<?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

session_start();

if (empty($_SESSION['user_id']))
{
    header('Location: login.php');
    exit();
}

$userId = (int)$_SESSION['user_id'];

if ($_SERVER['REQUEST_METHOD'] !== 'POST')
{
    header('Location: account.php');
    exit();
}

if (!isset($_FILES['uploadFile']) || !is_array($_FILES['uploadFile']))
{
    header('Location: account.php?upload=err');
    exit();
}

$file = $_FILES['uploadFile'];

$fileError = isset($file['error']) ? (int)$file['error'] : UPLOAD_ERR_NO_FILE;
if ($fileError !== UPLOAD_ERR_OK)
{
    header('Location: account.php?upload=err');
    exit();
}

// Basic Validierung
$tmp = isset($file['tmp_name']) ? (string)$file['tmp_name'] : '';
if ($tmp === '' || !is_uploaded_file($tmp))
{
    header('Location: account.php?upload=err');
    exit();
}

$allowedMimeToExt = [
    'image/jpeg' => 'jpg',
    'image/png' => 'png',
    'image/webp' => 'webp'
];

$finfo = new finfo(FILEINFO_MIME_TYPE);
$mime = $finfo->file($tmp);

if (!$mime || !isset($allowedMimeToExt[$mime]))
{
    header('Location: account.php?upload=err');
    exit();
}

$ext = $allowedMimeToExt[$mime];

$targetDir = '/assets/images/profilePictures';
if (!is_dir($targetDir))
{
    @mkdir($targetDir, 0755, true);
}

// Fallback-kompatibler Name (auch ohne random_bytes)
$rand = uniqid('', true);
$rand = str_replace('.', '', $rand);
$filename = 'user_' . $userId . '_' . $rand . '.' . $ext;
$targetPath = $targetDir . DIRECTORY_SEPARATOR . $filename;

if (!move_uploaded_file($tmp, $targetPath))
{
    header('Location: account.php?upload=err');
    exit();
}

// Pfad, der in HTML genutzt wird (relativ zur Webroot)
$publicPath = '/assets/images/profilePictures/' . $filename;

$servername = "localhost";
$port = 3306;
$username = "FSST";
$password = "L9wUNZZ9Qkbt";
$db = "FSST";

$conn = mysqli_connect($servername, $username, $password, $db, $port);
if (!$conn)
{
    header('Location: account.php?upload=err');
    exit();
}

$stmt = mysqli_prepare($conn, "UPDATE users SET profilePicture = ? WHERE userID = ?");
if (!$stmt)
{
    mysqli_close($conn);
    header('Location: account.php?upload=err');
    exit();
}

mysqli_stmt_bind_param($stmt, 'si', $publicPath, $userId);
$ok = mysqli_stmt_execute($stmt);
mysqli_stmt_close($stmt);
mysqli_close($conn);

if (!$ok)
{
    header('Location: account.php?upload=err');
    exit();
}

header('Location: account.php?upload=ok');
exit();