class FileManagerModule {
    constructor() {
        this.commands = {};
        this.commandsMeta = {
            'files': { argType: 'file' }, 'preview': { argType: 'file' },
        };
        this.terminal = null;
        this.currentPath = [];
        this._overlay = null;
        this._selectedFile = null;
        this._multiSelect = new Set();  // v4.5.78: multi-select for batch ops
        this._selectMode = false;       // v4.6.35: tap-to-select mode (touch devices)
        this._itemCount = 0;            // items rendered in the current directory/filter
        this._clipboard = { mode: null, paths: [] };  // 'copy' or 'cut'
        this._searchFilter = '';
        this._rawMode = false;
        this._inlineHtml = false;
    }

    requirements() {
        return { met: true, missing: [] };
    }

    getHelpInfo() {
        return {
            'files': 'files — Open the file manager overlay with VFS directory listing, preview, encrypt, zip',
            'preview': 'preview <path> — Preview a specific file',
        };
    }

    registerCommands() {
        this.commands['files'] = () => this._openOverlay();
        this.commands['preview'] = (args) => this._previewCommand(args);
    }

    _previewCommand(args) {
        if (!args[0]) return this.terminal.print('Usage: preview <path>', 'warning');
        const path = args.join(' ');
        this._openOverlay();
        this._navigateToPathFromParts(path);
        const content = this.terminal.fs.readFile(path);
        if (content === null || content === false) {
            this._renderPreviewError('File not found: ' + path);
            return;
        }
        this._selectedFile = path;
        this._renderPreview(path, content);
        this._highlightSelected();
    }

    _navigateToPathFromParts(path) {
        const parts = path.split('/').filter(p => p);
        if (parts.length <= 1) {
            this.currentPath = [];
            return;
        }
        this.currentPath = parts.slice(0, -1);
    }

    _detectType(filePath) {
        const ext = filePath.split('.').pop().toLowerCase();
        if (!ext || ext === filePath) return 'other';
        const imageExts = ['jpg', 'jpeg', 'png', 'gif', 'webp', 'bmp', 'ico'];
        const videoExts = ['mp4', 'webm', 'avi', 'mov', 'mkv'];
        const audioExts = ['mp3', 'wav', 'ogg', 'flac', 'aac', 'm4a'];
        const codeExts = ['js', 'py', 'css', 'yaml', 'yml', 'toml'];
        if (ext === 'md') return 'md';
        if (imageExts.includes(ext)) return 'image';
        if (videoExts.includes(ext)) return 'video';
        if (audioExts.includes(ext)) return 'audio';
        if (codeExts.includes(ext)) return 'code';
        if (ext === 'html') return 'html';
        if (ext === 'json') return 'json';
        if (ext === 'csv') return 'csv';
        if (ext === 'pdf') return 'pdf';
        if (ext === 'svg') return 'svg';
        if (ext === 'txt') return 'text';
        return 'other';
    }

    _renderMarkdown(text) {
        if (!text) return '';
        try {
            let html = text
                .replace(/&/g, '&amp;')
                .replace(/</g, '&lt;')
                .replace(/>/g, '&gt;');
            // code blocks first
            html = html.replace(/```([\s\S]*?)```/g, '<pre><code>$1</code></pre>');
            // inline code
            html = html.replace(/`([^`]+)`/g, '<code>$1</code>');
            // headers
            html = html.replace(/^### (.+)$/gm, '<h3 style="color:var(--accent-color);margin:8px 0 4px">$1</h3>');
            html = html.replace(/^## (.+)$/gm, '<h2 style="color:var(--accent-color);margin:10px 0 4px">$1</h2>');
            html = html.replace(/^# (.+)$/gm, '<h1 style="color:var(--accent-color);margin:12px 0 6px">$1</h1>');
            // bold
            html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
            // italic
            html = html.replace(/\*(.+?)\*/g, '<em>$1</em>');
            // links — v4.5.67: sanitize URL to prevent javascript: scheme injection
            html = html.replace(/\[([^\]]+)\]\(([^)]+)\)/g, (match, text, url) => {
                const safeUrl = /^(https?:\/\/|mailto:|\/|#)/.test(url) ? url : '#';
                return `<a href="${safeUrl}" target="_blank" style="color:var(--info-color)">${text}</a>`;
            });
            // horizontal rules
            html = html.replace(/^---$/gm, '<hr style="border-color:var(--border-color);margin:8px 0">');
            // unordered lists
            html = html.replace(/^[\s]*[-*]\s+(.+)$/gm, '<li style="margin-left:16px;list-style:disc">$1</li>');
            // paragraphs - double newlines
            html = html.replace(/\n\n/g, '</p><p style="margin:6px 0">');
            html = '<p style="margin:6px 0">' + html + '</p>';
            return html;
        } catch (e) {
            return '<pre style="white-space:pre-wrap">' + text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;') + '</pre>';
        }
    }

    _getPreviewHtml(path, content) {
        if (content === null || content === false) {
            return '<div style="color:var(--error-color);padding:20px">File not found: ' + this._escapeHtml(path) + '</div>';
        }

        const type = this._detectType(path);
        const ext = path.split('.').pop().toLowerCase();
        const fileName = path.split('/').pop() || path;

        // Handle binary detection for media types
        if (typeof content !== 'string') {
            return '<div style="padding:20px;text-align:center;color:var(--text-muted)">Cannot preview: non-string content</div>';
        }
        const isLikelyBinary = content.length > 0 && !content.startsWith('\n') && !content.startsWith('\r') && !content.startsWith(' ') && !content.startsWith('<') && !content.startsWith('{') && !content.startsWith('[') && content.charCodeAt(0) < 32 && content.charCodeAt(0) !== 9 && content.charCodeAt(0) !== 10 && content.charCodeAt(0) !== 13;

        const isTextContent = typeof content === 'string' && (content.startsWith('{') || content.startsWith('[') || content.startsWith('<') || content.startsWith('#') || /^[\w\s\n\r\t.,;:!?()\-=+*@#$%^&"'\/\\|`~]/.test(content.substring(0, 100)));

        if (type === 'md' && isTextContent) {
            return '<div class="markdown-preview" style="padding:12px;font-family:var(--font-primary);line-height:1.5">' + this._renderMarkdown(content) + '</div>';
        }

        if (type === 'html') {
            // Render HTML in an inline sandbox frame
            const safeHtml = content
                .replace(/<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi, '')
                .replace(/on\w+\s*=\s*"[^"]*"/gi, '')
                .replace(/on\w+\s*=\s*'[^']*'/gi, '');
            return '<div style="padding:0;width:100%;height:60vh;border:none;overflow:hidden">' +
                '<iframe srcdoc="' + this._escapeHtml(safeHtml.replace(/"/g, '&quot;').replace(/'/g, '&#39;')) + '" ' +
                'style="width:100%;height:100%;border:none;background:#fff" sandbox="allow-same-origin"></iframe></div>';
        }

