nsfwapp/backend/recorder.go

// backend/recorder.go
package main

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"math"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"github.com/google/uuid"
)

// ---------------- Progress mapping ----------------

func setJobProgress(job *RecordJob, phase string, pct int) {
	phase = strings.TrimSpace(phase)
	phaseLower := strings.ToLower(phase)

	if pct < 0 {
		pct = 0
	}
	if pct > 100 {
		pct = 100
	}

	type rng struct{ start, end int }

	rangeFor := func(ph string) rng {
		switch ph {
		case "postwork":
			return rng{0, 8}
		case "remuxing":
			return rng{8, 38}
		case "moving":
			return rng{38, 54}
		case "probe":
			return rng{54, 70}
		case "assets":
			return rng{70, 88}
		case "analyze":
			return rng{88, 99}
		default:
			return rng{0, 100}
		}
	}

	jobsMu.Lock()
	defer jobsMu.Unlock()

	oldPhase := job.Phase
	oldProgress := job.Progress

	inPostwork := job.EndedAt != nil || (strings.TrimSpace(job.Phase) != "" && strings.ToLower(strings.TrimSpace(job.Phase)) != "recording")
	if inPostwork {
		if phaseLower == "" || phaseLower == "recording" {
			return
		}
	}

	newPhase := job.Phase
	if phase != "" {
		newPhase = phase
	}

	newProgress := job.Progress

	if !inPostwork {
		if pct < newProgress {
			pct = newProgress
		}
		newProgress = pct
	} else {
		r := rangeFor(phaseLower)
		width := float64(r.end - r.start)

		mapped := r.start
		if width > 0 {
			mapped = r.start + int(math.Round((float64(pct)/100.0)*width))
		}

		if mapped < r.start {
			mapped = r.start
		}
		if mapped > r.end {
			mapped = r.end
		}
		if mapped < newProgress {
			mapped = newProgress
		}
		newProgress = mapped
	}

	if oldPhase == newPhase && oldProgress == newProgress {
		return
	}

	job.Phase = newPhase
	job.Progress = newProgress
}

// ---------------- Preview scrubber ----------------

const defaultScrubberCount = 18

// /api/preview-scrubber/{index}?id=...   (oder ?file=...)
func recordPreviewScrubberFrame(w http.ResponseWriter, r *http.Request) {
	const prefix = "/api/preview-scrubber/"
	if !strings.HasPrefix(r.URL.Path, prefix) {
		http.NotFound(w, r)
		return
	}

	idxPart := strings.Trim(strings.TrimPrefix(r.URL.Path, prefix), "/")
	if idxPart == "" {
		http.Error(w, "missing scrubber frame index", http.StatusBadRequest)
		return
	}

	idx, err := strconv.Atoi(idxPart)
	if err != nil || idx < 0 {
		http.Error(w, "invalid scrubber frame index", http.StatusBadRequest)
		return
	}

	q := r.URL.Query()
	id := strings.TrimSpace(q.Get("id"))
	file := strings.TrimSpace(q.Get("file"))
	if id == "" && file == "" {
		http.Error(w, "missing id or file", http.StatusBadRequest)
		return
	}

	durSec, err := lookupDurationForScrubber(r)
	if err != nil || durSec <= 0 {
		durSec = 60
	}

	count := defaultScrubberCount
	if idx >= count {
		idx = count - 1
	}
	if count < 1 {
		count = 1
	}

	t := scrubberIndexToTime(idx, count, durSec)

	targetQ := url.Values{}
	if id != "" {
		targetQ.Set("id", id)
	}
	if file != "" {
		targetQ.Set("file", file)
	}
	targetQ.Set("t", fmt.Sprintf("%.3f", t))

	w.Header().Set("Cache-Control", "private, max-age=300")
	http.Redirect(w, r, "/api/preview?"+targetQ.Encode(), http.StatusFound)
}

// Gleichmäßig über die Videolänge sampeln (Mitte des Segments)
func scrubberIndexToTime(index, count int, durationSec float64) float64 {
	if count <= 1 {
		return 0.1
	}
	if durationSec <= 0 {
		return 0.1
	}

	maxT := math.Max(0.1, durationSec-0.1)
	ratio := (float64(index) + 0.5) / float64(count)
	t := ratio * maxT

	if t < 0.1 {
		t = 0.1
	}
	if t > maxT {
		t = maxT
	}
	return t
}

func lookupDurationForScrubber(r *http.Request) (float64, error) {
	path, ok, _, _ := resolvePlayablePathFromQuery(r)
	if !ok || strings.TrimSpace(path) == "" {
		return 0, appErrorf("unable to resolve file")
	}

	// best-effort meta
	ensureMetaJSONForPlayback(r.Context(), path)

	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
	defer cancel()
	sec, err := durationSecondsCached(ctx, path)
	if err != nil {
		return 0, err
	}
	return sec, nil
}

