class EditorModule {
    constructor() {
        this.commands = {};
        this.terminal = null;
        this._vfsPath = null;
    }

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

    getHelpInfo() {
        return {
            'edit': 'Open the code editor for a VFS file (usage: edit <path>)',
        };
    }
    
    registerCommands() {
        this.commands['edit'] = (args) => this.edit(args);
    }
    edit(args) {
        if (!args[0]) return this.terminal.print('Usage: edit <path>', 'warning');
        const path = args.join(' ');
        const modal = document.getElementById('code-editor');
        const title = document.getElementById('code-editor-title');
        const textarea = document.getElementById('code-editor-textarea');
        const gutter = document.getElementById('code-editor-gutter');
        const statusEl = document.getElementById('code-editor-status');
        if (!modal || !textarea) return this.terminal.print('Editor modal not found', 'error');
        // Read existing file content or use empty for new files
        const content = this.terminal.fs.readFile(path);
        const fileContent = (content !== null && content !== false) ? content : '';
        // Set up modal
        this._vfsPath = path;
        title.textContent = '📝 Editing: ' + path;
        textarea.value = fileContent;
        modal.style.display = 'flex';
        textarea.focus();
        // Editor enhancements: line numbers, Tab, Ctrl+S
        const updateGutter = () => {
            const lines = textarea.value.split('\n').length;
            let html = '';
            for (let i = 1; i <= lines; i++) html += i + '\n';
            gutter.textContent = '';
            gutter.textContent = html;
        };
        const syncScroll = () => { gutter.scrollTop = textarea.scrollTop; };
        const updateStatus = () => {
            const lines = textarea.value.split('\n').length;
            const chars = textarea.value.length;
            statusEl.textContent = `${lines} lines · ${chars} chars`;
        };
        updateGutter();
        updateStatus();
        textarea.onscroll = syncScroll;
        textarea.oninput = () => { updateGutter(); updateStatus(); };
        textarea.onkeydown = (e) => {
            if (e.key === 'Tab') { e.preventDefault(); insertTab(textarea, e.shiftKey); updateGutter(); }
            if ((e.ctrlKey || e.metaKey) && e.key === 's') { e.preventDefault(); saveBtn.click(); }
        };
        function insertTab(el, shift) {
            const s = el.selectionStart, e2 = el.selectionEnd;
            if (shift) {
                const before = el.value.substring(0, s);
                const lineStart = before.lastIndexOf('\n') + 1;
                if (lineStart < s && el.value.substring(lineStart, lineStart + 1) === '\t') {
                    el.value = el.value.substring(0, lineStart) + el.value.substring(lineStart + 1);
                    el.selectionStart = el.selectionEnd = s - 1;
                }
            } else {
                el.value = el.value.substring(0, s) + '\t' + el.value.substring(e2);
                el.selectionStart = el.selectionEnd = s + 1;
            }
        }
        // Fullscreen toggle
        window._editorToggleFullscreen = () => {
            const content = modal.querySelector('.modal-content');
            if (content.style.maxWidth === '100vw') {
                content.style.maxWidth = '90vw'; content.style.maxHeight = '90vh'; content.style.width = '900px'; content.style.height = '80vh';
            } else {
                content.style.maxWidth = '100vw'; content.style.maxHeight = '100vh'; content.style.width = '100vw'; content.style.height = '100vh';
            }
        };
        // Override save button to write back to VFS
        const saveBtn = modal.querySelector('.modal-footer .btn:last-child');
        const cancelBtn = modal.querySelector('.modal-footer .btn-danger');
        if (saveBtn) {
            saveBtn._origOnclick = saveBtn.onclick;
            saveBtn.onclick = async () => {
                const code = textarea.value;
                const ok = this.terminal.fs.writeFile(this._vfsPath, code);
                if (ok) {
                    this.terminal.print('✅ Saved to ' + this._vfsPath, 'success');
                    // Mirror to _mods/ for test_module compatibility
                    const modMatch = this._vfsPath.match(/(?:^|\/)(\w+)\.js$/);
                    if (modMatch) {
                        const modName = modMatch[1];
                        this.terminal.fs.mkdirRecursive('_mods');
                        this.terminal.fs.writeFile('_mods/' + modName + '.js', code);
                        if (!this.terminal.fs.readFile('_mods/' + modName + '.orig.js')) {
                            this.terminal.fs.writeFile('_mods/' + modName + '.orig.js', 'placeholder');
                        }
                        this.terminal.print('📋 Mirrored to _mods/' + modName + '.js for live testing', 'info');
                    }
                    // Notify tutorial module for quest 4 (edit + save)
                    if (this.terminal.tutorialModule) {
                        this.terminal.tutorialModule.onFileSaved(this._vfsPath);
                    }
                } else {
                    this.terminal.print('❌ Failed to save ' + this._vfsPath, 'error');
                }
                modal.style.display = 'none';
                this._vfsPath = null;
                // Restore original onclick handler
                if (saveBtn._origOnclick) saveBtn.onclick = saveBtn._origOnclick;
                delete saveBtn._origOnclick;
            };
        }
        if (cancelBtn) {
            cancelBtn._origOnclick = cancelBtn.onclick;
            cancelBtn.onclick = () => {
                modal.style.display = 'none';
                this._vfsPath = null;
                if (cancelBtn._origOnclick) cancelBtn.onclick = cancelBtn._origOnclick;
                delete cancelBtn._origOnclick;
            };
        }
    }
}
if (typeof window.webx11 !== 'undefined' && window.webx11) {
    webx11.moduleManager.registerModule(new EditorModule(), 'https://webx11.duckdns.org/spaces/newos4/modules/ext/editor.js');
}