        if (type === 'text') {
            const truncated = content.substring(0, 2000);
            const extra = content.length > 2000 ? '<div style="color:var(--text-muted);margin-top:8px">(truncated to 2000 chars)</div>' : '';
            return '<pre style="white-space:pre-wrap;padding:12px;font-family:var(--font-primary);font-size:0.9em;margin:0;overflow-x:auto">' + this._escapeHtml(truncated) + extra + '</pre>';
        }

        if (type === 'json') {
            try {
                const parsed = JSON.parse(content);
                const formatted = JSON.stringify(parsed, null, 2);
                const html = this._syntaxHighlightJson(formatted);
                return '<pre style="padding:12px;font-family:var(--font-primary);font-size:0.9em;margin:0;overflow-x:auto;line-height:1.4">' + html + '</pre>';
            } catch (e) {
                return '<pre style="padding:12px;font-family:var(--font-primary);font-size:0.9em;margin:0;overflow-x:auto">' + this._escapeHtml(content.substring(0, 5000)) + '</pre>';
            }
        }

        if (type === 'code') {
            const lines = content.split('\n');
            const totalLines = lines.length;
            const maxLines = 150;
            const displayLines = lines.slice(0, maxLines);
            let html = '<table style="border-collapse:collapse;width:100%;font-family:var(--font-primary);font-size:0.85em;margin:0"><tbody>';
            displayLines.forEach((line, i) => {
                const lineNum = i + 1;
                const escaped = this._escapeHtml(line);
                html += '<tr><td style="color:var(--text-muted);padding:0 8px 0 4px;text-align:right;user-select:none;border-right:1px solid var(--border-color);vertical-align:top;width:40px">' + lineNum + '</td>';
                html += '<td style="padding:0 8px;white-space:pre;width:100%">' + (escaped || '&nbsp;') + '</td></tr>';
            });
            html += '</tbody></table>';
            if (totalLines > maxLines) {
                html += '<div style="color:var(--text-muted);padding:8px;border-top:1px solid var(--border-color)">(showing ' + maxLines + ' of ' + totalLines + ' lines)</div>';
            }
            return html;
        }

        if (type === 'image') {
            // VFS stores images as base64 strings — detect and render inline
            const isBase64 = /^[A-Za-z0-9+/=]+$/.test(content.substring(0, 100));
            if (isBase64) {
                const mimeTypes = {jpg:'image/jpeg',jpeg:'image/jpeg',png:'image/png',gif:'image/gif',webp:'image/webp',bmp:'image/bmp',ico:'image/x-icon'};
                const mime = mimeTypes[ext] || 'image/png';
                return '<div style="padding:12px;text-align:center;max-width:100%"><img src="data:' + mime + ';base64,' + content + '" style="max-width:100%;max-height:70vh;border-radius:4px;border:1px solid var(--border-color)" alt="' + this._escapeHtml(fileName) + '"></div>';
            }
            return '<div style="padding:20px;text-align:center;color:var(--text-muted)">📷 Image — cannot render, file may be stored as binary</div>';
        }

        if (type === 'svg') {
            try {
                const parser = new DOMParser();
                const doc = parser.parseFromString(content, 'text/html');
                const scripts = doc.querySelectorAll('script');
                scripts.forEach(s => s.remove());
                // Remove event handlers from svg elements
                const allEls = doc.querySelectorAll('*');
                allEls.forEach(el => {
                    for (let i = el.attributes.length - 1; i >= 0; i--) {
                        const attr = el.attributes[i].name;
                        if (attr.startsWith('on')) el.removeAttribute(attr);
                    }
                });
                const cleanSvg = doc.body.innerHTML;
                return '<div style="padding:12px;text-align:center;max-width:100%;overflow:auto">' + cleanSvg + '</div>';
            } catch (e) {
                return '<pre style="padding:12px;font-family:var(--font-primary);font-size:0.9em;overflow-x:auto">' + this._escapeHtml(content.substring(0, 5000)) + '</pre>';
            }
        }

        if (type === 'video') {
            const isBase64 = /^[A-Za-z0-9+/=]+$/.test(content.substring(0, 100));
            if (isBase64) {
                const mimeTypes = {mp4:'video/mp4',webm:'video/webm',avi:'video/x-msvideo',mov:'video/quicktime',mkv:'video/x-matroska'};
                const mime = mimeTypes[ext] || 'video/mp4';
                return '<div style="padding:12px;text-align:center"><video controls style="max-width:90%;max-height:65vh;border-radius:4px"><source src="data:' + mime + ';base64,' + content + '" type="' + mime + '"></video></div>';
            }
            return '<div style="padding:20px;text-align:center;color:var(--text-muted)">🎬 Video — cannot render</div>';
        }

        if (type === 'audio') {
            const isBase64 = /^[A-Za-z0-9+/=]+$/.test(content.substring(0, 100));
            if (isBase64) {
                const mimeTypes = {mp3:'audio/mpeg',wav:'audio/wav',ogg:'audio/ogg',flac:'audio/flac',aac:'audio/aac',m4a:'audio/mp4'};
                const mime = mimeTypes[ext] || 'audio/mpeg';
                return '<div style="padding:12px;text-align:center"><audio controls style="max-width:90%"><source src="data:' + mime + ';base64,' + content + '" type="' + mime + '"></audio></div>';
            }
            return '<div style="padding:20px;text-align:center;color:var(--text-muted)">🎵 Audio — cannot render</div>';
        }

        if (type === 'pdf') {
            const isBase64 = /^[A-Za-z0-9+/=]+$/.test(content.substring(0, 100));
            if (isBase64) {
                return '<div style="padding:12px;text-align:center;height:70vh"><embed src="data:application/pdf;base64,' + content + '" type="application/pdf" style="width:100%;height:100%;border:1px solid var(--border-color);border-radius:4px"></div>';
            }
            return '<div style="padding:20px;text-align:center;color:var(--text-muted)">📄 PDF — cannot render</div>';
        }

        if (type === 'csv') {
            try {
                const lines = content.split('\n').filter(l => l.trim());
                const maxRows = 50;
                const rows = lines.slice(0, maxRows).map(l => l.split(',').map(c => c.trim().replace(/^"|"$/g, '')));
                let html = '<table class="csv-table" style="border-collapse:collapse;width:100%;font-family:var(--font-primary);font-size:0.85em;margin:0;background:var(--bg-secondary)">';
                if (rows.length > 0) {
                    html += '<thead><tr>';
                    rows[0].forEach(cell => {
                        html += '<th style="border:1px solid var(--border-color);padding:6px 8px;text-align:left;background:var(--bg-tertiary);color:var(--accent-color);font-weight:bold">' + this._escapeHtml(cell) + '</th>';
                    });
                    html += '</tr></thead><tbody>';
                    rows.slice(1).forEach(row => {
                        html += '<tr>';
                        row.forEach(cell => {
                            html += '<td style="border:1px solid var(--border-color);padding:4px 8px">' + this._escapeHtml(cell) + '</td>';
                        });
                        html += '</tr>';
                    });
                    html += '</tbody></table>';
                    if (lines.length > maxRows) {
                        html += '<div style="color:var(--text-muted);padding:8px">(showing ' + maxRows + ' of ' + lines.length + ' rows)</div>';
                    }
                }
                return html;
            } catch (e) {
                return '<pre style="padding:12px;font-family:var(--font-primary);font-size:0.9em;overflow-x:auto">' + this._escapeHtml(content.substring(0, 5000)) + '</pre>';
            }
        }