// ---------------- Preview sprite file handler ----------------

func recordPreviewSprite(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet && r.Method != http.MethodHead {
		http.Error(w, "Nur GET/HEAD", http.StatusMethodNotAllowed)
		return
	}

	id := strings.TrimPrefix(r.URL.Path, "/api/record/preview-sprite/")
	if id == r.URL.Path {
		id = strings.TrimPrefix(r.URL.Path, "/api/preview-sprite/")
	}
	id = strings.TrimSpace(id)
	id = strings.Trim(id, "/")

	if id == "" {
		http.Error(w, "id fehlt", http.StatusBadRequest)
		return
	}

	var err error
	id, err = sanitizeID(id)
	if err != nil {
		http.Error(w, "ungültige id", http.StatusBadRequest)
		return
	}

	dir, err := generatedDirForID(id)
	if err != nil {
		http.Error(w, "ungültige id", http.StatusBadRequest)
		return
	}

	spritePath := filepath.Join(dir, "preview-sprite.jpg")

	fi, err := os.Stat(spritePath)
	if err != nil || fi.IsDir() || fi.Size() <= 0 {
		http.NotFound(w, r)
		return
	}

	f, err := os.Open(spritePath)
	if err != nil {
		http.NotFound(w, r)
		return
	}
	defer f.Close()

	w.Header().Set("Content-Type", "image/jpeg")
	w.Header().Set("Cache-Control", "private, max-age=31536000, immutable")
	w.Header().Set("X-Content-Type-Options", "nosniff")

	http.ServeContent(w, r, "preview-sprite.jpg", fi.ModTime(), f)
}

// ---------------- Start + run job ----------------

func markModelPublicWhileRecording(job *RecordJob) {
	if job == nil {
		return
	}

	rawURL := strings.TrimSpace(job.SourceURL)
	if rawURL == "" {
		return
	}

	if detectProvider(rawURL) != "chaturbate" {
		return
	}

	modelKey := strings.TrimSpace(extractUsername(rawURL))
	if modelKey == "" {
		return
	}

	store := getModelStore()
	if store == nil {
		return
	}

	now := time.Now().UTC()

	_ = store.SetChaturbateRoomState(
		"chaturbate.com",
		modelKey,
		"public",
		true,
		rawURL,
		"",
		now,
	)
}

func safeFileSize(path string) int64 {
	path = strings.TrimSpace(path)
	if path == "" {
		return 0
	}

	fi, err := os.Stat(path)
	if err != nil || fi == nil || fi.IsDir() {
		return 0
	}
	return fi.Size()
}

func statOutputForLog(path string) string {
	path = strings.TrimSpace(path)
	if path == "" {
		return "path-empty"
	}

	fi, err := os.Stat(path)
	if err != nil {
		return "stat-error=" + err.Error()
	}
	if fi == nil {
		return "stat-nil"
	}
	if fi.IsDir() {
		return "is-dir"
	}

	return fmt.Sprintf("exists size=%d mod=%s", fi.Size(), fi.ModTime().Format(time.RFC3339Nano))
}

func waitForUsableOutput(path string, timeout time.Duration) (os.FileInfo, error) {
	path = strings.TrimSpace(path)
	if path == "" {
		return nil, appErrorf("path empty")
	}

	deadline := time.Now().Add(timeout)
	var lastErr error

	for {
		fi, err := os.Stat(path)
		if err == nil && fi != nil && !fi.IsDir() && fi.Size() > 0 {
			return fi, nil
		}

		if err != nil {
			lastErr = err
		} else if fi == nil {
			lastErr = appErrorf("stat returned nil")
		} else if fi.IsDir() {
			lastErr = appErrorf("path is dir")
		} else {
			lastErr = appErrorf("file size is 0")
		}

		if time.Now().After(deadline) {
			break
		}
		time.Sleep(150 * time.Millisecond)
	}

	if lastErr == nil {
		lastErr = appErrorf("usable output not ready in time")
	}
	return nil, lastErr
}

func shouldKeepStoppedJobForInspection(target JobStatus, out string) bool {
	if target != JobStopped {
		return false
	}

	fi, err := os.Stat(strings.TrimSpace(out))
	if err != nil || fi == nil || fi.IsDir() {
		return false
	}

	// auch kleine Fragmente sichtbar behalten, damit du sie debuggen kannst
	return fi.Size() > 0
}

func isActiveRecordingJob(job *RecordJob) bool {
	if job == nil {
		return false
	}
	if job.EndedAt != nil {
		return false
	}
	if job.Status != JobRunning {
		return false
	}

	phase := strings.ToLower(strings.TrimSpace(job.Phase))
	return phase == "" || phase == "recording"
}

func activeRecordingJobsCount() int {
	jobsMu.RLock()
	defer jobsMu.RUnlock()

	n := 0
	for _, j := range jobs {
		if isActiveRecordingJob(j) {
			n++
		}
	}
	return n
}

func concurrentDownloadsLimitState() (enabled bool, max int, active int, reached bool) {
	s := getSettings()

	enabled = s.EnableConcurrentDownloadsLimit
	max = s.MaxConcurrentDownloads
	if max < 1 {
		max = 1
	}

	active = activeRecordingJobsCount()
	reached = enabled && active >= max
	return
}

type downloadLimitReachedError struct {
	Active int
	Max    int
}

func (e downloadLimitReachedError) Error() string {
	return fmt.Sprintf("Download-Limit erreicht (%d/%d aktiv)", e.Active, e.Max)
}

func isDownloadLimitReachedError(err error) bool {
	var e downloadLimitReachedError
	return errors.As(err, &e)
}

var lastDownloadLimitLogAt time.Time

func logDownloadLimitReachedThrottled(err error) {
	if err == nil {
		return
	}

	if !isDownloadLimitReachedError(err) {
		appLogln("❌", err)
		return
	}

	now := time.Now()

	// Nur alle 60 Sekunden ins Log schreiben.
	if !lastDownloadLimitLogAt.IsZero() && now.Sub(lastDownloadLimitLogAt) < 60*time.Second {
		return
	}

	lastDownloadLimitLogAt = now
	appLogln("❌", err)
}

func startRecordingInternal(req RecordRequest) (*RecordJob, error) {
	url := strings.TrimSpace(req.URL)
	if url == "" {
		return nil, errors.New("url fehlt")
	}

	provider := detectProvider(url)
	if provider != "chaturbate" && provider != "mfc" {
		return nil, appErrorf("unsupported provider: %q", url)
	}

	if err := ensureDiskGuardAllowsStart(); err != nil {
		return nil, err
	}

	jobsMu.Lock()
	defer jobsMu.Unlock()

