package stage

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io/fs"
	"os"
	"path/filepath"
	"sort"
	"strings"
	"time"

	"gitea.maximumdirect.net/eric/narratio/internal/adapters/storage"
	"gitea.maximumdirect.net/eric/narratio/internal/artifactpolicy"
	"gitea.maximumdirect.net/eric/narratio/internal/artifacts"
	"gitea.maximumdirect.net/eric/narratio/internal/config"
	"gitea.maximumdirect.net/eric/narratio/internal/manifest"
)

type publishStage struct{}
type publishUploadFile struct {
	RelativePath string
	LocalPath    string
}

var publishPrerequisiteStages = []string{
	"prepare",
	"transcribe",
	"merge",
	"polish",
	"normalize",
	"trim",
	"analyze",
}

func (publishStage) Name() string { return "publish" }

func (publishStage) Declares() IODecl {
	return IODecl{
		Inputs: []artifacts.Ref{
			{Kind: "manifest", Category: "input", RelativePath: "manifest.json"},
		},
	}
}

func (publishStage) Run(ctx context.Context, env *Env, m *manifest.Manifest) (*StageResult, error) {
	if env == nil || env.Config == nil || env.Config.Pipeline == nil || env.Config.Session == nil {
		return nil, fmt.Errorf("publish: resolved config must include pipeline and session")
	}

	if publishDisabled(env) {
		return &StageResult{
			Metadata: map[string]any{
				"stage":                   "publish",
				"skipped":                 true,
				"publish_enabled":         false,
				"audio_upload_skipped":    true,
				"current_pointer_written": false,
			},
		}, nil
	}
	if publishRunUploadDisabled(env) {
		return &StageResult{
			Metadata: map[string]any{
				"stage":                   "publish",
				"skipped":                 true,
				"upload_run_enabled":      false,
				"audio_upload_skipped":    true,
				"current_pointer_written": false,
			},
		}, nil
	}

	if err := validatePublishPrerequisites(m); err != nil {
		return nil, fmt.Errorf("publish: %w", err)
	}
	if env.ObjectStore == nil {
		return nil, fmt.Errorf("publish: remote object store backend is required when publish run upload is enabled")
	}

	runRoot, err := resolvePublishRunRoot(env, m)
	if err != nil {
		return nil, fmt.Errorf("publish: resolve run root: %w", err)
	}
	runRootInfo, err := os.Stat(runRoot)
	if err != nil {
		return nil, fmt.Errorf("publish: run root %q: %w", runRoot, err)
	}
	if !runRootInfo.IsDir() {
		return nil, fmt.Errorf("publish: run root %q is not a directory", runRoot)
	}

	runPrefix, err := artifacts.ResolvePublishRunPrefix(env.Config, m)
	if err != nil {
		return nil, fmt.Errorf("publish: resolve s3 run prefix: %w", err)
	}
	sessionPrefix, err := artifacts.ResolvePublishSessionPrefix(env.Config, m)
	if err != nil {
		return nil, fmt.Errorf("publish: resolve s3 session prefix: %w", err)
	}
	bucket := artifacts.ResolvePublishBucket(env.Config, m)
	if bucket == "" {
		return nil, fmt.Errorf("publish: resolve s3 bucket: bucket is required")
	}
	runID := strings.TrimSpace(m.RunID)
	if runID == "" {
		return nil, fmt.Errorf("publish: run id is required")
	}

	manifestSource, err := resolvePublishRunManifestSource(runRoot)
	if err != nil {
		return nil, fmt.Errorf("publish: resolve run manifest source: %w", err)
	}