        // 'other' — raw text fallback
        if (typeof content === 'string' && isTextContent) {
            const lines = content.split('\n');
            const maxLines = 80;
            const displayLines = lines.slice(0, maxLines);
            const truncated = lines.length > maxLines;
            let html = '<pre style="white-space:pre-wrap;padding:12px;font-family:var(--font-primary);font-size:0.9em;margin:0;overflow-x:auto">';
            displayLines.forEach((line, i) => {
                html += this._escapeHtml(line) + '\n';
            });
            html += '</pre>';
            if (truncated) {
                html += '<div style="color:var(--text-muted);padding:8px;border-top:1px solid var(--border-color)">(showing ' + maxLines + ' of ' + lines.length + ' lines)</div>';
            }
            return html;
        }

        return '<div style="padding:20px;text-align:center;color:var(--text-muted)">📁 Preview not available for this file type</div>';
    }

    _syntaxHighlightJson(jsonStr) {
        return jsonStr.replace(/("(?:\\.|[^"\\])*")\s*:/g, '<span style="color:var(--info-color)">$1</span>:')
            .replace(/:\s*("(?:\\.|[^"\\])*")/g, ': <span style="color:var(--success-color)">$1</span>')
            .replace(/:\s*(\d+\.?\d*)/g, ': <span style="color:var(--warning-color)">$1</span>')
            .replace(/:\s*(true|false|null)/g, ': <span style="color:var(--error-color)">$1</span>');
    }

    _escapeHtml(str) {
        if (typeof str !== 'string') return '';
        return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#039;');
    }

    _formatSize(size) {
        if (!size && size !== 0) return '';
        if (size < 1024) return size + ' B';
        if (size < 1024 * 1024) return (size / 1024).toFixed(1) + ' KB';
        return (size / (1024 * 1024)).toFixed(1) + ' MB';
    }

    _createOverlay() {
        if (this._overlay) return;

        const overlay = document.createElement('div');
        overlay.id = 'filemgr-overlay';
        overlay.style.cssText = 'position:fixed;inset:0;z-index:1800;display:flex;flex-direction:column;background:var(--bg-color);color:var(--text-color);font-family:var(--font-primary);font-size:14px;height:100vh;';

        // Inject responsive styles for the overlay
        const styleId = 'filemgr-styles';
        if (!document.getElementById(styleId)) {
            const style = document.createElement('style');
            style.id = styleId;
            style.textContent = `
                #filemgr-overlay.responsive .filemgr-main {
                    flex-direction: column !important;
                }
                #filemgr-overlay.responsive #filemgr-sidebar {
                    width: 100% !important;
                    max-height: 40vh;
                }
                #filemgr-overlay.responsive #filemgr-preview {
                    width: 100% !important;
                }
                #filemgr-overlay .filemgr-main {
                    display: flex;
                    flex: 1;
                    min-height: 0;
                }
                @media (max-width: 600px) {
                    #filemgr-overlay .filemgr-main {
                        flex-direction: column !important;
                    }
                    #filemgr-overlay #filemgr-sidebar {
                        width: 100% !important;
                        max-height: 40vh;
                        border-right: none !important;
                        border-bottom: 1px solid var(--border-color);
                    }
                #filemgr-overlay #filemgr-preview {
                    width: 100% !important;
                    flex: 1 !important;
                    min-height: 0;
                }
                    #filemgr-action-bar {
                        flex-wrap: wrap;
                        gap: 6px;
                    }
                    #filemgr-action-bar button {
                        min-width: 44px;
                        min-height: 44px;
                        font-size: 0.9em;
                    }
                }
            `;
            document.head.appendChild(style);
        }

        // Toolbar
        const toolbar = document.createElement('div');
        toolbar.style.cssText = 'display:flex;align-items:center;padding:8px 12px;border-bottom:1px solid var(--border-color);background:var(--bg-secondary);flex-shrink:0;gap:8px;flex-wrap:wrap;';

        const closeBtn = document.createElement('button');
        closeBtn.textContent = '✕';
        closeBtn.style.cssText = 'background:none;border:1px solid var(--border-color);color:var(--text-color);cursor:pointer;padding:4px 10px;border-radius:4px;font-family:inherit;font-size:1em;min-height:44px;touch-action:manipulation;';
        closeBtn.onclick = () => this._closeOverlay();
        toolbar.appendChild(closeBtn);

        const titleSpan = document.createElement('span');
        titleSpan.textContent = '📁 File Manager';
        titleSpan.style.cssText = 'font-weight:bold;margin-right:8px;';
        toolbar.appendChild(titleSpan);

        // Breadcrumbs
        const breadcrumbs = document.createElement('div');
        breadcrumbs.style.cssText = 'display:flex;align-items:center;gap:4px;flex-wrap:wrap;font-size:0.9em;';
        breadcrumbs.id = 'filemgr-breadcrumbs';

        // Root breadcrumb
        const rootSeg = document.createElement('span');
        rootSeg.textContent = '/';
        rootSeg.style.cssText = 'color:var(--accent-color);cursor:pointer;padding:2px 4px;border-radius:3px;';
        rootSeg.onmouseenter = () => { rootSeg.style.background = 'var(--bg-tertiary)'; };
        rootSeg.onmouseleave = () => { rootSeg.style.background = 'transparent'; };
        rootSeg.onclick = () => this._navigateTo([]);
        breadcrumbs.appendChild(rootSeg);

        toolbar.appendChild(breadcrumbs);

        // Search input
        const searchInput = document.createElement('input');
        searchInput.type = 'text';
        searchInput.placeholder = '🔍 Filter files...';
        searchInput.style.cssText = 'flex:1;min-width:120px;max-width:300px;padding:6px 10px;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:4px;color:var(--text-color);font-family:var(--font-primary);font-size:0.9em;outline:none;';
        searchInput.oninput = (e) => {
            this._searchFilter = e.target.value.toLowerCase();
            this._refreshFileList();
        };
        toolbar.appendChild(searchInput);

