CurrencyConverterHelper::_getRateFromDatabase() - Code Metrics - Inspection of "Refactoring, Add Helper, change convert method par..." - AlessandroMinoccheri/cakephp-currency-converter - Measure and Improve Code Quality continuously with Scrutinizer

Passed
Pull Request — master (#14)

unknown
created 2018-11-01 19:32 UTC
CurrencyConverterHelper::_getRateFromDatabase() A

↳ Parent: CurrencyConverterHelper
Complexity

Conditions	5
Paths	5
Size

Total Lines	28
Code Lines	20
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	23
CRAP Score	5
Importance

Changes
Metric	Value
cc	5
eloc	20
nc	5
nop	2
dl	0
loc	28
ccs	23
cts	23
cp	1
crap	5
rs	9.2888
c	0
b	0
f	0
<?php
namespace CurrencyConverter\View\Helper;

use Cake\View\Helper;
use Cake\ORM\TableRegistry;
use Cake\I18n\Time;

/**
 * @property \Cake\View\Helper\HtmlHelper $Html
 * @property \Cake\View\Helper\FormHelper $Form
 * @property \Cake\View\Helper\NumberHelper $Number
 */
class CurrencyConverterHelper extends Helper
{
    /**
     * Using database
     *
     * @var bool
     */
    private $database;

    /**
     * Time interval for refreshing database
     *
     * @var int
     */
    private $refresh;

    /**
     * Number of decimal to use for formatting converted price
     *
     * @var int
     */
    private $decimal;

    /**
     * Number to divise 1 and get the sup step to round price to
     *
     * @var float
     */
    private $round;

    /**
     * Session
     *
     * @var \Cake\Http\Session
     */
    private $session;

    /**
     * CurrencyratesTable Class
     * @var \Cake\ORM\Table
     */
    private $currencyratesTable;

    /**
     * Default CurrencyConverterComponent settings.
     *
     * When calling CurrencyConverterComponent() these settings will be merged with the configuration
     * you provide.
     *
     * - `database` - Mention if Component have to store currency rate in database
     * - `refresh` - Time interval for Component to refresh currency rate in database
     * - `decimal` - Number of decimal to use when formatting amount float number
     * - `round` - Number to divise 1 and get the sup step to round price to (eg: 4 for 0.25 step)
     *
     * @var array
     */
    protected $_defaultConfig = [
        'database' => true, // Mention if Component have to store currency rate in database
        'refresh' => 24, // Time interval for Component to refresh currency rate in database
        'decimal' => 2, // Number of decimal to use when formatting amount float number
        'round' => false, // Number to divise 1 and get the sup step to round price to (eg: 4 for 0.25 step)
    ];

    /**
     * @param array $config
     * @return void
     */
    public function initialize(array $config = []) {
        $config = $this->getConfig();

        $this->database = $config['database'];
        $this->refresh = $config['refresh'];
        $this->decimal = $config['decimal'];
        $this->round = $config['round'];
        if ($this->round == 0) {
            $this->round = false;
$answer = 42;

$correct = false;

$correct = (bool) $answer;
        }
        $this->session = $this->request->getSession();
        $this->currencyratesTable = TableRegistry::get('CurrencyConverter.Currencyrates');
        $this->currencyratesTable = /** @scrutinizer ignore-deprecated */ TableRegistry::get('CurrencyConverter.Currencyrates');
    }

    /**
     * Convert method take an amount as first parameter and convert it using $from currency and $to currency.
     *
     * @param float|string $amount the amount to convert.
     * @param string $from currency to convert from
     * @param string $to currency to convert to
     * @return string $amount converted
     */
    public function convert($amount, $from, $to)
    {
        $amount = floatval($amount);
        $rate = $this->_getRateToUse($from, $to);

        return $convert = $this->_formatConvert($rate * $amount);

    }

    /**
     * Rate method return the rate of two currencies
     *
     * @param string $from currency to get the rate from
     * @param string $to currency to get the rate to
     * @return float|null $rate
     */
    public function rate($from, $to)
    {
        return $this->_getRateToUse($from, $to);
    }

    /**
     * getRateToUse return rate to use
     * Using $from and $to parameters representing currency to deal with and the configuration settings
     * This method save or update currencyrates Table if necesseray too.
     *
     * @param string $from currency to get the rate from
     * @param string $to currency to get the rate to
     * @return float|null $rate
     */
    private function _getRateToUse($from, $to)
    {
        $rate = 1;
        if ($from !== $to) {
            if ($this->database) {
                $rate = $this->_getRateFromSession($from, $to);
                if (!$rate) {
                    $rate = $this->_getRateFromDatabase($from, $to);
                }
            } else {
                $rate = $this->_getRateFromAPI($from, $to);
class A
{
    function getObject()
    {
        return null;
    }

