package executor import (	"bufio"	"bytes"	"context"	"errors"	"fmt"	"io"	"net/http"	"time" 	"github.com/router-for-me/CLIProxyAPI/v7/internal/runtime/executor/helps"	"github.com/router-for-me/CLIProxyAPI/v7/internal/thinking"	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/executor"	sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"	log "github.com/sirupsen/logrus"	"github.com/tidwall/sjson") // ExecuteStream performs a streaming request to the Antigravity API.func (e *AntigravityExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Auth, req cliproxyexecutor.Request, opts cliproxyexecutor.Options) (_ *cliproxyexecutor.StreamResult, err error) {	if opts.Alt == "responses/compact" {		return nil, statusErr{code: http.StatusNotImplemented, msg: "/responses/compact not supported"}	}	baseModel := thinking.ParseSuffix(req.Model).ModelName 	ctx = context.WithValue(ctx, "alt", "")	if inCooldown, remaining, errCooldown := antigravityIsInShortCooldownRequired(ctx, auth, baseModel, time.Now()); errCooldown != nil {		return nil, homeKVUnavailableStatusErr(errCooldown)	} else if inCooldown && !antigravityShouldBypassShortCooldown(ctx, e.cfg) {		log.Debugf("antigravity executor: auth %s in short cooldown for model %s (%s remaining), returning 429 to switch auth", auth.ID, baseModel, remaining)		d := remaining		return nil, statusErr{code: http.StatusTooManyRequests, msg: fmt.Sprintf("auth in short cooldown, %s remaining", remaining), retryAfter: &d}	} 	reporter := helps.NewExecutorUsageReporter(ctx, e, baseModel, auth)	defer reporter.TrackFailure(ctx, &err) 	from := opts.SourceFormat	responseFormat := cliproxyexecutor.ResponseFormatOrSource(opts)	to := sdktranslator.FromString("antigravity") 	originalPayloadSource := req.Payload	if len(opts.OriginalRequest) > 0 {		originalPayloadSource = opts.OriginalRequest	}	originalPayload := originalPayloadSource	originalPayload, errValidate := validateAntigravityRequestSignatures(ctx, baseModel, from, originalPayload)	if errValidate != nil {		return nil, errValidate	}	req.Payload = originalPayload	token, updatedAuth, errToken := e.ensureAccessToken(ctx, auth)	if errToken != nil {		return nil, errToken	}	if updatedAuth != nil {		auth = updatedAuth	} 	originalTranslated := helps.TranslateRequestWithCodexMultiAgentV2(ctx, opts.Headers, e.cfg, from, to, baseModel, originalPayload, true)	translated := helps.TranslateRequestWithCodexMultiAgentV2(ctx, opts.Headers, e.cfg, from, to, baseModel, req.Payload, true) 	translated, err = helps.ApplyThinkingWithSourcePayload(translated, req.Payload, originalPayloadSource, req.Model, from.String(), to.String(), e.Identifier())	if err != nil {		return nil, err	} 	requestedModel := helps.PayloadRequestedModel(opts, req.Model)	requestPath := helps.PayloadRequestPath(opts)	translated = helps.ApplyPayloadConfigWithRequest(e.cfg, baseModel, "antigravity", from.String(), "request", translated, originalTranslated, requestedModel, requestPath, opts.Headers)	translated = sanitizeAntigravityGeminiRequestSignatures(baseModel, translated)	translated, _ = sjson.DeleteBytes(translated, "request.stream")	reporter.SetTranslatedReasoningEffort(translated, to.String()) 	useCredits := cliproxyauth.AntigravityCreditsRequested(ctx) && antigravityCreditsRetryEnabled(e.cfg) 	baseURLs := antigravityBaseURLFallbackOrder(auth)	httpClient := newAntigravityHTTPClient(ctx, e.cfg, auth, 0)	httpClient = reporter.TrackHTTPClient(httpClient) 	attempts := antigravityRetryAttempts(auth, e.cfg) attemptLoop:	for attempt := 0; attempt < attempts; attempt++ {		var lastStatus int		var lastBody []byte		var lastErr error 		for idx, baseURL := range baseURLs {			requestPayload := translated			if useCredits {				if cp := injectEnabledCreditTypes(translated); len(cp) > 0 {					requestPayload = cp					helps.MarkCreditsUsed(ctx)				}			}			replayScope := antigravityReasoningReplayScope{}			if antigravityUsesReasoningReplayCache(baseModel) {				var errReplay error				requestPayload, replayScope, errReplay = prepareAntigravityGeminiReasoningReplayPayload(ctx, baseModel, req, opts, requestPayload)				