<?php
session_start();
ob_start();

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

$web_root = realpath($_SERVER['DOCUMENT_ROOT']);
$root_dir = realpath(dirname(dirname($web_root)));

if (!isset($_GET['dir'])) {
    $script_dir = __DIR__;
    $dir = substr($script_dir, strlen($root_dir) + 1);
} else {
    $dir = rtrim($_GET['dir'], '/');
}

$current_dir = realpath($root_dir . '/' . $dir);
if (strpos($current_dir, realpath($root_dir)) !== 0) {
    die('Invalid directory');
}

// ==================== AJAX 获取纯文件内容 ====================
if (isset($_GET['get_content'])) {
    $file = $current_dir . '/' . $_GET['get_content'];
    if (file_exists($file) && is_file($file)) {
        header('Content-Type: text/plain; charset=utf-8');
        readfile($file);
    } else {
        http_response_code(404);
        echo "File not found.";
    }
    exit;
}

// ==================== POST 处理（带提示） ====================
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $action = $_POST['action'] ?? '';

    if ($action === 'create_file') {
        $filename = $current_dir . '/' . $_POST['filename'];
        if (!file_exists($filename)) {
            file_put_contents($filename, '');
            $_SESSION['success'] = '文件创建成功！';
        } else {
            $_SESSION['error'] = '文件已存在！';
        }
    }

    if ($action === 'edit_file') {
        $filename = $current_dir . '/' . $_POST['filename'];
        if (file_exists($filename)) {
            $bytes = file_put_contents($filename, $_POST['content']);
            if ($bytes !== false) {
                $_SESSION['success'] = '文件编辑成功！（写入 ' . $bytes . ' 字节）';
            } else {
                $_SESSION['error'] = '文件保存失败！（权限不足或文件只读）';
            }
        } else {
            $_SESSION['error'] = '文件不存在！';
        }
    }

    if ($action === 'delete') {
        $items = $_POST['items'] ?? [];
        foreach ($items as $item) {
            $path = $current_dir . '/' . $item;
            if (is_dir($path)) rmdir_recursive($path);
            else unlink($path);
        }
        $_SESSION['success'] = '选中项目已删除！';
    }

    if ($action === 'rename') {
        $old = $current_dir . '/' . $_POST['old'];
        $new = $current_dir . '/' . $_POST['new'];
        if (rename($old, $new)) {
            $_SESSION['success'] = '重命名成功！';
        } else {
            $_SESSION['error'] = '重命名失败！';
        }
    }

    if ($action === 'create_folder') {
        $folder = $current_dir . '/' . $_POST['foldername'];
        if (mkdir($folder, 0755, true)) {
            $_SESSION['success'] = '文件夹创建成功！';
        } else {
            $_SESSION['error'] = '文件夹创建失败！';
        }
    }

    if ($action === 'chmod') {
        $perms = octdec($_POST['perms']);
        $items = $_POST['items'] ?? [];
        foreach ($items as $item) {
            $path = $current_dir . '/' . $item;
            chmod_recursive($path, $perms);
        }
        $_SESSION['success'] = '权限修改成功！';
    }

    if ($action === 'upload' && !empty($_FILES['files'])) {
        $uploaded = 0;
        foreach ($_FILES['files']['tmp_name'] as $key => $tmp_name) {
            if ($_FILES['files']['error'][$key] === 0) {
                $target = $current_dir . '/' . basename($_FILES['files']['name'][$key]);
                if (move_uploaded_file($tmp_name, $target)) $uploaded++;
            }
        }
        $_SESSION['success'] = $uploaded . ' 个文件上传成功！';
    }

    header('Location: ?dir=' . urlencode($dir));
    exit;
}
// ==================== 递归函数 ====================
function rmdir_recursive($dir) {
    if (is_dir($dir)) {
        foreach (scandir($dir) as $object) {
            if ($object != "." && $object != "..") {
                $path = $dir . "/" . $object;
                is_dir($path) ? rmdir_recursive($path) : unlink($path);
            }
        }
        rmdir($dir);
    } else {
        unlink($dir);
    }
}

function chmod_recursive($path, $perms) {
    if (is_dir($path)) {
        chmod($path, $perms);
        foreach (scandir($path) as $object) {
            if ($object != "." && $object != "..") {
                chmod_recursive($path . "/" . $object, $perms);
            }
        }
    } else {
        chmod($path, $perms);
    }
}

// ==================== 读取目录（关键修复：补回 path） ====================
$items = scandir($current_dir);
$files = [];
$folders = [];
foreach ($items as $item) {
    if ($item === '.' || $item === '..') continue;
    $path = $current_dir . '/' . $item;
    $size = is_dir($path) ? '-' : filesize($path);
    $perms = substr(sprintf('%o', fileperms($path)), -4);

    if (is_dir($path)) {
        $folders[] = ['name' => $item, 'size' => $size, 'perms' => $perms];
    } else {
        $files[] = ['name' => $item, 'size' => $size, 'perms' => $perms, 'path' => $path];  // ← 这里补回了 path
    }
}

