Refactor: moving tool related code into tools package

tools/pw.go

@@ -0,0 +1,730 @@
+package tools
+
+import (
+	"encoding/json"
+	"fmt"
+	"gf-lt/models"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+
+	"github.com/playwright-community/playwright-go"
+)
+
+var browserToolSysMsg = `
+Additional browser automation tools (Playwright):
+[
+{
+    "name": "pw_start",
+    "args": [],
+    "when_to_use": "start a browser instance before doing any browser automation. Must be called first."
+},
+{
+    "name": "pw_stop",
+    "args": [],
+    "when_to_use": "stop the browser instance when done with automation."
+},
+{
+    "name": "pw_is_running",
+    "args": [],
+    "when_to_use": "check if browser is currently running."
+},
+{
+    "name": "pw_navigate",
+    "args": ["url"],
+    "when_to_use": "open a specific URL in the web browser."
+},
+{
+    "name": "pw_click",
+    "args": ["selector", "index"],
+    "when_to_use": "click on an element on the current webpage. Use 'index' for multiple matches (default 0)."
+},
+{
+    "name": "pw_fill",
+    "args": ["selector", "text", "index"],
+    "when_to_use": "type text into an input field. Use 'index' for multiple matches (default 0)."
+},
+{
+    "name": "pw_extract_text",
+    "args": ["selector"],
+    "when_to_use": "extract text content from the page or specific elements. Use selector 'body' for all page text."
+},
+{
+    "name": "pw_screenshot",
+    "args": ["selector", "full_page"],
+    "when_to_use": "take a screenshot of the page or a specific element. Returns a file path to the image. Use to verify actions or inspect visual state."
+},
+{
+    "name": "pw_screenshot_and_view",
+    "args": ["selector", "full_page"],
+    "when_to_use": "take a screenshot and return the image for viewing. Use to visually verify page state."
+},
+{
+    "name": "pw_wait_for_selector",
+    "args": ["selector", "timeout"],
+    "when_to_use": "wait for an element to appear on the page before proceeding with further actions."
+},
+{
+    "name": "pw_drag",
+    "args": ["x1", "y1", "x2", "y2"],
+    "when_to_use": "drag the mouse from point (x1,y1) to (x2,y2)."
+},
+{
+    "name": "pw_click_at",
+    "args": ["x", "y"],
+    "when_to_use": "click at specific X,Y coordinates on the page. Use when you know the exact position."
+},
+{
+    "name": "pw_get_html",
+    "args": ["selector"],
+    "when_to_use": "get the HTML content of the page or a specific element. Use to understand page structure or extract raw HTML."
+},
+{
+    "name": "pw_get_dom",
+    "args": ["selector"],
+    "when_to_use": "get a structured DOM representation with tag, attributes, text, and children. Use to inspect element hierarchy and properties."
+},
+{
+    "name": "pw_search_elements",
+    "args": ["text", "selector"],
+    "when_to_use": "search for elements by text content or CSS selector. Returns matching elements with their tags, text, and HTML."
+}
+]
+`
+
+var (
+	pw             *playwright.Playwright
+	browser        playwright.Browser
+	browserStarted bool
+	browserStartMu sync.Mutex
+	page           playwright.Page
+)
+
+func PwShutDown() error {
+	if pw == nil {
+		return nil
+	}
+	pwStop(nil)
+	return pw.Stop()
+}
+
+func InstallPW() error {
+	err := playwright.Install(&playwright.RunOptions{Verbose: false})
+	if err != nil {
+		logger.Warn("playwright not available", "error", err)
+		return err
+	}
+	return nil
+}
+
+func CheckPlaywright() error {
+	var err error
+	pw, err = playwright.Run()
+	if err != nil {
+		logger.Warn("playwright not available", "error", err)
+		return err
+	}
+	return nil
+}
+
+func pwStart(args map[string]string) []byte {
+	browserStartMu.Lock()
+	defer browserStartMu.Unlock()
+	if browserStarted {
+		return []byte(`{"error": "Browser already started"}`)
+	}
+	var err error
+	browser, err = pw.Chromium.Launch(playwright.BrowserTypeLaunchOptions{
+		Headless: playwright.Bool(!cfg.PlaywrightDebug),
+	})
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to launch browser: %s"}`, err.Error()))
+	}
+	page, err = browser.NewPage()
+	if err != nil {
+		browser.Close()
