<?php

namespace App\Services\Hardening;

use App\Contracts\Hardening\WriteGateInterface;
use App\Exceptions\Hardening\ProviderAccessHardeningRequired;
use App\Models\ManagedEnvironment;
use Illuminate\Support\Facades\Log;

class IntuneRbacWriteGate implements WriteGateInterface
{
    public function evaluate(ManagedEnvironment $tenant, string $operationType): void
    {
        if (! $this->isEnabled()) {
            Log::warning('Intune write gate is disabled — write operation proceeding without RBAC verification.', [
                'managed_environment_id' => $tenant->getKey(),
                'operation_type' => $operationType,
            ]);

            return;
        }

        $status = $tenant->rbac_status;

        if ($status === null || $status === 'not_configured') {
            throw new ProviderAccessHardeningRequired(
                tenantId: (int) $tenant->getKey(),
                operationType: $operationType,
                reasonCode: 'intune_rbac.not_configured',
                reasonMessage: 'Intune RBAC is not configured for this tenant. Configure RBAC before performing write operations.',
            );
        }

        if (in_array($status, ['degraded', 'failed', 'error', 'missing', 'partial'], true)) {
            throw new ProviderAccessHardeningRequired(
                tenantId: (int) $tenant->getKey(),
                operationType: $operationType,
                reasonCode: 'intune_rbac.unhealthy',
                reasonMessage: sprintf(
                    'Intune RBAC status is "%s". Resolve RBAC issues before performing write operations.',
                    $status,
                ),
            );
        }

        if ($this->isStale($tenant)) {
            throw new ProviderAccessHardeningRequired(
                tenantId: (int) $tenant->getKey(),
                operationType: $operationType,
                reasonCode: 'intune_rbac.stale',
                reasonMessage: 'Intune RBAC health check is outdated. Run a fresh health check before performing write operations.',
            );
        }
    }

    public function wouldBlock(ManagedEnvironment $tenant): bool
    {
        try {
            $this->evaluate($tenant, 'ui_check');

            return false;
        } catch (ProviderAccessHardeningRequired) {
            return true;
        }
    }

    private function isEnabled(): bool
    {
        return (bool) config('tenantpilot.hardening.intune_write_gate.enabled', true);
    }

    private function isStale(ManagedEnvironment $tenant): bool
    {
        $lastCheckedAt = $tenant->rbac_last_checked_at;

        if ($lastCheckedAt === null) {
            return true;
        }

        $thresholdHours = (int) config('tenantpilot.hardening.intune_write_gate.freshness_threshold_hours', 24);

        return $lastCheckedAt->diffInHours(now()) >= $thresholdHours;
    }
}
