<?php
/*
 * login.php
 */

require_once __DIR__ . '/private/auth.php';
require_once __DIR__ . '/private/Template.php';

require_once __DIR__ . '/config/reporting.php';

$auth = new RacketSandboxAuth(__DIR__ . '/data/racket-sandbox.sqlite');

$error = '';

function detect_login_language($supported, $fallback)
{
    $header = $_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? '';
    $preferences = array();

    foreach (explode(',', $header) as $part) {
        $pieces = array_map('trim', explode(';', $part));
        $lang = strtolower($pieces[0] ?? '');
        $quality = 1.0;

        foreach (array_slice($pieces, 1) as $piece) {
            if (strpos($piece, 'q=') === 0) {
                $quality = (float)substr($piece, 2);
            }
        }

        if ($lang !== '') {
            $preferences[] = array('lang' => $lang, 'quality' => $quality);
        }
    }

    usort($preferences, function ($a, $b) {
        return $a['quality'] < $b['quality'] ? 1 : -1;
    });

    foreach ($preferences as $preference) {
        $lang = $preference['lang'];
        $primary = explode('-', $lang, 2)[0];

        if (isset($supported[$lang])) {
            return $lang;
        }

        if (isset($supported[$primary])) {
            return $primary;
        }
    }

    return $fallback;
}

$pageTitle = 'Racket ChatGPT Agent Sandbox Creator';
$templateData = RacketSandboxTemplate::dataFile('login.html');
$texts = $templateData['translations'] ?? array();
$language = detect_login_language($texts, 'en');
$styleVersion = @filemtime(__DIR__ . '/css/styles.css') ?: time();

if ($auth->currentUser() !== null && $_SERVER['REQUEST_METHOD'] !== 'POST') {
    header('Location: /');
    exit;
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    try {
        $auth->login($_POST['email'] ?? '', $_POST['password'] ?? '');
        header('Location: /');
        exit;
    } catch (Throwable $e) {
        $error = $e->getMessage();
    }
}

header('Content-Type: text/html; charset=utf-8');

$loginText = $texts[$language];
$errorHtml = $error === ''
    ? ''
    : RacketSandboxTemplate::renderFile('partials/message.html', array(
        'class' => 'error',
        'message' => $error,
    ));

echo RacketSandboxTemplate::renderFile('login.html', array(
    'language' => $language,
    'page_title' => $pageTitle,
    'style_version' => $styleVersion,
    'error_html' => $errorHtml,
    'email_label' => $loginText['email'],
    'password_label' => $loginText['password'],
    'login_label' => $loginText['login'],
    'account_title' => $loginText['account_title'],
    'account_text' => $loginText['account_text'],
    'account_link' => $loginText['account_link'],
));