	// Duplicate-Check
	for _, j := range jobs {
		if j != nil && j.Status == JobRunning && j.EndedAt == nil && strings.TrimSpace(j.SourceURL) == url {
			if j.Hidden && !req.Hidden {
				j.Hidden = false
				return j, nil
			}
			return j, nil
		}
	}

	// Limit-Check ATOMAR unter jobsMu
	s := getSettings()
	if s.EnableConcurrentDownloadsLimit && !req.IgnoreConcurrentLimit {
		max := s.MaxConcurrentDownloads
		if max < 1 {
			max = 1
		}

		active := 0
		for _, j := range jobs {
			if isActiveRecordingJob(j) {
				active++
			}
		}

		if active >= max {
			return nil, downloadLimitReachedError{
				Active: active,
				Max:    max,
			}
		}
	}

	startedAt := time.Now()

	username := ""
	switch provider {
	case "chaturbate":
		username = extractUsername(url)
	case "mfc":
		username = extractMFCUsername(url)
	}
	if strings.TrimSpace(username) == "" {
		username = "unknown"
	}

	// ✅ Erst in TS aufnehmen
	filename := fmt.Sprintf("%s_%s.ts", username, startedAt.Format("01_02_2006__15-04-05"))

	recordDirAbs, _ := resolvePathRelativeToApp(s.RecordDir)
	recordDir := strings.TrimSpace(recordDirAbs)
	if recordDir == "" {
		recordDir = strings.TrimSpace(s.RecordDir)
	}
	outPath := filepath.Join(recordDir, filename)

	jobID := uuid.NewString()
	ctx, cancel := context.WithCancel(context.Background())

	job := &RecordJob{
		ID:          jobID,
		SourceURL:   url,
		Status:      JobRunning,
		StartedAt:   startedAt,
		StartedAtMs: startedAt.UnixMilli(),
		Output:      outPath,
		Hidden:      req.Hidden,
		cancel:      cancel,
	}

	jobs[jobID] = job
	go runJob(ctx, job, req)

	return job, nil
}

func requireNonEmptyRegularFile(path string, label string) error {
	path = strings.TrimSpace(path)
	if path == "" {
		return appErrorf("%s: path empty", label)
	}

	fi, err := os.Stat(path)
	if err != nil {
		return appErrorf("%s: %w", label, err)
	}
	if fi == nil || fi.IsDir() {
		return appErrorf("%s: not a file", label)
	}
	if fi.Size() <= 0 {
		return appErrorf("%s: empty file", label)
	}
	return nil
}

func buildPostworkTempMP4Path(tsPath string) (string, error) {
	s := getSettings()

	doneAbs, err := resolvePathRelativeToApp(s.DoneDir)
	if err != nil {
		return "", appErrorf("doneDir auflösung fehlgeschlagen: %w", err)
	}
	doneAbs = strings.TrimSpace(doneAbs)
	if doneAbs == "" {
		return "", appErrorf("doneDir ist leer")
	}

	tmpDir := filepath.Join(doneAbs, ".postwork_tmp")
	if err := os.MkdirAll(tmpDir, 0o755); err != nil {
		return "", appErrorf("postwork tmp dir erstellen fehlgeschlagen: %w", err)
	}

	base := strings.TrimSuffix(filepath.Base(strings.TrimSpace(tsPath)), filepath.Ext(tsPath)) + ".mp4"
	return uniqueDestPath(tmpDir, base)
}

func moveRepairSourceTSBestEffort(tsPath string, finalMP4Path string) string {
	tsPath = strings.TrimSpace(tsPath)
	if tsPath == "" {
		return ""
	}

	if err := requireNonEmptyRegularFile(tsPath, "repair source ts"); err != nil {
		appLogln("⚠️ repair source ts not usable:", err)
		return tsPath
	}

	s := getSettings()

	doneAbs, err := resolvePathRelativeToApp(s.DoneDir)
	if err != nil || strings.TrimSpace(doneAbs) == "" {
		doneAbs = filepath.Dir(strings.TrimSpace(finalMP4Path))
	}

	doneAbs = strings.TrimSpace(doneAbs)
	if doneAbs == "" {
		return tsPath
	}

	repairDir := filepath.Join(doneAbs, ".repair_sources")
	if err := os.MkdirAll(repairDir, 0o755); err != nil {
		appLogln("⚠️ repair source dir create failed:", err)
		return tsPath
	}

	dst, err := uniqueDestPath(repairDir, filepath.Base(tsPath))
	if err != nil {
		appLogln("⚠️ repair source unique path failed:", err)
		return tsPath
	}

	if err := renameWithRetryAggressive(tsPath, dst); err != nil {
		appLogln("⚠️ repair source move failed:", err)
		return tsPath
	}

	purgeDurationCacheForPath(tsPath)

	return dst
}

func markVideoNeedsRepairBestEffort(videoPath string, sourceTSPath string, reason string, detail string) {
	videoPath = strings.TrimSpace(videoPath)
	if videoPath == "" {
		return
	}

	assetID := strings.TrimSpace(assetIDFromVideoPath(videoPath))
	if assetID == "" {
		assetID = canonicalAssetIDFromName(filepath.Base(videoPath))
	}
	if assetID == "" {
		return
	}

