<?php

namespace App\Services;

class ToolCallRequestValidator
{
    public function validate(mixed $toolCall): ?array
    {
        if ($toolCall === null || $toolCall === '') {
            return null;
        }

        if (! is_array($toolCall)) {
            return null;
        }

        $action = (string) ($toolCall['action'] ?? '');
        if ($action !== 'domain_inf') {
            return null;
        }

        $parameters = is_array($toolCall['parameters'] ?? null) ? $toolCall['parameters'] : [];
        $sld = trim((string) ($parameters['sld'] ?? ''));
        $tld = trim((string) ($parameters['tld'] ?? ''));

        if ($sld === '' || $tld === '') {
            return null;
        }

        return [
            'action' => $action,
            'parameters' => [
                'sld' => mb_strtolower($sld),
                'tld' => mb_strtolower($tld),
            ],
            'reason' => trim((string) ($toolCall['reason'] ?? '')),
        ];
    }
}