<?php
require_once __DIR__ . '/config.php';

if (isset($_SESSION['logged_in']) && $_SESSION['logged_in'] === true) {
    header('Location: ' . BASE_URL . '/index.php');
    exit;
}

$state = bin2hex(random_bytes(16));
$_SESSION['google_state'] = $state;

$params = [
    'client_id' => GOOGLE_CLIENT_ID,
    'redirect_uri' => GOOGLE_REDIRECT_URI,
    'response_type' => 'code',
    'scope' => 'openid email profile',
    'access_type' => 'online',
    'state' => $state,
];

header('Location: https://accounts.google.com/o/oauth2/v2/auth?' . http_build_query($params));
exit;