pysr

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I tried to do as much as I understood from the Assignment given. I thought it was suitable for me as I have previous experience in crypto.

I start the transactions according to the EUR parity,

#/app/Http/Controllers/Exchange.php
const DEFAULT_CURRENCY = "EUR";

I aggregated transactions by USER ID and did a date comparison in CSV between the previous row and the row I got.

namespace App\Http\Controllers;

    /**
     * Set Transactions by grouped user;
     *
     * @param array $transaction
     * @param string|integer $userID
     *
     * @return array
     */
    public function setTransactions($transaction, $userId)
    {
        $this->transactions[$userId][] = $transaction;
        return $this->transactions[$userId];
    }

I count down from 3 after making sure that the transaction dates start in the same week, from Monday to Sunday. And I only do this for the Withdrawal operations. If two transactions are not in the same week, I start counting again from 3. Thus, users can withdraw money up to 1000.00 EUR 3 times a week for free. I reset the countdown when the rights expire or exceed the 1000.00 Euro limit. and I take commission on withdrawals that occur during that week.

 public function getCountPerWeek($userId, $result)
    {

        $count = self::FREE_OF_CHARGE_COUNT;
        $date = $result['date'];
        if (!isset($this->transactions[$userId])) {
            return $count;
        } else {
            $lastTransaction = $this->getLastTransaction($userId);

            if (!is_null($lastTransaction)) {
                $date = Carbon::parse($date);
                $lastTransactionDate = $lastTransaction['date'];
                $lastTransactionDate =  Carbon::parse($lastTransactionDate);

                if ($date->startOfWeek() == $lastTransactionDate->startOfWeek()) {
                    $count = $lastTransaction['freeOfChargeCount'];
                    if ($lastTransaction['type'] == CommissionRule::WITHDRAW) {
                        $count--;
                    }
                } else {
                    $count =  self::FREE_OF_CHARGE_COUNT;
                }
            } else {
                if ($lastTransaction['type'] == CommissionRule::WITHDRAW) {
                    $count--;
                }
            }
        }

        return $count;
    }

get withdraw comission by account type

enum CommissionRule: String
{
    case DEPOSIT = "deposit";
    case WITHDRAW = "withdraw";

    public function getWitdrawCom(AccountType $accountType): float
    {
        return match ($this) {
            static::WITHDRAW => match ($accountType) {
                AccountType::BUSINESS => 0.5,
                AccountType::PRIVATE => 0.3
            },
            static::DEPOSIT => 0.03
        };
    }
}

I Use 3rd party lib for Money Class

    use Maba\Component\Monetary\MoneyInterface;
    use Maba\Component\Math\BcMath;
    use Maba\Component\Math\Math;

Tech

PHP 8.0^ https://laravel.com/docs/9.x/artisan

Installation

Install the dependencies and devDependencies and start the server.

cd pysr
composer install
php artisan calculate:fee input.csv

for test

./vendor/bin/phpunit

Plugins

Dillinger is currently extended with the following plugins. Instructions on how to use them in your own application are linked below.

Plugin
maba/monetary
laravel/framework

MIT