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StringCalculatorService.php
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StringCalculatorService.php
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<?php
namespace App\Services;
use App\Events\StringWasAdded;
use App\Exceptions\StringCalculatorServiceException;
class StringCalculatorService
{
protected $repository;
private $delimiters;
private $addCalledCount = 0;
/**
* @param string $numbers
* @return int
*/
public function add(string $numbers)
{
$this->updateAddCallingCounter();
return tap($this->getSum($numbers), function ($sum) {
$this->stringWasAdded($sum);
});
}
/**
* @param string $numbers
* @return int
*/
private function getSum(string $numbers): int
{
if (empty($numbers)) {
return 0;
}
if ($this->isMoreThanTwoNumbers($numbers)) {
$numbers = $this->splitNumbers($numbers);
} else {
$numbers = [$numbers];
}
$numbers = $this->getLessThanOneThousandNumbers($numbers);
$this->throwExceptionWhenNumberIsNegative($numbers);
$sum = $this->sum($numbers);
return $sum;
}
/**
* @param array $numbers
* @return int
*/
private function sum(array $numbers): int
{
$sum = 0;
foreach ($numbers as $number) {
$sum += $number;
}
return $sum;
}
/**
* @param string $numbers
* @return bool
*/
private function isMoreThanTwoNumbers(string $numbers): bool
{
$this->delimiters = $this->delimiter($numbers);
return strpos($numbers, $this->delimiters[0]) !== false;
}
/**
* @param string $numbers
* @return array
*/
private function splitNumbers(string $numbers): array
{
if ($this->isDifferentDelimiter($numbers)) {
$numbersSplitByNewLine = explode('\n', $numbers);
$numbers = $numbersSplitByNewLine[1];
}
$numbers = str_replace('\n', ',', $numbers);
foreach ($this->delimiters as $delimiter) {
$numbers = str_replace($delimiter, ',', $numbers);
}
return explode(',', $numbers);
}
/**
* @param string $numbers
* @return bool
*/
private function isDifferentDelimiter(string $numbers): bool
{
return strpos($numbers, '//') !== false;
}
/**
* @param string $numbers
* @return array
*/
private function delimiter(string $numbers): array
{
$delimiters = [','];
if ($this->isDifferentDelimiter($numbers)) {
$numbersSplitByNewLine = explode('\n', $numbers);
$specifyDelimiters = str_replace('//', '', $numbersSplitByNewLine[0]);
preg_match_all('/.*?\[.*?\]/', $specifyDelimiters, $multipleDelimiters);
if (!empty($multipleDelimiters[0])) {
foreach ($multipleDelimiters[0] as $index => $multipleDelimiter) {
$delimiters[$index] = substr($multipleDelimiter, 1, -1);
}
} else {
$delimiters[0] = $specifyDelimiters;
if ($this->isDelimiterSpecifyByBrackets($delimiters[0])) {
$delimiters[0] = [substr($delimiters[0], 1, -1)];
}
}
}
return $delimiters;
}
/**
* @param array $numbers
* @throws \Throwable
*/
private function throwExceptionWhenNumberIsNegative(array $numbers): void
{
$negativeNumbers = [];
foreach ($numbers as $number) {
if ($number < 0) {
$negativeNumbers[] = $number;
}
}
$exceptionMessage = count($negativeNumbers) > 1
? "negatives not allowed : " . join($negativeNumbers, ",")
: "negatives not allowed";
throw_if(
!empty($negativeNumbers),
StringCalculatorServiceException::class,
$exceptionMessage
);
}
/**
* @return int
*/
public function getCalledCount(): int
{
return $this->addCalledCount;
}
private function updateAddCallingCounter(): void
{
$this->addCalledCount++;
}
private function stringWasAdded($sum): void
{
event(new StringWasAdded($sum));
}
/**
* @param array $numbers
* @return array
*/
private function getLessThanOneThousandNumbers(array $numbers): array
{
$numbers = array_filter($numbers, function ($number) {
return $number < 1000;
});
return $numbers;
}
/**
* @param string $delimiter
* @return bool
*/
private function isDelimiterSpecifyByBrackets(string $delimiter): bool
{
return substr($delimiter, 0, 1) === '[' &&
substr($delimiter, -1) === ']';
}
}