	runFiles, err := collectPublishRunFiles(runRoot, manifestSource)
	if err != nil {
		return nil, fmt.Errorf("publish: collect run files: %w", err)
	}
	sessionPaths := publishSessionPaths(env, m)
	previousFiles, err := collectPublishPreviousFiles(sessionPaths.PreviousDir)
	if err != nil {
		return nil, fmt.Errorf("publish: collect previous files: %w", err)
	}
	runtimeCatalog, err := buildPublishRuntimeArtifactCatalog(sessionPaths, env.Config.Pipeline.Scriptorium)
	if err != nil {
		return nil, fmt.Errorf("publish: build runtime artifact catalog: %w", err)
	}
	publishOutputs, skippedOptionalOutputs, skippedUnselectedOutputs, lockedOutputs, err := resolvePublishOutputs(
		sessionPaths,
		m,
		runtimeCatalog,
		env.Config.Pipeline.Publish.Outputs,
		env.Config.Pipeline.Publish.Locks,
		env.SelectedArtifactKeys,
		sessionPrefix,
	)
	if err != nil {
		return nil, fmt.Errorf("publish: resolve publish output rules: %w", err)
	}
	runUploaded := make([]string, 0, len(runFiles))
	for _, file := range runFiles {
		key := artifacts.S3RunRelativeDestinationKey(runPrefix, file.RelativePath)
		if _, err := env.ObjectStore.Upload(ctx, file.LocalPath, key, storage.UploadOptions{}); err != nil {
			return nil, fmt.Errorf("publish: upload run file %q to %q: %w", file.RelativePath, key, err)
		}
		runUploaded = append(runUploaded, file.RelativePath)
	}

	publishedUploaded := make([]string, 0, len(publishOutputs))
	for _, publishedOutput := range publishOutputs {
		key := artifacts.S3PublishedOutputKey(sessionPrefix, publishedOutput.Dest)
		if _, err := env.ObjectStore.Upload(ctx, publishedOutput.LocalPath, key, storage.UploadOptions{}); err != nil {
			return nil, fmt.Errorf("publish: upload published output source %q to %q: %w", publishedOutput.Source, key, err)
		}
		publishedUploaded = append(publishedUploaded, publishedOutput.Dest)
	}

	previousUploaded := make([]string, 0, len(previousFiles))
	for _, file := range previousFiles {
		key := artifacts.S3PublishedOutputKey(sessionPrefix, file.RelativePath)
		if _, err := env.ObjectStore.Upload(ctx, file.LocalPath, key, storage.UploadOptions{}); err != nil {
			return nil, fmt.Errorf("publish: upload previous file %q to %q: %w", file.RelativePath, key, err)
		}
		previousUploaded = append(previousUploaded, file.RelativePath)
	}

	currentManifestKey, currentRunPointerKey := artifacts.ResolveCurrentStateKeys(sessionPrefix)
	manifestTempPath, err := writeCurrentManifestSnapshot(m, publishMetadataPreview(
		bucket,
		runPrefix,
		sessionPrefix,
		runUploaded,
		publishedUploaded,
		previousUploaded,
		skippedOptionalOutputs,
		skippedUnselectedOutputs,
		lockedOutputs,
		currentManifestKey,
	))
	if err != nil {
		return nil, fmt.Errorf("publish: build current manifest snapshot: %w", err)
	}
	defer func() { _ = os.Remove(manifestTempPath) }()

	if _, err := env.ObjectStore.Upload(ctx, manifestTempPath, currentManifestKey, storage.UploadOptions{
		ContentType: "application/json",
	}); err != nil {
		return nil, fmt.Errorf("publish: upload current manifest to %q: %w", currentManifestKey, err)
	}

	runIDTempPath, err := writeCurrentRunIDPointer(runID)
	if err != nil {
		return nil, fmt.Errorf("publish: build current run id pointer: %w", err)
	}
	defer func() { _ = os.Remove(runIDTempPath) }()

	if _, err := env.ObjectStore.Upload(ctx, runIDTempPath, currentRunPointerKey, storage.UploadOptions{
		ContentType: "text/plain; charset=utf-8",
	}); err != nil {
		return nil, fmt.Errorf("publish: upload current run pointer to %q: %w", currentRunPointerKey, err)
	}

