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<?php
namespace Digitigrade\StorageProvider;

use Digitigrade\StorageProvider;

class FilesystemStorage extends StorageProvider {
    private const BASE_PATH = __DIR__ . '/../../upload/';

    private static function tokenToPath(string $token): string {
        return self::BASE_PATH . $token;
    }

    protected function storeFileInternal(string $path): ?string {
        $token = hash_file('sha256', $path);
        rename($path, self::tokenToPath($token));
        return $token;
    }

    public function exists(string $token): bool {
        return is_file(self::tokenToPath($token));
    }

    public function retrieve(string $token): ?string {
        $path = self::tokenToPath($token);
        if (!is_readable($path)) {
            return null;
        }
        return file_get_contents($path);
    }

    public function directUrl(string $token): ?string {
        return path_to_uri("/upload/$token");
    }

    public function passthrough(string $token, ?string $mimetype = null) {
        if (!$this->exists($token)) {
            throw new \RuntimeException('requested object does not exist');
        }
        $path = self::tokenToPath($token);
        if (!headers_sent()) {
            header('Content-Type: ' . ($mimetype ?? (mime_content_type($path) ?: 'application/octet-stream')));
        }
        readfile($path);
    }

    public function delete(string $token) {
        $path = self::tokenToPath($token);
        if (is_file($path)) {
            unlink($path);
        }
    }
}