	marker := map[string]any{
		"needsRepair":  true,
		"reason":       strings.TrimSpace(reason),
		"detail":       strings.TrimSpace(detail),
		"videoPath":    videoPath,
		"sourceTSPath": strings.TrimSpace(sourceTSPath),
		"createdAt":    time.Now().UTC().Format(time.RFC3339Nano),
	}

	b, err := json.MarshalIndent(marker, "", "  ")
	if err != nil {
		appLogln("⚠️ repair marker marshal failed:", err)
		return
	}

	repairPath := ""

	if _, _, _, _, metaPath, err := assetPathsForID(assetID); err == nil {
		metaPath = strings.TrimSpace(metaPath)
		if metaPath != "" {
			dir := filepath.Dir(metaPath)
			if err := os.MkdirAll(dir, 0o755); err == nil {
				repairPath = filepath.Join(dir, "repair.json")
			}
		}
	}

	if repairPath == "" {
		stem := strings.TrimSuffix(filepath.Base(videoPath), filepath.Ext(videoPath))
		repairPath = filepath.Join(filepath.Dir(videoPath), stem+".repair.json")
	}

	if err := os.WriteFile(repairPath, b, 0o644); err != nil {
		appLogln("⚠️ repair marker write failed:", err)
		return
	}

	appLogln("⚠️ video marked for deferred repair:", filepath.Base(videoPath), "marker=", repairPath)
}

func runPrimaryPostworkPipeline(
	ctx context.Context,
	job *RecordJob,
	out string,
	setPhase func(string, int),
) (string, error) {
	out = strings.TrimSpace(out)
	if err := requireNonEmptyRegularFile(out, "record output"); err != nil {
		return out, err
	}

	cleanupTSAfterMove := ""
	removeTempOutOnMoveFailure := false

	needsRepair := false
	repairReason := ""
	repairDetail := ""
	repairSourceTS := ""

	// 1) TS -> MP4 zuerst
	if strings.EqualFold(filepath.Ext(out), ".ts") {
		tsPath := out

		if setPhase != nil {
			setPhase("remuxing", 0)
		}

		fi, err := os.Stat(tsPath)
		if err != nil || fi == nil || fi.IsDir() || fi.Size() <= 0 {
			return out, appErrorf("ts invalid before remux")
		}

		inSize := fi.Size()

		mp4Path, err := buildPostworkTempMP4Path(tsPath)
		if err != nil {
			return tsPath, appErrorf("postwork temp mp4 path failed: %w", err)
		}
		_ = removeWithRetry(mp4Path)

		dur := 0.0
		dctx, cancel := context.WithTimeout(ctx, 6*time.Second)
		if d, derr := durationSecondsCached(dctx, tsPath); derr == nil && d > 0 {
			dur = d
		}
		cancel()

		err = remuxTSToMP4WithProgress(
			ctx,
			tsPath,
			mp4Path,
			dur,
			inSize,
			func(r float64) {
				if setPhase == nil {
					return
				}
				if r < 0 {
					r = 0
				}
				if r > 1 {
					r = 1
				}
				setPhase("remuxing", int(math.Round(r*100)))
			},
		)
		if err != nil {
			_ = removeWithRetry(mp4Path)
			return tsPath, appErrorf("ts remux failed: %w", err)
		}

		if err := requireNonEmptyRegularFile(mp4Path, "remux result"); err != nil {
			_ = removeWithRetry(mp4Path)
			return tsPath, err
		}

		if err := validateVideoDecodesNearEnd(ctx, mp4Path); err != nil {
			// Wichtig:
			// Nicht mehr inline reencoden. Reencode ist CPU-teuer und blockiert die postWorkQ.
			// Das remuxte MP4 bleibt erhalten und wird als "needs repair" markiert.
			appLogln("⚠️ remux mp4 decode validation failed; keeping remux result and deferring repair:", err)

			needsRepair = true
			repairReason = "decode_near_end_failed"
			repairDetail = err.Error()
			repairSourceTS = tsPath
		}

		// TS erst NACH erfolgreichem Move löschen.
		// Bei Repair-Verdacht behalten wir die TS als Reparaturquelle.
		if !needsRepair {
			cleanupTSAfterMove = tsPath
		} else {
			cleanupTSAfterMove = ""
			repairSourceTS = tsPath
		}

		removeTempOutOnMoveFailure = true
		out = mp4Path
	}

	// 2) Danach nach done verschieben
	if setPhase != nil {
		setPhase("moving", 0)
	}

	fallbackOut := out
	if cleanupTSAfterMove != "" {
		fallbackOut = cleanupTSAfterMove
	}

	moved, err := moveToDoneDir(out)
	if err != nil || strings.TrimSpace(moved) == "" {
		if removeTempOutOnMoveFailure {
			_ = removeWithRetry(out)
			purgeDurationCacheForPath(out)
		}

		if err != nil {
			return fallbackOut, appErrorf("moveToDoneDir failed: %w", err)
		}
		return fallbackOut, appErrorf("moveToDoneDir returned empty path")
	}

	out = strings.TrimSpace(moved)

	if err := requireNonEmptyRegularFile(out, "moved output"); err != nil {
		if cleanupTSAfterMove != "" {
			_ = removeWithRetry(out)
			purgeDurationCacheForPath(out)
			return cleanupTSAfterMove, err
		}
		return out, err
	}

	if needsRepair {
		keptSource := strings.TrimSpace(repairSourceTS)
		if keptSource != "" {
			keptSource = moveRepairSourceTSBestEffort(keptSource, out)
		}

		markVideoNeedsRepairBestEffort(out, keptSource, repairReason, repairDetail)
	}

	if cleanupTSAfterMove != "" {
		if err := removeWithRetry(cleanupTSAfterMove); err != nil && !os.IsNotExist(err) {
			appLogln("⚠️ ts cleanup after successful move:", err)
		}
		purgeDurationCacheForPath(cleanupTSAfterMove)
	}

	jobsMu.Lock()
	job.Output = out
	if fi, err := os.Stat(out); err == nil && fi != nil && !fi.IsDir() {
		job.SizeBytes = fi.Size()
	}
	jobsMu.Unlock()

	notifyDoneChanged()