	return &StageResult{
		Metadata: map[string]any{
			"stage":                      "publish",
			"uploaded":                   true,
			"s3_bucket":                  bucket,
			"s3_run_prefix":              runPrefix,
			"run_files_uploaded":         len(runUploaded),
			"run_uploaded_paths":         runUploaded,
			"published_files_uploaded":   len(publishedUploaded),
			"published_paths":            publishedUploaded,
			"previous_files_uploaded":    len(previousUploaded),
			"previous_uploaded_paths":    previousUploaded,
			"skipped_optional_outputs":   skippedOptionalOutputs,
			"skipped_unselected_outputs": skippedUnselectedOutputMetadata(skippedUnselectedOutputs),
			"locked_output_count":        len(lockedOutputs),
			"locked_outputs":             lockedOutputMetadata(lockedOutputs),
			"current_manifest_key":       currentManifestKey,
			"current_run_id_key":         currentRunPointerKey,
			"current_pointer_written":    true,
			"audio_upload_skipped":       true,
		},
	}, nil
}

type publishOutput struct {
	Source     string
	Dest       string
	Required   bool
	LocalPath  string
	Provenance string
}

type publishLockedOutput struct {
	Source     string
	Dest       string
	RemoteKey  string
	Reason     string
	Required   bool
	LocalPath  string
	Provenance string
}

type publishSkippedUnselectedOutput struct {
	Source   string
	Dest     string
	Required bool
}

func publishDisabled(env *Env) bool {
	cfg := env.Config.Pipeline.Publish
	if cfg == nil {
		return true
	}
	return cfg.Enabled != nil && !*cfg.Enabled
}

func publishRunUploadDisabled(env *Env) bool {
	cfg := env.Config.Pipeline.Publish
	if cfg == nil {
		return true
	}
	return cfg.UploadRun != nil && !*cfg.UploadRun
}

func validatePublishPrerequisites(m *manifest.Manifest) error {
	if m == nil {
		return fmt.Errorf("manifest is required")
	}
	for _, stageName := range publishPrerequisiteStages {
		sr := m.Stages[stageName]
		if sr == nil {
			return fmt.Errorf("prerequisite stage %q has not succeeded", stageName)
		}
		if sr.Status != manifest.StatusSucceeded {
			return fmt.Errorf("prerequisite stage %q status is %q (want %q)", stageName, sr.Status, manifest.StatusSucceeded)
		}
	}
	return nil
}

func resolvePublishRunRoot(env *Env, m *manifest.Manifest) (string, error) {
	sessionID := strings.TrimSpace(env.Config.Session.SessionID)
	if sessionID == "" && m != nil {
		sessionID = strings.TrimSpace(m.SessionID)
	}
	campaign := strings.TrimSpace(env.Config.Session.Campaign)
	if campaign == "" && m != nil {
		campaign = strings.TrimSpace(m.Campaign)
	}
	runID := ""
	if m != nil {
		runID = strings.TrimSpace(m.RunID)
	}
	if sessionID == "" || campaign == "" {
		return "", fmt.Errorf("campaign and session id are required")
	}
	if runID == "" {
		return "", fmt.Errorf("run id is required")
	}

	canonical := filepath.Clean(artifacts.SessionRunRootForCampaign(env.Config.Pipeline.Workspace.Root, campaign, sessionID, runID))
	canonicalExists, err := directoryExists(canonical)
	if err != nil {
		return "", fmt.Errorf("check canonical run root %q: %w", canonical, err)
	}
	if !canonicalExists {
		return "", fmt.Errorf("run root not found for campaign %q session %q run %q at canonical path %q", campaign, sessionID, runID, canonical)
	}
	return canonical, nil
}

func resolvePublishSessionRoot(env *Env, m *manifest.Manifest) (string, error) {
	sessionID := strings.TrimSpace(env.Config.Session.SessionID)
	if sessionID == "" && m != nil {
		sessionID = strings.TrimSpace(m.SessionID)
	}
	campaign := strings.TrimSpace(env.Config.Session.Campaign)
	if campaign == "" && m != nil {
		campaign = strings.TrimSpace(m.Campaign)
	}
	if sessionID == "" {
		return "", fmt.Errorf("session id is required")
	}
	if campaign == "" {
		return "", fmt.Errorf("campaign is required")
	}
	return filepath.Clean(artifacts.SessionWorkDirForCampaign(env.Config.Pipeline.Workspace.Root, campaign, sessionID)), nil
}