+		return []byte(fmt.Sprintf(`{"error": "failed to create page: %s"}`, err.Error()))
+	}
+	browserStarted = true
+	return []byte(`{"success": true, "message": "Browser started"}`)
+}
+
+func pwStop(args map[string]string) []byte {
+	browserStartMu.Lock()
+	defer browserStartMu.Unlock()
+	if !browserStarted {
+		return []byte(`{"success": true, "message": "Browser was not running"}`)
+	}
+	if page != nil {
+		page.Close()
+		page = nil
+	}
+	if browser != nil {
+		browser.Close()
+		browser = nil
+	}
+	browserStarted = false
+	return []byte(`{"success": true, "message": "Browser stopped"}`)
+}
+
+func pwIsRunning(args map[string]string) []byte {
+	if browserStarted {
+		return []byte(`{"running": true, "message": "Browser is running"}`)
+	}
+	return []byte(`{"running": false, "message": "Browser is not running"}`)
+}
+
+func pwNavigate(args map[string]string) []byte {
+	url, ok := args["url"]
+	if !ok || url == "" {
+		return []byte(`{"error": "url not provided"}`)
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	_, err := page.Goto(url)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to navigate: %s"}`, err.Error()))
+	}
+	title, _ := page.Title()
+	pageURL := page.URL()
+	return []byte(fmt.Sprintf(`{"success": true, "title": "%s", "url": "%s"}`, title, pageURL))
+}
+
+func pwClick(args map[string]string) []byte {
+	selector, ok := args["selector"]
+	if !ok || selector == "" {
+		return []byte(`{"error": "selector not provided"}`)
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	index := 0
+	if args["index"] != "" {
+		if i, err := strconv.Atoi(args["index"]); err != nil {
+			logger.Warn("failed to parse index", "value", args["index"], "error", err)
+		} else {
+			index = i
+		}
+	}
+	locator := page.Locator(selector)
+	count, err := locator.Count()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to find elements: %s"}`, err.Error()))
+	}
+	if index >= count {
+		return []byte(fmt.Sprintf(`{"error": "Element not found at index %d (found %d elements)"}`, index, count))
+	}
+	err = locator.Nth(index).Click()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to click: %s"}`, err.Error()))
+	}
+	return []byte(`{"success": true, "message": "Clicked element"}`)
+}
+
+func pwFill(args map[string]string) []byte {
+	selector, ok := args["selector"]
+	if !ok || selector == "" {
+		return []byte(`{"error": "selector not provided"}`)
+	}
+	text := args["text"]
+	if text == "" {
+		text = ""
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	index := 0
+	if args["index"] != "" {
+		if i, err := strconv.Atoi(args["index"]); err != nil {
+			logger.Warn("failed to parse index", "value", args["index"], "error", err)
+		} else {
+			index = i
+		}
+	}
+	locator := page.Locator(selector)
+	count, err := locator.Count()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to find elements: %s"}`, err.Error()))
+	}
+	if index >= count {
+		return []byte(fmt.Sprintf(`{"error": "Element not found at index %d"}`, index))
+	}
+	err = locator.Nth(index).Fill(text)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to fill: %s"}`, err.Error()))
+	}
+	return []byte(`{"success": true, "message": "Filled input"}`)
+}
+
+func pwExtractText(args map[string]string) []byte {
+	selector := args["selector"]
+	if selector == "" {
+		selector = "body"
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	locator := page.Locator(selector)
+	count, err := locator.Count()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to find elements: %s"}`, err.Error()))
+	}
+	if count == 0 {
+		return []byte(`{"error": "No elements found"}`)
+	}
+	if selector == "body" {
+		text, err := page.Locator("body").TextContent()
+		if err != nil {
+			return []byte(fmt.Sprintf(`{"error": "failed to get text: %s"}`, err.Error()))
+		}
+		return []byte(fmt.Sprintf(`{"text": "%s"}`, text))
+	}
+	var texts []string
+	for i := 0; i < count; i++ {
+		text, err := locator.Nth(i).TextContent()
+		if err != nil {
+			continue
+		}
+		texts = append(texts, text)
+	}
+	return []byte(fmt.Sprintf(`{"text": "%s"}`, joinLines(texts)))
+}
+
+func joinLines(lines []string) string {
+	var sb strings.Builder
+	for i, line := range lines {
