<?php
require_once dirname(__DIR__, 2) . '/vendor/autoload.php';
require_once __DIR__ . '/class/VisualLimsApiClient.class.php';

header('Content-Type: application/json');

// Disable PHP error display
ini_set('display_errors', '0');
error_reporting(E_ALL);

try {
    $api = VisualLimsApiClient::getInstance(); // also loads dotenv

    // In simulate mode: return fake users
    if (($_ENV['SIMULATE_EXPORT_LIMS'] ?? '') === 'true') {
        $fakeUsers = [
            [
                'IdUtente' => 1001,
                'Nominativo' => 'Utente Simulato 1001'
            ],
            [
                'IdUtente' => 1002,
                'Nominativo' => 'Utente Simulato 1002'
            ]
        ];

        echo json_encode(['value' => $fakeUsers]);
        exit;
    }

    // OData parameters
    $params = [];

    // Build query string
    $queryString = http_build_query($params);

    // Final endpoint
    $endpoint = "Utente?$queryString";

    // Function to execute request with retry
    function makeApiRequest($api, $endpoint, $maxRetries = 3)
    {
        for ($retry = 0; $retry < $maxRetries; $retry++) {
            try {
                $data = $api->get($endpoint);

                // Save response for debug
                file_put_contents(__DIR__ . '/utenti_response.json', json_encode($data, JSON_PRETTY_PRINT));

                return $data;
            } catch (Exception $e) {
                $errorMessage = $e->getMessage();

                // Retry only on token/auth-related issue
                if (
                    strpos($errorMessage, 'HTTP 400') !== false &&
                    strpos($errorMessage, 'Cannot persist the object') !== false
                ) {
                    try {
                        $api->refreshToken(); // must exist in VisualLimsApiClient
                        error_log("Tentativo $retry: Refresh token eseguito per endpoint $endpoint");
                    } catch (Exception $refreshEx) {
                        error_log("Errore durante il refresh del token: " . $refreshEx->getMessage());
                        throw new Exception("Impossibile eseguire il refresh del token: " . $refreshEx->getMessage());
                    }

                    usleep(500000); // 500 ms
                    continue;
                }

                throw $e;
            }
        }

        throw new Exception("Massimo numero di tentativi raggiunto per $endpoint");
    }

    // Execute request
    $data = makeApiRequest($api, $endpoint);

    echo json_encode($data);
} catch (Exception $e) {
    http_response_code(500);

    $errorResponse = [
        'error' => $e->getMessage(),
        'file'  => $e->getFile(),
        'line'  => $e->getLine(),
        'trace' => $e->getTraceAsString()
    ];

    error_log("Errore in get_utenti.php: " . json_encode($errorResponse));
    echo json_encode($errorResponse);
}