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<?php

declare(strict_types=1);

namespace Metadata\Driver;

class FileLocator implements AdvancedFileLocatorInterface, TraceableFileLocatorInterface
{
    /**
     * @var string[]
     */
    private $dirs;

    /**
     * @param string[] $dirs
     */
    public function __construct(array $dirs)
    {
        $this->dirs = $dirs;
    }

    /**
     * @return array<string, bool>
     */
    public function getPossibleFilesForClass(\ReflectionClass $class, string $extension): array
    {
        $possibleFiles = [];
        foreach ($this->dirs as $prefix => $dir) {
            if ('' !== $prefix && 0 !== strpos($class->getNamespaceName(), $prefix)) {
                continue;
            }

            $len = '' === $prefix ? 0 : strlen($prefix) + 1;
            $path = $dir . '/' . str_replace('\\', '.', substr($class->name, $len)) . '.' . $extension;
            $existsPath = file_exists($path);
            $possibleFiles[$path] = $existsPath;
            if ($existsPath) {
                return $possibleFiles;
            }
        }

        return $possibleFiles;
    }

    public function findFileForClass(\ReflectionClass $class, string $extension): ?string
    {
        foreach ($this->getPossibleFilesForClass($class, $extension) as $path => $existsPath) {
            if ($existsPath) {
                return $path;
            }
        }

        return null;
    }

    /**
     * {@inheritDoc}
     */
    public function findAllClasses(string $extension): array
    {
        $classes = [];
        foreach ($this->dirs as $prefix => $dir) {
            /** @var \RecursiveIteratorIterator|\SplFileInfo[] $iterator */
            $iterator = new \RecursiveIteratorIterator(
                new \RecursiveDirectoryIterator($dir),
                \RecursiveIteratorIterator::LEAVES_ONLY
            );
            $nsPrefix = '' !== $prefix ? $prefix . '\\' : '';
            foreach ($iterator as $file) {
                if (($fileName = $file->getBasename('.' . $extension)) === $file->getBasename()) {
                    continue;
                }

                $classes[] = $nsPrefix . str_replace('.', '\\', $fileName);
            }
        }

        return $classes;
    }
}