func publishSessionPaths(env *Env, m *manifest.Manifest) artifacts.SessionPaths {
	sessionID := strings.TrimSpace(env.Config.Session.SessionID)
	if sessionID == "" && m != nil {
		sessionID = strings.TrimSpace(m.SessionID)
	}
	campaign := strings.TrimSpace(env.Config.Session.Campaign)
	if campaign == "" && m != nil {
		campaign = strings.TrimSpace(m.Campaign)
	}
	store := artifacts.NewLocalStore(env.Config.Pipeline.Workspace.Root)
	return store.SessionPathsFor(campaign, sessionID)
}

func resolvePublishOutputs(
	paths artifacts.SessionPaths,
	m *manifest.Manifest,
	catalog *artifacts.ArtifactCatalog,
	rules []config.PublishOutputRule,
	locks []config.PublishLockRule,
	selectedArtifactKeys []string,
	sessionPrefix string,
) ([]publishOutput, []string, []publishSkippedUnselectedOutput, []publishLockedOutput, error) {
	out := make([]publishOutput, 0, len(rules))
	skippedOptionalOutputs := make([]string, 0)
	skippedUnselectedOutputs := make([]publishSkippedUnselectedOutput, 0)
	lockedOutputs := make([]publishLockedOutput, 0)
	lockSet := publishLockSet(locks)
	selectedSet := publishSelectedArtifactSet(selectedArtifactKeys)
	configuredOutputs := configuredOutputPathMapFromCatalog(catalog)
	for _, rule := range rules {
		source := strings.TrimSpace(rule.Source)
		required := rule.Required == nil || *rule.Required
		dest, err := resolvePublishOutputDest(rule, configuredOutputs)
		if err != nil {
			return nil, nil, nil, nil, fmt.Errorf("source %q: %w", source, err)
		}
		if len(selectedSet) > 0 {
			if key, ok := artifactpolicy.ParseConfiguredSource(source); ok {
				if _, selected := selectedSet[key]; !selected {
					skippedUnselectedOutputs = append(skippedUnselectedOutputs, publishSkippedUnselectedOutput{
						Source:   source,
						Dest:     dest,
						Required: required,
					})
					continue
				}
			}
		}
		lock, locked := lockSet[source]
		resolved, err := artifacts.ResolveSessionArtifactWithCatalog(paths, m, source, catalog)
		if err != nil {
			if locked {
				lockedOutputs = append(lockedOutputs, publishLockedOutput{
					Source:    source,
					Dest:      dest,
					RemoteKey: artifacts.S3PublishedOutputKey(sessionPrefix, dest),
					Reason:    strings.TrimSpace(lock.Reason),
					Required:  required,
				})
				continue
			}
			if errors.Is(err, artifacts.ErrSessionArtifactNotFound) && !required {
				skippedOptionalOutputs = append(skippedOptionalOutputs, dest)
				continue
			}
			if errors.Is(err, artifacts.ErrSessionArtifactNotFound) {
				return nil, nil, nil, nil, fmt.Errorf("required output source unavailable: %q", source)
			}
			return nil, nil, nil, nil, fmt.Errorf("resolve source %q: %w", source, err)
		}
		if locked {
			lockedOutputs = append(lockedOutputs, publishLockedOutput{
				Source:     source,
				Dest:       dest,
				RemoteKey:  artifacts.S3PublishedOutputKey(sessionPrefix, dest),
				Reason:     strings.TrimSpace(lock.Reason),
				Required:   required,
				LocalPath:  resolved.Path,
				Provenance: resolved.Provenance,
			})
			continue
		}
		out = append(out, publishOutput{
			Source:     source,
			Dest:       dest,
			Required:   required,
			LocalPath:  resolved.Path,
			Provenance: resolved.Provenance,
		})
	}
	return out, skippedOptionalOutputs, skippedUnselectedOutputs, lockedOutputs, nil
}

func publishSelectedArtifactSet(selected []string) map[string]struct{} {
	if len(selected) == 0 {
		return nil
	}
	out := make(map[string]struct{}, len(selected))
	for _, key := range selected {
		trimmed := strings.TrimSpace(key)
		if trimmed == "" {
			continue
		}
		out[trimmed] = struct{}{}
	}
	return out
}