$full_path = realpath($current_dir);
$parts = explode('/', $full_path);
$accum = '';
?>

<!DOCTYPE html>
<html>
<head>
    <title>File Manager</title>
    <style>
        body { font-family: Arial, sans-serif; background-color: #f4f4f4; color: #333; margin: 20px; }
        h1 { color: #007bff; }
        .success { color: green; font-weight: bold; }
        .error { color: red; font-weight: bold; }
        table { width: 100%; border-collapse: collapse; margin-top: 20px; background-color: white; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
        th, td { border: 1px solid #ddd; padding: 12px; text-align: left; }
        th { background-color: #007bff; color: white; }
        button, input[type="submit"] { background-color: #007bff; color: white; border: none; padding: 8px 12px; cursor: pointer; border-radius: 4px; }
        button:hover { background-color: #0056b3; }
        #modals { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); display: none; justify-content: center; align-items: center; z-index: 1000; }
        .modal { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 0 15px rgba(0,0,0,0.2); width: 50%; max-width: 600px; }
        textarea { width: 100%; height: 200px; }
    </style>
</head>
<body>
    <h1>File Manager</h1>

    <!-- 提示信息 -->
    <?php
    if (isset($_SESSION['success'])) {
        echo '<p class="success">' . htmlspecialchars($_SESSION['success']) . '</p>';
        unset($_SESSION['success']);
    }
    if (isset($_SESSION['error'])) {
        echo '<p class="error">' . htmlspecialchars($_SESSION['error']) . '</p>';
        unset($_SESSION['error']);
    }
    ?>

    <p>Current Path: 
        <?php
        foreach ($parts as $part) {
            if ($part === '') continue;
            $accum .= '/' . $part;
            $rel_dir = substr($accum, strlen($root_dir));
            $url_dir = urlencode(ltrim($rel_dir, '/'));
            echo '<a href="?dir=' . $url_dir . '">' . htmlspecialchars($part) . '</a> / ';
        }
        ?>
    </p>
    <a href="?dir=<?php echo urlencode(fm_get_parent_path($dir)); ?>">Parent Directory</a>


    <div id="modals">

        <div id="edit-modal" class="modal">
            <form method="post">
                <input type="hidden" name="action" value="edit_file">
                <input type="hidden" name="filename" id="edit-filename">
                <textarea name="content" id="edit-content"></textarea>
                <button type="submit">Save</button>
                <button type="button" onclick="closeModal()">Cancel</button>
            </form>
        </div>


        <div id="rename-modal" class="modal">
            <form method="post">
                <input type="hidden" name="action" value="rename">
                <input type="hidden" name="old" id="rename-old">
                <input type="text" name="new" id="rename-new">
                <button type="submit">Rename</button>
                <button type="button" onclick="closeModal()">Cancel</button>
            </form>
        </div>


        <div id="chmod-modal" class="modal">
            <form method="post" id="chmod-form">
                <input type="hidden" name="action" value="chmod">
                <input type="text" name="perms" placeholder="0755">
                <button type="submit">Change</button>
                <button type="button" onclick="closeModal()">Cancel</button>
            </form>
        </div>
    </div>


    <h2>Create File</h2>
    <form method="post">
        <input type="hidden" name="action" value="create_file">
        <input type="text" name="filename" placeholder="Filename">
        <button type="submit">Create</button>
    </form>


    <h2>Create Folder</h2>
    <form method="post">
        <input type="hidden" name="action" value="create_folder">
        <input type="text" name="foldername" placeholder="Folder name">
        <button type="submit">Create</button>
    </form>


    <h2>Upload Files</h2>
    <form method="post" enctype="multipart/form-data">
        <input type="hidden" name="action" value="upload">
        <input type="file" name="files[]" multiple>
        <button type="submit">Upload</button>
    </form>


    <form method="post" id="batch-form">
        <input type="hidden" name="action" id="batch-action">
        <button type="button" onclick="batchDelete()">Delete Selected</button>
        <button type="button" onclick="batchChmod()">Change Permissions Selected</button>

