package agent

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"log/slog"
	"slices"
	"strconv"
	"strings"
	"time"

	"github.com/google/uuid"

	"github.com/nextlevelbuilder/goclaw/internal/bootstrap"
	"github.com/nextlevelbuilder/goclaw/internal/config"
	"github.com/nextlevelbuilder/goclaw/internal/i18n"
	"github.com/nextlevelbuilder/goclaw/internal/pipeline"
	"github.com/nextlevelbuilder/goclaw/internal/providers"
	"github.com/nextlevelbuilder/goclaw/internal/store"
	"github.com/nextlevelbuilder/goclaw/internal/tools"
	"github.com/nextlevelbuilder/goclaw/internal/tracing"
	usagecaps "github.com/nextlevelbuilder/goclaw/internal/usage/caps"
	"github.com/nextlevelbuilder/goclaw/internal/workspace"
	"github.com/nextlevelbuilder/goclaw/pkg/protocol"
)

// pipelineCallbacks creates all callback closures that capture *Loop.
// Each callback bridges a pipeline.PipelineDeps function to an existing Loop method.
func (l *Loop) pipelineCallbacks(req *RunRequest, bridgeRS *runState) pipelineCallbackSet {
	// Shared emitRun enriches events with routing context (matching v2 pattern).
	emitRun := func(event AgentEvent) {
		event.RunKind = req.RunKind
		event.DelegationID = req.DelegationID
		event.TeamID = req.TeamID
		event.TeamTaskID = req.TeamTaskID
		event.ParentAgentID = req.ParentAgentID
		event.SenderID = req.SenderID
		event.UserID = req.UserID
		event.Channel = req.Channel
		event.ChatID = req.ChatID
		event.SessionKey = req.SessionKey
		event.TenantID = l.tenantID
		l.emit(redactDelegationAgentEvent(req, event))
	}
	return pipelineCallbackSet{
		emitRun:            emitRun,
		injectContext:      l.makeInjectContext(req),
		loadSessionHistory: l.makeLoadSessionHistory(),
		resolveWorkspace:   l.makeResolveWorkspace(req),
		loadContextFiles:   l.makeLoadContextFiles(),
		buildMessages:      l.makeBuildMessages(req),
		enrichMedia:        l.makeEnrichMedia(req),
		injectReminders:    l.makeInjectReminders(req),
		buildFilteredTools: l.makeBuildFilteredTools(req),
		callLLM:            l.makeCallLLM(req, emitRun),
		pruneMessages:      l.makePruneMessages(),
		sanitizeHistory:    sanitizeHistory,
		compactMessages:    l.makeCompactMessages(req),
		runMemoryFlush:     l.makeRunMemoryFlush(),
		executeToolCall:    l.makeExecuteToolCall(req, bridgeRS),
		executeToolRaw:     l.makeExecuteToolRaw(req),
		processToolResult:  l.makeProcessToolResult(req, bridgeRS),
		authorizeToolCall:  l.makeAuthorizeToolCall(),
		checkReadOnly:      l.makeCheckReadOnly(req, bridgeRS),
		sanitizeContent:    SanitizeAssistantContent,
		flushMessages:      l.makeFlushMessages(req),
		updateMetadata:     l.makeUpdateMetadata(req),
		bootstrapCleanup:   l.makeBootstrapCleanup(),
		maybeSummarize:     l.maybeSummarize,
	}
}

// pipelineCallbackSet groups all typed callbacks for PipelineDeps.
type pipelineCallbackSet struct {
	emitRun            func(AgentEvent)
	injectContext      func(ctx context.Context, input *pipeline.RunInput) (context.Context, error)
	loadSessionHistory func(ctx context.Context, sessionKey string) ([]providers.Message, string)
	resolveWorkspace   func(ctx context.Context, input *pipeline.RunInput) (*workspace.WorkspaceContext, error)
	loadContextFiles   func(ctx context.Context, userID string) ([]bootstrap.ContextFile, bool)
	buildMessages      func(ctx context.Context, input *pipeline.RunInput, history []providers.Message, summary string) ([]providers.Message, error)
	enrichMedia        func(ctx context.Context, state *pipeline.RunState) error
	injectReminders    func(ctx context.Context, input *pipeline.RunInput, msgs []providers.Message) []providers.Message
	buildFilteredTools func(state *pipeline.RunState) ([]providers.ToolDefinition, error)
	callLLM            func(ctx context.Context, state *pipeline.RunState, req providers.ChatRequest) (*providers.ChatResponse, error)
	pruneMessages      func(msgs []providers.Message, budget int) ([]providers.Message, pipeline.PruneStats)
	sanitizeHistory    func(msgs []providers.Message) ([]providers.Message, int)
	compactMessages    func(ctx context.Context, msgs []providers.Message, model string) ([]providers.Message, error)
	runMemoryFlush     func(ctx context.Context, state *pipeline.RunState) error
	executeToolCall    func(ctx context.Context, state *pipeline.RunState, tc providers.ToolCall) ([]providers.Message, error)
	executeToolRaw     func(ctx context.Context, tc providers.ToolCall) (providers.Message, any, error)
	processToolResult  func(ctx context.Context, state *pipeline.RunState, tc providers.ToolCall, rawMsg providers.Message, rawData any) []providers.Message
	authorizeToolCall  func(ctx context.Context, state *pipeline.RunState, tc providers.ToolCall) (bool, string)
	checkReadOnly      func(state *pipeline.RunState) (*providers.Message, bool)
	sanitizeContent    func(string) string
	flushMessages      func(ctx context.Context, sessionKey string, msgs []providers.Message) error
	updateMetadata     func(ctx context.Context, sessionKey string, usage, lastUsage providers.Usage, msgCount int) error
	bootstrapCleanup   func(ctx context.Context, state *pipeline.RunState) error
	maybeSummarize     func(ctx context.Context, sessionKey string, midLoopCompacted bool)
}