func publishLockSet(locks []config.PublishLockRule) map[string]config.PublishLockRule {
	out := make(map[string]config.PublishLockRule, len(locks))
	for _, lock := range locks {
		source := strings.TrimSpace(lock.Source)
		if source == "" {
			continue
		}
		lock.Source = source
		lock.Reason = strings.TrimSpace(lock.Reason)
		out[source] = lock
	}
	return out
}

func resolvePublishOutputDest(rule config.PublishOutputRule, configured map[string]string) (string, error) {
	return artifactpolicy.ResolvePublishedDestination(rule.Source, rule.Dest, configured)
}

func configuredOutputPathMapFromCatalog(catalog *artifacts.ArtifactCatalog) map[string]string {
	out := map[string]string{}
	if catalog == nil {
		return out
	}
	for _, entry := range catalog.ListConfigured() {
		if strings.TrimSpace(entry.ConfiguredKey) == "" {
			continue
		}
		out[entry.ConfiguredKey] = strings.TrimSpace(entry.CanonicalRelPath)
	}
	return out
}

func buildPublishRuntimeArtifactCatalog(
	paths artifacts.SessionPaths,
	scriptoriumCfg *config.ScriptoriumConfig,
) (*artifacts.ArtifactCatalog, error) {
	catalog := artifacts.NewArtifactCatalog()
	if err := catalog.RegisterBuiltIns(); err != nil {
		return nil, err
	}
	if scriptoriumCfg == nil {
		return catalog, nil
	}

	configured := map[string]artifacts.ConfiguredArtifactDefinition{}
	for key, artifactCfg := range scriptoriumCfg.Artifacts {
		configured[key] = artifacts.ConfiguredArtifactDefinition{
			Enabled:    artifactCfg.Enabled,
			OutputPath: artifactCfg.OutputPath,
		}
	}
	if err := catalog.RegisterConfiguredArtifacts(configured, nil); err != nil {
		return nil, err
	}

	for _, entry := range catalog.ListConfigured() {
		if strings.TrimSpace(entry.CanonicalRelPath) == "" {
			continue
		}
		localPath, err := resolveConfiguredArtifactLocalPath(paths, entry.CanonicalRelPath)
		if err != nil {
			continue
		}
		info, statErr := os.Stat(localPath)
		if statErr != nil {
			if os.IsNotExist(statErr) {
				continue
			}
			return nil, fmt.Errorf("stat configured artifact %q: %w", entry.SourceID, statErr)
		}
		if info.IsDir() {
			continue
		}
		if err := catalog.MarkAvailableFromDisk(entry.SourceID, localPath); err != nil {
			return nil, err
		}
	}

	return catalog, nil
}

func resolveConfiguredArtifactLocalPath(paths artifacts.SessionPaths, configured string) (string, error) {
	outputPath := strings.TrimSpace(configured)
	if outputPath == "" {
		return "", fmt.Errorf("configured artifact output path is required")
	}
	if filepath.IsAbs(outputPath) {
		return filepath.Clean(outputPath), nil
	}
	rel := filepath.Clean(outputPath)
	if rel == "." || rel == "" {
		return "", fmt.Errorf("relative output path is required")
	}
	if rel == ".." || strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
		return "", fmt.Errorf("relative output path escapes session root: %q", configured)
	}
	return filepath.Join(paths.Root, rel), nil
}

func collectPublishRunFiles(runRoot, manifestPath string) ([]publishUploadFile, error) {
	files := make([]publishUploadFile, 0, 64)
	err := filepath.WalkDir(runRoot, func(path string, d fs.DirEntry, walkErr error) error {
		if walkErr != nil {
			return walkErr
		}
		if d.IsDir() {
			if path == runRoot {
				return nil
			}
			relDir, err := filepath.Rel(runRoot, path)
			if err != nil {
				return fmt.Errorf("relative dir from %q to %q: %w", runRoot, path, err)
			}
			relDir = filepath.ToSlash(relDir)
			// Preserve existing behavior: audio is not uploaded in publish run record.
			if relDir == "audio" || strings.HasPrefix(relDir, "audio/") {
				return filepath.SkipDir
			}
			return nil
		}
		rel, err := filepath.Rel(runRoot, path)
		if err != nil {
			return fmt.Errorf("relative path from %q to %q: %w", runRoot, path, err)
		}
		rel = filepath.ToSlash(rel)
		files = append(files, publishUploadFile{
			RelativePath: rel,
			LocalPath:    path,
		})
		return nil
	})
	if err != nil {
		return nil, fmt.Errorf("walk %q: %w", runRoot, err)
	}

