fix: Improve Gemini Web DOM selectors and add debug output

- Make model selector optional (skip if not found, use current model)
- Add multiple fallback selectors for input field and send button
- Add debug logging to trace execution flow
- Improve error messages to suggest running gemini-login

internal/providers/geminiweb/page.go

@@ -46,8 +46,21 @@ func IsLoggedIn(page *rod.Page) bool {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 
-	_, err := page.Context(ctx).Element(`[aria-label*="New chat"], [data-test-id*="new-chat"], button[aria-label*="chat"]`)
+	// 嘗試多種可能的登入狀態指示器
-	return err == nil
+	selectors := []string{
+		`textarea`,
+		`[contenteditable="true"]`,
+		`[aria-label*="chat" i]`,
+		`button[aria-label*="new" i]`,
+	}
+
+	for _, sel := range selectors {
+		_, err := page.Context(ctx).Element(sel)
+		if err == nil {
+			return true
+		}
+	}
+	return false
 }
 
 func SelectModel(page *rod.Page, model string) error {
@@ -56,9 +69,36 @@ func SelectModel(page *rod.Page, model string) error {
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
 
-	modelSwitcher, err := page.Context(ctx).Element(`button[aria-label*="model"], [data-test-id="model-selector"], button[aria-haspopup="listbox"]`)
+	// 嘗試多種可能的模型選擇器選擇器
+	selectors := []string{
+		`button[aria-label*="model" i]`,
+		`button[aria-label*="Model" i]`,
+		`[data-test-id="model-selector"]`,
+		`button[aria-haspopup="listbox"]`,
+		`[class*="model-selector"]`,
+		`[class*="model"] button`,
+	}
+
+	var modelSwitcher *rod.Element
+	var err error
+	for _, sel := range selectors {
+		modelSwitcher, err = page.Context(ctx).Element(sel)
+		if err == nil {
+			break
+		}
+	}
+
 	if err != nil {
-		return fmt.Errorf("model selector not found: %w", err)
+		// 如果找不到模型選擇器，可能是頁面已經在正確的模型上，或是 Gemini 的 UI 不同
+		fmt.Printf("Warning: model selector not found, using current model (requested: %s)\n", displayName)
+		return nil
+	}
+
+	// 獲取目前的模型文字
+	currentText, _ := modelSwitcher.Text()
+	if currentText != "" && strings.Contains(strings.ToLower(currentText), strings.ToLower(displayName)) {
+		// 已經在正確的模型上
+		return nil
 	}
 
 	if err := modelSwitcher.Click(proto.InputMouseButtonLeft, 1); err != nil {
@@ -67,18 +107,52 @@ func SelectModel(page *rod.Page, model string) error {
 
 	time.Sleep(500 * time.Millisecond)
 
-	option, err := page.Context(ctx).Element(fmt.Sprintf(`[aria-label*="%s"], [data-value="%s"]`, displayName, displayName))
+	// 嘗試多種可能的選項選擇器
+	optionSelectors := []string{
+		fmt.Sprintf(`[aria-label*="%s" i]`, displayName),
+		fmt.Sprintf(`[data-value*="%s" i]`, displayName),
+		fmt.Sprintf(`text=%s`, displayName),
+		`[role="option"]`,
+	}
+
+	var option *rod.Element
+	for _, sel := range optionSelectors {
+		option, err = page.Context(ctx).Element(sel)
+		if err == nil {
+			break
+		}
+	}
+
 	if err != nil {
-		return fmt.Errorf("model option %s not found: %w", displayName, err)
+		fmt.Printf("Warning: model option %s not found, using current model\n", displayName)
+		return nil
 	}
 
 	return option.Click(proto.InputMouseButtonLeft, 1)
 }
 
 func SendPrompt(page *rod.Page, prompt string) error {
-	textarea, err := page.Element(`textarea[aria-label*="message"], textarea[placeholder*="message"], rich-textarea, .ql-editor, div[contenteditable="true"]`)
+	// 嘗試多種可能的輸入框選擇器
+	selectors := []string{
+		`textarea[aria-label*="message" i]`,
+		`textarea[placeholder*="message" i]`,
+		`textarea`,
+		`[contenteditable="true"]`,
+		`[role="textbox"]`,
+		`rich-textarea`,
+	}
+
+	var textarea *rod.Element
+	var err error
+	for _, sel := range selectors {
+		textarea, err = page.Element(sel)
+		if err == nil {
+			break
+		}
+	}
+
 	if err != nil {
-		return fmt.Errorf("input field not found: %w", err)
+		return fmt.Errorf("input field not found after trying selectors %v: %w", selectors, err)
 	}
 
 	if err := textarea.Input(prompt); err != nil {
@@ -87,7 +161,22 @@ func SendPrompt(page *rod.Page, prompt string) error {
 
 	time.Sleep(300 * time.Millisecond)
 