func (l *Loop) makeResolveWorkspace(req *RunRequest) func(ctx context.Context, input *pipeline.RunInput) (*workspace.WorkspaceContext, error) {
	resolver := workspace.NewResolver()
	return func(ctx context.Context, input *pipeline.RunInput) (*workspace.WorkspaceContext, error) {
		var teamID *string
		if input.TeamID != "" {
			teamID = &input.TeamID
		}
		return resolver.Resolve(ctx, workspace.ResolveParams{
			AgentID:   l.id,
			AgentType: l.agentType,
			UserID:    input.UserID,
			ChatID:    input.ChatID,
			TenantID:  l.tenantID.String(),
			PeerKind:  input.PeerKind,
			TeamID:    teamID,
			BaseDir:   l.workspace,
		})
	}
}

func (l *Loop) makeLoadContextFiles() func(ctx context.Context, userID string) ([]bootstrap.ContextFile, bool) {
	return func(ctx context.Context, userID string) ([]bootstrap.ContextFile, bool) {
		files := l.resolveContextFiles(ctx, userID)
		hadBootstrap := false
		for _, f := range files {
			if strings.HasSuffix(f.Path, "BOOTSTRAP.md") {
				hadBootstrap = true
				break
			}
		}
		return files, hadBootstrap
	}
}

func (l *Loop) makeBuildMessages(req *RunRequest) func(ctx context.Context, input *pipeline.RunInput, history []providers.Message, summary string) ([]providers.Message, error) {
	return func(ctx context.Context, input *pipeline.RunInput, history []providers.Message, summary string) ([]providers.Message, error) {
		if prompt := buildTeamWorkDirectivePrompt(req.TeamWorkDirective); prompt != "" {
			if input.ExtraSystemPrompt != "" {
				input.ExtraSystemPrompt += "\n\n"
			}
			input.ExtraSystemPrompt += prompt
		}
		msgs, _ := l.buildMessages(ctx, history, summary,
			input.Message, input.ExtraSystemPrompt,
			input.SessionKey, input.Channel, input.ChannelType,
			input.BitrixPortalDomain,
			input.ChatTitle, input.ChatID, input.PeerKind, input.UserID, input.SenderName,
			input.HistoryLimit, input.SkillFilter, input.LightContext, input.TelegramManagerPermissions)
		return msgs, nil
	}
}

// makeInjectContext wraps injectContext() for the v3 pipeline.
// Reuses the existing injectContext() to avoid logic duplication.
// NOTE: injectContext() and this callback must stay in sync when new context values are added.
func (l *Loop) makeInjectContext(req *RunRequest) func(ctx context.Context, input *pipeline.RunInput) (context.Context, error) {
	return func(ctx context.Context, input *pipeline.RunInput) (context.Context, error) {
		result, err := l.injectContext(ctx, req)
		if err != nil {
			return ctx, err
		}
		// Sync message truncation from req back to pipeline input.
		input.Message = req.Message
		// Cache context window on session (first run only).
		if l.sessions.GetContextWindow(result.ctx, req.SessionKey) <= 0 {
			l.sessions.SetContextWindow(result.ctx, req.SessionKey, l.contextWindow)
		}
		return result.ctx, nil
	}
}

// makeLoadSessionHistory loads session history + summary before BuildMessages.
func (l *Loop) makeLoadSessionHistory() func(ctx context.Context, sessionKey string) ([]providers.Message, string) {
	return func(ctx context.Context, sessionKey string) ([]providers.Message, string) {
		history := l.sessions.GetHistory(ctx, sessionKey)
		summary := l.sessions.GetSummary(ctx, sessionKey)
		return history, summary
	}
}

