<?php

require_once __DIR__ . '/config.php';

session_start();

function is_logged_in()

{

return !empty($_SESSION['user_id']);

}

function require_login()

{

if (!is_logged_in()) {

header('Location: /POS/index.php');

exit;

}

}

function current_user()

{

if (!is_logged_in()) return null;

return [

'id' => $_SESSION['user_id'],

'username' => $_SESSION['username'],

'email' => $_SESSION['email'],

'role' => $_SESSION['role'],

];

}

// Flash message helpers (store short-lived messages in session)

function set_flash($type, $message)

{

if (!isset($_SESSION['_flash'])) $_SESSION['_flash'] = [];

$_SESSION['_flash'][] = ['type' => $type, 'message' => $message];

}

// Retrieve and consume flash messages; returns array of items: ['type'=>..., 'message'=>...]

function get_flash()

{

if (empty($_SESSION['_flash'])) return [];

$f = $_SESSION['_flash'];

unset($_SESSION['_flash']);

return $f;

}

// Convenience: echo flash HTML (used in templates)

function render_flash()

{

$flashes = get_flash();

if (!$flashes) return;

foreach ($flashes as $f) {

$cls = $f['type'] === 'success' ? 'flash-success' : 'flash-error';

$msg = htmlspecialchars($f['message'], ENT_QUOTES, 'UTF-8');

echo "<div class=\"$cls\">$msg</div>";

}

}