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<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (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 PHPUnit\Runner;

use const DIRECTORY_SEPARATOR;
use function assert;
use function defined;
use function dirname;
use function file_get_contents;
use function file_put_contents;
use function in_array;
use function is_dir;
use function is_file;
use function is_float;
use function is_int;
use function is_string;
use function serialize;
use function sprintf;
use function unserialize;
use PHPUnit\Util\ErrorHandler;
use PHPUnit\Util\Filesystem;
use Serializable;

/**
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class DefaultTestResultCache implements Serializable, TestResultCache
{
    /**
     * @var string
     */
    public const DEFAULT_RESULT_CACHE_FILENAME = '.phpunit.result.cache';

/**
     * Provide extra protection against incomplete or corrupt caches.
     *
     * @var int[]
     */
    private const ALLOWED_CACHE_TEST_STATUSES = [
        BaseTestRunner::STATUS_SKIPPED,
        BaseTestRunner::STATUS_INCOMPLETE,
        BaseTestRunner::STATUS_FAILURE,
        BaseTestRunner::STATUS_ERROR,
        BaseTestRunner::STATUS_RISKY,
        BaseTestRunner::STATUS_WARNING,
    ];

/**
     * Path and filename for result cache file.
     *
     * @var string
     */
    private $cacheFilename;

/**
     * The list of defective tests.
     *
     * <code>
     * // Mark a test skipped
     * $this->defects[$testName] = BaseTestRunner::TEST_SKIPPED;
     * </code>
     *
     * @var array<string, int>
     */
    private $defects = [];

/**
     * The list of execution duration of suites and tests (in seconds).
     *
     * <code>
     * // Record running time for test
     * $this->times[$testName] = 1.234;
     * </code>
     *
     * @var array<string, float>
     */
    private $times = [];

public function __construct(?string $filepath = null)
    {
        if ($filepath !== null && is_dir($filepath)) {
            // cache path provided, use default cache filename in that location
            $filepath .= DIRECTORY_SEPARATOR . self::DEFAULT_RESULT_CACHE_FILENAME;
        }

$this->cacheFilename = $filepath ?? $_ENV['PHPUNIT_RESULT_CACHE'] ?? self::DEFAULT_RESULT_CACHE_FILENAME;
    }

/**
     * @throws Exception
     */
    public function persist(): void
    {
        $this->saveToFile();
    }

/**
     * @throws Exception
     */
    public function saveToFile(): void
    {
        if (defined('PHPUNIT_TESTSUITE_RESULTCACHE')) {
            return;
        }

if (!Filesystem::createDirectory(dirname($this->cacheFilename))) {
            throw new Exception(
                sprintf(
                    'Cannot create directory "%s" for result cache file',
                    $this->cacheFilename
                )
            );
        }

file_put_contents(
            $this->cacheFilename,
            serialize($this)
        );
    }

public function setState(string $testName, int $state): void
    {
        if ($state !== BaseTestRunner::STATUS_PASSED) {
            $this->defects[$testName] = $state;
        }
    }

public function getState(string $testName): int
    {
        return $this->defects[$testName] ?? BaseTestRunner::STATUS_UNKNOWN;
    }

public function setTime(string $testName, float $time): void
    {
        $this->times[$testName] = $time;
    }

public function getTime(string $testName): float
    {
        return $this->times[$testName] ?? 0.0;
    }

public function load(): void
    {
        $this->clear();

if (!is_file($this->cacheFilename)) {
            return;
        }

$cacheData = @file_get_contents($this->cacheFilename);

// @codeCoverageIgnoreStart
        if ($cacheData === false) {
            return;
        }
        // @codeCoverageIgnoreEnd

$cache = ErrorHandler::invokeIgnoringWarnings(
            static function () use ($cacheData) {
                return @unserialize($cacheData, ['allowed_classes' => [self::class]]);
            }
        );

if ($cache === false) {
            return;
        }

if ($cache instanceof self) {
            /* @var DefaultTestResultCache $cache */
            $cache->copyStateToCache($this);
        }
    }

public function copyStateToCache(self $targetCache): void
    {
        foreach ($this->defects as $name => $state) {
            $targetCache->setState($name, $state);
        }

foreach ($this->times as $name => $time) {
            $targetCache->setTime($name, $time);
        }
    }

public function clear(): void
    {
        $this->defects = [];
        $this->times   = [];
    }

public function serialize(): string
    {
        return serialize([
            'defects' => $this->defects,
            'times'   => $this->times,
        ]);
    }

/**
     * @param string $serialized
     */
    public function unserialize($serialized): void
    {
        $data = unserialize($serialized);

if (isset($data['times'])) {
            foreach ($data['times'] as $testName => $testTime) {
                assert(is_string($testName));
                assert(is_float($testTime));
                $this->times[$testName] = $testTime;
            }
        }

if (isset($data['defects'])) {
            foreach ($data['defects'] as $testName => $testResult) {
                assert(is_string($testName));
                assert(is_int($testResult));

if (in_array($testResult, self::ALLOWED_CACHE_TEST_STATUSES, true)) {
                    $this->defects[$testName] = $testResult;
                }
            }
        }
    }
}