func (l *Loop) makeEnrichMedia(req *RunRequest) func(ctx context.Context, state *pipeline.RunState) error {
	return func(ctx context.Context, state *pipeline.RunState) error {
		// enrichInputMedia enriches messages in-place: attaches inline images,
		// reloads historical media, enriches <media:*> tags, populates context
		// with refs for tool access. Must receive actual messages (not nil) to
		// avoid index-out-of-range panic on inline image attachment.
		msgs := state.Messages.All()
		if len(msgs) == 0 {
			return nil
		}
		enrichedCtx, enrichedMsgs, currentRefs := l.enrichInputMedia(ctx, req, msgs)
		// Propagate enriched context (media images/docs/audio/video refs for tools).
		state.Ctx = enrichedCtx
		// Update history with enriched messages (media tags, inline images).
		// Skip system message (index 0) — only history + user messages are enriched.
		if len(enrichedMsgs) > 1 {
			state.Messages.SetHistory(enrichedMsgs[1:])
		}
		// Preserve the enriched current input for the first session checkpoint.
		// Inline image bytes stay request-local; durable history stores only the
		// logical tags plus absolute MediaRefs used internally for exact lookup.
		if len(currentRefs) > 0 {
			for i := len(enrichedMsgs) - 1; i >= 0; i-- {
				if enrichedMsgs[i].Role != "user" {
					continue
				}
				req.enrichedInputMessage = providers.Message{
					Role:      "user",
					Content:   enrichedMsgs[i].Content,
					MediaRefs: append([]providers.MediaRef(nil), currentRefs...),
				}
				req.hasEnrichedInputMessage = true
				break
			}
		}
		return nil
	}
}

func (l *Loop) makeInjectReminders(req *RunRequest) func(ctx context.Context, input *pipeline.RunInput, msgs []providers.Message) []providers.Message {
	return func(ctx context.Context, input *pipeline.RunInput, msgs []providers.Message) []providers.Message {
		updated, _ := l.injectTeamTaskReminders(ctx, req, msgs)
		return updated
	}
}

func (l *Loop) makeBuildFilteredTools(req *RunRequest) func(state *pipeline.RunState) ([]providers.ToolDefinition, error) {
	// Per-run cache: all filtering inputs (policy, disabled tools, bootstrap,
	// channel, orchestration mode, user MCP tools) are fixed for the lifetime
	// of a run. Only the final iteration differs (strips all tools). Cache the
	// result after the first call and reuse for iterations 0..maxIter-1.
	var (
		cachedToolDefs []providers.ToolDefinition
		cacheValid     bool
	)
	return func(state *pipeline.RunState) ([]providers.ToolDefinition, error) {
		maxIter := l.maxIterations
		if req.MaxIterations > 0 && req.MaxIterations < maxIter {
			maxIter = req.MaxIterations
		}

		// Cache hit: reuse tool defs from first call for non-final iterations.
		if cacheValid && state.Iteration != maxIter {
			return cachedToolDefs, nil
		}

		// Load per-user MCP tools (Notion, etc.) into registry before filtering.
		// Servers with require_user_credentials are deferred at startup and
		// connected per-request here with the actual user's credentials.
		//
		// Prefer CredentialUserID from context — resolveCredentialUserID already
		// resolved the merged tenant_user identity (e.g. Telegram group merged
		// to a tenant_user via UI). Using the raw SenderID or group composite
		// as the cache key would miss the credential row keyed by the merged
		// tenant_user UUID. Fall back to resolveActorUserID for channels without
		// merge resolution (backward compat). See resolveActorUserID docstring
		// for the group-rewrite recovery rationale.
		actorUserID := store.CredentialUserIDFromContext(state.Ctx)
		if actorUserID == "" {
			actorUserID = resolveActorUserID(
				state.Input.UserID,
				state.Input.SenderID,
				state.Input.PeerKind,
				state.Input.ChannelType,
			)
		}
		userTools := l.getUserMCPTools(state.Ctx, actorUserID)
		slog.Debug("mcp.user_tools_context",
			"peer_kind", state.Input.PeerKind,
			"input_user_id", state.Input.UserID,
			"sender_id", state.Input.SenderID,
			"actor_user_id", actorUserID,
			"user_tools_count", len(userTools))
		allMsgs := state.Messages.All()
		toolDefs, _, returnedMsgs := l.buildFilteredTools(req, state.Context.HadBootstrap,
			state.Iteration, maxIter, allMsgs, userTools)
		// buildFilteredTools returns the full messages slice; only messages appended
		// beyond the original length are injections (e.g. final-iteration hint).
		// Appending the entire slice would duplicate system+history into pending.
		if len(returnedMsgs) > len(allMsgs) {
			for _, msg := range returnedMsgs[len(allMsgs):] {
				state.Messages.AppendPending(msg)
			}
		}

		// Cache store after first successful non-final call.
		if !cacheValid && state.Iteration != maxIter {
			cachedToolDefs = toolDefs
			cacheValid = true
		}

		slog.Debug("mcp.filtered_tools",
			"tool_defs_count", len(toolDefs),
			"mcp_defs_count", countMCPToolDefs(toolDefs),
			"iteration", state.Iteration)
		return toolDefs, nil
	}
}

// countMCPToolDefs counts MCP-bridged tool definitions (name prefix "mcp_").
// It skips entries with a nil Function — e.g. the native image_generation
// sentinel providers.ToolDefinition{Type: "image_generation"} — which would
// otherwise nil-deref (the v3.14.0 panic on every message for codex agents).
func countMCPToolDefs(toolDefs []providers.ToolDefinition) int {
	n := 0
	for _, td := range toolDefs {
		if td.Function == nil {
			continue
		}
		if strings.HasPrefix(strings.TrimSpace(td.Function.Name), "mcp_") {
			n++
		}
	}
	return n
}

