class DefaultResultCache

final class DefaultResultCache implements ResultCache {
    
    /**
     * @var int
     */
    private const VERSION = 1;
    
    /**
     * @var string
     */
    private const DEFAULT_RESULT_CACHE_FILENAME = '.phpunit.result.cache';
    private readonly string $cacheFilename;
    
    /**
     * @psalm-var array<string, TestStatus>
     */
    private array $defects = [];
    
    /**
     * @psalm-var array<string, float>
     */
    private array $times = [];
    public function __construct(?string $filepath = null) {
        if ($filepath !== null && is_dir($filepath)) {
            $filepath .= DIRECTORY_SEPARATOR . self::DEFAULT_RESULT_CACHE_FILENAME;
        }
        $this->cacheFilename = $filepath ?? $_ENV['PHPUNIT_RESULT_CACHE'] ?? self::DEFAULT_RESULT_CACHE_FILENAME;
    }
    public function setStatus(string $id, TestStatus $status) : void {
        if ($status->isSuccess()) {
            return;
        }
        $this->defects[$id] = $status;
    }
    public function status(string $id) : TestStatus {
        return $this->defects[$id] ?? TestStatus::unknown();
    }
    public function setTime(string $id, float $time) : void {
        $this->times[$id] = $time;
    }
    public function time(string $id) : float {
        return $this->times[$id] ?? 0.0;
    }
    public function load() : void {
        if (!is_file($this->cacheFilename)) {
            return;
        }
        $contents = file_get_contents($this->cacheFilename);
        if ($contents === false) {
            return;
        }
        $data = json_decode($contents, true);
        if ($data === null) {
            return;
        }
        if (!isset($data['version'])) {
            return;
        }
        if ($data['version'] !== self::VERSION) {
            return;
        }
        assert(isset($data['defects']) && is_array($data['defects']));
        assert(isset($data['times']) && is_array($data['times']));
        foreach (array_keys($data['defects']) as $test) {
            $data['defects'][$test] = TestStatus::from($data['defects'][$test]);
        }
        $this->defects = $data['defects'];
        $this->times = $data['times'];
    }
    
    /**
     * @throws Exception
     */
    public function persist() : void {
        if (!Filesystem::createDirectory(dirname($this->cacheFilename))) {
            throw new DirectoryDoesNotExistException(dirname($this->cacheFilename));
        }
        $data = [
            'version' => self::VERSION,
            'defects' => [],
            'times' => $this->times,
        ];
        foreach ($this->defects as $test => $status) {
            $data['defects'][$test] = $status->asInt();
        }
        file_put_contents($this->cacheFilename, json_encode($data), LOCK_EX);
    }

}