-	sendBtn, err := page.Element(`button[aria-label*="Send"], button[aria-label*="submit"], button[type="submit"]`)
+	// 嘗試多種可能的發送按鈕選擇器
+	btnSelectors := []string{
+		`button[aria-label*="Send" i]`,
+		`button[aria-label*="submit" i]`,
+		`button[type="submit"]`,
+		`button svg`,
+	}
+
+	var sendBtn *rod.Element
+	for _, sel := range btnSelectors {
+		sendBtn, err = page.Element(sel)
+		if err == nil {
+			break
+		}
+	}
+
 	if err != nil {
 		return fmt.Errorf("send button not found: %w", err)
 	}

internal/providers/geminiweb/provider.go

@@ -43,15 +43,19 @@ func (p *Provider) initPool() error {
 }
 
 func (p *Provider) Generate(ctx context.Context, model string, messages []apitypes.Message, tools []apitypes.Tool, cb func(apitypes.StreamChunk)) error {
+	fmt.Printf("[GeminiWeb] Starting generation with model: %s\n", model)
+
 	if err := p.initPool(); err != nil {
 		return err
 	}
 
 	session := p.pool.GetAvailable()
 	if session == nil {
-		return fmt.Errorf("no available sessions")
+		return fmt.Errorf("no available sessions - please run 'gemini-login <session-name>' first")
 	}
 
+	fmt.Printf("[GeminiWeb] Using session: %s\n", session.Name)
+
 	p.pool.StartSession(session)
 	defer p.pool.EndSession(session)
 
@@ -67,34 +71,45 @@ func (p *Provider) Generate(ctx context.Context, model string, messages []apityp
 	}
 
 	if session.CookieFile != "" {
+		fmt.Printf("[GeminiWeb] Loading cookies from: %s\n", session.CookieFile)
 		cookies, err := LoadCookiesFromFile(session.CookieFile)
 		if err == nil {
 			if err := SetCookiesOnPage(page, cookies); err != nil {
 				return fmt.Errorf("failed to set cookies: %w", err)
 			}
+			fmt.Printf("[GeminiWeb] Loaded %d cookies\n", len(cookies))
+		} else {
+			fmt.Printf("[GeminiWeb] Warning: could not load cookies: %v\n", err)
 		}
 	}
 
+	fmt.Printf("[GeminiWeb] Navigating to Gemini...\n")
 	if err := NavigateToGemini(page); err != nil {
 		return fmt.Errorf("failed to navigate: %w", err)
 	}
 
 	time.Sleep(2 * time.Second)
 
+	fmt.Printf("[GeminiWeb] Checking login status...\n")
 	if !IsLoggedIn(page) {
-		return fmt.Errorf("session not logged in, please run gemini-login first")
+		return fmt.Errorf("session not logged in - please run 'gemini-login %s' first", session.Name)
 	}
+	fmt.Printf("[GeminiWeb] Logged in successfully\n")
 
+	fmt.Printf("[GeminiWeb] Selecting model: %s\n", model)
 	if err := SelectModel(page, model); err != nil {
 		return fmt.Errorf("failed to select model: %w", err)
 	}
+	fmt.Printf("[GeminiWeb] Model selected\n")
 
 	time.Sleep(500 * time.Millisecond)
 
 	prompt := buildPromptFromMessages(messages)
+	fmt.Printf("[GeminiWeb] Sending prompt (length: %d chars)\n", len(prompt))
 	if err := SendPrompt(page, prompt); err != nil {
 		return fmt.Errorf("failed to send prompt: %w", err)
 	}
+	fmt.Printf("[GeminiWeb] Prompt sent, waiting for response...\n")
 