// makeAuthorizeToolCall enforces a runtime fail-closed allowlist check before
// every tool execution. AllowedTools is keyed by canonical registry names (built
// by ThinkStage from FilterTools output). The model may emit prefixed names when
// the agent has toolCallPrefix configured (e.g. "proxy_exec" → canonical "exec"),
// so we resolve the name to its canonical form before the lookup to avoid a
// guaranteed miss on every prefixed call.
func (l *Loop) makeAuthorizeToolCall() func(ctx context.Context, state *pipeline.RunState, tc providers.ToolCall) (bool, string) {
	return func(_ context.Context, state *pipeline.RunState, tc providers.ToolCall) (bool, string) {
		allowed := state.Tool.AllowedTools
		if allowed == nil {
			// nil allowlist means no per-iteration restriction (e.g. BuildFilteredTools not wired).
			return true, ""
		}

		// Resolve to canonical name before allowlist lookup. AllowedTools is keyed
		// by canonical names; the model may emit prefixed names when toolCallPrefix
		// is set (e.g. "proxy_exec" vs "exec"). Without this the lookup always misses.
		name := l.resolveToolCallName(tc.Name)

		if allowed[name] {
			return true, ""
		}

		// Preserve lazy activation for deferred tools (typically per-user MCP).
		if l.tools != nil && l.tools.TryActivateDeferred(name) {
			// Re-check deny policy to prevent a lazy-activated tool from bypassing
			// an explicit deny rule.
			if l.toolPolicy != nil && l.toolPolicy.IsDenied(tools.ResolveConcreteRegistry(l.tools), name, l.agentToolPolicy) {
				return false, "tool not allowed by policy: " + name
			}
			allowed[name] = true
			return true, ""
		}

		return false, "tool not allowed by policy: " + name
	}
}

// allowedToolNamesSlice converts a policy-filtered allowed-tool set into a
// sorted slice for deterministic downstream consumption (e.g. Claude CLI
// --disallowedTools derivation).
func allowedToolNamesSlice(allowed map[string]bool) []string {
	names := make([]string, 0, len(allowed))
	for name := range allowed {
		names = append(names, name)
	}
	slices.Sort(names)
	return names
}

func (l *Loop) makeCallLLM(req *RunRequest, emitRun func(AgentEvent)) func(ctx context.Context, state *pipeline.RunState, chatReq providers.ChatRequest) (*providers.ChatResponse, error) {
	return func(ctx context.Context, state *pipeline.RunState, chatReq providers.ChatRequest) (*providers.ChatResponse, error) {
		provider := state.Provider
		model := state.Model

		// Issue 3: surface transient provider retries to the user ("Provider busy,
		// retrying...") instead of a silent failure ending in a 💔 reaction. The
		// providers' internal RetryDo / codex loops fire this hook before each retry
		// attempt; the channel layer turns run.retrying into a placeholder update.
		ctx = providers.WithRetryHook(ctx, func(attempt, maxAttempts int, _ error) {
			emitRun(AgentEvent{
				Type:    protocol.AgentEventRunRetrying,
				AgentID: l.id,
				RunID:   req.RunID,
				Payload: map[string]string{
					"attempt":     strconv.Itoa(attempt),
					"maxAttempts": strconv.Itoa(maxAttempts),
				},
			})
		})

		// Enrich ChatRequest options to match v2 (providers need these for caching, routing, audit).
		if chatReq.Options == nil {
			chatReq.Options = make(map[string]any)
		}
		chatReq.Options[providers.OptTemperature] = config.DefaultTemperature
		chatReq.Options[providers.OptSessionKey] = req.SessionKey
		chatReq.Options[providers.OptAgentID] = l.agentUUID.String()
		chatReq.Options[providers.OptUserID] = req.UserID
		chatReq.Options[providers.OptChannel] = req.Channel
		chatReq.Options[providers.OptChatID] = req.ChatID
		chatReq.Options[providers.OptPeerKind] = req.PeerKind
		chatReq.Options[providers.OptLocalKey] = req.LocalKey
		chatReq.Options[providers.OptWorkspace] = tools.ToolWorkspaceFromCtx(ctx)
		if delegationID := tools.DelegationIDFromCtx(ctx); delegationID != "" {
			chatReq.Options[providers.OptDelegationID] = delegationID
		}
		if inputs := tools.DelegationArtifactInputsFromCtx(ctx); inputs != "" {
			chatReq.Options[providers.OptDelegationInputs] = inputs
		}
		// Pass the policy-filtered allowed tool set so the Claude CLI provider
		// can restrict its native built-in tools (Bash, Edit, Write, Read,
		// WebFetch, WebSearch) to what the agent's tool policy actually allows.
		// A nil state.Tool.AllowedTools means BuildFilteredTools didn't run
		// (not wired) — do NOT set the option in that case, so the CLI
		// provider's own fail-closed default (nil -> no tools allowed) applies
		// rather than silently omitting the flag.
		if state.Tool.AllowedTools != nil {
			chatReq.Options[providers.OptAllowedToolNames] = allowedToolNamesSlice(state.Tool.AllowedTools)
		}
		tenantID := store.TenantIDFromContext(ctx)
		if tenantID != uuid.Nil {
			chatReq.Options[providers.OptTenantID] = tenantID.String()
		}
		if supportsPromptCacheParams(provider) {
			setDefaultPromptCacheOptions(chatReq.Options, tenantID, l.agentUUID, provider.Name(), req.SessionKey)
		}

