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

function idea_redirect(string $lang, string $status): never {
    $lang = preg_replace('/[^a-z]/', '', strtolower($lang));
    if ($lang === '') {
        $lang = 'en';
    }
    header('Location: blog.php?lang=' . rawurlencode($lang) . '&idea=' . rawurlencode($status) . '&saved=' . time() . '#visitor-ideas', true, 303);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    exit;
}

$lang = (string) ($_POST['lang'] ?? 'en');

if ((int) ($_SERVER['CONTENT_LENGTH'] ?? 0) > 4096) {
    idea_redirect($lang, 'invalid');
}

if (visitor_idea_clean((string) ($_POST['company_site'] ?? ''), 80) !== '') {
    idea_redirect($lang, 'thanks');
}

$name = visitor_idea_clean((string) ($_POST['visitor_name'] ?? ''), 80);
$idea = visitor_idea_clean((string) ($_POST['visitor_idea'] ?? ''), 600);

if (strlen($idea) < 10) {
    idea_redirect($lang, 'invalid');
}

if (visitor_ideas_recently_submitted()) {
    idea_redirect($lang, 'slow');
}

if (!visitor_ideas_append($name, $idea)) {
    idea_redirect($lang, 'error');
}

idea_redirect($lang, 'thanks');