<?php
/**
 * vision.php — Intégration Vision (licence)
 * API : GET https://vision.copydev.fr/api/license.php?key=<key>&machine_id=<id>&hostname=<host>
 */

define('VISION_LICENSE_URL', 'https://vision.copydev.fr/api/license.php');
define('VISION_PRODUCT',     'copymail');

function vision_machine_id(): string {
    $id = cfg('vision_machine_id', '');
    if (!$id) {
        $id = strtolower('copymail-' . bin2hex(random_bytes(6)));
        cfg_set('vision_machine_id', $id);
    }
    return $id;
}

function vision_check(): array {
    $key = cfg('vision_license_key', '');
    if (!$key) {
        return ['valid' => false, 'msg' => 'Licence non configurée.', 'unconfigured' => true];
    }

    $url = VISION_LICENSE_URL . '?' . http_build_query([
        'key'        => $key,
        'machine_id' => vision_machine_id(),
        'hostname'   => cfg('hostname', gethostname()),
    ]);

    $ctx = stream_context_create(['http' => [
        'method'        => 'GET',
        'timeout'       => 5,
        'ignore_errors' => true,
    ]]);

    $resp = @file_get_contents($url, false, $ctx);

    if ($resp === false) {
        // Vision injoignable — on vérifie le délai offline autorisé
        $lastOk   = (int)cfg('vision_last_ok', '0');
        $timeout  = (int)cfg('vision_offline_timeout', '72');
        $elapsed  = (time() - $lastOk) / 3600;
        if ($lastOk && $elapsed < $timeout) {
            return ['valid' => true, 'msg' => "Vision injoignable (mode dégradé, {$timeout}h max)", 'degraded' => true];
        }
        return ['valid' => false, 'msg' => 'Vision injoignable et délai offline dépassé.'];
    }

    $data = json_decode($resp, true);

    if (!empty($data['valid'])) {
        cfg_set('vision_last_ok', (string)time());
        cfg_set('vision_offline_timeout', (string)($data['offline_timeout_hours'] ?? 72));
        return [
            'valid'   => true,
            'client'  => $data['client'] ?? '',
            'product' => $data['product'] ?? '',
            'expires' => $data['expires_at'] ?? null,
            'devices' => $data['max_devices'] ?? 1,
        ];
    }

    return ['valid' => false, 'msg' => $data['message'] ?? 'Licence invalide.'];
}