		// Reasoning decision: resolve effort level for thinking models (o3, DeepSeek-R1, Kimi).
		reasoningDecision := providers.ResolveReasoningDecision(
			provider, model,
			l.reasoningConfig.Effort,
			l.reasoningConfig.Fallback,
			l.reasoningConfig.Source,
		)
		if effort := reasoningDecision.RequestEffort(); effort != "" {
			chatReq.Options[providers.OptThinkingLevel] = effort
		}
		if reasoningDecision.StripThinking {
			chatReq.Options[providers.OptStripThinking] = true
		}

		// Emit LLM span start for tracing.
		start := time.Now().UTC()
		var opts []spanOption
		if state.Model != "" {
			opts = append(opts, withModel(state.Model))
		}
		if provider != nil {
			opts = append(opts, withProvider(provider.Name()))
		}
		spanID := l.emitLLMSpanStart(ctx, start, state.Iteration+1, chatReq.Messages, opts...)
		if spanID != uuid.Nil {
			state.CurrentLLMSpanID = &spanID
		}
		recordUsageCapAttempt := func(reservation *usagecaps.Reservation) {
			if reservation != nil {
				opts = append(opts, withUsageCapMetadata(reservation.TraceMetadata()))
			}
		}

		streamThinkingEmitted := false
		emitChunk := func(chunk providers.StreamChunk) {
			if chunk.Thinking != "" {
				streamThinkingEmitted = true
				emitRun(AgentEvent{
					Type:    protocol.ChatEventThinking,
					AgentID: l.id,
					RunID:   req.RunID,
					Payload: map[string]string{"content": chunk.Thinking},
				})
			}
			if chunk.Content != "" {
				emitRun(AgentEvent{
					Type:    protocol.ChatEventChunk,
					AgentID: l.id,
					RunID:   req.RunID,
					Payload: map[string]string{"content": chunk.Content},
				})
			}
		}
		fallbackTraceClassifier := providers.NewDefaultClassifier()
		callProvider := func(attempt string, request providers.ChatRequest) (*providers.ChatResponse, error) {
			if fallbackProvider, ok := provider.(*providers.ModelFallbackProvider); ok {
				before := func(callCtx context.Context, entry providers.FallbackCandidate, actualReq providers.ChatRequest) (providers.FallbackAfterCall, error) {
					candidateAttempt := fmt.Sprintf("%s:%s:%s", attempt, entry.ProviderName, actualReq.Model)
					reservation, reserveErr := l.reserveLLMUsageFor(callCtx, req, state.Iteration, actualReq, candidateAttempt, entry.ProviderName, actualReq.Model)
					if reserveErr != nil {
						recordUsageCapAttempt(reservation)
						return nil, reserveErr
					}
					return func(callResp *providers.ChatResponse, callErr error, info providers.FallbackCallInfo) {
						fallbackMeta := providers.ModelFallbackAttemptMetadata{
							ProviderName: entry.ProviderName,
							Model:        actualReq.Model,
							Status:       "success",
							Streamed:     info.Streamed,
						}
						if callErr != nil {
							classification := providers.ClassifyHTTPError(fallbackTraceClassifier, callErr)
							reason := string(classification.Reason)
							if classification.Kind == "context_overflow" {
								reason = "context_overflow"
							}
							fallbackMeta.Status = "error"
							fallbackMeta.Reason = reason
							fallbackMeta.Error = callErr.Error()
						} else {
							opts = append(opts, withProvider(entry.ProviderName), withModel(actualReq.Model))
						}
						opts = append(opts, withModelFallbackAttempt(fallbackMeta))
						if reservation != nil {
							if info.Streamed {
								reservation.ReconcileStream(callCtx, callResp, callErr, true)
							} else {
								reservation.Reconcile(callCtx, callResp, callErr)
							}
							recordUsageCapAttempt(reservation)
						}
					}, nil
				}
				if req.Stream {
					return fallbackProvider.ChatStreamWithHook(ctx, request, emitChunk, before)
				}
				return fallbackProvider.ChatWithHook(ctx, request, before)
			}
			reservation, reserveErr := l.reserveLLMUsage(ctx, req, state, request, attempt)
			if reserveErr != nil {
				recordUsageCapAttempt(reservation)
				return nil, reserveErr
			}
			var callResp *providers.ChatResponse
			var callErr error
			if req.Stream {
				streamed := false
				callResp, callErr = provider.ChatStream(ctx, request, func(chunk providers.StreamChunk) {
					if chunk.Content != "" || chunk.Thinking != "" || len(chunk.Images) > 0 {
						streamed = true
					}
					emitChunk(chunk)
				})
				if reservation != nil {
					reservation.ReconcileStream(ctx, callResp, callErr, streamed)
					recordUsageCapAttempt(reservation)
				}
				return callResp, callErr
			} else {
				callResp, callErr = provider.Chat(ctx, request)
			}
			if reservation != nil {
				reservation.Reconcile(ctx, callResp, callErr)
				recordUsageCapAttempt(reservation)
			}
			return callResp, callErr
		}

