<?php

namespace App\Services;

use App\Enums\LicenseStatus;
use App\Models\DeploymentInstallation;
use App\Models\Device;
use App\Models\License;
use App\Models\Tenant;
use App\Models\User;

class LicenseEntitlementService
{
    public function allowsUse(int $tenantId): bool
    {
        $license = $this->current($tenantId);

        return $license !== null && ($license->grace_until ?? $license->expires_at)->isFuture();
    }

    public function provisionInitial(Tenant $tenant, DeploymentInstallation $installation, string $planCode, bool $activate = false, ?int $issuerId = null): License
    {
        $plan = config("billing.plans.{$planCode}");
        abort_unless($plan && $plan['deployment'] === $installation->deployment_type->value, 422, 'Paket tidak sesuai deployment tenant.');
        $isFree = $plan['price'] === 0;
        $startsAt = now();

        return License::withoutGlobalScope('tenant')->create([
            'tenant_id' => $tenant->id, 'deployment_installation_id' => $installation->id,
            'license_key_hash' => hash('sha256', random_bytes(32)), 'plan' => $planCode,
            'status' => $activate || $isFree ? LicenseStatus::Active : LicenseStatus::Pending,
            'max_devices' => $plan['max_devices'], 'max_users' => $plan['max_users'], 'features' => ['device_access_management'],
            'starts_at' => $startsAt, 'expires_at' => $isFree ? $startsAt->copy()->addYears(10) : $startsAt->copy()->addMonth(),
            'grace_until' => $isFree ? null : $startsAt->copy()->addMonth()->addDays(7),
            'issued_by' => $issuerId,
        ]);
    }

    public function current(int $tenantId): ?License
    {
        $license = License::withoutGlobalScope('tenant')->where('tenant_id', $tenantId)
            ->whereIn('status', [LicenseStatus::Active->value, LicenseStatus::Grace->value])
            ->latest('created_at')->first();
        if ($license) {
            return $license;
        }
        if (License::withoutGlobalScope('tenant')->where('tenant_id', $tenantId)->exists()) {
            return null;
        }
        $installation = DeploymentInstallation::withoutGlobalScope('tenant')->where('tenant_id', $tenantId)->first();
        if (! $installation || $installation->deployment_type->value !== 'managed_cloud') {
            return null;
        }
        $plan = config('billing.plans.cloud_free');

        return License::withoutGlobalScope('tenant')->create([
            'tenant_id' => $tenantId, 'deployment_installation_id' => $installation->id,
            'license_key_hash' => hash('sha256', random_bytes(32)), 'plan' => 'cloud_free',
            'status' => LicenseStatus::Active, 'max_devices' => $plan['max_devices'], 'max_users' => $plan['max_users'],
            'features' => ['device_access_management'], 'starts_at' => now(), 'expires_at' => now()->addYears(10),
        ]);
    }

    public function assertCanAddDevice(int $tenantId): void
    {
        $license = $this->current($tenantId);
        abort_unless($license, 402, 'Lisensi tenant belum aktif.');
        abort_if($license->max_devices !== null && Device::withoutGlobalScope('tenant')->where('tenant_id', $tenantId)->count() >= $license->max_devices, 422, 'Batas perangkat paket tercapai. Upgrade paket melalui menu Lisensi & Tagihan.');
    }

    public function assertCanAddUser(int $tenantId): void
    {
        $license = $this->current($tenantId);
        abort_unless($license, 402, 'Lisensi tenant belum aktif.');
        abort_if($license->max_users !== null && User::withoutGlobalScope('tenant')->where('tenant_id', $tenantId)->count() >= $license->max_users, 422, 'Batas user aplikasi paket tercapai. Upgrade paket melalui menu Lisensi & Tagihan.');
    }
}