<?php
session_start();
require_once '../config/db.php';
require_once '../includes/functions.php';

require_once '../vendor/autoload.php';

if (!isset($_SESSION['loggedin']) || $_SESSION['loggedin'] !== true) {
    header("location: ../index.php");
    exit;
}

if (isset($_GET['code'])) {
    $client_id = get_setting($pdo_sys, 'google_client_id');
    $client_secret = get_setting($pdo_sys, 'google_client_secret');

    $client = new Google\Client();
    $client->setClientId($client_id);
    $client->setClientSecret($client_secret);
    
    $protocol = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on') ? "https" : "http";
    $host = $_SERVER['HTTP_HOST'];
    $base_dir = dirname(dirname($_SERVER['PHP_SELF']));
    $redirect_uri = $protocol . "://" . $host . $base_dir . "/auth/google_callback.php";
    $redirect_uri = str_replace('//auth', '/auth', $redirect_uri);
    
    $client->setRedirectUri($redirect_uri);

    try {
        $token = $client->fetchAccessTokenWithAuthCode($_GET['code']);
        
        if (!isset($token['error'])) {
            if (isset($token['refresh_token'])) {
                save_setting($pdo_sys, 'google_refresh_token', $token['refresh_token'], $_SESSION['fullname']);
                add_log($pdo_sys, $_SESSION['cid'], $_SESSION['fullname'], 'Google Auth', 'Successfully connected and received refresh token');
                
                $_SESSION['settings_msg'] = "เชื่อมต่อบัญชี Google สำเร็จแล้ว!";
            } else {
                $_SESSION['settings_error'] = "ไม่ได้รับ Refresh Token กรณีเคยอนุญาตสิทธิ์ไปแล้ว กรุณาไปที่ Google Account > Security > Third-party apps เพื่อลบสิทธิ์ออกก่อน แล้วลองเชื่อมต่อใหม่อีกครั้ง";
            }
        } else {
            $_SESSION['settings_error'] = "เกิดข้อผิดพลาดในการรับ Token: " . $token['error'];
        }
    } catch (Exception $e) {
        $_SESSION['settings_error'] = "เกิดข้อผิดพลาด: " . $e->getMessage();
    }
} else if (isset($_GET['error'])) {
    $_SESSION['settings_error'] = "ถูกปฏิเสธการเข้าถึง: " . $_GET['error'];
}

header("location: ../settings.php");
exit;
?>