if errReplay != nil {					err = errReplay					return nil, err				}			}			httpReq, errReq := e.buildRequest(ctx, auth, token, baseModel, requestPayload, true, opts.Alt, baseURL, helps.DerivedAntigravitySessionID(opts.Metadata, req.Metadata))			if errReq != nil {				err = errReq				return nil, err			}			httpResp, errDo := httpClient.Do(httpReq)			if errDo != nil {				helps.RecordAPIResponseError(ctx, e.cfg, errDo)				if errors.Is(errDo, context.Canceled) || errors.Is(errDo, context.DeadlineExceeded) {					return nil, errDo				}				lastStatus = 0				lastBody = nil				lastErr = errDo				if idx+1 < len(baseURLs) {					log.Debugf("antigravity executor: request error on base url %s, retrying with fallback base url: %s", baseURL, baseURLs[idx+1])					continue				}				err = errDo				return nil, err			}			helps.RecordAPIResponseMetadata(ctx, e.cfg, httpResp.StatusCode, httpResp.Header.Clone())			if httpResp.StatusCode < http.StatusOK || httpResp.StatusCode >= http.StatusMultipleChoices {				bodyBytes, errRead := io.ReadAll(httpResp.Body)				if errClose := httpResp.Body.Close(); errClose != nil {					log.Errorf("antigravity executor: close response body error: %v", errClose)				}				if errRead != nil {					helps.RecordAPIResponseError(ctx, e.cfg, errRead)					if errors.Is(errRead, context.Canceled) || errors.Is(errRead, context.DeadlineExceeded) {						err = errRead						return nil, err					}					if errCtx := ctx.Err(); errCtx != nil {						err = errCtx						return nil, err					}					lastStatus = 0					lastBody = nil					lastErr = errRead					if idx+1 < len(baseURLs) {						log.Debugf("antigravity executor: read error on base url %s, retrying with fallback base url: %s", baseURL, baseURLs[idx+1])						continue					}					err = errRead					return nil, err				}				helps.AppendAPIResponseChunk(ctx, e.cfg, bodyBytes)				if httpResp.StatusCode == http.StatusTooManyRequests {					decision := decideAntigravity429(bodyBytes) 					switch decision.kind {					case antigravity429DecisionInstantRetrySameAuth:						if attempt+1 < attempts {							if decision.retryAfter != nil && *decision.retryAfter > 0 {								wait := antigravityInstantRetryDelay(*decision.retryAfter)								log.Debugf("antigravity executor: instant retry for model %s, waiting %s", baseModel, wait)								if errWait := antigravityWait(ctx, wait); errWait != nil {									return nil, errWait								}							}							continue attemptLoop						}					case antigravity429DecisionShortCooldownSwitchAuth:						if decision.retryAfter != nil && *decision.retryAfter > 0 {							if errMarkCooldown := markAntigravityShortCooldownRequired(ctx, auth, baseModel, time.Now(), *decision.retryAfter); errMarkCooldown != nil {								err = homeKVUnavailableStatusErr(errMarkCooldown)								return nil, err							}							log.Debugf("antigravity executor: short quota cooldown (%s) for model %s recorded", *decision.retryAfter, baseModel)						}					case antigravity429DecisionFullQuotaExhausted:						if useCredits && antigravityHasExplicitCreditsBalanceExhaustedReason(bodyBytes) {							markAntigravityCreditsPermanentlyDisabled(auth)						}						// No credits logic - just fall through to error return below					}				} 				lastStatus = httpResp.StatusCode				lastBody = append([]byte(nil), bodyBytes...)				lastErr = nil				if httpResp.StatusCode == http.StatusTooManyRequests && idx+1 < len(baseURLs) {					log.Debugf("antigravity executor: rate limited on base url %s, retrying with fallback base url: %s", baseURL, baseURLs[idx+1])					continue				}				if antigravityShouldRetryTransientResourceExhausted429(httpResp.StatusCode, bodyBytes) && attempt+1 < attempts {					delay := antigravityTransient429RetryDelay(attempt)					log.Debugf("antigravity executor: transient 429 resource exhausted for model %s, retrying in %s (attempt %d/%d)", baseModel, delay, attempt+1, attempts)					if errWait := antigravityWait(ctx, delay); errWait != nil {						return nil, errWait					}					continue attemptLoop				}				if antigravityShouldRetryNoCapacity(httpResp.StatusCode, bodyBytes) {					