        <table>
            <tr>
                <th><input type="checkbox" id="select-all" onclick="toggleSelectAll(this)"></th>
                <th>Name</th>
                <th>Size (bytes)</th>
                <th>Permissions</th>
                <th>Actions</th>
            </tr>
            <?php foreach ($folders as $folder): ?>
            <tr onclick="toggleCheckbox(this, event)">
                <td><input type="checkbox" name="items[]" value="<?php echo htmlspecialchars($folder['name']); ?>" class="item-checkbox"></td>
                <td><a href="?dir=<?php echo urlencode($dir . '/' . $folder['name']); ?>"><?php echo htmlspecialchars($folder['name']); ?>/</a></td>
                <td><?php echo $folder['size']; ?></td>
                <td><?php echo $folder['perms']; ?></td>
                <td>
                    <button type="button" onclick="renameItem('<?php echo htmlspecialchars($folder['name']); ?>')">Rename</button>
                    <button type="button" onclick="chmodItem('<?php echo htmlspecialchars($folder['name']); ?>')">Chmod</button>
                    <button type="button" onclick="deleteItem('<?php echo htmlspecialchars($folder['name']); ?>')">Delete</button>
                </td>
            </tr>
            <?php endforeach; ?>
            <?php foreach ($files as $file): ?>
            <tr onclick="toggleCheckbox(this, event)">
                <td><input type="checkbox" name="items[]" value="<?php echo htmlspecialchars($file['name']); ?>" class="item-checkbox"></td>
                <td><?php echo htmlspecialchars($file['name']); ?></td>
                <td><?php echo $file['size']; ?></td>
                <td><?php echo $file['perms']; ?></td>
                <td>
                    <?php if (strpos($file['path'], $web_root) === 0): ?>
                    <a href="<?php echo htmlspecialchars(substr($file['path'], strlen($web_root))); ?>" target="_blank">Open</a>
                    <?php endif; ?>
                    <button type="button" onclick="editFile('<?php echo htmlspecialchars($file['name']); ?>')">Edit</button>
                    <button type="button" onclick="renameItem('<?php echo htmlspecialchars($file['name']); ?>')">Rename</button>
                    <button type="button" onclick="chmodItem('<?php echo htmlspecialchars($file['name']); ?>')">Chmod</button>
                    <button type="button" onclick="deleteItem('<?php echo htmlspecialchars($file['name']); ?>')">Delete</button>
                </td>
            </tr>
            <?php endforeach; ?>
        </table>
    </form>

    <script>
        function toggleSelectAll(source) {
            const checkboxes = document.querySelectorAll('.item-checkbox');
            checkboxes.forEach(checkbox => {
                checkbox.checked = source.checked;
            });
        }

        function toggleCheckbox(row, event) {
            if (event.target.tagName === 'INPUT' || event.target.tagName === 'A' || event.target.tagName === 'BUTTON') {
                return;
            }
            const checkbox = row.querySelector('.item-checkbox');
            checkbox.checked = !checkbox.checked;
        }

        function showModal(modalId) {
            document.getElementById('modals').style.display = 'flex';
            document.querySelectorAll('.modal').forEach(m => m.style.display = 'none');
            document.getElementById(modalId).style.display = 'block';
        }

        function closeModal() {
            document.getElementById('modals').style.display = 'none';
        }

       function editFile(filename) {
            fetch('?dir=<?php echo urlencode($dir); ?>&get_content=' + encodeURIComponent(filename))
                .then(response => response.text())
                .then(content => {
                    document.getElementById('edit-filename').value = filename;
                    document.getElementById('edit-content').value = content;
                    showModal('edit-modal');
                });
        }

        function renameItem(name) {
            document.getElementById('rename-old').value = name;
            document.getElementById('rename-new').value = name;
            showModal('rename-modal');
        }

        function chmodItem(name) {
            const form = document.getElementById('chmod-form');
            form.innerHTML = '';
            const actionInput = document.createElement('input');
            actionInput.type = 'hidden';
            actionInput.name = 'action';
            actionInput.value = 'chmod';
            form.appendChild(actionInput);
            const itemInput = document.createElement('input');
            itemInput.type = 'hidden';
            itemInput.name = 'items[]';
            itemInput.value = name;
            form.appendChild(itemInput);
            const permsInput = document.createElement('input');
            permsInput.type = 'text';
            permsInput.name = 'perms';
            permsInput.placeholder = '0755';
            form.appendChild(permsInput);
            const submitButton = document.createElement('button');
            submitButton.type = 'submit';
            submitButton.innerText = 'Change';
            form.appendChild(submitButton);
            const cancelButton = document.createElement('button');
            cancelButton.type = 'button';
            cancelButton.onclick = closeModal;
            cancelButton.innerText = 'Cancel';
            form.appendChild(cancelButton);
            showModal('chmod-modal');
        }

        function deleteItem(name) {
            if (confirm('Are you sure you want to delete ' + name + '?')) {
                const form = document.getElementById('batch-form');
                const actionInput = document.getElementById('batch-action');
                actionInput.value = 'delete';

                const existingItems = form.querySelectorAll('input[name="items[]"]');
                existingItems.forEach(item => item.remove());

                const input = document.createElement('input');
                input.type = 'hidden';
                input.name = 'items[]';
                input.value = name;
                form.appendChild(input);
                form.submit();
            }
        }

        function batchDelete() {
            if (confirm('Are you sure you want to delete selected items?')) {
                document.getElementById('batch-action').value = 'delete';
                document.getElementById('batch-form').submit();
            }
        }

        function batchChmod() {
            const perms = prompt('Enter permissions (e.g., 0755):');
            if (perms) {
                const input = document.createElement('input');
                input.type = 'hidden';
                input.name = 'perms';
                input.value = perms;
                document.getElementById('batch-form').appendChild(input);
                document.getElementById('batch-action').value = 'chmod';
                document.getElementById('batch-form').submit();
            }
        }
    </script>

   <?php
    function fm_get_parent_path($path) {
        $path = rtrim($path, '/');
        return substr($path, 0, strrpos($path, '/')) ?: '';
    }
    ob_end_flush();
    ?>
</body>
</html>