        // v4.5.78: Batch operation buttons
        const batchBar = document.createElement('div');
        batchBar.style.cssText = 'display:flex;align-items:center;gap:4px;flex-wrap:wrap;';
        const mkBtn = (label, title, action) => {
            const b = document.createElement('button');
            b.textContent = label;
            b.title = title;
            b.style.cssText = 'background:none;border:1px solid var(--border-color);color:var(--text-color);cursor:pointer;padding:4px 8px;border-radius:4px;font-family:inherit;font-size:0.85em;min-height:32px;touch-action:manipulation;';
            b.onclick = () => action();
            return b;
        };
        batchBar.appendChild(mkBtn('📋 Copy', 'Copy selected files', () => this._batchCopy()));
        batchBar.appendChild(mkBtn('✂️ Cut', 'Cut selected files', () => this._batchCut()));
        batchBar.appendChild(mkBtn('📥 Paste', 'Paste from clipboard', () => this._batchPaste()));
        batchBar.appendChild(mkBtn('🗑️ Del', 'Delete selected files', () => this._batchDelete()));
        batchBar.appendChild(mkBtn('📝 Rename', 'Rename selected file', () => this._batchRename()));
        batchBar.appendChild(mkBtn('☐ All', 'Toggle select all', () => this._toggleSelectAll()));
        // v4.6.35: tap-to-select mode — the only usable multi-select path on touch devices
        const selModeBtn = mkBtn('☑ Select', 'Toggle tap-to-select mode (touch)', () => {
            this._selectMode = !this._selectMode;
            selModeBtn.style.background = this._selectMode ? 'var(--accent-color)' : 'none';
            selModeBtn.style.color = this._selectMode ? '#fff' : 'var(--text-color)';
            this._updateStatus(this._selectMode ? 'Select mode ON — tap rows to select' : 'Select mode OFF');
        });
        selModeBtn.setAttribute('aria-pressed', 'false');
        batchBar.appendChild(selModeBtn);
        toolbar.appendChild(batchBar);

        // 2026-10-21: publish a VFS file to the user's WebDAV space was terminal-only.
        const wdavBtn = document.createElement('button');
        wdavBtn.textContent = '☁ WebDAV';
        wdavBtn.title = 'Upload the selected/current file to your WebDAV space and get its public link';
        wdavBtn.style.cssText = 'background:var(--bg-tertiary);border:1px solid var(--border-color);' +
            'color:var(--text-color);cursor:pointer;padding:4px 10px;border-radius:4px;' +
            'font-family:inherit;font-size:0.9em;min-height:32px;touch-action:manipulation;';
        wdavBtn.onclick = () => this._uploadSelectionToWebdav();
        toolbar.appendChild(wdavBtn);

        overlay.appendChild(toolbar);

        // Main area — wraps sidebar + preview in a responsive flex container
        const mainArea = document.createElement('div');
        mainArea.id = 'filemgr-main-container';
        mainArea.className = 'filemgr-main';
        mainArea.style.cssText = 'flex:1;overflow:hidden;display:flex;min-height:0;';

        // Sidebar
        const sidebar = document.createElement('div');
        sidebar.id = 'filemgr-sidebar';
        sidebar.style.cssText = 'width:25%;min-width:150px;overflow-y:auto;background:var(--bg-secondary);border-right:1px solid var(--border-color);';

        mainArea.appendChild(sidebar);

        // Preview pane
        const preview = document.createElement('div');
        preview.id = 'filemgr-preview';
        preview.style.cssText = 'flex:1;overflow-y:auto;padding:0;';

        mainArea.appendChild(preview);

        overlay.appendChild(mainArea);

        // Action bar
        const actionBar = document.createElement('div');
        actionBar.id = 'filemgr-action-bar';
        actionBar.style.cssText = 'display:flex;align-items:center;padding:8px 12px;border-top:1px solid var(--border-color);background:var(--bg-secondary);flex-shrink:0;gap:8px;flex-wrap:wrap;';

        const statusSpan = document.createElement('span');
        statusSpan.id = 'filemgr-status';
        statusSpan.style.cssText = 'flex:1;color:var(--text-muted);font-size:0.85em;';
        statusSpan.textContent = 'No file selected';
        actionBar.appendChild(statusSpan);

        const encryptBtn = document.createElement('button');
        encryptBtn.textContent = '🔐 Encrypt';
        encryptBtn.style.cssText = 'padding:6px 14px;background:var(--bg-tertiary);border:1px solid var(--warning-color);color:var(--warning-color);border-radius:4px;cursor:pointer;font-family:inherit;font-size:0.9em;min-height:44px;touch-action:manipulation;';
        encryptBtn.onclick = () => this._actionEncrypt();
        actionBar.appendChild(encryptBtn);

        const compressBtn = document.createElement('button');
        compressBtn.textContent = '📦 Zip';
        compressBtn.style.cssText = 'padding:6px 14px;background:var(--bg-tertiary);border:1px solid var(--info-color);color:var(--info-color);border-radius:4px;cursor:pointer;font-family:inherit;font-size:0.9em;min-height:44px;touch-action:manipulation;';
        compressBtn.onclick = () => this._actionCompress();
        actionBar.appendChild(compressBtn);

        const deleteBtn = document.createElement('button');
        deleteBtn.textContent = '🗑 Delete';
        deleteBtn.style.cssText = 'padding:6px 14px;background:var(--bg-tertiary);border:1px solid var(--error-color);color:var(--error-color);border-radius:4px;cursor:pointer;font-family:inherit;font-size:0.9em;min-height:44px;touch-action:manipulation;';
        deleteBtn.onclick = () => this._actionDelete();
        actionBar.appendChild(deleteBtn);

        const downloadBtn = document.createElement('button');
        downloadBtn.textContent = '⬇ Download';
        downloadBtn.style.cssText = 'padding:6px 14px;background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-color);border-radius:4px;cursor:pointer;font-family:inherit;font-size:0.9em;min-height:44px;touch-action:manipulation;';
        downloadBtn.onclick = () => this._actionDownload();
        actionBar.appendChild(downloadBtn);

        const editBtn = document.createElement('button');
        editBtn.textContent = '✏ Edit';
        editBtn.style.cssText = 'padding:6px 14px;background:var(--bg-tertiary);border:1px solid var(--accent-color);color:var(--accent-color);border-radius:4px;cursor:pointer;font-family:inherit;font-size:0.9em;min-height:44px;touch-action:manipulation;';
        editBtn.onclick = () => this._actionEdit();
        actionBar.appendChild(editBtn);

        const newFileBtn = document.createElement('button');
        newFileBtn.textContent = '📄 New';
        newFileBtn.style.cssText = 'padding:6px 14px;background:var(--bg-tertiary);border:1px solid var(--success-color);color:var(--success-color);border-radius:4px;cursor:pointer;font-family:inherit;font-size:0.9em;min-height:44px;touch-action:manipulation;';
        newFileBtn.onclick = () => this._actionNewFile();
        actionBar.appendChild(newFileBtn);

        const previewToggleBtn = document.createElement('button');
        previewToggleBtn.id = 'filemgr-toggle-raw';
        previewToggleBtn.textContent = '📄 Raw';
        previewToggleBtn.style.cssText = 'padding:6px 14px;background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-muted);border-radius:4px;cursor:pointer;font-family:inherit;font-size:0.9em;min-height:44px;touch-action:manipulation;';
        previewToggleBtn.onclick = () => this._togglePreviewMode();
        actionBar.appendChild(previewToggleBtn);

        overlay.appendChild(actionBar);

        this._overlay = overlay;
        return overlay;
    }

    _openOverlay() {
        if (this._overlay) {
            this._overlay.style.display = 'flex';
            this._refreshFileList();
            return;
        }
        const overlay = this._createOverlay();
        document.body.appendChild(overlay);
        this._navigateTo(this.currentPath);
    }

