<?php
// Αρχείο: /var/www/html/hockey-cms/login.php

if (session_status() === PHP_SESSION_NONE) { session_start(); }

require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/config/database.php';

// Αν ο χρήστης είναι ήδη συνδεδεμένος, τον στέλνουμε ανάλογα με τον ρόλο του
if (isset($_SESSION['user_id'])) {
    if (isset($_SESSION['role_id']) && ($_SESSION['role_id'] == 1 || ($_SESSION['is_seller'] ?? 0) == 1)) {
        header("Location: admin/index.php");
    } else {
        header("Location: index.php");
    }
    exit;
}

// --- Μηχανισμός Αλλαγής Γλώσσας ---
if (isset($_GET['lang']) && in_array($_GET['lang'], ['el', 'en'])) {
    $_SESSION['lang'] = $_GET['lang'];
}
$current_lang = $_SESSION['lang'] ?? 'el';

// --- Εύρεση Ενεργού Theme (Χωρίς backticks για αποφυγή σφαλμάτων) ---
$active_theme = 'default';
try {
    $stmt = $pdo->query("SELECT * FROM settings");
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        if (isset($row['key']) && $row['key'] === 'active_theme' && !empty($row['value'])) {
            $active_theme = trim($row['value']);
        }
    }
} catch (Exception $e) {}

$theme_dir = __DIR__ . '/themes/' . $active_theme;
if (!is_dir($theme_dir)) {
    $active_theme = 'default';
    $theme_dir = __DIR__ . '/themes/default';
}

// --- Αρχικοποίηση Twig ---
$loader = new \Twig\Loader\FilesystemLoader($theme_dir);
$twig = new \Twig\Environment($loader, ['cache' => false]);

$twig->addGlobal('session', $_SESSION);
$twig->addGlobal('current_lang', $current_lang);

// --- Φόρτωση Δυναμικών Κειμένων Site ---
$siteTexts = [];
try {
    $text_column = ($current_lang === 'en') ? 'text_value_en' : 'text_value_el';
    $textsStmt = $pdo->query("SELECT text_key, {$text_column} as text_value FROM site_texts");
    while ($row = $textsStmt->fetch(PDO::FETCH_ASSOC)) {
        $siteTexts[$row['text_key']] = $row['text_value'];
    }
} catch (Exception $e) {}
$twig->addGlobal('text', $siteTexts);

// --- Φόρτωση Logo Site ---
$site_logo = '';
try {
    $stmtSettings = $pdo->query("SELECT * FROM settings");
    while ($row = $stmtSettings->fetch(PDO::FETCH_ASSOC)) {
        if (isset($row['key']) && $row['key'] === 'site_logo') {
            $site_logo = $row['value'];
        }
    }
} catch (Exception $e) {}
$twig->addGlobal('site_logo', $site_logo);

// --- Μεταφράσεις για τη φόρμα σύνδεσης ---
$translations = [
    'el' => [
        'page_title' => 'Σύνδεση - Hockey CMS',
        'heading' => 'Καλώς ήρθατε',
        'subheading' => 'Συνδεθείτε στον λογαριασμό σας',
        'username' => 'Email ή Username',
        'password' => 'Κωδικός Πρόσβασης',
        'btn_login' => 'Σύνδεση',
        'btn_google' => 'Σύνδεση με Google',
        'register_text' => 'Δεν έχετε λογαριασμό;',
        'register_link' => 'Εγγραφείτε εδώ',
        'err_empty' => 'Παρακαλώ συμπληρώστε όλα τα πεδία.',
        'err_invalid' => 'Λάθος στοιχεία σύνδεσης.'
    ],
    'en' => [
        'page_title' => 'Login - Hockey CMS',
        'heading' => 'Welcome Back',
        'subheading' => 'Sign in to your account',
        'username' => 'Email or Username',
        'password' => 'Password',
        'btn_login' => 'Sign In',
        'btn_google' => 'Sign in with Google',
        'register_text' => "Don't have an account?",
        'register_link' => 'Register here',
        'err_empty' => 'Please fill in all fields.',
        'err_invalid' => 'Invalid login credentials.'
    ]
];
$t = $translations[$current_lang];
$error = '';

// --- Διαχείριση POST (Κλασικό Login) ---
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $username = trim($_POST['username'] ?? '');
    $password = $_POST['password'] ?? '';

    if (empty($username) || empty($password)) {
        $error = $t['err_empty'];
    } else {
        $stmt = $pdo->prepare("SELECT * FROM users WHERE username = ? OR email = ?");
        $stmt->execute([$username, $username]);
        $user = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($user && password_verify($password, $user['password'])) {
            session_regenerate_id(true);
            $_SESSION['user_id'] = $user['id'];
            $_SESSION['username'] = $user['username'];
            $_SESSION['role_id'] = $user['role_id'];
            $_SESSION['first_name'] = $user['first_name'] ?? '';
            $_SESSION['is_seller'] = $user['is_seller'] ?? 0;

            if ($user['role_id'] == 1 || $user['is_seller'] == 1) {
                header("Location: admin/index.php");
            } else {
                header("Location: index.php");
            }
            exit;
        } else {
            $error = $t['err_invalid'];
        }
    }
}

// Render μέσω Twig από τον φάκελο του ενεργού theme
echo $twig->render('login.html.twig', [
    't' => $t,
    'current_lang' => $current_lang,
    'error' => $error,
    'site_title' => 'Hockey Gear CMS'
]);