if idx+1 < len(baseURLs) {						log.Debugf("antigravity executor: no capacity on base url %s, retrying with fallback base url: %s", baseURL, baseURLs[idx+1])						continue					}					if attempt+1 < attempts {						delay := antigravityNoCapacityRetryDelay(attempt)						log.Debugf("antigravity executor: no capacity for model %s, retrying in %s (attempt %d/%d)", baseModel, delay, attempt+1, attempts)						if errWait := antigravityWait(ctx, delay); errWait != nil {							return nil, errWait						}						continue attemptLoop					}				}				if antigravityShouldRetrySoftRateLimit(httpResp.StatusCode, bodyBytes) {					if attempt+1 < attempts {						delay := antigravitySoftRateLimitDelay(attempt)						log.Debugf("antigravity executor: soft rate limit for model %s, retrying in %s (attempt %d/%d)", baseModel, delay, attempt+1, attempts)						if errWait := antigravityWait(ctx, delay); errWait != nil {							return nil, errWait						}						continue attemptLoop					}				}				if errClear := clearAntigravityReasoningReplayOnInvalidSignature(ctx, replayScope, httpResp.StatusCode, bodyBytes); errClear != nil {					// Report the upstream failure rather than the cleanup failure.					logAntigravityReasoningReplayDegraded(replayScope, "invalidate", errClear)				}				err = newAntigravityStatusErr(httpResp.StatusCode, bodyBytes)				return nil, err			} 			// Stream success			if useCredits {				clearAntigravityCreditsFailureState(auth)			}			replayAccumulator := newAntigravityReasoningReplayAccumulator(replayScope, requestPayload)			out := make(chan cliproxyexecutor.StreamChunk)			go func(resp *http.Response) {				defer close(out)				defer func() {					if errClose := resp.Body.Close(); errClose != nil {						log.Errorf("antigravity executor: close response line error: %v", errClose)					}				}()				scanner := bufio.NewScanner(resp.Body)				scanner.Buffer(nil, streamScannerBuffer)				claudeInputTokens := helps.NewClaudeInputTokenState(from, to, responseFormat, originalPayload)				var param any				for scanner.Scan() {					line := scanner.Bytes()					helps.AppendAPIResponseChunk(ctx, e.cfg, line)					if replayAccumulator != nil {						replayAccumulator.ObserveSSELine(line)					} 					// Filter usage metadata for all models					// Only retain usage statistics in the terminal chunk					line = helps.FilterSSEUsageMetadata(line) 					payload := helps.JSONPayload(line)					if payload == nil {						continue					} 					if detail, ok := helps.ParseAntigravityStreamUsage(payload); ok {						reporter.Publish(ctx, detail)					} 					payload = e.resolveWebSearchGroundingURLs(ctx, auth, from, originalPayload, translated, payload)					chunks := helps.TranslateStreamWithClaudeInputTokens(ctx, to, responseFormat, req.Model, opts.OriginalRequest, translated, bytes.Clone(payload), &param, claudeInputTokens)					for i := range chunks {						select {						case out <- cliproxyexecutor.StreamChunk{Payload: chunks[i]}:						case <-ctx.Done():							return						}					}				}				tail := helps.TranslateStreamWithClaudeInputTokens(ctx, to, responseFormat, req.Model, opts.OriginalRequest, translated, []byte("[DONE]"), &param, claudeInputTokens)				for i := range tail {					select {					case out <- cliproxyexecutor.StreamChunk{Payload: tail[i]}:					case <-ctx.Done():						return					}				}				if errScan := scanner.Err(); errScan != nil {					helps.RecordAPIResponseError(ctx, e.cfg, errScan)					reporter.PublishFailure(ctx, errScan)					select {					case out <- cliproxyexecutor.StreamChunk{Err: errScan}:					case <-ctx.Done():					}				} else {					if replayAccumulator != nil {						replayAccumulator.Commit(ctx)					}					reporter.EnsurePublished(ctx)				}			}(httpResp)			return &cliproxyexecutor.StreamResult{Headers: httpResp.Header.Clone(), Chunks: out}, nil		} 		switch {		case lastStatus != 0:			err = newAntigravityStatusErr(lastStatus, lastBody)		case lastErr != nil:			err = lastErr		default:			err = statusErr{code: http.StatusServiceUnavailable, msg: "antigravity executor: no base url available"}		}		return nil, err	} 	return nil, err}