Gemini cleanup, tool calling working

pkg/lmcli/provider/google/google.go

@@ -41,9 +41,18 @@ type Content struct {
 	Parts []ContentPart `json:"parts"`
 }
 
+type GenerationConfig struct {
+	MaxOutputTokens *int     `json:"maxOutputTokens,omitempty"`
+	Temperature     *float32 `json:"temperature,omitempty"`
+	TopP            *float32 `json:"topP,omitempty"`
+	TopK            *int     `json:"topK,omitempty"`
+}
+
 type GenerateContentRequest struct {
 	Contents           []Content         `json:"contents"`
 	Tools              []Tool            `json:"tools,omitempty"`
+	SystemInstructions string            `json:"systemInstructions,omitempty"`
+	GenerationConfig   *GenerationConfig `json:"generationConfig,omitempty"`
 }
 
 type Candidate struct {
@@ -52,8 +61,15 @@ type Candidate struct {
 	Index        int     `json:"index"`
 }
 
+type UsageMetadata struct {
+	PromptTokenCount     int `json:"promptTokenCount"`
+	CandidatesTokenCount int `json:"candidatesTokenCount"`
+	TotalTokenCount      int `json:"totalTokenCount"`
+}
+
 type GenerateContentResponse struct {
 	Candidates    []Candidate   `json:"candidates"`
+	UsageMetadata UsageMetadata `json:"usageMetadata"`
 }
 
 type Tool struct {
@@ -75,7 +91,7 @@ type ToolParameters struct {
 type ToolParameter struct {
 	Type        string   `json:"type"`
 	Description string   `json:"description"`
-	Enum        []string `json:"enum,omitempty"`
+	Values      []string `json:"values,omitempty"`
 }
 
 func convertTools(tools []model.Tool) []Tool {
@@ -85,10 +101,11 @@ func convertTools(tools []model.Tool) []Tool {
 		var required []string
 
 		for _, param := range tool.Parameters {
+			// TODO: proper enum handing
 			params[param.Name] = ToolParameter{
 				Type:        param.Type,
 				Description: param.Description,
-				Enum:        param.Enum,
+				Values:      param.Enum,
 			}
 			if param.Required {
 				required = append(required, param.Name)
@@ -142,13 +159,36 @@ func convertToolCallToAPI(parts []ContentPart) []model.ToolCall {
 	return converted
 }
 
+func convertToolResultsToGemini(toolResults []model.ToolResult) ([]FunctionResponse, error) {
+	results := make([]FunctionResponse, len(toolResults))
+	for i, result := range toolResults {
+		var obj interface{}
+		err := json.Unmarshal([]byte(result.Result), &obj)
+		if err != nil {
+			return nil, fmt.Errorf("Could not unmarshal %s: %v", result.Result, err)
+		}
+		results[i] = FunctionResponse{
+			Name:     result.ToolName,
+			Response: obj,
+		}
+	}
+	return results, nil
+}
+
 func createGenerateContentRequest(
 	params model.RequestParameters,
 	messages []model.Message,
-) GenerateContentRequest {
+) (*GenerateContentRequest, error) {
 	requestContents := make([]Content, 0, len(messages))
 
-	for _, m := range messages {
+	startIdx := 0
+	var system string
+	if len(messages) > 0 && messages[0].Role == model.MessageRoleSystem {
+		system = messages[0].Content
+		startIdx = 1
+	}
+
+	for _, m := range messages[startIdx:] {
 		switch m.Role {
 		case "tool_call":
 			content := Content{
@@ -157,16 +197,17 @@ func createGenerateContentRequest(
 			}
 			requestContents = append(requestContents, content)
 		case "tool_result":
+			results, err := convertToolResultsToGemini(m.ToolResults)
+			if err != nil {
+				return nil, err
+			}
 			// expand tool_result messages' results into multiple gemini messages
-			for _, result := range m.ToolResults {
+			for _, result := range results {
 				content := Content{
 					Role: "function",
 					Parts: []ContentPart{
 						{
-							FunctionResp: &FunctionResponse{
+							FunctionResp: &result,
-								Name:     result.ToolCallID,
-								Response: result.Result,
-							},
 						},
 					},
 				}
@@ -197,15 +238,21 @@ func createGenerateContentRequest(
 		}
 	}
 
-	request := GenerateContentRequest{
+	request := &GenerateContentRequest{
 		Contents: requestContents,
+		SystemInstructions: system,
+		GenerationConfig: &GenerationConfig{
+			MaxOutputTokens: &params.MaxTokens,
+			Temperature:     &params.Temperature,
+			TopP:            &params.TopP,
+		},
 	}
 
 	if len(params.ToolBag) > 0 {
 		request.Tools = convertTools(params.ToolBag)
 	}
 
-	return request
+	return request, nil
 }
 
 func handleToolCalls(
@@ -276,7 +323,10 @@ func (c *Client) CreateChatCompletion(
 		return "", fmt.Errorf("Can't create completion from no messages")
 	}
 
-	req := createGenerateContentRequest(params, messages)
+	req, err := createGenerateContentRequest(params, messages)
+	if err != nil {
+		return "", err
+	}
 	jsonData, err := json.Marshal(req)
 	if err != nil {
 		return "", err
@@ -349,7 +399,10 @@ func (c *Client) CreateChatCompletionStream(
 		return "", fmt.Errorf("Can't create completion from no messages")
 	}
 
-	req := createGenerateContentRequest(params, messages)
+	req, err := createGenerateContentRequest(params, messages)
+	if err != nil {
+		return "", err
+	}
 	jsonData, err := json.Marshal(req)
 	if err != nil {
 		return "", err
@@ -377,6 +430,8 @@ func (c *Client) CreateChatCompletionStream(
 		content.WriteString(lastMessage.Content)
 	}
 
+	var toolCalls []model.ToolCall
+
 	reader := bufio.NewReader(resp.Body)
 	for {
 		line, err := reader.ReadBytes('\n')
@@ -401,8 +456,6 @@ func (c *Client) CreateChatCompletionStream(
 		}
 
 		for _, candidate := range streamResp.Candidates {
-			var toolCalls []model.ToolCall
-
 			for _, part := range candidate.Content.Parts {
 				if part.FunctionCall != nil {
 					toolCalls = append(toolCalls, convertToolCallToAPI([]ContentPart{part})...)
@@ -411,6 +464,8 @@ func (c *Client) CreateChatCompletionStream(
 					content.WriteString(part.Text)
 				}
 			}
+		}
+	}
 
 	// If there are function calls, handle them and recurse
 	if len(toolCalls) > 0 {
@@ -420,8 +475,6 @@ func (c *Client) CreateChatCompletionStream(
 		}
 		return c.CreateChatCompletionStream(ctx, params, messages, callback, output)
 	}
-		}
-	}
 
 	if callback != nil {
 		callback(model.Message{