<?php
// Forza la visualizzazione degli errori
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

include('include/headscript.php');

// Importa la libreria QR Code
require_once __DIR__ . '/../../vendor/autoload.php';

use Endroid\QrCode\Builder\Builder;
use Endroid\QrCode\Writer\PngWriter;

// Connessione al database
$dbHandler = DBHandlerSelect::getInstance();
$pdo = $dbHandler->getConnection();

// ID dell'utente loggato (assumiamo sia definito)
if (!isset($iduserlogin)) {
    die("Errore: ID utente non definito.");
}

// Recupera i dati dell'insegnante
$stmt = $pdo->prepare("
    SELECT t.*, u.first_name, u.last_name, u.email 
    FROM auth_users u 
    LEFT JOIN teachers t ON t.user_id = u.id 
    WHERE u.id = ?
");
$stmt->execute([$iduserlogin]);
$teacher = $stmt->fetch();

if (!$teacher) {
    die("Errore: Utente non trovato.");
}

// Determina se è un nuovo insegnante
$is_new = !isset($teacher['id']);
if ($is_new) {
    $teacher = [
        'id' => null,
        'user_id' => $iduserlogin,
        'unique_code' => '',
        'phone' => '',
        'description' => '',
        'specializations' => '',
        'profile_picture' => '',
        'status' => 'active',
        'created_at' => '',
        'updated_at' => '',
        'first_name' => $teacher['first_name'],
        'last_name' => $teacher['last_name'],
        'email' => $teacher['email']
    ];
}

// Funzione per generare un codice univoco
function generateUniqueCode($pdo, $length = 16)
{
    do {
        $code = bin2hex(random_bytes($length / 2));
        $stmt = $pdo->prepare("SELECT COUNT(*) FROM teachers WHERE unique_code = ?");
        $stmt->execute([$code]);
        $count = $stmt->fetchColumn();
    } while ($count > 0);
    return $code;
}

// Generazione del QR Code
$qr_code_path = null;
if (!$is_new) {
    try {
        $unique_code = $teacher['unique_code'];
        if (empty($unique_code)) {
            throw new Exception("Errore: unique_code è vuoto.");
        }

        $base_dir = __DIR__ . '/../../public/userarea/phototeachers/qrcodes/';
        $qr_code_filename = "{$base_dir}{$iduserlogin}-{$unique_code}.png";
        $qr_code_path = "phototeachers/qrcodes/{$iduserlogin}-{$unique_code}.png";

        if (!file_exists($qr_code_filename)) {
            if (!is_dir($base_dir)) {
                mkdir($base_dir, 0755, true) or die("Errore: Impossibile creare la directory.");
            }
            if (!is_writable($base_dir)) {
                die("Errore: La directory non è scrivibile.");
            }

            $builder = new Builder();
            $result = $builder->build(
                writer: new PngWriter(),
                data: $unique_code,
                size: 150,
                margin: 10
            );
            $result->saveToFile($qr_code_filename);
        }
    } catch (Exception $e) {
        $error = "Errore generazione QR Code: " . $e->getMessage();
        error_log($error);
    }
}

// Gestione del form
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $first_name = $_POST['first_name'];
    $last_name = $_POST['last_name'];
    $phone = $_POST['phone'] ?? null;
    $description = $_POST['description'] ?? null;
    $specializations = $_POST['specializations'] ?? null;
    $status = $_POST['status'] === 'active' ? 'active' : 'inactive';

    // Gestione del caricamento della foto
    $profile_picture = $teacher['profile_picture'];
    if (isset($_FILES['profile_picture']) && $_FILES['profile_picture']['error'] === UPLOAD_ERR_OK) {
        $file = $_FILES['profile_picture'];
        $timestamp = time();
        $original_name = basename($file['name']);
        $extension = strtolower(pathinfo($original_name, PATHINFO_EXTENSION));
        $allowed_extensions = ['jpg', 'jpeg', 'png', 'gif'];

        if (in_array($extension, $allowed_extensions)) {
            $new_filename = "phototeachers/{$iduserlogin}-{$timestamp}-{$original_name}";
            if (move_uploaded_file($file['tmp_name'], $new_filename)) {
                $profile_picture = $new_filename;
                if ($teacher['profile_picture'] && file_exists($teacher['profile_picture']) && !$is_new) {
                    unlink($teacher['profile_picture']);
                }
            } else {
                $error = "Errore durante il caricamento della foto.";
            }
        } else {
            $error = "Estensione del file non consentita. Usa JPG, JPEG, PNG o GIF.";
        }
    }