	manifestInfo, err := os.Stat(manifestPath)
	if err != nil {
		if os.IsNotExist(err) {
			return nil, fmt.Errorf("manifest.json not found (checked path %q)", manifestPath)
		}
		return nil, fmt.Errorf("stat %q: %w", manifestPath, err)
	}
	if manifestInfo.IsDir() {
		return nil, fmt.Errorf("manifest path %q is a directory", manifestPath)
	}
	files = append(files, publishUploadFile{
		RelativePath: "manifest.json",
		LocalPath:    manifestPath,
	})
	seen := map[string]publishUploadFile{}
	for _, file := range files {
		seen[file.RelativePath] = file
	}
	files = files[:0]
	for _, file := range seen {
		files = append(files, file)
	}

	sort.Slice(files, func(i, j int) bool {
		return files[i].RelativePath < files[j].RelativePath
	})
	return files, nil
}

func collectPublishPreviousFiles(previousDir string) ([]publishUploadFile, error) {
	previousDir = filepath.Clean(strings.TrimSpace(previousDir))
	if previousDir == "" {
		return nil, fmt.Errorf("previous directory is required")
	}
	info, err := os.Stat(previousDir)
	if err != nil {
		if os.IsNotExist(err) {
			return nil, nil
		}
		return nil, fmt.Errorf("stat %q: %w", previousDir, err)
	}
	if !info.IsDir() {
		return nil, fmt.Errorf("previous path %q is not a directory", previousDir)
	}

	files := make([]publishUploadFile, 0, 16)
	err = filepath.WalkDir(previousDir, func(path string, d fs.DirEntry, walkErr error) error {
		if walkErr != nil {
			return walkErr
		}
		if d.IsDir() {
			return nil
		}
		rel, err := filepath.Rel(previousDir, path)
		if err != nil {
			return fmt.Errorf("relative path from %q to %q: %w", previousDir, path, err)
		}
		rel = filepath.ToSlash(rel)
		files = append(files, publishUploadFile{
			RelativePath: filepath.ToSlash(filepath.Join(config.PathPreviousDirSegment, rel)),
			LocalPath:    path,
		})
		return nil
	})
	if err != nil {
		return nil, fmt.Errorf("walk %q: %w", previousDir, err)
	}

	sort.Slice(files, func(i, j int) bool {
		return files[i].RelativePath < files[j].RelativePath
	})
	return files, nil
}

func resolvePublishRunManifestSource(runRoot string) (string, error) {
	path := filepath.Join(filepath.Clean(runRoot), "manifest.json")
	info, err := os.Stat(path)
	if err != nil {
		if os.IsNotExist(err) {
			return "", fmt.Errorf("manifest.json not found in run root %q", runRoot)
		}
		return "", fmt.Errorf("stat %q: %w", path, err)
	}
	if info.IsDir() {
		return "", fmt.Errorf("manifest path %q is a directory", path)
	}
	return path, nil
}

func directoryExists(path string) (bool, error) {
	info, err := os.Stat(path)
	if err == nil {
		return info.IsDir(), nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}

func writeCurrentManifestSnapshot(m *manifest.Manifest, publishMetadata map[string]any) (string, error) {
	if m == nil {
		return "", fmt.Errorf("manifest is required")
	}
	clone := *m
	clone.Stages = make(map[string]*manifest.StageRecord, len(m.Stages))
	for name, sr := range m.Stages {
		if sr == nil {
			continue
		}
		stageCopy := *sr
		if sr.Outputs != nil {
			stageCopy.Outputs = append([]manifest.ArtifactRecord(nil), sr.Outputs...)
		}
		if sr.Logs != nil {
			stageCopy.Logs = append([]string(nil), sr.Logs...)
		}
		if sr.GeneratedConfigs != nil {
			stageCopy.GeneratedConfigs = append([]string(nil), sr.GeneratedConfigs...)
		}
		if sr.Metadata != nil {
			metaCopy := make(map[string]any, len(sr.Metadata))
			for k, v := range sr.Metadata {
				metaCopy[k] = v
			}
			stageCopy.Metadata = metaCopy
		}
		clone.Stages[name] = &stageCopy
	}