	// 3) Danach meta.json sicher erzeugen
	if setPhase != nil {
		setPhase("probe", 15)
	}

	if _, err := ensureMetaForVideoCtx(ctx, out, job.SourceURL); err != nil {
		return out, appErrorf("meta.json generation failed: %w", err)
	}

	attachMetaToJobBestEffort(ctx, job, out)

	assetID := assetIDFromVideoPath(out)
	if assetID == "" {
		return out, appErrorf("asset id missing after move")
	}

	_, thumbPath, previewPath, _, metaPath, err := assetPathsForID(assetID)
	if err != nil {
		return out, err
	}

	if err := requireNonEmptyRegularFile(metaPath, "meta.json"); err != nil {
		return out, err
	}

	// 4) Danach preview.jpg und 5) preview.mp4
	if setPhase != nil {
		setPhase("assets", 0)
	}

	lastPct := -1
	lastTick := time.Time{}

	update := func(r float64) {
		if setPhase == nil {
			return
		}
		if r < 0 {
			r = 0
		}
		if r > 1 {
			r = 1
		}

		pct := int(math.Round(r * 100))
		if pct == lastPct {
			return
		}
		if !lastTick.IsZero() && time.Since(lastTick) < 150*time.Millisecond {
			return
		}

		lastPct = pct
		lastTick = time.Now()
		setPhase("assets", pct)
	}

	if _, err := ensurePrimaryAssetsForVideoWithProgressCtx(ctx, out, job.SourceURL, update); err != nil {
		return out, appErrorf("primary assets failed: %w", err)
	}

	if err := requireNonEmptyRegularFile(thumbPath, "preview.jpg"); err != nil {
		return out, err
	}
	if err := requireNonEmptyRegularFile(previewPath, "preview.mp4"); err != nil {
		return out, err
	}

	attachMetaToJobBestEffort(ctx, job, out)

	if setPhase != nil {
		setPhase("assets", 100)
	}

	return out, nil
}

func runJob(ctx context.Context, job *RecordJob, req RecordRequest) {
	now := ensureJobStartInitialized(job)

	hc := NewHTTPClient(req.UserAgent)
	err := runProviderRecording(ctx, job, req, hc, now)

	target, out := finalizeRecordingAttempt(job, err)

	if !prepareOutputForPostwork(job, target, out) {
		return
	}

	out = strings.TrimSpace(job.Output)
	if out == "" {
		removeJobAndPublish(job)
		return
	}

	enqueuePostworkOrFail(job, out, target)
}

func ensureJobStartInitialized(job *RecordJob) time.Time {
	now := job.StartedAt
	if now.IsZero() {
		now = time.Now()
	}

	if job.StartedAtMs == 0 {
		base := job.StartedAt
		if base.IsZero() {
			base = time.Now()

			jobsMu.Lock()
			job.StartedAt = base
			jobsMu.Unlock()
		}

		jobsMu.Lock()
		job.StartedAtMs = base.UnixMilli()
		jobsMu.Unlock()
	}

	setJobProgress(job, "recording", 0)
	return now
}

func runProviderRecording(
	ctx context.Context,
	job *RecordJob,
	req RecordRequest,
	hc *HTTPClient,
	now time.Time,
) error {
	switch detectProvider(req.URL) {
	case "chaturbate":
		return runChaturbateRecording(ctx, job, req, hc, now)
	case "mfc":
		return runMFCRecording(ctx, job, req, hc, now)
	default:
		return errors.New("unsupported provider")
	}
}

func runChaturbateRecording(
	ctx context.Context,
	job *RecordJob,
	req RecordRequest,
	hc *HTTPClient,
	now time.Time,
) error {
	if !hasChaturbateCookies(req.Cookie) {
		return errors.New("cf_clearance und session_id (oder sessionid) Cookies sind für Chaturbate erforderlich")
	}

	s := getSettings()
	recordDirAbs, err := resolvePathRelativeToApp(s.RecordDir)
	if err != nil || strings.TrimSpace(recordDirAbs) == "" {
		return appErrorf("recordDir auflösung fehlgeschlagen: %v", err)
	}

	_ = os.MkdirAll(recordDirAbs, 0o755)

	username := extractUsername(req.URL)
	filename := fmt.Sprintf("%s_%s.ts", username, now.Format("01_02_2006__15-04-05"))

	jobsMu.Lock()
	existingOut := strings.TrimSpace(job.Output)
	jobsMu.Unlock()

	outPath := existingOut
	if outPath == "" || !filepath.IsAbs(outPath) {
		outPath = filepath.Join(recordDirAbs, filename)
	}

	if strings.TrimSpace(existingOut) != strings.TrimSpace(outPath) {
		jobsMu.Lock()
		job.Output = outPath
		jobsMu.Unlock()
	}

	markModelPublicWhileRecording(job)

	return RecordStream(ctx, hc, "https://chaturbate.com/", username, outPath, req.Cookie, job)
}

func runMFCRecording(
	ctx context.Context,
	job *RecordJob,
	req RecordRequest,
	hc *HTTPClient,
	now time.Time,
) error {
	s := getSettings()
	recordDirAbs, err := resolvePathRelativeToApp(s.RecordDir)
	if err != nil || strings.TrimSpace(recordDirAbs) == "" {
		return appErrorf("recordDir auflösung fehlgeschlagen: %v", err)
	}

