<?php
require_once dirname(__DIR__, 2) . '/vendor/autoload.php';
require_once __DIR__ . '/class/db-functions.php';
include dirname(__DIR__) . '/../extra/auth.php';
if (!Auth::check()) { http_response_code(401); echo json_encode(['error' => 'Unauthorized']); exit; }

require_once __DIR__ . '/class/VisualLimsApiClient.class.php';

header('Content-Type: application/json');
ini_set('display_errors', '0');
error_reporting(E_ALL);

$q = mb_strtolower(trim($_GET['q'] ?? ''));
$limit = max(1, min(50, intval($_GET['limit'] ?? 20)));
$id = isset($_GET['id']) ? intval($_GET['id']) : null;

try {
    // Load from cache or API
    $cacheFile = __DIR__ . '/cache/clienti.json';
    if (file_exists($cacheFile) && (time() - filemtime($cacheFile) < 3600)) {
        $data = json_decode(file_get_contents($cacheFile), true);
    } else {
        $api = VisualLimsApiClient::getInstance();
        $params = [
            '$select' => 'IdCliente,Nominativo,CodiceCliente',
            '$orderby' => 'Nominativo asc'
        ];
        $data = $api->get("Cliente?" . http_build_query($params));
        if (!is_dir(__DIR__ . '/cache')) mkdir(__DIR__ . '/cache', 0777, true);
        file_put_contents($cacheFile, json_encode($data));
    }

    $clients = $data['value'] ?? [];

    // If requesting by specific ID (for loading selected value)
    if ($id !== null) {
        foreach ($clients as $c) {
            if ((int)$c['IdCliente'] === $id) {
                echo json_encode(['results' => [['id' => $c['IdCliente'], 'text' => trim($c['Nominativo'] ?? '')]]]);
                exit;
            }
        }
        echo json_encode(['results' => []]);
        exit;
    }

    // Search by query
    $results = [];
    foreach ($clients as $c) {
        $name = trim($c['Nominativo'] ?? '');
        $code = trim($c['CodiceCliente'] ?? '');
        if ($q === '' || mb_strpos(mb_strtolower($name), $q) !== false || mb_strpos(mb_strtolower($code), $q) !== false) {
            $results[] = ['id' => $c['IdCliente'], 'text' => $name];
            if (count($results) >= $limit) break;
        }
    }

    echo json_encode(['results' => $results]);
} catch (Exception $e) {
    http_response_code(500);
    echo json_encode(['error' => $e->getMessage()]);
}