    _closeOverlay() {
        if (this._overlay) {
            this._overlay.style.display = 'none';
        }
        this._multiSelect.clear();
        this._selectedFile = null;
        this._selectMode = false;
    }

    _clearOverlay() {
        if (this._overlay && this._overlay.parentNode) {
            this._overlay.parentNode.removeChild(this._overlay);
        }
        this._overlay = null;
        this._selectedFile = null;
        this._multiSelect.clear();
        this._selectMode = false;
        this._searchFilter = '';
        this._rawMode = false;
    }

    _navigateTo(pathParts) {
        this.currentPath = pathParts || [];
        this._selectedFile = null;
        this._multiSelect.clear();
        this._searchFilter = '';
        const searchInput = this._overlay?.querySelector('input[type="text"]');
        if (searchInput) searchInput.value = '';
        this._updateBreadcrumbs();
        this._refreshFileList();
        this._clearPreview();
        this._updateStatus('No file selected');
    }

    _updateBreadcrumbs() {
        const breadcrumbs = document.getElementById('filemgr-breadcrumbs');
        if (!breadcrumbs) return;

        // Keep root segment, remove rest
        while (breadcrumbs.children.length > 1) {
            breadcrumbs.removeChild(breadcrumbs.lastChild);
        }

        let accumulated = '';
        this.currentPath.forEach((part, i) => {
            const sep = document.createElement('span');
            sep.textContent = ' › ';
            sep.style.cssText = 'color:var(--text-muted);margin:0 2px;';
            breadcrumbs.appendChild(sep);

            const seg = document.createElement('span');
            seg.textContent = part;
            seg.style.cssText = 'cursor:pointer;padding:2px 4px;border-radius:3px;color:var(--text-color);';
            if (i === this.currentPath.length - 1) {
                seg.style.color = 'var(--accent-color)';
                seg.style.fontWeight = 'bold';
            }
            seg.onmouseenter = () => { seg.style.background = 'var(--bg-tertiary)'; };
            seg.onmouseleave = () => { seg.style.background = 'transparent'; };
            const pathUpTo = this.currentPath.slice(0, i + 1);
            seg.onclick = () => this._navigateTo(pathUpTo);
            breadcrumbs.appendChild(seg);
        });
    }

    _refreshFileList() {
        const sidebar = document.getElementById('filemgr-sidebar');
        if (!sidebar) return;

        // Read directory
        const pathStr = '/' + this.currentPath.join('/');
        const entries = this.terminal.fs.ls(pathStr) || [];

        // Separate dirs and files
        const dirs = entries.filter(e => e.type === 'dir');
        const files = entries.filter(e => e.type !== 'dir');

        // Prune selections that no longer exist here (deleted/moved elsewhere)
        try {
            const _live = new Set();
            entries.forEach(e => _live.add(pathStr === '/' ? '/' + e.name : pathStr + '/' + e.name));
            [...this._multiSelect].forEach(p => { if (!_live.has(p)) this._multiSelect.delete(p); });
        } catch (_e) {}

        // Sort alphabetically
        dirs.sort((a, b) => a.name.localeCompare(b.name));
        files.sort((a, b) => a.name.localeCompare(b.name));

        // Apply search filter
        let filteredDirs = dirs;
        let filteredFiles = files;
        if (this._searchFilter) {
            const q = this._searchFilter;
            filteredDirs = dirs.filter(e => e.name.toLowerCase().includes(q));
            filteredFiles = files.filter(e => e.name.toLowerCase().includes(q));
        }

        const _scrollTop = sidebar.scrollTop;
        sidebar.innerHTML = '';

        if (filteredDirs.length === 0 && filteredFiles.length === 0) {
            const emptyMsg = document.createElement('div');
            emptyMsg.style.cssText = 'padding:20px;text-align:center;color:var(--text-muted);';
            emptyMsg.textContent = this._searchFilter ? 'No matching files' : '(empty)';
            sidebar.appendChild(emptyMsg);
            this._itemCount = 0;
            this._updateSelectionStatus();
            return;
        }

        // Add directory items
        filteredDirs.forEach(entry => {
            const item = document.createElement('div');
            const fullPath = pathStr === '/' ? '/' + entry.name : pathStr + '/' + entry.name;
            item.dataset.path = fullPath;
            item.dataset.type = 'dir';
            item.style.cssText = 'display:flex;align-items:center;padding:6px 10px;cursor:pointer;border-bottom:1px solid var(--border-color);gap:6px;border-left:3px solid transparent;';
            item.onmouseenter = () => { if (!item.dataset.selected) item.style.background = 'var(--bg-tertiary)'; };
            item.onmouseleave = () => { if (!item.dataset.selected) item.style.background = 'transparent'; };
            item.onclick = (e) => {
                if (e.ctrlKey || e.metaKey || this._selectMode) { e.preventDefault(); this._toggleMulti(fullPath); return; }
                const newPath = [...this.currentPath, entry.name];
                this._navigateTo(newPath);
            };

            item.appendChild(this._makeCheckbox(fullPath, entry.name + '/'));

            const icon = document.createElement('span');
            icon.textContent = '📁';
            item.appendChild(icon);

            const nameSpan = document.createElement('span');
            nameSpan.textContent = entry.name + '/';
            nameSpan.style.cssText = 'flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;';
            item.appendChild(nameSpan);

            sidebar.appendChild(item);
        });