+		if i > 0 {
+			sb.WriteString("\n")
+		}
+		sb.WriteString(line)
+	}
+	return sb.String()
+}
+
+func pwScreenshot(args map[string]string) []byte {
+	selector := args["selector"]
+	fullPage := args["full_page"] == "true"
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	path := fmt.Sprintf("/tmp/pw_screenshot_%d.png", os.Getpid())
+	var err error
+	if selector != "" && selector != "body" {
+		locator := page.Locator(selector)
+		_, err = locator.Screenshot(playwright.LocatorScreenshotOptions{
+			Path: playwright.String(path),
+		})
+	} else {
+		_, err = page.Screenshot(playwright.PageScreenshotOptions{
+			Path:     playwright.String(path),
+			FullPage: playwright.Bool(fullPage),
+		})
+	}
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to take screenshot: %s"}`, err.Error()))
+	}
+	return []byte(fmt.Sprintf(`{"path": "%s"}`, path))
+}
+
+func pwScreenshotAndView(args map[string]string) []byte {
+	selector := args["selector"]
+	fullPage := args["full_page"] == "true"
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	path := fmt.Sprintf("/tmp/pw_screenshot_%d.png", os.Getpid())
+	var err error
+	if selector != "" && selector != "body" {
+		locator := page.Locator(selector)
+		_, err = locator.Screenshot(playwright.LocatorScreenshotOptions{
+			Path: playwright.String(path),
+		})
+	} else {
+		_, err = page.Screenshot(playwright.PageScreenshotOptions{
+			Path:     playwright.String(path),
+			FullPage: playwright.Bool(fullPage),
+		})
+	}
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to take screenshot: %s"}`, err.Error()))
+	}
+	dataURL, err := models.CreateImageURLFromPath(path)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to create image URL: %s"}`, err.Error()))
+	}
+	resp := models.MultimodalToolResp{
+		Type: "multimodal_content",
+		Parts: []map[string]string{
+			{"type": "text", "text": "Screenshot saved: " + path},
+			{"type": "image_url", "url": dataURL},
+		},
+	}
+	jsonResult, err := json.Marshal(resp)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to marshal result: %s"}`, err.Error()))
+	}
+	return jsonResult
+}
+
+func pwWaitForSelector(args map[string]string) []byte {
+	selector, ok := args["selector"]
+	if !ok || selector == "" {
+		return []byte(`{"error": "selector not provided"}`)
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	timeout := 30000
+	if args["timeout"] != "" {
+		if t, err := strconv.Atoi(args["timeout"]); err != nil {
+			logger.Warn("failed to parse timeout", "value", args["timeout"], "error", err)
+		} else {
+			timeout = t
+		}
+	}
+	locator := page.Locator(selector)
+	err := locator.WaitFor(playwright.LocatorWaitForOptions{
+		Timeout: playwright.Float(float64(timeout)),
+	})
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "element not found: %s"}`, err.Error()))
+	}
+	return []byte(`{"success": true, "message": "Element found"}`)
+}
+
+func pwDrag(args map[string]string) []byte {
+	x1, ok := args["x1"]
+	if !ok {
+		return []byte(`{"error": "x1 not provided"}`)
+	}
+	y1, ok := args["y1"]
+	if !ok {
+		return []byte(`{"error": "y1 not provided"}`)
+	}
+	x2, ok := args["x2"]
+	if !ok {
+		return []byte(`{"error": "x2 not provided"}`)
+	}
+	y2, ok := args["y2"]
+	if !ok {
+		return []byte(`{"error": "y2 not provided"}`)
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	var fx1, fy1, fx2, fy2 float64
+	if parsedX1, err := strconv.ParseFloat(x1, 64); err != nil {
+		logger.Warn("failed to parse x1", "value", x1, "error", err)
+	} else {
+		fx1 = parsedX1
+	}
+	if parsedY1, err := strconv.ParseFloat(y1, 64); err != nil {
+		logger.Warn("failed to parse y1", "value", y1, "error", err)
+	} else {
+		fy1 = parsedY1
+	}
+	if parsedX2, err := strconv.ParseFloat(x2, 64); err != nil {
+		logger.Warn("failed to parse x2", "value", x2, "error", err)
+	} else {
+		fx2 = parsedX2
+	}
+	if parsedY2, err := strconv.ParseFloat(y2, 64); err != nil {
+		logger.Warn("failed to parse y2", "value", y2, "error", err)
+	} else {
+		fy2 = parsedY2
+	}
+	mouse := page.Mouse()
+	err := mouse.Move(fx1, fy1)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to move mouse: %s"}`, err.Error()))
+	}