	_ = os.MkdirAll(recordDirAbs, 0o755)

	username := extractMFCUsername(req.URL)
	filename := fmt.Sprintf("%s_%s.ts", username, now.Format("01_02_2006__15-04-05"))
	outPath := filepath.Join(recordDirAbs, filename)

	jobsMu.Lock()
	job.Output = outPath
	jobsMu.Unlock()

	return RecordStreamMFC(ctx, hc, username, outPath, job)
}

func finalizeRecordingAttempt(job *RecordJob, runErr error) (JobStatus, string) {
	end := time.Now()

	target := JobFinished
	var errText string

	if runErr != nil {
		if errors.Is(runErr, context.Canceled) {
			target = JobStopped
		} else {
			target = JobFailed
			errText = runErr.Error()
		}
	}

	stopPreview(job)

	jobsMu.Lock()
	job.EndedAt = &end
	job.EndedAtMs = end.UnixMilli()
	job.Status = target
	if errText != "" {
		job.Error = errText
	}
	job.Phase = "postwork"
	out := strings.TrimSpace(job.Output)
	jobsMu.Unlock()

	return target, out
}

func prepareOutputForPostwork(job *RecordJob, target JobStatus, out string) bool {
	if strings.TrimSpace(out) == "" {
		clearJobPostworkState(job)
		removeJobAndPublish(job)
		return false
	}

	if !ensureUsableRecordedOutput(job, target, out) {
		return false
	}

	if maybeDeleteSmallRecordedOutput(job, out) {
		return false
	}

	return true
}

func ensureUsableRecordedOutput(job *RecordJob, target JobStatus, out string) bool {
	var (
		fi  os.FileInfo
		err error
	)

	if target == JobStopped {
		fi, err = waitForUsableOutput(out, 3*time.Second)
	} else {
		fi, err = os.Stat(out)
	}

	if err == nil && fi != nil && !fi.IsDir() && fi.Size() > 0 {
		return true
	}

	if target == JobStopped && shouldKeepStoppedJobForInspection(target, out) {
		clearJobPostworkState(job)
		return false
	}

	_ = removeWithRetry(out)
	purgeDurationCacheForPath(out)
	removeJobAndPublish(job)
	return false
}

func favoriteProtectionModelKeyForDownload(out string, sourceURL string) (host string, modelKey string) {
	sourceURL = strings.TrimSpace(sourceURL)

	if sourceURL != "" {
		switch detectProvider(sourceURL) {
		case "chaturbate":
			host = "chaturbate.com"
			modelKey = strings.TrimSpace(extractUsername(sourceURL))
		case "mfc":
			host = "myfreecams.com"
			modelKey = strings.TrimSpace(extractMFCUsername(sourceURL))
		}
	}

	if strings.TrimSpace(modelKey) == "" {
		stem := strings.TrimSuffix(filepath.Base(strings.TrimSpace(out)), filepath.Ext(out))
		stem = stripHotPrefix(stem)
		modelKey = sanitizeModelKey(strings.TrimSpace(modelNameFromFilename(stem)))
	}

	return strings.TrimSpace(host), strings.ToLower(strings.TrimSpace(modelKey))
}

func isFavoriteProtectedDownload(out string, sourceURL string) bool {
	s := getSettings()
	if !s.AutoDeleteSmallDownloadsKeepFavorites {
		return false
	}

	host, modelKey := favoriteProtectionModelKeyForDownload(out, sourceURL)
	if modelKey == "" {
		return false
	}

	store := getModelStore()
	if store == nil {
		return false
	}

	return store.IsFavoriteModel(host, modelKey)
}

func maybeDeleteSmallRecordedOutput(job *RecordJob, out string) bool {
	fi, err := os.Stat(out)
	if err != nil || fi == nil || fi.IsDir() {
		return false
	}

	jobsMu.Lock()
	job.SizeBytes = fi.Size()
	jobsMu.Unlock()

	s := getSettings()
	minMB := s.AutoDeleteSmallDownloadsBelowMB
	if !s.AutoDeleteSmallDownloads || minMB <= 0 {
		return false
	}

	threshold := int64(minMB) * 1024 * 1024
	if fi.Size() <= 0 || fi.Size() >= threshold {
		return false
	}

	if isFavoriteProtectedDownload(out, job.SourceURL) {
		appLogln("⭐ auto-delete skipped for favorite:", filepath.Base(out))
		return false
	}

	base := filepath.Base(out)
	id := stripHotPrefix(strings.TrimSuffix(base, filepath.Ext(base)))

	if derr := removeWithRetry(out); derr == nil || os.IsNotExist(derr) {
		removeGeneratedForID(id)
		purgeDurationCacheForPath(out)
		removeJobAndPublish(job)
		return true
	} else {
		appLogln("⚠️ auto-delete before enqueue failed:", derr)
	}

	return false
}

func clearJobPostworkState(job *RecordJob) {
	jobsMu.Lock()
	job.Phase = ""
	job.Progress = 100
	job.PostWorkKey = ""
	job.PostWork = nil
	jobsMu.Unlock()
}

func removeJobAndPublish(job *RecordJob) {
	jobsMu.Lock()
	delete(jobs, job.ID)
	jobsMu.Unlock()

	publishJobRemove(job)
}

func enqueuePostworkOrFail(job *RecordJob, out string, postTarget JobStatus) {
	postKey := "postwork:" + job.ID
	postFile := filepath.Base(out)
	postAssetID := assetIDFromVideoPath(out)

