<?php

declare(strict_types=1);

namespace KTXC\Service;

use KTXC\Stores\FirewallStore;

final class FirewallStatusService
{
    public function __construct(private readonly FirewallStore $store)
    {
    }

    public function tenantMetrics(string $tenantId, ?string $since = null): array
    {
        $sinceDate = self::date($since);
        return [
            'tenantId' => $tenantId,
            'blockedRequests' => $this->store->countBlockedRequests($tenantId, $sinceDate),
            'since' => $sinceDate?->format(\DateTimeInterface::ATOM),
        ];
    }

    public function systemMetrics(?string $tenantId = null, ?string $since = null): array
    {
        if ($tenantId !== null && ($tenantId === '' || strlen($tenantId) > 128)) {
            throw new \InvalidArgumentException('Invalid tenant filter.');
        }
        $sinceDate = self::date($since);
        return [
            'tenantId' => $tenantId,
            'blockedRequests' => $this->store->countSystemBlockedRequests($tenantId, $sinceDate),
            'since' => $sinceDate?->format(\DateTimeInterface::ATOM),
        ];
    }

    public function maintenanceStatus(): array
    {
        return $this->store->maintenanceStatus() ?? [
            'status' => 'never_run',
            'startedAt' => null,
            'completedAt' => null,
            'result' => null,
            'error' => null,
        ];
    }

    private static function date(?string $value): ?\DateTimeImmutable
    {
        if ($value === null) {
            return null;
        }
        if ($value === '' || strlen($value) > 255) {
            throw new \InvalidArgumentException('Invalid since date filter.');
        }
        try {
            return new \DateTimeImmutable($value);
        } catch (\Exception) {
            throw new \InvalidArgumentException('Invalid since date filter.');
        }
    }
}