		resp, err := callProvider("initial", chatReq)
		slog.Info("debug.llm.first_response",
			"has_error", err != nil,
			"tool_calls_count", func() int {
				if resp == nil {
					return -1
				}
				return len(resp.ToolCalls)
			}(),
			"tools_provided", len(chatReq.Tools))

		if err == nil && teamWorkDirectiveNeedsRetry(req.TeamWorkDirective, state.Iteration, resp) {
			retryReq := buildTeamWorkDirectiveRetryRequest(chatReq, req.TeamWorkDirective)
			resp, err = callProvider("team-work-directive-retry", retryReq)
			slog.Info("team_work_classify: directive retry response",
				"has_error", err != nil,
				"required_tool", req.TeamWorkDirective.normalizedRequiredTool(),
				"tool_calls_count", func() int {
					if resp == nil {
						return -1
					}
					return len(resp.ToolCalls)
				}())
			if err == nil && teamWorkDirectiveNeedsRetry(req.TeamWorkDirective, state.Iteration, resp) {
				resp = &providers.ChatResponse{
					Content:      teamWorkDirectiveBlocker(req.TeamWorkDirective),
					FinishReason: "stop",
				}
			}
		}

		// One guarded retry when MCP task tools are available but the model
		// returns text-only instead of tool calls.
		retryEligible := req.TeamWorkDirective == nil && err == nil && resp != nil && len(resp.ToolCalls) == 0 && shouldRetryTaskMCP(chatReq)
		slog.Info("debug.llm.retry_guard", "retry_eligible", retryEligible)
		if retryEligible {
			retryReq := chatReq
			if retryReq.Options == nil {
				retryReq.Options = make(map[string]any)
			}
			retryReq.Options[providers.OptToolChoice] = "required"
			retryReq.Messages = append(append([]providers.Message{}, chatReq.Messages...), providers.Message{
				Role:    "system",
				Content: "MCP task tools are available in this turn. Do not ask for CRM identifier/email first. Call the relevant MCP task tool immediately, then answer with the tool result.",
			})
			resp, err = callProvider("retry-tool-choice", retryReq)
			slog.Info("debug.llm.retry_response",
				"has_error", err != nil,
				"tool_calls_count", func() int {
					if resp == nil {
						return -1
					}
					return len(resp.ToolCalls)
				}())
		}

		if req.Stream && err == nil && resp != nil && resp.Thinking != "" && !streamThinkingEmitted {
			emitRun(AgentEvent{
				Type:    protocol.ChatEventThinking,
				AgentID: l.id,
				RunID:   req.RunID,
				Payload: map[string]string{"content": resp.Thinking},
			})
		}

		// Non-streaming: emit content events matching v2 behavior (channels need these).
		if !req.Stream && err == nil && resp != nil {
			if resp.Thinking != "" {
				emitRun(AgentEvent{
					Type:    protocol.ChatEventThinking,
					AgentID: l.id,
					RunID:   req.RunID,
					Payload: map[string]string{"content": resp.Thinking},
				})
			}
			if resp.Content != "" {
				emitRun(AgentEvent{
					Type:    protocol.ChatEventChunk,
					AgentID: l.id,
					RunID:   req.RunID,
					Payload: map[string]string{"content": resp.Content},
				})
			}
		}
		l.emitLLMSpanEnd(ctx, spanID, start, resp, err, opts...)
		if err == nil && resp != nil && resp.Usage != nil {
			effModel, effProvider := l.resolveSpan(opts)
			state.AppendCall(providers.CallUsage{
				Type:     "llm_call",
				Name:     fmt.Sprintf("%s/%s #%d", effProvider, effModel, state.Iteration+1),
				Provider: effProvider,
				Model:    effModel,
				Usage:    *resp.Usage,
				CostUSD:  l.calculateLLMCost(ctx, effProvider, effModel, resp.Usage),
			})
		}
		return resp, err
	}
}