        // Add file items
        filteredFiles.forEach(entry => {
            const item = document.createElement('div');
            const fullPath = pathStr === '/' ? '/' + entry.name : pathStr + '/' + entry.name;
            const isSelected = this._selectedFile === fullPath;
            const isMulti = this._multiSelect.has(fullPath);
            item.dataset.path = fullPath;
            item.dataset.type = 'file';
            item.dataset.selected = (isSelected || isMulti) ? 'true' : 'false';
            const bgColor = isMulti ? 'var(--bg-tertiary)' : 'transparent';
            item.style.cssText = 'display:flex;align-items:center;padding:6px 10px;cursor:pointer;border-bottom:1px solid var(--border-color);gap:6px;background:' + bgColor + ';border-left:3px solid ' + (isSelected ? 'var(--accent-color)' : 'transparent') + ';';
            item.onmouseenter = () => { if (!item.dataset.selected) item.style.background = 'var(--bg-tertiary)'; };
            item.onmouseleave = () => { if (!item.dataset.selected) item.style.background = 'transparent'; };
            item.onclick = (e) => {
                // Ctrl/Cmd or Select-mode → toggle in the batch set (no full re-render)
                if (e.ctrlKey || e.metaKey || this._selectMode) { e.preventDefault(); this._toggleMulti(fullPath); return; }
                // Plain click → preview AND make it the single selected item
                this._multiSelect.clear();
                this._multiSelect.add(fullPath);
                this._selectedFile = fullPath;
                this._highlightSelected();
                this._renderPreview(fullPath, this.terminal.fs.readFile(fullPath));
                this._updateSelectionStatus();
            };

            item.appendChild(this._makeCheckbox(fullPath, entry.name));

            const icon = document.createElement('span');
            icon.textContent = '📄';
            item.appendChild(icon);

            const nameSpan = document.createElement('span');
            nameSpan.textContent = entry.name;
            nameSpan.style.cssText = 'flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;';
            item.appendChild(nameSpan);

            const sizeSpan = document.createElement('span');
            sizeSpan.textContent = this._formatSize(entry.size);
            sizeSpan.style.cssText = 'color:var(--text-muted);font-size:0.8em;white-space:nowrap;margin-left:4px;';
            item.appendChild(sizeSpan);

            sidebar.appendChild(item);
        });

        this._itemCount = filteredDirs.length + filteredFiles.length;
        sidebar.scrollTop = _scrollTop;
        this._highlightSelected();
        this._updateSelectionStatus();
    }

    _makeCheckbox(path, label) {
        const cb = document.createElement('input');
        cb.type = 'checkbox';
        cb.checked = this._multiSelect.has(path);
        cb.setAttribute('aria-label', 'Select ' + label);
        cb.style.cssText = 'width:20px;height:20px;min-width:20px;margin:0 6px 0 0;accent-color:var(--accent-color);cursor:pointer;touch-action:manipulation;';
        cb.onclick = (e) => e.stopPropagation();
        cb.onchange = () => this._toggleMulti(path);
        return cb;
    }

    _toggleMulti(path) {
        if (this._multiSelect.has(path)) this._multiSelect.delete(path);
        else this._multiSelect.add(path);
        this._highlightSelected();
        this._updateSelectionStatus();
    }

    _updateSelectionStatus() {
        const n = this._multiSelect.size;
        if (n) { this._updateStatus(n + ' selected'); return; }
        if (this._selectedFile) { this._updateStatus('Preview: ' + this._selectedFile.split('/').pop()); return; }
        const total = this._itemCount || 0;
        this._updateStatus(total + ' item' + (total === 1 ? '' : 's'));
    }

    _exists(path) {
        const fs = this.terminal.fs;
        try {
            if (fs.readFile(path) !== null) return true;
            if (typeof fs.readDir === 'function' && fs.readDir(path) !== null) return true;
            if (typeof fs.stat === 'function' && fs.stat(path)) return true;
        } catch (_e) {}
        return false;
    }

    _highlightSelected() {
        const sidebar = document.getElementById('filemgr-sidebar');
        if (!sidebar) return;
        const items = sidebar.querySelectorAll('[data-path]');
        items.forEach(item => {
            const path = item.dataset.path;
            const inBatch = this._multiSelect.has(path);
            const preview = this._selectedFile === path;
            item.dataset.selected = (inBatch || preview) ? 'true' : 'false';
            item.style.background = inBatch ? 'var(--bg-tertiary)' : 'transparent';
            item.style.borderLeft = '3px solid ' + (preview ? 'var(--accent-color)' : 'transparent');
            const cb = item.querySelector('input[type="checkbox"]');
            if (cb) cb.checked = inBatch;
        });
    }

    // v4.5.78: Batch operations
    _getSelectedPaths() {
        return [...this._multiSelect];
    }

    _batchCopy() {
        const paths = this._getSelectedPaths();
        if (!paths.length) { this._updateStatus('No files selected'); return; }
        this._clipboard = { mode: 'copy', paths: [...paths] };
        this._updateStatus('📋 Copied ' + paths.length + ' item(s)');
    }

    _batchCut() {
        const paths = this._getSelectedPaths();
        if (!paths.length) { this._updateStatus('No files selected'); return; }
        this._clipboard = { mode: 'cut', paths: [...paths] };
        this._updateStatus('✂️ Cut ' + paths.length + ' item(s)');
    }

    _batchPaste() {
        if (!this._clipboard || !this._clipboard.paths.length) { this._updateStatus('Clipboard empty'); return; }
        const fs = this.terminal.fs;
        const dest = this.currentPath.length ? '/' + this.currentPath.join('/') : '/';
        let count = 0, skipped = 0;
        const failed = [];
        this._clipboard.paths.forEach(src => {
            const name = src.split('/').pop();
            const destPath = dest === '/' ? '/' + name : dest + '/' + name;
            if (destPath === src || destPath.startsWith(src + '/')) { skipped++; return; }
            // Directory → existing directory would REPLACE the whole subtree silently; skip it.
            let srcIsDir = false;
            try { srcIsDir = typeof fs.readDir === 'function' && fs.readDir(src) !== null; } catch (_e) {}
            if (this._exists(destPath) && srcIsDir) { skipped++; return; }
            if (this._exists(destPath) && !confirm('Overwrite ' + destPath + '?')) { skipped++; return; }
            try {
                const ok = this._clipboard.mode === 'copy' ? fs.copy(src, destPath) : fs.move(src, destPath);
                if (ok) count++; else failed.push(src);
            } catch (_e) { failed.push(src); }
        });
        if (this._clipboard.mode === 'cut') {
            this._clipboard = failed.length ? { mode: 'cut', paths: failed } : { mode: null, paths: [] };
        }
        this._multiSelect.clear();
        this._selectedFile = null;
        this._refreshFileList();
        this._updateStatus('📥 Pasted ' + count + ' item(s)' + (skipped ? ' — ' + skipped + ' skipped' : '') + (failed.length ? ' — ' + failed.length + ' failed' : ''));
    }

    _batchDelete() {
        const paths = this._getSelectedPaths();
        if (!paths.length) { this._updateStatus('No files selected'); return false; }
        if (!confirm('Delete ' + paths.length + ' item(s)?')) return false;
        const fs = this.terminal.fs;
        let count = 0, failed = 0;
        paths.forEach(p => {
            try {
                const ok = typeof fs.rm === 'function' ? fs.rm(p) : fs.deleteFile(p);
                if (ok) count++; else failed++;
            } catch (_e) { failed++; }
        });
        this._multiSelect.clear();
        this._selectedFile = null;
        this._refreshFileList();
        this._updateStatus('🗑️ Deleted ' + count + ' item(s)' + (failed ? ' — ' + failed + ' failed' : ''));
        return count > 0;
    }