    // Aggiorna auth_users
    $stmt = $pdo->prepare("UPDATE auth_users SET first_name = ?, last_name = ? WHERE id = ?");
    $stmt->execute([$first_name, $last_name, $iduserlogin]);

    if ($is_new) {
        $unique_code = generateUniqueCode($pdo);
        $stmt = $pdo->prepare("
            INSERT INTO teachers (user_id, unique_code, phone, description, specializations, profile_picture, status)
            VALUES (?, ?, ?, ?, ?, ?, ?)
        ");
        $success = $stmt->execute([$iduserlogin, $unique_code, $phone, $description, $specializations, $profile_picture, $status]);

        if ($success) {
            $success_message = "Insegnante creato con successo!";
            $stmt = $pdo->prepare("
                SELECT t.*, u.first_name, u.last_name, u.email 
                FROM auth_users u 
                LEFT JOIN teachers t ON t.user_id = u.id 
                WHERE u.id = ?
            ");
            $stmt->execute([$iduserlogin]);
            $teacher = $stmt->fetch();
            $is_new = false;

            // Genera QR Code per il nuovo insegnante
            try {
                $base_dir = __DIR__ . '/../../public/phototeachers/qrcodes/';
                $qr_code_filename = "{$base_dir}{$iduserlogin}-{$unique_code}.png";
                $qr_code_path = "phototeachers/qrcodes/{$iduserlogin}-{$unique_code}.png";

                if (!file_exists($qr_code_filename)) {
                    if (!is_dir($base_dir)) {
                        mkdir($base_dir, 0755, true) or die("Errore: Impossibile creare la directory.");
                    }
                    $builder = new Builder();
                    $result = $builder->build(
                        writer: new PngWriter(),
                        data: $unique_code,
                        size: 150,
                        margin: 10
                    );
                    $result->saveToFile($qr_code_filename);
                }
            } catch (Exception $e) {
                $error = "Errore generazione QR Code: " . $e->getMessage();
                error_log($error);
            }
        } else {
            $error = "Errore durante la creazione dell'insegnante.";
        }
    } else {
        $stmt = $pdo->prepare("
            UPDATE teachers 
            SET phone = ?, description = ?, specializations = ?, profile_picture = ?, status = ?
            WHERE user_id = ?
        ");
        $success = $stmt->execute([$phone, $description, $specializations, $profile_picture, $status, $iduserlogin]);

        if ($success) {
            $success_message = "Dati aggiornati con successo!";
            $stmt = $pdo->prepare("
                SELECT t.*, u.first_name, u.last_name, u.email 
                FROM auth_users u 
                LEFT JOIN teachers t ON t.user_id = u.id 
                WHERE u.id = ?
            ");
            $stmt->execute([$iduserlogin]);
            $teacher = $stmt->fetch();
        } else {
            $error = "Errore durante l'aggiornamento dei dati.";
        }
    }
}
?>

<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="icon" href="assets/images/favicon-32x32.png" type="image/png" />
    <?php include('cssinclude.php'); ?>
    <?php include('siteinfo.php'); ?>
</head>

