.
     *
     * @param array $data the request object
     * @param Payment $payment The Payment object
     * @return Payment|null Payment $payment
     */
    public function save(array $data, Payment $payment): ?Payment
    {
        if ($payment->amount >= 0) {
            return $this->applyPayment($data, $payment);
        }

        return $payment;
    }

    /**
     * Handles a positive payment request
     * @param  array $data      The data object
     * @param  Payment $payment The $payment entity
     * @return Payment          The updated/created payment object
     */
    private function applyPayment(array $data, Payment $payment): ?Payment
    {

        //check currencies here and fill the exchange rate data if necessary
        if (!$payment->id) {
            $this->processExchangeRates($data, $payment);

            /*We only update the paid to date ONCE per payment*/
            if (array_key_exists('invoices', $data) && is_array($data['invoices']) && count($data['invoices']) > 0) {

                if($data['amount'] == '')
                    $data['amount'] = array_sum(array_column($data['invoices'], 'amount'));
                
                $client = Client::find($data['client_id']);
                $client->service()->updatePaidToDate($data['amount'])->save();

            }
        }

        /*Fill the payment*/
        $payment->fill($data);
        $payment->status_id = Payment::STATUS_COMPLETED;
        $payment->save();


        /*Ensure payment number generated*/
        if (!$payment->number || strlen($payment->number) == 0) {
            $payment->number = $payment->client->getNextPaymentNumber($payment->client);
        }

        $invoice_totals = 0;
        $credit_totals = 0;

        /*Iterate through invoices and apply payments*/
        if (array_key_exists('invoices', $data) && is_array($data['invoices']) && count($data['invoices']) > 0) {
            $invoice_totals = array_sum(array_column($data['invoices'], 'amount'));

            $invoices = Invoice::whereIn('id', array_column($data['invoices'], 'invoice_id'))->get();

            $payment->invoices()->saveMany($invoices);

            info("iterating through payment invoices");

            foreach ($data['invoices'] as $paid_invoice) {

                $invoice = Invoice::whereId($paid_invoice['invoice_id'])->with('client')->first();

                info("current client balance = {$invoice->client->balance}");

                if ($invoice) {
                
                    info("apply payment amount {$paid_invoice['amount']}");
                    
                    $invoice = $invoice->service()->markSent()->applyPayment($payment, $paid_invoice['amount'])->save();

                    info("after processing invoice the client balance is now {$invoice->client->balance}");

                }

                
            }
        } else {
            //payment is made, but not to any invoice, therefore we are applying the payment to the clients paid_to_date only
            $payment->client->service()->updatePaidToDate($payment->amount)->save(); 
        }

        if (array_key_exists('credits', $data) && is_array($data['credits'])) {
            $credit_totals = array_sum(array_column($data['credits'], 'amount'));

            $credits = Credit::whereIn('id', $this->transformKeys(array_column($data['credits'], 'credit_id')))->get();
            $payment->credits()->saveMany($credits);

            foreach ($data['credits'] as $paid_credit) {
                $credit = Credit::find($this->decodePrimaryKey($paid_credit['credit_id']));

                if ($credit) {
                    ApplyCreditPayment::dispatchNow($credit, $payment, $paid_credit['amount'], $credit->company);
                }
            }
        }

        event(new PaymentWasCreated($payment, $payment->company));

        $invoice_totals -= $credit_totals;

        //$payment->amount = $invoice_totals; //creates problems when setting amount like this.
        if($credit_totals == $payment->amount){
            $payment->applied += $credit_totals;
        } elseif ($invoice_totals == $payment->amount) {
            $payment->applied += $payment->amount;
        } elseif ($invoice_totals < $payment->amount) {
            $payment->applied += $invoice_totals;
        }

        $payment->save();

        return $payment->fresh();
    }


    /**
     * If the client is paying in a currency other than
     * the company currency, we need to set a record
     */
    private function processExchangeRates($data, $payment)
    {

        $client = Client::find($data['client_id']);

        $client_currency = $client->getSetting('currency_id');
        $company_currency = $client->company->settings->currency_id;

        if ($company_currency != $client_currency) {
            $currency = $client->currency();

            $exchange_rate = new CurrencyApi();

            $payment->exchange_rate = $exchange_rate->exchangeRate($client_currency, $company_currency, Carbon::parse($payment->date));
            $payment->exchange_currency_id = $client_currency;
        }

        return $payment;
    }
}