new-api-custom/relaykit/relayconvert/internal/oai_responses/to_oai_chat_resp.go

package oairesponses

import (
	"errors"
	"fmt"
	"strings"

	"github.com/QuantumNous/new-api/relaykit/dto"
	kitutil "github.com/QuantumNous/new-api/relaykit/relayconvert/kitutil"
)

const (
	responsesEventCreated                   = "response.created"
	responsesEventCompleted                 = "response.completed"
	responsesEventDone                      = "response.done"
	responsesEventIncomplete                = "response.incomplete"
	responsesEventFailed                    = "response.failed"
	responsesEventError                     = "response.error"
	responsesEventOutputTextDelta           = "response.output_text.delta"
	responsesEventOutputTextAnnotationAdded = "response.output_text.annotation.added"
	responsesEventOutputItemAdded           = "response.output_item.added"
	responsesEventOutputItemDone            = "response.output_item.done"
	responsesEventFunctionArgsDelta         = "response.function_call_arguments.delta"
	responsesEventFunctionArgsDone          = "response.function_call_arguments.done"
	responsesEventCustomToolInputDelta      = "response.custom_tool_call_input.delta"
	responsesEventCustomToolInputDone       = "response.custom_tool_call_input.done"
	responsesEventReasoningSummaryDelta     = "response.reasoning_summary_text.delta"
	responsesEventReasoningSummaryDone      = "response.reasoning_summary_text.done"
	responsesEventReasoningTextDelta        = "response.reasoning_text.delta"
	responsesEventReasoningTextDone         = "response.reasoning_text.done"
	responsesOutputTypeFunctionCall         = "function_call"
	responsesOutputTypeCustomToolCall       = "custom_tool_call"
	responsesOutputTypeMessage              = "message"
	responsesOutputTypeReasoning            = "reasoning"
	responsesIncompleteReasonContentFilter  = "content_filter"
	responsesIncompleteReasonMaxTokens      = "max_output_tokens"
)

func ResponsesFinishReasonFromStatus(resp *dto.OpenAIResponsesResponse) (string, bool) {
	if resp == nil {
		return "", false
	}

	status := responseStatusString(resp)
	if status != "incomplete" {
		return "", false
	}

	reason := ""
	if resp.IncompleteDetails != nil {
		reason = strings.TrimSpace(resp.IncompleteDetails.Reason)
	}
	if reason == responsesIncompleteReasonContentFilter {
		return "content_filter", true
	}
	return "length", true
}

func ResponsesResponseToChatCompletionsResponse(resp *dto.OpenAIResponsesResponse, id string) (*dto.OpenAITextResponse, *dto.Usage, error) {
	if resp == nil {
		return nil, nil, errors.New("response is nil")
	}

	text := ExtractOutputTextFromResponses(resp)
	reasoning := ExtractReasoningTextFromResponses(resp)

	usage := UsageFromResponsesUsage(resp.Usage)

	created := int64(resp.CreatedAt)

	var toolCalls []dto.ToolCallResponse
	if len(resp.Output) > 0 {
		for _, out := range resp.Output {
			if !isResponsesToolOutputType(out.Type) {
				continue
			}
			name := strings.TrimSpace(out.Name)
			if name == "" {
				continue
			}
			callId := strings.TrimSpace(out.CallId)
			if callId == "" {
				callId = strings.TrimSpace(out.ID)
			}
			toolCalls = append(toolCalls, dto.ToolCallResponse{
				ID:   callId,
				Type: "function",
				Function: dto.FunctionResponse{
					Name:      name,
					Arguments: out.ArgumentsString(),
				},
			})
		}
	}

	finishReason := "stop"
	if mappedReason, ok := ResponsesFinishReasonFromStatus(resp); ok {
		finishReason = mappedReason
	} else if len(toolCalls) > 0 {
		finishReason = "tool_calls"
	}

	msg := dto.Message{
		Role:    "assistant",
		Content: text,
	}
	if annotations, err := responsesAnnotationsToChat(resp); err != nil {
		return nil, nil, err
	} else if len(annotations) > 0 {
		msg.Annotations = annotations
	}
	if reasoning != "" {
		msg.ReasoningContent = &reasoning
	}
	if len(toolCalls) > 0 {
		msg.SetToolCalls(toolCalls)
	}

