gf-lt/tools_playwright.go

package main

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": "when asked to open a specific URL in a web browser."
},
{
    "name": "pw_click",
    "args": ["selector", "index"],
    "when_to_use": "when asked to click on an element on the current webpage. 'index' is optional (default 0) to handle multiple matches."
},
{
    "name": "pw_fill",
    "args": ["selector", "text", "index"],
    "when_to_use": "when asked to type text into an input field. 'index' is optional."
},
{
    "name": "pw_extract_text",
    "args": ["selector"],
    "when_to_use": "when asked to get 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": "when asked to take a screenshot of the page or a specific element. Returns a file path to the image."
},
{
    "name": "pw_screenshot_and_view",
    "args": ["selector", "full_page"],
    "when_to_use": "when asked to take a screenshot and show it to the model. Returns image for viewing."
},
{
    "name": "pw_wait_for_selector",
    "args": ["selector", "timeout"],
    "when_to_use": "when asked to wait for an element to appear on the page before proceeding."
},
{
    "name": "pw_drag",
    "args": ["x1", "y1", "x2", "y2"],
    "when_to_use": "drag the mouse from point (x1,y1) to (x2,y2)"
}
]
`

var (
	pw               *playwright.Playwright
	browser          playwright.Browser
	browserStarted   bool
	browserStartMu   sync.Mutex
	page             playwright.Page
	browserAvailable bool
)

func checkPlaywright() {
	var err error
	pw, err = playwright.Run()
	if err != nil {
		logger.Warn("playwright not available", "error", err)
		return
	}
	browserAvailable = true
	logger.Info("playwright tools available")
}

func pwStart(args map[string]string) []byte {
	browserStartMu.Lock()
	defer browserStartMu.Unlock()
	if browserStarted {
		return []byte(`{"error": "Browser already started"}`)
	}
	headless := cfg == nil || cfg.PlaywrightHeadless
	var err error
	browser, err = pw.Chromium.Launch(playwright.BrowserTypeLaunchOptions{
		Headless: playwright.Bool(headless),
	})
	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 init() {
	go checkPlaywright()
}