<?php
namespace MazlanHalim\IntelliLanz\Graph;

final class Node implements \JsonSerializable {
    private array $data;

    public function __construct( string $id, string $type, string $category, string $label, string $status = 'unknown', int $severity = 0, array $metadata = array() ) {
        foreach ( array( $id, $type, $category, $label ) as $value ) {
            if ( trim( $value ) === '' ) {
                throw new \InvalidArgumentException( 'Node identity fields must not be empty.' );
            }
        }
        if ( ! in_array( $status, array( 'healthy', 'info', 'warning', 'critical', 'inactive', 'unknown' ), true ) || $severity < 0 || $severity > 3 ) {
            throw new \InvalidArgumentException( 'Invalid node status or severity.' );
        }
        // Detectors must supply only allowlisted, non-secret operational metadata.
        $this->data = compact( 'id', 'type', 'category', 'label', 'status', 'severity', 'metadata' );
    }

    public function getId(): string {
        return $this->data['id'];
    }

    public function jsonSerialize(): array {
        $data = $this->data;
        $data['metadata'] = (object) $data['metadata'];
        return $data;
    }
}