	out := &dto.OpenAITextResponse{
		Id:      id,
		Object:  "chat.completion",
		Created: created,
		Model:   resp.Model,
		Choices: []dto.OpenAITextResponseChoice{
			{
				Index:        0,
				Message:      msg,
				FinishReason: finishReason,
			},
		},
		Usage: *usage,
	}

	return out, usage, nil
}

func responsesAnnotationsToChat(resp *dto.OpenAIResponsesResponse) ([]byte, error) {
	annotations := make([]any, 0)
	for _, output := range resp.Output {
		if output.Type != responsesOutputTypeMessage {
			continue
		}
		for _, content := range output.Content {
			for _, annotation := range content.Annotations {
				converted, err := responseAnnotationToChat(annotation)
				if err != nil {
					return nil, err
				}
				annotations = append(annotations, converted)
			}
		}
	}
	if len(annotations) == 0 {
		return nil, nil
	}
	return kitutil.Marshal(annotations)
}

func responseAnnotationToChat(annotation any) (map[string]any, error) {
	value, ok := annotation.(map[string]any)
	if !ok {
		converted, err := kitutil.Any2Type[map[string]any](annotation)
		if err != nil {
			return nil, fmt.Errorf("invalid Responses annotation: %w", err)
		}
		value = converted
	}
	if strings.TrimSpace(kitutil.Interface2String(value["type"])) != "url_citation" {
		return value, nil
	}
	citation := make(map[string]any, len(value)-1)
	for key, item := range value {
		if key != "type" {
			citation[key] = item
		}
	}
	return map[string]any{
		"type":         "url_citation",
		"url_citation": citation,
	}, nil
}

func UsageFromResponsesUsage(src *dto.Usage) *dto.Usage {
	return usageFromResponsesUsage(src, true)
}

// NormalizeResponsesUsage maps Responses usage into the shared accounting
// shape without creating a BillingUsage snapshot. Native Responses handlers
// use it so passthrough traffic preserves an existing snapshot but does not
// introduce a conversion sidecar solely for local settlement.
func NormalizeResponsesUsage(src *dto.Usage) *dto.Usage {
	return usageFromResponsesUsage(src, false)
}

func usageFromResponsesUsage(src *dto.Usage, createBillingSnapshot bool) *dto.Usage {
	usage := &dto.Usage{}
	if src == nil {
		return usage
	}
	usage.UsageSemantic = src.UsageSemantic
	usage.UsageSource = src.UsageSource
	usage.BillingUsage = dto.CloneBillingUsage(src.BillingUsage)
	if usage.BillingUsage == nil && createBillingSnapshot {
		usage.BillingUsage = dto.NewOpenAIResponsesBillingUsage(src)
	}
	usage.Cost = src.Cost
	if src.InputTokens != 0 {
		usage.PromptTokens = src.InputTokens
		usage.InputTokens = src.InputTokens
	}
	if src.OutputTokens != 0 {
		usage.CompletionTokens = src.OutputTokens
		usage.OutputTokens = src.OutputTokens
	}
	if src.TotalTokens != 0 {
		usage.TotalTokens = src.TotalTokens
	} else {
		usage.TotalTokens = usage.PromptTokens + usage.CompletionTokens
	}
	if src.InputTokensDetails != nil {
		usage.PromptTokensDetails = src.InputTokensDetails.Clone()
	}
	if src.CompletionTokenDetails.ReasoningTokens != 0 ||
		src.CompletionTokenDetails.TextTokens != 0 ||
		src.CompletionTokenDetails.AudioTokens != 0 ||
		src.CompletionTokenDetails.ImageTokens != 0 {
		usage.CompletionTokenDetails.ReasoningTokens = src.CompletionTokenDetails.ReasoningTokens
		usage.CompletionTokenDetails.TextTokens = src.CompletionTokenDetails.TextTokens
		usage.CompletionTokenDetails.AudioTokens = src.CompletionTokenDetails.AudioTokens
		usage.CompletionTokenDetails.ImageTokens = src.CompletionTokenDetails.ImageTokens
	}
	usage.ClaudeCacheCreation5mTokens = src.ClaudeCacheCreation5mTokens
	usage.ClaudeCacheCreation1hTokens = src.ClaudeCacheCreation1hTokens
	return usage
}

func ExtractOutputTextFromResponses(resp *dto.OpenAIResponsesResponse) string {
	if resp == nil || len(resp.Output) == 0 {
		return ""
	}