	now := time.Now().UTC()
	clone.MarkStageSucceeded("publish", now, nil)
	if sr := clone.Stages["publish"]; sr != nil {
		sr.Metadata = publishMetadata
	}

	data, err := json.MarshalIndent(&clone, "", "  ")
	if err != nil {
		return "", fmt.Errorf("marshal manifest: %w", err)
	}
	data = append(data, '\n')

	tmp, err := os.CreateTemp("", "narratio-current-manifest-*.json")
	if err != nil {
		return "", fmt.Errorf("create temp file: %w", err)
	}
	path := tmp.Name()
	if _, err := tmp.Write(data); err != nil {
		_ = tmp.Close()
		return "", fmt.Errorf("write temp manifest: %w", err)
	}
	if err := tmp.Close(); err != nil {
		return "", fmt.Errorf("close temp manifest: %w", err)
	}
	return path, nil
}

func writeCurrentRunIDPointer(runID string) (string, error) {
	tmp, err := os.CreateTemp("", "narratio-current-run-id-*.txt")
	if err != nil {
		return "", fmt.Errorf("create temp file: %w", err)
	}
	path := tmp.Name()
	if _, err := tmp.WriteString(runID + "\n"); err != nil {
		_ = tmp.Close()
		return "", fmt.Errorf("write temp run id pointer: %w", err)
	}
	if err := tmp.Close(); err != nil {
		return "", fmt.Errorf("close temp run id pointer: %w", err)
	}
	return path, nil
}

func publishMetadataPreview(
	bucket, runPrefix, sessionPrefix string,
	runUploaded []string,
	publishedUploaded []string,
	previousUploaded []string,
	skippedOptionalOutputs []string,
	skippedUnselectedOutputs []publishSkippedUnselectedOutput,
	lockedOutputs []publishLockedOutput,
	currentManifestKey string,
) map[string]any {
	return map[string]any{
		"stage":                      "publish",
		"uploaded":                   true,
		"s3_bucket":                  bucket,
		"s3_run_prefix":              runPrefix,
		"run_files_uploaded":         len(runUploaded),
		"run_uploaded_paths":         append([]string(nil), runUploaded...),
		"published_files_uploaded":   len(publishedUploaded),
		"published_paths":            append([]string(nil), publishedUploaded...),
		"previous_files_uploaded":    len(previousUploaded),
		"previous_uploaded_paths":    append([]string(nil), previousUploaded...),
		"skipped_optional_outputs":   append([]string(nil), skippedOptionalOutputs...),
		"skipped_unselected_outputs": skippedUnselectedOutputMetadata(skippedUnselectedOutputs),
		"locked_output_count":        len(lockedOutputs),
		"locked_outputs":             lockedOutputMetadata(lockedOutputs),
		"current_manifest_key":       currentManifestKey,
		"current_run_id_key":         artifacts.S3CurrentRunPointerKey(sessionPrefix),
		"current_pointer_written":    false,
		"audio_upload_skipped":       true,
	}
}

func skippedUnselectedOutputMetadata(skipped []publishSkippedUnselectedOutput) []map[string]any {
	out := make([]map[string]any, 0, len(skipped))
	for _, item := range skipped {
		out = append(out, map[string]any{
			"source":   item.Source,
			"dest":     item.Dest,
			"required": item.Required,
		})
	}
	return out
}

func lockedOutputMetadata(locked []publishLockedOutput) []map[string]any {
	out := make([]map[string]any, 0, len(locked))
	for _, item := range locked {
		out = append(out, map[string]any{
			"source":     item.Source,
			"dest":       item.Dest,
			"remote_key": item.RemoteKey,
			"reason":     item.Reason,
			"required":   item.Required,
			"local_path": item.LocalPath,
			"provenance": item.Provenance,
		})
	}
	return out
}