	_, _, maxParallel := postWorkQ.Stats()
	sortBucket, sortName := postWorkSortForVideoPath(out)
	addedAt := time.Now()

	jobsMu.Lock()
	job.Phase = "postwork"
	job.PostWorkKey = postKey
	job.PostWork = &PostWorkKeyStatus{
		State:       "queued",
		Position:    0,
		Waiting:     0,
		Running:     0,
		MaxParallel: maxParallel,
	}
	jobsMu.Unlock()

	okQueued := postWorkQ.Enqueue(PostWorkTask{
		Key:        postKey,
		Path:       out,
		Added:      addedAt,
		SortBucket: sortBucket,
		SortName:   sortName,
		Run: func(ctx context.Context) error {
			return runQueuedPostwork(ctx, job, out, postTarget, postKey)
		},
	})

	if okQueued {
		publishQueuedPostworkState(job, postKey, postFile, postAssetID)
		return
	}

	handlePostworkEnqueueFailure(job, out, postTarget, postFile, postAssetID)
}

func publishQueuedPostworkState(job *RecordJob, postKey, postFile, postAssetID string) {
	st := postWorkQ.StatusForKey(postKey)

	jobsMu.Lock()
	job.PostWork = &st
	jobsMu.Unlock()

	publishFinishedPostworkStatusForJob(job, finishedPostworkEvent{
		File:        postFile,
		AssetID:     postAssetID,
		Queue:       "postwork",
		State:       "queued",
		Phase:       "postwork",
		Label:       "Warte auf Nachbearbeitung…",
		Position:    st.Position,
		Waiting:     st.Waiting,
		Running:     st.Running,
		MaxParallel: st.MaxParallel,
	})
}

func handlePostworkEnqueueFailure(job *RecordJob, out string, postTarget JobStatus, postFile, postAssetID string) {
	jobsMu.Lock()
	job.Status = postTarget
	job.Phase = ""
	job.Progress = 100
	job.PostWorkKey = ""
	job.PostWork = nil
	job.Error = "Nachbearbeitung konnte nicht eingeplant werden"
	jobsMu.Unlock()

	if shouldKeepStoppedJobForInspection(postTarget, out) {
		_ = publishJob(job.ID)

		publishFinishedPostworkStatusForJob(job, finishedPostworkEvent{
			File:    postFile,
			AssetID: postAssetID,
			Queue:   "postwork",
			State:   "error",
			Phase:   "postwork",
			Label:   "Nachbearbeitung konnte nicht eingeplant werden",
		})
		return
	}

	removeJobAndPublish(job)

	publishFinishedPostworkStatusForJob(job, finishedPostworkEvent{
		File:    postFile,
		AssetID: postAssetID,
		Queue:   "postwork",
		State:   "error",
		Phase:   "postwork",
		Label:   "Nachbearbeitung konnte nicht eingeplant werden",
	})
}

func runQueuedPostwork(
	ctx context.Context,
	job *RecordJob,
	initialOut string,
	postTarget JobStatus,
	postKey string,
) error {
	out := strings.TrimSpace(initialOut)
	if out == "" {
		clearJobPostworkState(job)
		removeJobAndPublish(job)
		return nil
	}

	publishRunningPostworkStart(job, postKey, out)

	setPhase := buildPostworkPhaseUpdater(job, postKey, &out)

	var err error
	out, err = runPrimaryPostworkPipeline(ctx, job, out, setPhase)
	if err != nil {
		handlePrimaryPostworkFailure(job, out, postTarget, err)
		return nil
	}

	handlePrimaryPostworkSuccess(job, out, postTarget)
	return nil
}

func publishRunningPostworkStart(job *RecordJob, postKey, out string) {
	st := postWorkQ.StatusForKey(postKey)

	jobsMu.Lock()
	job.PostWork = &st
	jobsMu.Unlock()

	setJobProgress(job, "postwork", 0)

	publishFinishedPostworkStatusForJob(job, finishedPostworkEvent{
		File:        filepath.Base(out),
		AssetID:     assetIDFromVideoPath(out),
		Queue:       "postwork",
		State:       "running",
		Phase:       "postwork",
		Label:       "Nachbearbeitung läuft…",
		Position:    st.Position,
		Waiting:     st.Waiting,
		Running:     st.Running,
		MaxParallel: st.MaxParallel,
	})
}

func buildPostworkPhaseUpdater(job *RecordJob, postKey string, out *string) func(string, int) {
	return func(phase string, pct int) {
		setJobProgress(job, phase, pct)

		st := postWorkQ.StatusForKey(postKey)

		jobsMu.Lock()
		job.PostWork = &st
		jobsMu.Unlock()

		label := "Nachbearbeitung läuft…"
		switch strings.ToLower(strings.TrimSpace(phase)) {
		case "remuxing":
			label = "Remux läuft…"
		case "moving":
			label = "Verschiebe Datei…"
		case "probe":
			label = "Analysiere Datei…"
		case "assets":
			label = "Erstelle Preview…"
		case "analyze":
			label = "Analysiere Inhalt…"
		}