    _batchRename() {
        const paths = this._getSelectedPaths();
        if (!paths.length) { this._updateStatus('No item selected'); return; }
        const fs = this.terminal.fs;
        if (paths.length === 1) {
            const path = paths[0];
            const oldName = path.split('/').pop();
            const newName = (prompt('Rename to:', oldName) || '').trim();
            if (!newName || newName === oldName) return;
            if (newName === '.' || newName === '..' || newName.includes('/') || newName.includes('\\')) {
                this._updateStatus('❌ Invalid file name'); return;
            }
            const dir = path.substring(0, path.lastIndexOf('/')) || '/';
            const newPath = dir === '/' ? '/' + newName : dir + '/' + newName;
            if (this._exists(newPath)) { this._updateStatus('⚠ Destination already exists'); return; }
            if (!fs.rename(path, newPath)) { this._updateStatus('❌ Rename failed'); return; }
            this._selectedFile = newPath;
            this._multiSelect.clear();
            this._multiSelect.add(newPath);
            this._refreshFileList();
            this._updateStatus('📝 Renamed to ' + newName);
            return;
        }
        const prefix = (prompt('Rename ' + paths.length + ' items — new prefix:', 'file') || '').trim();
        if (!prefix) return;
        let i = 0, ok = 0, skip = 0;
        paths.forEach(p => {
            const ext = (p.match(/\.[^./]+$/) || [''])[0];
            const dir = p.substring(0, p.lastIndexOf('/')) || '/';
            const dest = (dir === '/' ? '' : dir) + '/' + prefix + (++i) + ext;
            if (dest === p || this._exists(dest)) { skip++; return; }
            try { if (fs.rename(p, dest)) ok++; else skip++; } catch (_e) { skip++; }
        });
        this._multiSelect.clear();
        this._selectedFile = null;
        this._refreshFileList();
        this._updateStatus('📝 Renamed ' + ok + ' item(s)' + (skip ? ' — ' + skip + ' skipped' : ''));
    }

    _toggleSelectAll() {
        const sidebar = document.getElementById('filemgr-sidebar');
        if (!sidebar) return;
        const paths = [...sidebar.querySelectorAll('[data-path]')].map(i => i.dataset.path);
        if (!paths.length) { this._updateSelectionStatus(); return; }
        const all = paths.every(p => this._multiSelect.has(p));
        if (all) {
            paths.forEach(p => this._multiSelect.delete(p));
            if (this._selectedFile && paths.includes(this._selectedFile)) this._selectedFile = null;
        } else {
            paths.forEach(p => this._multiSelect.add(p));
        }
        this._refreshFileList();
    }

    _renderPreview(path, content) {
        const preview = document.getElementById('filemgr-preview');
        if (!preview) return;

        // Re-read content on each preview call
        if (content === undefined) {
            content = this.terminal.fs.readFile(path);
        }

        // For raw mode, show raw text regardless of type
        if (this._rawMode && typeof content === 'string') {
            preview.innerHTML = this._previewShell(path, '<div style="padding:12px"><div style="color:var(--text-muted);font-size:0.85em;margin-bottom:8px">RAW: ' + this._escapeHtml(path) + '</div><pre style="white-space:pre-wrap;font-family:var(--font-primary);font-size:0.9em;margin:0;overflow-x:auto">' + this._escapeHtml(content.substring(0, 10000)) + '</pre></div>');
            this._wirePreviewToolbar(path);
            this._updateStatus('Preview: ' + path);
            return;
        }

        // Check file size for text files
        const type = this._detectType(path);
        const textTypes = ['md', 'text', 'json', 'code', 'csv', 'other'];
        if (textTypes.includes(type) && typeof content === 'string' && content.length > 51200) {
            content = content.substring(0, 51200);
            preview.innerHTML = this._previewShell(path,
                this._getPreviewHtml(path, content) +
                '<div style="color:var(--warning-color);padding:8px 12px;border-top:1px solid var(--border-color);font-size:0.85em;">(truncated — file exceeds 50KB)</div>');
            this._wirePreviewToolbar(path);
            this._updateStatus('Preview: ' + path);
            return;
        }

        preview.innerHTML = this._previewShell(path, this._getPreviewHtml(path, content));
        this._wirePreviewToolbar(path);
        this._updateStatus('Preview: ' + path);
    }

    // 2026-10-21: preview pane had no fullscreen and no share action.
    _previewShell(path, innerHtml) {
        return '<div class="fm-preview-toolbar" style="display:flex;gap:6px;justify-content:flex-end;' +
               'padding:6px 8px;border-bottom:1px solid var(--border-color);flex-shrink:0">' +
               '<button class="fm-btn-fs" title="Fullscreen preview" aria-label="Fullscreen preview" style="background:var(--bg-tertiary);' +
               'border:1px solid var(--border-color);color:var(--text-color);padding:2px 8px;border-radius:4px;' +
               'cursor:pointer;font-size:0.85em;min-height:24px;">⛶</button>' +
               '<button class="fm-btn-share" title="Copy share link" aria-label="Copy share link" style="background:var(--bg-tertiary);' +
               'border:1px solid var(--border-color);color:var(--text-color);padding:2px 8px;border-radius:4px;' +
               'cursor:pointer;font-size:0.85em;min-height:24px;">🔗</button>' +
               '</div><div class="fm-preview-body" style="flex:1;min-height:0;overflow:auto">' + innerHtml + '</div>';
    }

    _previewShareUrl(path) {
        const wdav = this.terminal && this.terminal.moduleManager && this.terminal.moduleManager.modules
            ? this.terminal.moduleManager.modules.WebDAVModule : null;
        const space = (wdav && wdav._resolveSpaceName && wdav._resolveSpaceName()) || '';
        const clean = String(path).replace(/^\/+/, '');
        return 'https://webx11.duckdns.org/spaces/' + space + '/' +
            clean.split('/').map(encodeURIComponent).join('/');
    }

