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<?php declare(strict_types=1);
/*
 * This file is part of the php-code-coverage package.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\CodeCoverage\Report;

use SebastianBergmann\CodeCoverage\CodeCoverage;
use SebastianBergmann\CodeCoverage\Node\File;
use SebastianBergmann\CodeCoverage\RuntimeException;

final class Crap4j
{
    /**
     * @var int
     */
    private $threshold;

public function __construct(int $threshold = 30)
    {
        $this->threshold = $threshold;
    }

/**
     * @throws \RuntimeException
     */
    public function process(CodeCoverage $coverage, ?string $target = null, ?string $name = null): string
    {
        $document               = new \DOMDocument('1.0', 'UTF-8');
        $document->formatOutput = true;

$root = $document->createElement('crap_result');
        $document->appendChild($root);

$project = $document->createElement('project', \is_string($name) ? $name : '');
        $root->appendChild($project);
        $root->appendChild($document->createElement('timestamp', \date('Y-m-d H:i:s', $_SERVER['REQUEST_TIME'])));

$stats       = $document->createElement('stats');
        $methodsNode = $document->createElement('methods');

$report = $coverage->getReport();
        unset($coverage);

$fullMethodCount     = 0;
        $fullCrapMethodCount = 0;
        $fullCrapLoad        = 0;
        $fullCrap            = 0;

foreach ($report as $item) {
            $namespace = 'global';

if (!$item instanceof File) {
                continue;
            }

$file = $document->createElement('file');
            $file->setAttribute('name', $item->getPath());

$classes = $item->getClassesAndTraits();

foreach ($classes as $className => $class) {
                foreach ($class['methods'] as $methodName => $method) {
                    $crapLoad = $this->getCrapLoad($method['crap'], $method['ccn'], $method['coverage']);

$fullCrap += $method['crap'];
                    $fullCrapLoad += $crapLoad;
                    $fullMethodCount++;

if ($method['crap'] >= $this->threshold) {
                        $fullCrapMethodCount++;
                    }

$methodNode = $document->createElement('method');

if (!empty($class['package']['namespace'])) {
                        $namespace = $class['package']['namespace'];
                    }

$methodNode->appendChild($document->createElement('package', $namespace));
                    $methodNode->appendChild($document->createElement('className', $className));
                    $methodNode->appendChild($document->createElement('methodName', $methodName));
                    $methodNode->appendChild($document->createElement('methodSignature', \htmlspecialchars($method['signature'])));
                    $methodNode->appendChild($document->createElement('fullMethod', \htmlspecialchars($method['signature'])));
                    $methodNode->appendChild($document->createElement('crap', (string) $this->roundValue($method['crap'])));
                    $methodNode->appendChild($document->createElement('complexity', (string) $method['ccn']));
                    $methodNode->appendChild($document->createElement('coverage', (string) $this->roundValue($method['coverage'])));
                    $methodNode->appendChild($document->createElement('crapLoad', (string) \round($crapLoad)));

$methodsNode->appendChild($methodNode);
                }
            }
        }

$stats->appendChild($document->createElement('name', 'Method Crap Stats'));
        $stats->appendChild($document->createElement('methodCount', (string) $fullMethodCount));
        $stats->appendChild($document->createElement('crapMethodCount', (string) $fullCrapMethodCount));
        $stats->appendChild($document->createElement('crapLoad', (string) \round($fullCrapLoad)));
        $stats->appendChild($document->createElement('totalCrap', (string) $fullCrap));

$crapMethodPercent = 0;

if ($fullMethodCount > 0) {
            $crapMethodPercent = $this->roundValue((100 * $fullCrapMethodCount) / $fullMethodCount);
        }

$stats->appendChild($document->createElement('crapMethodPercent', (string) $crapMethodPercent));

$root->appendChild($stats);
        $root->appendChild($methodsNode);

$buffer = $document->saveXML();

if ($target !== null) {
            if (!$this->createDirectory(\dirname($target))) {
                throw new \RuntimeException(\sprintf('Directory "%s" was not created', \dirname($target)));
            }

if (@\file_put_contents($target, $buffer) === false) {
                throw new RuntimeException(
                    \sprintf(
                        'Could not write to "%s',
                        $target
                    )
                );
            }
        }

return $buffer;
    }

/**
     * @param float $crapValue
     * @param int   $cyclomaticComplexity
     * @param float $coveragePercent
     */
    private function getCrapLoad($crapValue, $cyclomaticComplexity, $coveragePercent): float
    {
        $crapLoad = 0;

if ($crapValue >= $this->threshold) {
            $crapLoad += $cyclomaticComplexity * (1.0 - $coveragePercent / 100);
            $crapLoad += $cyclomaticComplexity / $this->threshold;
        }

return $crapLoad;
    }

/**
     * @param float $value
     */
    private function roundValue($value): float
    {
        return \round($value, 2);
    }

private function createDirectory(string $directory): bool
    {
        return !(!\is_dir($directory) && !@\mkdir($directory, 0777, true) && !\is_dir($directory));
    }
}