func shouldRetryTaskMCP(chatReq providers.ChatRequest) bool {
	hasTaskMCPTool := false
	for _, td := range chatReq.Tools {
		if td.Function == nil {
			continue
		}
		name := strings.TrimSpace(td.Function.Name)
		if strings.HasPrefix(name, "mcp_bx24__") && (strings.Contains(name, "search") || strings.Contains(name, "execute")) {
			hasTaskMCPTool = true
			break
		}
	}
	if !hasTaskMCPTool {
		return false
	}
	lastUser := ""
	for i := len(chatReq.Messages) - 1; i >= 0; i-- {
		if chatReq.Messages[i].Role == "user" {
			lastUser = strings.ToLower(strings.TrimSpace(chatReq.Messages[i].Content))
			break
		}
	}
	if lastUser == "" {
		return false
	}
	return strings.Contains(lastUser, "task") || strings.Contains(lastUser, "việc") || strings.Contains(lastUser, "công việc")
}

func (l *Loop) makePruneMessages() func(msgs []providers.Message, budget int) ([]providers.Message, pipeline.PruneStats) {
	return func(msgs []providers.Message, budget int) ([]providers.Message, pipeline.PruneStats) {
		var stats pipeline.PruneStats
		pruned := pruneContextMessages(msgs, budget, l.contextPruningCfg, l.tokenCounter, l.model, &stats)
		return pruned, stats
	}
}

func (l *Loop) makeCompactMessages(req *RunRequest) func(ctx context.Context, msgs []providers.Message, model string) ([]providers.Message, error) {
	return func(ctx context.Context, msgs []providers.Message, model string) ([]providers.Message, error) {
		start := time.Now().UTC()
		compacted := l.compactMessagesInPlace(ctx, msgs)
		outcome := "compacted"
		if compacted == nil {
			outcome = "not_compacted"
		}
		tracing.EmitEventSpan(ctx, "mid_loop_compaction", start, nil, map[string]any{
			"outcome":         outcome,
			"input_messages":  len(msgs),
			"output_messages": len(compacted),
		})
		if compacted == nil {
			return nil, pipeline.ErrNotCompacted
		}
		// Stamp session metadata with the compaction timestamp so operators
		// can diagnose compaction cadence without a dedicated column. Stored
		// as RFC3339 string in sessions.metadata JSONB (flushed on next save).
		if l.sessions != nil && req != nil && req.SessionKey != "" {
			l.sessions.SetSessionMetadata(ctx, req.SessionKey, map[string]string{
				SessionMetaKeyLastCompactionAt: time.Now().UTC().Format(time.RFC3339),
			})
		}
		return compacted, nil
	}
}

// SessionMetaKeyLastCompactionAt is the sessions.metadata JSONB key used to
// record the RFC3339 timestamp of the most recent compaction. Exported so
// the web UI code path can read it back via GetSessionMetadata without
// duplicating the string.
const SessionMetaKeyLastCompactionAt = "last_compaction_at"

// cacheTouchAt returns the last prune-mutation timestamp for a session.
// Returns zero time if no touch recorded yet.
func (l *Loop) cacheTouchAt(sessionKey string) time.Time {
	if v, ok := l.cacheTouchBySession.Load(sessionKey); ok {
		return v.(time.Time)
	}
	return time.Time{}
}

// markCacheTouched records the current time as the last prune-mutation timestamp
// for the given session. Called only after pruning actually mutates messages.
func (l *Loop) markCacheTouched(sessionKey string) {
	l.cacheTouchBySession.Store(sessionKey, time.Now())
}

func (l *Loop) makeRunMemoryFlush() func(ctx context.Context, state *pipeline.RunState) error {
	return func(ctx context.Context, state *pipeline.RunState) error {
		settings := ResolveMemoryFlushSettings(l.compactionCfg)
		if settings == nil {
			return nil
		}
		l.runMemoryFlush(ctx, state.Input.SessionKey, settings)
		return nil
	}
}

func (l *Loop) makeFlushMessages(req *RunRequest) func(ctx context.Context, sessionKey string, msgs []providers.Message) error {
	// Track whether user message has been persisted (first flush only).
	// v2 adds user message to pendingMsgs explicitly; v3 keeps it in history
	// (via BuildMessages) so it never reaches FlushPending. This closure
	// persists the user message on first flush to match v2 session format.
	var userMsgFlushed bool
	return func(ctx context.Context, sessionKey string, msgs []providers.Message) error {
		if !userMsgFlushed && !req.HideInput && req.Message != "" {
			userMsgFlushed = true
			inputMessage := providers.Message{
				Role:    "user",
				Content: req.Message,
			}
			if req.hasEnrichedInputMessage {
				inputMessage = req.enrichedInputMessage
			}
			l.sessions.AddMessage(ctx, sessionKey, redactDelegationMessage(req, inputMessage))
		}
		for _, msg := range msgs {
			l.sessions.AddMessage(ctx, sessionKey, redactDelegationMessage(req, msg))
		}
		return nil
	}
}

