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<?php |
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namespace CurrencyConverter\Controller\Component; |
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use Cake\Controller\Component; |
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use Cake\Datasource\ConnectionManager; |
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use Cake\ORM\TableRegistry; |
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use Cake\Database\Schema\TableSchema; |
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class CurrencyConverterComponent extends Component |
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{ |
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private $fromCurrency; |
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private $toCurrency; |
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private $amount; |
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private $hourDifference; |
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private $saveIntoDb; |
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private $dataSource; |
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private $rate; |
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private $currencyTable; |
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/** |
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* Convertion function |
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* |
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* @param string $fromCurrency the starting currency that user wants to convert to. |
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* @param string $toCurrency the ending currency that user wants to convert to. |
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* @param float $amount the amount to convert. |
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* @param boolean $saveIntoDb if develop wants to store convertion rate for use it without resending data to yahoo service. |
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* @param int $hourDifference the hour difference to check if the last convertion is passed, if yes make a new call to yahoo finance api. |
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* @param string $dataSource which dataSOurce need to use |
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* @return float the total amount converted into the new currency |
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*/ |
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public function convert( |
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$fromCurrency, |
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$toCurrency, |
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$amount, |
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$saveIntoDb = true, |
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$hourDifference = 1, |
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$dataSource = 'default' |
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) { |
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$this->fromCurrency = $fromCurrency; |
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$this->toCurrency = $toCurrency; |
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$this->amount = $amount; |
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$this->saveIntoDb = (bool)$saveIntoDb; |
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$this->hourDifference = $hourDifference; |
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$this->dataSource = $dataSource; |
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$this->rate = 0; |
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if ($this->fromCurrency != $this->toCurrency) { |
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$this->fixFromToCurrency(); |
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if ($this->saveIntoDb === true) { |
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$this->currencyTable = TableRegistry::get('CurrencyConverter', [ |
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'className' => 'CurrencyConverter\Model\Table\CurrencyConvertersTable', |
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'table' => 'currency_converter' |
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]); |
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$this->ensureIfExistTable(); |
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$this->saveIntoDatabase(); |
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return $this->calculateValue(); |
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} |
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$this->rate = $this->getRates(); |
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return $this->calculateValue(); |
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} |
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return number_format((double)$this->amount, 2, '.', ''); |
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} |
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private function fixFromToCurrency() |
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{ |
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if ($this->fromCurrency == "PDS"){ |
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$this->fromCurrency = "GBP"; |
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} |
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if ($this->toCurrency == "PDS"){ |
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$this->toCurrency = "GBP"; |
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} |
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} |
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private function saveIntoDatabase() |
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{ |
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$query = $this->currencyTable->find('all') |
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->where(['fromCurrency' => $this->fromCurrency, 'toCurrency' => $this->toCurrency ]); |
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$query->enableHydration(false); |
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$result = $query->toArray(); |
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foreach ($result as $row){ |
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$lastUpdated = $row['modified']; |
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$now = date('Y-m-d H:i:s'); |
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$dStart = new \DateTime($now); |
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$diff = $dStart->diff($lastUpdated); |
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if ($this->ensureNeedToUpdateDatabase($diff, $row)) { |
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$this->updateDatabase($row); |
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} else { |
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$this->rate = $row['rates']; |
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} |
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} |
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if (count($result) <= 0) { |
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$this->insertIntoDatabase(); |
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} |
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} |
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private function updateDatabase($row) |
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{ |
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$this->rate = $this->getRates(); |
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$data = [ |
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'fromCurrency'=> $this->fromCurrency, |
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'toCurrency' => $this->toCurrency, |
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'rates' => $this->rate, |
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'modified' => date('Y-m-d H:i:s'), |
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]; |
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$entity = $this->currencyTable->get($row['id']); |
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$this->currencyTable->patchEntity($entity, $data); |
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$this->currencyTable->save($entity); |
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} |
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private function insertIntoDatabase() |
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{ |
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$this->rate = $this->getRates(); |
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$data = [ |
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'fromCurrency' => $this->fromCurrency, |
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'toCurrency' => $this->toCurrency, |
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'rates' => $this->rate, |
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'created' => date('Y-m-d H:i:s'), |
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'modified' => date('Y-m-d H:i:s'), |
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]; |
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$entity = $this->currencyTable->newEntity($data); |
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$this->currencyTable->save($entity); |
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} |
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private function ensureNeedToUpdateDatabase($diff, $row) |
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{ |
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return ( |
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((int)$diff->y >= 1) || |
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((int)$diff->m >= 1) || |
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((int)$diff->d >= 1) || |
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((int)$diff->h >= $this->hourDifference) || |
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((double)$row['rates'] == 0) |
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); |
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} |
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private function getRates() |
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{ |
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$url = 'http://api.fixer.io/latest?base=' . $this->fromCurrency . '&symbols=' . $this->toCurrency; |
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$handle = @fopen($url, 'r'); |
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if ($handle) { |
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$result = fgets($handle, 4096); |
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fclose($handle); |
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} |
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if (isset($result)) { |
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$conversion = json_decode($result, true); |
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if (isset($conversion['rates'][$this->toCurrency])) { |
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return $conversion['rates'][$this->toCurrency]; |
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} |
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} |
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return $this->rate = 0; |
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} |
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private function ensureIfExistTable() |
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{ |
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$autoIncrement = 'AUTO_INCREMENT'; |
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$db = ConnectionManager::get($this->dataSource); |
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$config = $db->config(); |
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if (strpos($config['dsn'], 'sqlite') !== false) { |
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$autoIncrement = 'AUTOINCREMENT'; |
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} |
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$sql = 'CREATE TABLE IF NOT EXISTS `currency_converters` ( |
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`id` integer PRIMARY KEY ' . $autoIncrement . ', |
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`fromCurrency` varchar(5) NOT NULL, |
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`toCurrency` varchar(5) NOT NULL, |
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`rates` varchar(10) NOT NULL, |
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`created` datetime NOT NULL, |
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`modified` datetime NOT NULL |
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);'; |
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return $db->query($sql); |
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} |
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private function calculateValue() |
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{ |
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$value = (double)$this->rate * (double)$this->amount; |
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return number_format((double)$value, 2, '.', ''); |
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} |
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} |
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AlessandroMinoccheri /
cakephp-currency-converter