 	return WaitForResponse(page,
 		func(text string) {

scripts/detect-gemini-dom.go

@@ -0,0 +1,159 @@
+package main
+
+import (
+	"cursor-api-proxy/internal/providers/geminiweb"
+	"fmt"
+	"os"
+
+	"github.com/go-rod/rod"
+	"github.com/go-rod/rod/lib/launcher"
+	"github.com/go-rod/rod/lib/proto"
+)
+
+func main() {
+	fmt.Println("Starting Gemini DOM detection...")
+	fmt.Println("This will open a browser and analyze the Gemini web interface.")
+	fmt.Println()
+
+	// 啟動可見瀏覽器
+	l := launcher.New().Headless(false)
+	url, err := l.Launch()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to launch browser: %v\n", err)
+		os.Exit(1)
+	}
+
+	browser := rod.New().ControlURL(url)
+	if err := browser.Connect(); err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to connect browser: %v\n", err)
+		os.Exit(1)
+	}
+	defer browser.Close()
+
+	page, err := browser.Page(proto.TargetCreateTarget{URL: "about:blank"})
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to create page: %v\n", err)
+		os.Exit(1)
+	}
+
+	// 載入 cookies（如果有）
+	home, _ := os.UserHomeDir()
+	cookieFile := home + "/.cursor-api-proxy/gemini-accounts/session-1/cookies.json"
+	if _, err := os.Stat(cookieFile); err == nil {
+		cookies, err := geminiweb.LoadCookiesFromFile(cookieFile)
+		if err == nil {
+			geminiweb.SetCookiesOnPage(page, cookies)
+			fmt.Println("Loaded existing cookies")
+		}
+	}
+
+	// 導航到 Gemini
+	fmt.Println("Navigating to gemini.google.com...")
+	if err := geminiweb.NavigateToGemini(page); err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to navigate: %v\n", err)
+	}
+
+	fmt.Println()
+	fmt.Println("Browser is now open. Please:")
+	fmt.Println("1. Log in if needed")
+	fmt.Println("2. Wait for the chat interface to fully load")
+	fmt.Println("3. Look for the model selector dropdown")
+	fmt.Println()
+	fmt.Println("Press Enter to analyze the DOM...")
+	fmt.Scanln()
+
+	// 分析 DOM
+	analyzeDOM(page)
+
+	fmt.Println()
+	fmt.Println("Press Enter to close...")
+	fmt.Scanln()
+}
+
+func analyzeDOM(page *rod.Page) {
+	fmt.Println("=== DOM Analysis ===")
+	fmt.Println()
+
+	// 尋找可能的輸入框
+	fmt.Println("Looking for input fields...")
+	selectors := []string{
+		`textarea`,
+		`[contenteditable="true"]`,
+		`[role="textbox"]`,
+		`input[type="text"]`,
+	}
+	for _, sel := range selectors {
+		elements, err := page.Elements(sel)
+		if err == nil && len(elements) > 0 {
+			fmt.Printf("  Found %d elements with: %s\n", len(elements), sel)
+			for i, el := range elements {
+				tag, _ := el.Property("tagName")
+				class, _ := el.Attribute("class")
+				ariaLabel, _ := el.Attribute("aria-label")
+				placeholder, _ := el.Attribute("placeholder")
+				fmt.Printf("    [%d] tag=%s class=%s aria-label=%s placeholder=%s\n",
+					i, tag, class, ariaLabel, placeholder)
+			}
+		}
+	}
+
+	// 尋找可能的發送按鈕
+	fmt.Println()
+	fmt.Println("Looking for send buttons...")
+	buttonSelectors := []string{
+		`button`,
+		`[role="button"]`,
+		`[type="submit"]`,
+	}
+	for _, sel := range buttonSelectors {
+		elements, err := page.Elements(sel)
+		if err == nil && len(elements) > 0 {
+			fmt.Printf("  Found %d elements with: %s\n", len(elements), sel)
+			for i, el := range elements {
+				if i >= 5 {
+					fmt.Printf("    ... and %d more\n", len(elements)-5)
+					break
+				}
+				tag, _ := el.Property("tagName")
+				class, _ := el.Attribute("class")
+				ariaLabel, _ := el.Attribute("aria-label")
+				text, _ := el.Text()
+				text = truncate(text, 30)
+				fmt.Printf("    [%d] tag=%s class=%s aria-label=%s text=%s\n",
+					i, tag, class, ariaLabel, text)
+			}
+		}
+	}
+
+	// 尋找模型選擇器
+	fmt.Println()
+	fmt.Println("Looking for model selector...")
+	modelSelectors := []string{
+		`[aria-label*="model"]`,
+		`[aria-label*="Model"]`,
+		`button[aria-haspopup]`,
+		`[data-test-id*="model"]`,
+		`[class*="model"]`,
+	}
+	for _, sel := range modelSelectors {
+		elements, err := page.Elements(sel)
+		if err == nil && len(elements) > 0 {
+			fmt.Printf("  Found with: %s\n", sel)
+			for i, el := range elements {
+				tag, _ := el.Property("tagName")
+				class, _ := el.Attribute("class")
+				ariaLabel, _ := el.Attribute("aria-label")
+				text, _ := el.Text()
+				fmt.Printf("    [%d] tag=%s class=%s aria-label=%s text=%s\n",
+					i, tag, class, ariaLabel, truncate(text, 30))
+			}
+		}
+	}
+}
+
+func truncate(s string, max int) string {
+	if len(s) <= max {
+		return s
+	}
+	return s[:max] + "..."
+}