<body>
    <div class="wrapper">
        <?php include('include/navbar.php'); ?>
        <?php include('include/topbar.php'); ?>
        <div class="page-wrapper">
            <div class="page-content">
                <div class="card radius-10">
                    <div class="card-header">
                        <h6 class="mb-0"><?php echo $is_new ? 'Crea Profilo Insegnante' : 'Profilo Insegnante'; ?></h6>
                    </div>
                    <div class="card-body">
                        <?php if (isset($success_message)): ?>
                            <div class="alert alert-success" role="alert">
                                <?php echo $success_message; ?>
                            </div>
                        <?php endif; ?>
                        <?php if (isset($error)): ?>
                            <div class="alert alert-danger" role="alert">
                                <?php echo $error; ?>
                            </div>
                        <?php endif; ?>
                        <form method="POST" enctype="multipart/form-data">
                            <div class="row">
                                <div class="col-md-4 text-center">
                                    <div class="mb-3">
                                        <img src="<?php echo $teacher['profile_picture'] ? htmlspecialchars($teacher['profile_picture']) : 'phototeachers/ndphoto.png'; ?>"
                                            alt="Foto Profilo" class="img-fluid rounded-circle" style="width: 150px; height: 150px; object-fit: cover;">
                                    </div>
                                    <div class="mb-3">
                                        <label for="profile_picture" class="form-label">Carica nuova foto</label>
                                        <input type="file" class="form-control" id="profile_picture" name="profile_picture" accept="image/*">
                                    </div>
                                    <?php if (!$is_new && $qr_code_path): ?>
                                        <div class="mb-3">
                                            <label class="form-label">Codice Univoco</label>
                                            <input type="text" class="form-control" value="<?php echo htmlspecialchars($teacher['unique_code']); ?>" readonly>
                                        </div>
                                        <div class="mb-3">
                                            <label class="form-label">QR Code</label><br>
                                            <img src="<?php echo htmlspecialchars($qr_code_path); ?>" alt="QR Code" class="img-fluid" style="width: 150px; height: 150px;">
                                        </div>
                                    <?php endif; ?>
                                </div>
                                <div class="col-md-8">
                                    <div class="row">
                                        <div class="col-md-6 mb-3">
                                            <label for="first_name" class="form-label">Nome</label>
                                            <input type="text" class="form-control" id="first_name" name="first_name" value="<?php echo htmlspecialchars($teacher['first_name']); ?>" required>
                                        </div>
                                        <div class="col-md-6 mb-3">
                                            <label for="last_name" class="form-label">Cognome</label>
                                            <input type="text" class="form-control" id="last_name" name="last_name" value="<?php echo htmlspecialchars($teacher['last_name']); ?>" required>
                                        </div>
                                    </div>
                                    <div class="mb-3">
                                        <label for="email" class="form-label">Email</label>
                                        <input type="email" class="form-control" id="email" name="email" value="<?php echo htmlspecialchars($teacher['email']); ?>" readonly>
                                    </div>
                                    <div class="mb-3">
                                        <label for="phone" class="form-label">Telefono</label>
                                        <input type="text" class="form-control" id="phone" name="phone" value="<?php echo htmlspecialchars($teacher['phone'] ?? ''); ?>">
                                    </div>
                                    <div class="mb-3">
                                        <label for="description" class="form-label">Descrizione</label>
                                        <textarea class="form-control" id="description" name="description" rows="3"><?php echo htmlspecialchars($teacher['description'] ?? ''); ?></textarea>
                                    </div>
                                    <div class="mb-3">
                                        <label for="specializations" class="form-label">Specializzazioni</label>
                                        <textarea class="form-control" id="specializations" name="specializations" rows="2"><?php echo htmlspecialchars($teacher['specializations'] ?? ''); ?></textarea>
                                    </div>
                                    <div class="mb-3">
                                        <label for="status" class="form-label">Stato</label>
                                        <div class="form-check form-switch">
                                            <input class="form-check-input" type="checkbox" id="status" name="status" value="active" <?php echo $teacher['status'] === 'active' ? 'checked' : ''; ?>>
                                            <label class="form-check-label" for="status"><?php echo $teacher['status'] === 'active' ? 'Attivo' : 'Inattivo'; ?></label>
                                        </div>
                                    </div>
                                    <?php if (!$is_new): ?>
                                        <div class="mb-3">
                                            <label class="form-label">Data Creazione</label>
                                            <input type="text" class="form-control" value="<?php echo htmlspecialchars($teacher['created_at']); ?>" readonly>
                                        </div>
                                        <div class="mb-3">
                                            <label class="form-label">Ultimo Aggiornamento</label>
                                            <input type="text" class="form-control" value="<?php echo htmlspecialchars($teacher['updated_at']); ?>" readonly>
                                        </div>
                                    <?php endif; ?>
                                    <button type="submit" class="btn btn-primary"><?php echo $is_new ? 'Crea Profilo' : 'Salva Modifiche'; ?></button>
                                </div>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
        <div class="overlay toggle-icon"></div>
        <a href="javaScript:;" class="back-to-top"><i class='bx bxs-up-arrow-alt'></i></a>
        <?php include('include/footer.php'); ?>
    </div>
    <?php include('jsinclude.php'); ?>
</body>

</html>