	var sb strings.Builder

	// Prefer assistant message outputs.
	for _, out := range resp.Output {
		if out.Type != "message" {
			continue
		}
		if out.Role != "" && out.Role != "assistant" {
			continue
		}
		var outputText strings.Builder
		for _, c := range out.Content {
			if c.Type == "output_text" && c.Text != "" {
				outputText.WriteString(c.Text)
			}
		}
		appendSeparatedText(&sb, outputText.String())
	}
	if sb.Len() > 0 {
		return sb.String()
	}
	for _, out := range resp.Output {
		var outputText strings.Builder
		for _, c := range out.Content {
			if c.Text != "" {
				outputText.WriteString(c.Text)
			}
		}
		appendSeparatedText(&sb, outputText.String())
	}
	return sb.String()
}

func ExtractReasoningTextFromResponses(resp *dto.OpenAIResponsesResponse) string {
	if resp == nil || len(resp.Output) == 0 {
		return ""
	}

	var sb strings.Builder
	for _, out := range resp.Output {
		if out.Type != responsesOutputTypeReasoning {
			continue
		}
		appendSeparatedText(&sb, reasoningOutputText(&out))
	}
	return sb.String()
}

func reasoningOutputText(output *dto.ResponsesOutput) string {
	if output == nil {
		return ""
	}
	var text strings.Builder
	hasContentText := false
	for _, part := range output.Content {
		if part.Text != "" {
			hasContentText = true
			break
		}
	}
	if hasContentText {
		for _, part := range output.Content {
			appendSeparatedText(&text, part.Text)
		}
		return text.String()
	}
	for _, part := range output.Summary {
		appendSeparatedText(&text, part.Text)
	}
	return text.String()
}

func appendSeparatedText(builder *strings.Builder, text string) {
	if builder == nil || text == "" {
		return
	}
	if builder.Len() > 0 {
		current := builder.String()
		trailingNewlines := 0
		for index := len(current) - 1; index >= 0 && trailingNewlines < 2 && current[index] == '\n'; index-- {
			trailingNewlines++
		}
		leadingNewlines := 0
		for leadingNewlines < len(text) && leadingNewlines < 2 && text[leadingNewlines] == '\n' {
			leadingNewlines++
		}
		for missing := 2 - trailingNewlines - leadingNewlines; missing > 0; missing-- {
			builder.WriteByte('\n')
		}
	}
	builder.WriteString(text)
}

func responseStatusString(resp *dto.OpenAIResponsesResponse) string {
	if resp == nil || len(resp.Status) == 0 {
		return ""
	}
	var status string
	_ = kitutil.Unmarshal(resp.Status, &status)
	return strings.TrimSpace(status)
}

func ensureIncompleteResponse(resp *dto.OpenAIResponsesResponse) *dto.OpenAIResponsesResponse {
	if resp == nil {
		resp = &dto.OpenAIResponsesResponse{}
	}
	if len(resp.Status) == 0 {
		resp.Status = []byte(`"incomplete"`)
	}
	return resp
}

func isResponsesToolOutputType(outputType string) bool {
	return outputType == responsesOutputTypeFunctionCall || outputType == responsesOutputTypeCustomToolCall
}

func responseStreamEventItemID(event *dto.ResponsesStreamResponse) string {
	if event == nil {
		return ""
	}
	if event.Item != nil {
		if itemID := strings.TrimSpace(event.Item.ID); itemID != "" {
			return itemID
		}
	}
	return strings.TrimSpace(event.ItemID)
}

func fallbackToolKey(itemID string, callID string, outputIndex *int) string {
	if outputIndex != nil {
		return fmt.Sprintf("output:%d", *outputIndex)
	}
	if strings.TrimSpace(itemID) != "" {
		return "item:" + strings.TrimSpace(itemID)
	}
	if strings.TrimSpace(callID) != "" {
		return "call:" + strings.TrimSpace(callID)
	}
	return ""
}

func fallbackCallID(event *dto.ResponsesStreamResponse) string {
	if event == nil {
		return ""
	}
	if strings.TrimSpace(event.ItemID) != "" {
		return strings.TrimSpace(event.ItemID)
	}
	if event.OutputIndex != nil {
		return fmt.Sprintf("call_output_%d", *event.OutputIndex)
	}
	return ""
}