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Viewing: LicenseModel.php

<?php

namespace App\Models;

use CodeIgniter\Model;

class LicenseModel extends Model
{
    protected $table = 'licenses';
    protected $primaryKey = 'id';
    protected $returnType = 'array';

    protected $allowedFields = [
        'license_key',
        'client_name',
        'client_email',
        'client_phone',
        'plan_name',
        'activation_date',
        'expiration_date',
        'grace_period_days',
        'status',
        'master_pin_hash',
        'integrity_hash',
        'provider_name',
        'provider_phone',
        'provider_email',
        'notes',
    ];

    protected $useTimestamps = true;
    protected $createdField  = 'created_at';
    protected $updatedField  = 'updated_at';

    /**
     * Obtiene la licencia actual (siempre la más reciente activa o la última)
     */
    public function getCurrentLicense(): ?array
    {
        return $this->orderBy('id', 'DESC')->first();
    }

    /**
     * Verifica si la licencia ha expirado (incluyendo período de gracia)
     */
    public function isFullyExpired(?array $license = null): bool
    {
        $license = $license ?? $this->getCurrentLicense();
        if (!$license) return true;

        $expiration = strtotime($license['expiration_date']);
        $graceEnd = $expiration + ($license['grace_period_days'] * 86400);

        return time() > $graceEnd;
    }

    /**
     * Verifica si la licencia expiró pero está en período de gracia
     */
    public function isInGracePeriod(?array $license = null): bool
    {
        $license = $license ?? $this->getCurrentLicense();
        if (!$license) return false;

        $expiration = strtotime($license['expiration_date']);
        $graceEnd = $expiration + ($license['grace_period_days'] * 86400);
        $now = time();

        return $now > $expiration && $now <= $graceEnd;
    }

    /**
     * Calcula los días restantes de licencia
     */
    public function daysRemaining(?array $license = null): int
    {
        $license = $license ?? $this->getCurrentLicense();
        if (!$license) return 0;

        $expiration = strtotime($license['expiration_date']);
        $diff = $expiration - time();

        return max(0, (int) ceil($diff / 86400));
    }

    /**
     * Genera un hash de integridad para evitar manipulación manual
     */
    public function generateIntegrityHash(array $license): string
    {
        $secret = env('LICENSE_SECRET', 'POS-SYSTEM-2026-SECURE');
        $payload = $license['license_key']
            . $license['activation_date']
            . $license['expiration_date']
            . $license['status']
            . $secret;

        return hash('sha256', $payload);
    }

    /**
     * Verifica la integridad de una licencia
     */
    public function verifyIntegrity(?array $license = null): bool
    {
        $license = $license ?? $this->getCurrentLicense();
        if (!$license) return false;

        $expected = $this->generateIntegrityHash($license);
        return hash_equals($expected, $license['integrity_hash'] ?? '');
    }

    /**
     * Genera una clave de licencia única
     */
    public function generateLicenseKey(): string
    {
        $segments = [];
        for ($i = 0; $i < 4; $i++) {
            $segments[] = strtoupper(substr(md5(random_bytes(16) . microtime()), 0, 5));
        }
        return implode('-', $segments);
    }

    /**
     * Verifica el PIN maestro
     */
    public function verifyMasterPin(string $pin, ?array $license = null): bool
    {
        $license = $license ?? $this->getCurrentLicense();
        if (!$license) {
            // Si no hay licencia, verificar contra el PIN del .env
            $envHash = env('LICENSE_MASTER_PIN_HASH', '');
            if (empty($envHash)) return false;
            return password_verify($pin, $envHash);
        }

        return password_verify($pin, $license['master_pin_hash']);
    }

    /**
     * Actualiza automáticamente el estado según las fechas
     */
    public function syncStatus(?array $license = null): ?array
    {
        $license = $license ?? $this->getCurrentLicense();
        if (!$license || $license['status'] === 'suspended') return $license;

        $newStatus = $license['status'];

        if ($this->isFullyExpired($license)) {
            $newStatus = 'expired';
        } elseif ($this->isInGracePeriod($license)) {
            $newStatus = 'grace_period';
        } elseif (strtotime($license['expiration_date']) > time()) {
            $newStatus = 'active';
        }

        if ($newStatus !== $license['status']) {
            $license['status'] = $newStatus;
            $license['integrity_hash'] = $this->generateIntegrityHash($license);
            $this->update($license['id'], [
                'status' => $newStatus,
                'integrity_hash' => $license['integrity_hash'],
            ]);
        }

        return $license;
    }
}
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