}

$a = new A();
$object = $a->getObject();
            }
        }

        return $rate;
    }

    /**
     * Format number using configuration
     *
     * @param float number to format
     * @return string formatted number
     */
    private function _formatConvert($number)
    {
        if ($this->round) {
            $n = floor($number);
            $fraction = ($number - $n);
            if ($fraction != 0) {
                $step = 1/$this->round;
                $decimal = (((int)($fraction/$step) + 1) * $step);
                $number = $n + $decimal;
            }
        }
        $number = number_format($number, $this->decimal);

        return number_format($number, $this->decimal);
        return number_format(/** @scrutinizer ignore-type */ $number, $this->decimal);
    }

    /**
     * Check session to see if rate exists in.
     * 
     * @param  string $from currency to get the rate from.
     * @param  string $to currency to get the rate to.
     * @return float|null $rate.
     */
    private function _getRateFromSession($from, $to)
    {
        $session = $this->session->read('CurrencyConverter.' . $from . '-' . $to);        
        if ($session) {
            $modified = new Time($session['modified']);
            if ($modified->wasWithinLast($this->refresh . ' hours')) {
                return $rate = $session['rate'];

            }
        }

        return null;
    }

    /**
     * Get a rate from database.
     *
     * It queries currencyratesTable and ...
     * if rate exists and has not to be modified, it returns this rate.
     * if rate exists and has to be modified, it call _getRateFromAPI method to get a fresh rate, then update in table and store in session this rate.
     * if rate does not exist, it call _getRateFromAPI to get a fresh rate, then create in table and store this rate.
     * 
     * @param  string $from currency to get the rate from
     * @param  string $to currency to get the rate to
     * @return float|null $rate
     */
    private function _getRateFromDatabase($from, $to)
    {
        $result = $this->currencyratesTable->find('all')->where(['from_currency' => $from, 'to_currency' => $to])->first();
        if ($result) {
            if ($result->get('modified')->wasWithinLast($this->refresh . ' hours')) {
                $rate = $result->get('rate');
            } else {
                $rate = $this->_getRateFromAPI($from, $to);
class A
{
    function getObject()
    {
        return null;
    }

}

$a = new A();
$object = $a->getObject();
                if ($rate) {

                    $result->rate = $rate;
                    $this->currencyratesTable->save($result);
                    $this->_storeRateInSession($result);
                }
            }
        } else {
            $rate = $this->_getRateFromAPI($from, $to);
class A
{
    function getObject()
    {
        return null;
    }

}

$a = new A();
$object = $a->getObject();
            if ($rate) {

                $result = $this->currencyratesTable->newEntity([
                    'from_currency' => $from,
                    'to_currency' => $to,
                    'rate' => $rate
                ]);
                $this->currencyratesTable->save($result);
                $this->_storeRateInSession($result);
            }
        }

        return $rate;
    }

    /**
     * Store in session a rate and his modified datetime
     * 
     * @param  \Cake\ORM\Entity $entity
     * @return void
     */
    private function _storeRateInSession($entity)
    {
        $this->session->write('CurrencyConverter', [
            $entity->get('from_currency') . '-' . $entity->get('to_currency') => [
                'rate' => $entity->get('rate'),
                'modified' => $entity->get('modified')
            ]
        ]);
    }

    /**
     * Call free.currencyconverterapi.com API to get a rate for one currency to an other one currency.
     *
     * @param string $from the currency.
     * @param string $to the currency.
     * @return int|null $rate.
     */
    private function _getRateFromAPI($from, $to)
    {
        $rate = null;

        $url = 'https://free.currencyconverterapi.com/api/v5/convert?q=' . $from . '_' . $to . '&compact=ultra';
        $request = @fopen($url, 'r');
        if ($request) {

            $response = fgets($request, 4096);
            fclose($request);
            $response = json_decode($response, true);
            if (isset($response[$from . '_' . $to])) {
                $rate = $response[$from . '_' . $to];
            }
        }
        
        return $rate;
    }
}

AlessandroMinoccheri / cakephp-currency-converter

Pull Request — master (#14)

CurrencyConverterHelper::_getRateFromDatabase() A

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