+	err = mouse.Down()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to mouse down: %s"}`, err.Error()))
+	}
+	err = mouse.Move(fx2, fy2)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to move mouse: %s"}`, err.Error()))
+	}
+	err = mouse.Up()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to mouse up: %s"}`, err.Error()))
+	}
+	return []byte(fmt.Sprintf(`{"success": true, "message": "Dragged from (%s,%s) to (%s,%s)"}`, x1, y1, x2, y2))
+}
+
+func pwDragBySelector(args map[string]string) []byte {
+	fromSelector, ok := args["fromSelector"]
+	if !ok || fromSelector == "" {
+		return []byte(`{"error": "fromSelector not provided"}`)
+	}
+	toSelector, ok := args["toSelector"]
+	if !ok || toSelector == "" {
+		return []byte(`{"error": "toSelector not provided"}`)
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+
+	// Get center coordinates of both elements using JavaScript
+	fromJS := fmt.Sprintf(`
+		function getCenter(selector) {
+			const el = document.querySelector(selector);
+			if (!el) return null;
+			const rect = el.getBoundingClientRect();
+			return { x: rect.left + rect.width / 2, y: rect.top + rect.height / 2 };
+		}
+		getCenter(%q)
+	`, fromSelector)
+	toJS := fmt.Sprintf(`
+		function getCenter(selector) {
+			const el = document.querySelector(selector);
+			if (!el) return null;
+			const rect = el.getBoundingClientRect();
+			return { x: rect.left + rect.width / 2, y: rect.top + rect.height / 2 };
+		}
+		getCenter(%q)
+	`, toSelector)
+
+	fromResult, err := page.Evaluate(fromJS)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to get from element: %s"}`, err.Error()))
+	}
+	fromMap, ok := fromResult.(map[string]interface{})
+	if !ok || fromMap == nil {
+		return []byte(fmt.Sprintf(`{"error": "from selector '%s' not found"}`, fromSelector))
+	}
+	fromX := fromMap["x"].(float64)
+	fromY := fromMap["y"].(float64)
+
+	toResult, err := page.Evaluate(toJS)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to get to element: %s"}`, err.Error()))
+	}
+	toMap, ok := toResult.(map[string]interface{})
+	if !ok || toMap == nil {
+		return []byte(fmt.Sprintf(`{"error": "to selector '%s' not found"}`, toSelector))
+	}
+	toX := toMap["x"].(float64)
+	toY := toMap["y"].(float64)
+
+	// Perform the drag using coordinates
+	mouse := page.Mouse()
+	err = mouse.Move(fromX, fromY)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to move mouse: %s"}`, err.Error()))
+	}
+	err = mouse.Down()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to mouse down: %s"}`, err.Error()))
+	}
+	err = mouse.Move(toX, toY)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to move mouse: %s"}`, err.Error()))
+	}
+	err = mouse.Up()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to mouse up: %s"}`, err.Error()))
+	}
+	msg := fmt.Sprintf("Dragged from %s (%.0f,%.0f) to %s (%.0f,%.0f)", fromSelector, fromX, fromY, toSelector, toX, toY)
+	return []byte(fmt.Sprintf(`{"success": true, "message": "%s"}`, msg))
+}
+
+func pwClickAt(args map[string]string) []byte {
+	x, ok := args["x"]
+	if !ok {
+		return []byte(`{"error": "x not provided"}`)
+	}
+	y, ok := args["y"]
+	if !ok {
+		return []byte(`{"error": "y not provided"}`)
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	fx, err := strconv.ParseFloat(x, 64)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to parse x: %s"}`, err.Error()))
+	}
+	fy, err := strconv.ParseFloat(y, 64)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to parse y: %s"}`, err.Error()))
+	}
+	mouse := page.Mouse()
+	err = mouse.Click(fx, fy)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to click: %s"}`, err.Error()))
+	}
+	return []byte(fmt.Sprintf(`{"success": true, "message": "Clicked at (%s,%s)"}`, x, y))
+}
+
+func pwGetHTML(args map[string]string) []byte {
+	selector := args["selector"]
+	if selector == "" {
+		selector = "body"
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	locator := page.Locator(selector)
+	count, err := locator.Count()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to find elements: %s"}`, err.Error()))
+	}
+	if count == 0 {
+		return []byte(`{"error": "No elements found"}`)
+	}