    // 2026-10-21: publish VFS file(s) to WebDAV (was terminal-only: webdav-push)
    async _uploadSelectionToWebdav() {
        let targets = this._getSelectedPaths ? this._getSelectedPaths() : [];
        if (!targets || !targets.length) targets = this._selectedFile ? [this._selectedFile] : [];
        if (!targets.length) { this._updateStatus('☁ Select a file first'); return; }
        const wdav = this.terminal && this.terminal.moduleManager && this.terminal.moduleManager.modules
            ? this.terminal.moduleManager.modules.WebDAVModule : null;
        if (!wdav) { this._updateStatus('☁ WebDAV module not loaded'); return; }
        if (!wdav.config || !wdav.config.url) { try { await wdav._autoBootstrap(); } catch (e) {} }
        if (!wdav.config || !wdav.config.url) { this._updateStatus('☁ WebDAV not configured — run webdav-config'); return; }
        for (const p of targets) {
            const clean = String(p).replace(/^\/+/, '');
            try {
                await this.terminal.security.checkAndRun('webdav-push ' + clean);
                const shareUrl = this._previewShareUrl(clean);
                this._updateStatus('☁ Uploaded ' + clean + ' → ' + shareUrl);
                if (this.terminal.print) this.terminal.print('☁ WebDAV: ' + shareUrl, 'success');
            } catch (e) {
                this._updateStatus('☁ Upload failed: ' + (e && e.message ? e.message : e));
            }
        }
    }

    _wirePreviewToolbar(path) {
        const pane = document.getElementById('filemgr-preview');
        if (!pane) return;
        const fsBtn = pane.querySelector('.fm-btn-fs');
        const shBtn = pane.querySelector('.fm-btn-share');
        if (fsBtn) fsBtn.onclick = () => {
            const body = pane.querySelector('.fm-preview-body') || pane;
            if (document.fullscreenElement) { document.exitFullscreen(); return; }
            if (body.requestFullscreen) body.requestFullscreen().catch(() => this._updateStatus('⛶ Fullscreen blocked by this browser'));
            else if (body.webkitRequestFullscreen) body.webkitRequestFullscreen();
            else this._updateStatus('⛶ Fullscreen not supported here');
        };
        if (shBtn) shBtn.onclick = () => {
            const url = this._previewShareUrl(path);
            if (navigator.clipboard && navigator.clipboard.writeText) {
                navigator.clipboard.writeText(url)
                    .then(() => this._updateStatus('🔗 Link copied: ' + url))
                    .catch(() => prompt('Copy share link:', url));
            } else {
                prompt('Copy share link:', url);
            }
        };
    }

    _renderPreviewError(msg) {
        const preview = document.getElementById('filemgr-preview');
        if (!preview) return;
        preview.innerHTML = '<div style="color:var(--error-color);padding:20px;font-size:1em">' + this._escapeHtml(msg) + '</div>';
        this._updateStatus('Error');
    }

    _clearPreview() {
        const preview = document.getElementById('filemgr-preview');
        if (preview) preview.innerHTML = '';
    }

    _updateStatus(msg) {
        const status = document.getElementById('filemgr-status');
        if (status) status.textContent = msg;
    }

    _actionDelete() {
        // Delegate to the batch path so checkbox selections are honoured, not just the previewed file.
        if (!this._getSelectedPaths().length && this._selectedFile) {
            this._multiSelect.add(this._selectedFile);
        }
        // Only clear the preview when something was actually deleted (not on cancel).
        if (this._batchDelete()) this._clearPreview();
    }

    _actionDownload() {
        if (!this._selectedFile) {
            this._updateStatus('No file selected to download');
            return;
        }
        const content = this.terminal.fs.readFile(this._selectedFile);
        if (content === null || content === false) {
            this._updateStatus('❌ File not found');
            return;
        }
        const fileName = this._selectedFile.split('/').pop() || 'file';
        const blob = new Blob([content], { type: 'application/octet-stream' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = fileName;
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        URL.revokeObjectURL(url);
        this._updateStatus('⬇ Downloaded: ' + fileName);
    }

    _actionEdit() {
        if (!this._selectedFile) {
            this._updateStatus('No file selected to edit');
            return;
        }
        const path = this._selectedFile;
        // Close file manager first so code editor modal (z-index:1000) is visible above
        this._closeOverlay();
        if (typeof webx11 !== 'undefined' && webx11 && webx11.dispatchCommand) {
            setTimeout(() => {
                webx11.dispatchCommand('edit', [path]);
            }, 100);
            this._updateStatus('✏ Opened in editor: ' + path);
        } else {
            this._updateStatus('❌ Editor not available');
        }
    }

    _togglePreviewMode() {
        this._rawMode = !this._rawMode;
        const btn = document.getElementById('filemgr-toggle-raw');
        if (btn) {
            btn.textContent = this._rawMode ? '📄 Rendered' : '📄 Raw';
            btn.style.borderColor = this._rawMode ? 'var(--accent-color)' : 'var(--border-color)';
            btn.style.color = this._rawMode ? 'var(--accent-color)' : 'var(--text-muted)';
        }
        if (this._selectedFile) {
            const content = this.terminal.fs.readFile(this._selectedFile);
            this._renderPreview(this._selectedFile, content);
        }
    }

    _actionEncrypt() {
        if (!this._selectedFile) {
            this._updateStatus('No file selected');
            return;
        }
        if (this._selectedFile.endsWith('.enc')) {
            this._updateStatus('⚠ Already encrypted (.enc)');
            return;
        }
        const passphrase = prompt('Enter passphrase for AES-256-GCM encryption:');
        if (!passphrase || passphrase.length < 4) {
            this._updateStatus('❌ Passphrase too short (min 4 chars)');
            return;
        }
        // Delegate to cryptogzip module's encrypt command
        if (typeof webx11 !== 'undefined' && webx11.executeCommand) {
            webx11.executeCommand('encrypt ' + this._selectedFile + ' ' + passphrase);
            this._updateStatus('🔐 Encrypted: ' + this._selectedFile + '.enc');
            this._refreshFileList();
        }
    }

    _actionCompress() {
        if (!this._selectedFile) {
            this._updateStatus('No file selected');
            return;
        }
        if (this._selectedFile.endsWith('.gz')) {
            this._updateStatus('⚠ Already compressed (.gz)');
            return;
        }
        if (typeof webx11 !== 'undefined' && webx11.executeCommand) {
            webx11.executeCommand('gzip ' + this._selectedFile);
            this._updateStatus('📦 Compressed: ' + this._selectedFile + '.gz');
            this._refreshFileList();
        }
    }

    _actionNewFile() {
        const name = prompt('New file name (e.g. myfile.txt):');
        if (!name) return;
        const pathStr = '/' + this.currentPath.join('/');
        const cleanPath = pathStr === '/' ? '/' + name : pathStr + '/' + name;
        const content = prompt('Enter file content (optional):') || '';
        const ok = this.terminal.fs.writeFile(cleanPath, content);
        if (ok) {
            this._updateStatus('✅ Created: ' + cleanPath + ' (' + content.length + ' chars)');
            this._refreshFileList();
        } else {
            this._updateStatus('❌ Failed to create file');
        }
    }
}

if (typeof window.webx11 !== 'undefined' && window.webx11) {
    webx11.moduleManager.registerModule(new FileManagerModule(), 'https://webx11.duckdns.org/spaces/newos4/modules/ext/filemgr.js');
}