func (l *Loop) makeUpdateMetadata(req *RunRequest) func(ctx context.Context, sessionKey string, usage, lastUsage providers.Usage, msgCount int) error {
	return func(ctx context.Context, sessionKey string, usage, lastUsage providers.Usage, msgCount int) error {
		l.sessions.UpdateMetadata(ctx, sessionKey, l.model, l.provider.Name(), req.Channel)
		l.sessions.AccumulateTokens(ctx, sessionKey, int64(usage.PromptTokens), int64(usage.CompletionTokens))
		// Persist session to DB (matching v2 finalizeRun behavior).
		// FlushMessages already ran, so all pending messages are in the cache.
		// Calibration uses the FINAL iteration's context size, NOT the
		// run-cumulative total — the total sums every think→act→observe
		// iteration and inflated the sessions "context used" display and
		// compaction decisions by the iteration count.
		// Current context = final prompt (incl. cached segments) + final output:
		// the last reply joins history, so it occupies the next request's prompt.
		// This matches msgCount, which already counts the flushed reply.
		if lastCtx := lastUsage.ContextTokens(); lastCtx > 0 {
			l.sessions.SetLastPromptTokens(ctx, sessionKey, lastCtx+lastUsage.CompletionTokens, msgCount)
		}
		l.sessions.Save(ctx, sessionKey)
		return nil
	}
}

func (l *Loop) makeSkillPostscript() func(ctx context.Context, content string, totalToolCalls int) string {
	if !l.skillEvolve || l.skillNudgeInterval <= 0 {
		return nil // disabled — FinalizeStage skips
	}
	var sent bool
	return func(ctx context.Context, content string, totalToolCalls int) string {
		if sent || totalToolCalls < l.skillNudgeInterval || IsSilentReply(content) {
			return content
		}
		sent = true
		locale := store.LocaleFromContext(ctx)
		return content + "\n\n---\n_" + i18n.T(locale, i18n.MsgSkillNudgePostscript) + "_"
	}
}

func (l *Loop) makeBootstrapCleanup() func(ctx context.Context, state *pipeline.RunState) error {
	return func(ctx context.Context, state *pipeline.RunState) error {
		if l.bootstrapCleanup == nil {
			return nil
		}
		return l.bootstrapCleanup(ctx, l.agentUUID, state.Input.UserID)
	}
}

func (l *Loop) reserveLLMUsage(ctx context.Context, req *RunRequest, state *pipeline.RunState, chatReq providers.ChatRequest, attempt string) (*usagecaps.Reservation, error) {
	providerName := ""
	if state.Provider != nil {
		providerName = state.Provider.Name()
	}
	// reserveLLMUsageFor runs the mandatory hard-ceiling guard before any
	// reservation or transport, so the non-fallback path is guarded here even
	// when usage caps are disabled (Lite runtime).
	return l.reserveLLMUsageFor(ctx, req, state.Iteration, chatReq, attempt, providerName, state.Model)
}

func (l *Loop) reserveLLMUsageFor(ctx context.Context, req *RunRequest, iteration int, chatReq providers.ChatRequest, attempt, providerName, model string) (*usagecaps.Reservation, error) {
	// Mandatory final hard-ceiling guard for the concrete request that is about
	// to be sent, after all directive/retry/reasoning mutations. This is the
	// shared pre-transport chokepoint for BOTH the fallback candidate path and
	// the non-fallback path (via reserveLLMUsage), and for every retry attempt.
	// It runs regardless of usage-cap configuration so the ceiling holds on Lite.
	if guardErr := l.guardCompleteModelRequest(chatReq, providerName, model, attempt); guardErr != nil {
		return nil, guardErr
	}
	if l.usageCaps == nil {
		return nil, nil
	}
	tenantID := store.TenantIDFromContext(ctx)
	if tenantID == uuid.Nil {
		tenantID = l.tenantID
	}
	key := fmt.Sprintf("%s:%s:%d:%s", req.RunID, l.agentUUID.String(), iteration+1, attempt)
	return l.usageCaps.Preflight(ctx, usagecaps.Request{
		TenantID:        tenantID,
		AgentID:         l.agentUUID,
		ProviderName:    providerName,
		ModelID:         model,
		ReservationKey:  key,
		Messages:        chatReq.Messages,
		MaxOutputTokens: l.maxOutputTokensFromRequest(chatReq),
	})
}

func supportsPromptCacheParams(provider providers.Provider) bool {
	switch provider.(type) {
	case *providers.CodexProvider, *providers.ChatGPTOAuthRouter:
		return true
	default:
		return false
	}
}

func setDefaultPromptCacheOptions(opts map[string]any, tenantID, agentID uuid.UUID, providerName, sessionKey string) {
	if opts == nil {
		return
	}
	if _, ok := opts[providers.OptPromptCacheKey]; !ok {
		opts[providers.OptPromptCacheKey] = defaultPromptCacheKey(tenantID, agentID, providerName, sessionKey)
	}
	if _, ok := opts[providers.OptPromptCacheRetention]; !ok {
		opts[providers.OptPromptCacheRetention] = "24h"
	}
}

func defaultPromptCacheKey(tenantID, agentID uuid.UUID, providerName, sessionKey string) string {
	h := sha256.Sum256([]byte(strings.Join([]string{
		tenantID.String(),
		agentID.String(),
		providerName,
		sessionKey,
	}, "\x00")))
	return "goclaw/" + hex.EncodeToString(h[:16])
}