+	html, err := locator.First().InnerHTML()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to get HTML: %s"}`, err.Error()))
+	}
+	return []byte(fmt.Sprintf(`{"html": %s}`, jsonString(html)))
+}
+
+type DOMElement struct {
+	Tag        string            `json:"tag,omitempty"`
+	Attributes map[string]string `json:"attributes,omitempty"`
+	Text       string            `json:"text,omitempty"`
+	Children   []DOMElement      `json:"children,omitempty"`
+	Selector   string            `json:"selector,omitempty"`
+	InnerHTML  string            `json:"innerHTML,omitempty"`
+}
+
+func buildDOMTree(locator playwright.Locator) ([]DOMElement, error) {
+	var results []DOMElement
+	count, err := locator.Count()
+	if err != nil {
+		return nil, err
+	}
+	for i := 0; i < count; i++ {
+		el := locator.Nth(i)
+		dom, err := elementToDOM(el)
+		if err != nil {
+			continue
+		}
+		results = append(results, dom)
+	}
+	return results, nil
+}
+
+func elementToDOM(el playwright.Locator) (DOMElement, error) {
+	dom := DOMElement{}
+	tag, err := el.Evaluate(`el => el.nodeName`, nil)
+	if err == nil {
+		dom.Tag = strings.ToLower(fmt.Sprintf("%v", tag))
+	}
+	attributes := make(map[string]string)
+	attrs, err := el.Evaluate(`el => {
+		let attrs = {};
+		for (let i = 0; i < el.attributes.length; i++) {
+			let attr = el.attributes[i];
+			attrs[attr.name] = attr.value;
+		}
+		return attrs;
+	}`, nil)
+	if err == nil {
+		if amap, ok := attrs.(map[string]any); ok {
+			for k, v := range amap {
+				if vs, ok := v.(string); ok {
+					attributes[k] = vs
+				}
+			}
+		}
+	}
+	if len(attributes) > 0 {
+		dom.Attributes = attributes
+	}
+	text, err := el.TextContent()
+	if err == nil && text != "" {
+		dom.Text = text
+	}
+	innerHTML, err := el.InnerHTML()
+	if err == nil && innerHTML != "" {
+		dom.InnerHTML = innerHTML
+	}
+	childCount, _ := el.Count()
+	if childCount > 0 {
+		childrenLocator := el.Locator("*")
+		children, err := buildDOMTree(childrenLocator)
+		if err == nil && len(children) > 0 {
+			dom.Children = children
+		}
+	}
+	return dom, nil
+}
+
+func pwGetDOM(args map[string]string) []byte {
+	selector := args["selector"]
+	if selector == "" {
+		selector = "body"
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	locator := page.Locator(selector)
+	count, err := locator.Count()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to find elements: %s"}`, err.Error()))
+	}
+	if count == 0 {
+		return []byte(`{"error": "No elements found"}`)
+	}
+	dom, err := elementToDOM(locator.First())
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to get DOM: %s"}`, err.Error()))
+	}
+	data, err := json.Marshal(dom)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to marshal DOM: %s"}`, err.Error()))
+	}
+	return []byte(fmt.Sprintf(`{"dom": %s}`, string(data)))
+}
+
+func pwSearchElements(args map[string]string) []byte {
+	text := args["text"]
+	selector := args["selector"]
+	if text == "" && selector == "" {
+		return []byte(`{"error": "text or selector not provided"}`)
+	}
+	if !browserStarted || page == nil {
+		return []byte(`{"error": "Browser not started. Call pw_start first."}`)
+	}
+	var locator playwright.Locator
+	if text != "" {
+		locator = page.GetByText(text)
+	} else {
+		locator = page.Locator(selector)
+	}
+	count, err := locator.Count()
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to search elements: %s"}`, err.Error()))
+	}
+	if count == 0 {
+		return []byte(`{"elements": []}`)
+	}
+	var results []map[string]string
+	for i := 0; i < count; i++ {
+		el := locator.Nth(i)
+		tag, _ := el.Evaluate(`el => el.nodeName`, nil)
+		text, _ := el.TextContent()
+		html, _ := el.InnerHTML()
+		results = append(results, map[string]string{
+			"index": strconv.Itoa(i),
+			"tag":   strings.ToLower(fmt.Sprintf("%v", tag)),
+			"text":  text,
+			"html":  html,
+		})
+	}
+	data, err := json.Marshal(results)
+	if err != nil {
+		return []byte(fmt.Sprintf(`{"error": "failed to marshal results: %s"}`, err.Error()))
+	}
+	return []byte(fmt.Sprintf(`{"elements": %s}`, string(data)))
+}
+
+func jsonString(s string) string {
+	b, _ := json.Marshal(s)
+	return string(b)
+}