		currentOut := ""
		if out != nil {
			currentOut = strings.TrimSpace(*out)
		}

		publishFinishedPostworkStatusForJob(job, finishedPostworkEvent{
			File:        filepath.Base(currentOut),
			AssetID:     assetIDFromVideoPath(currentOut),
			Queue:       "postwork",
			State:       "running",
			Phase:       phase,
			Label:       label,
			Position:    st.Position,
			Waiting:     st.Waiting,
			Running:     st.Running,
			MaxParallel: st.MaxParallel,
		})
	}
}

func publishDeferredPhase(fileName, assetID, queue, phase, state, label string, err error) {
	errText := ""
	if err != nil {
		errText = strings.TrimSpace(err.Error())
	}

	publishFinishedPostworkPhase(
		fileName,
		assetID,
		queue,
		phase,
		state,
		label,
		errText,
	)
}

func runDeferredEnrichPipeline(ctx context.Context, outPath string, sourceURL string) error {
	outPath = strings.TrimSpace(outPath)
	if outPath == "" {
		return appErrorf("output path leer")
	}

	fileName := filepath.Base(outPath)
	assetID := assetIDFromVideoPath(outPath)
	if assetID == "" {
		return appErrorf("asset id fehlt")
	}

	requiredGoals := requiredAnalyzeGoals()

	// best effort sourceURL aus meta.json nachziehen, falls leer
	if strings.TrimSpace(sourceURL) == "" {
		if _, _, _, _, metaPath, err := assetPathsForID(assetID); err == nil {
			if fi, serr := os.Stat(outPath); serr == nil && fi != nil && !fi.IsDir() && fi.Size() > 0 {
				if u, ok := readVideoMetaSourceURL(metaPath, fi); ok {
					sourceURL = u
				}
			}
		}
	}

	abortIfCanceled := func(stepErr error, queue string, phase string) error {
		if errors.Is(stepErr, context.Canceled) ||
			errors.Is(stepErr, context.DeadlineExceeded) ||
			ctx.Err() != nil {
			publishDeferredPhase(fileName, assetID, queue, phase, "missing", "", nil)
			return context.Canceled
		}
		return nil
	}

	waitBeforeHeavyStep := func(queue string, phase string) error {
		if err := ctx.Err(); err != nil {
			publishDeferredPhase(fileName, assetID, queue, phase, "missing", "", nil)
			return context.Canceled
		}

		if err := waitUntilEnrichMayRun(ctx); err != nil {
			publishDeferredPhase(fileName, assetID, queue, phase, "missing", "", nil)
			return err
		}

		if err := ctx.Err(); err != nil {
			publishDeferredPhase(fileName, assetID, queue, phase, "missing", "", nil)
			return context.Canceled
		}

		return nil
	}

	truth := assetsTruthForVideo(outPath)

	// -------------------------------------------------
	// Fehlende Vorstufen nur nachziehen, NICHT alles neu
	// -------------------------------------------------

	if !truth.MetaReady {
		if err := waitBeforeHeavyStep("postwork", "meta"); err != nil {
			return err
		}

		publishDeferredPhase(fileName, assetID, "postwork", "meta", "running", "Meta", nil)

		okMeta, err := ensureMetaForVideoCtx(ctx, outPath, sourceURL)
		if cerr := abortIfCanceled(err, "postwork", "meta"); cerr != nil {
			return cerr
		}
		if err != nil || !okMeta || !assetsTruthForVideo(outPath).MetaReady {
			if err == nil {
				err = appErrorf("meta konnte nicht erzeugt werden")
			}
			publishDeferredPhase(fileName, assetID, "postwork", "meta", "error", "Meta fehlgeschlagen", err)
			return err
		}

		publishDeferredPhase(fileName, assetID, "postwork", "meta", "done", "Meta", nil)
		truth = assetsTruthForVideo(outPath)
	}

	if !truth.ThumbReady {
		if err := waitBeforeHeavyStep("postwork", "thumb"); err != nil {
			return err
		}

		publishDeferredPhase(fileName, assetID, "postwork", "thumb", "running", "Vorschaubild", nil)

		_, err := ensurePrimaryAssetsForVideoWithProgressCtx(ctx, outPath, sourceURL, nil)
		if cerr := abortIfCanceled(err, "postwork", "thumb"); cerr != nil {
			return cerr
		}
		if err != nil || !assetsTruthForVideo(outPath).ThumbReady {
			if err == nil {
				err = appErrorf("vorschaubild konnte nicht erzeugt werden")
			}
			publishDeferredPhase(fileName, assetID, "postwork", "thumb", "error", "Vorschaubild fehlgeschlagen", err)
			return err
		}

		publishDeferredPhase(fileName, assetID, "postwork", "thumb", "done", "Vorschaubild", nil)
		truth = assetsTruthForVideo(outPath)
	}

	if !truth.TeaserReady {
		if err := waitBeforeHeavyStep("postwork", "teaser"); err != nil {
			return err
		}

		publishDeferredPhase(fileName, assetID, "postwork", "teaser", "running", "Teaser", nil)

		_, err := ensureTeaserForVideoCtx(ctx, outPath, sourceURL)
		if cerr := abortIfCanceled(err, "postwork", "teaser"); cerr != nil {
			return cerr
		}
		if err != nil || !assetsTruthForVideo(outPath).TeaserReady {
			if err == nil {
				err = appErrorf("teaser konnte nicht erzeugt werden")
			}
			publishDeferredPhase(fileName, assetID, "postwork", "teaser", "error", "Teaser fehlgeschlagen", err)
			return err
		}

		publishDeferredPhase(fileName, assetID, "postwork", "teaser", "done", "Teaser", nil)
		truth = assetsTruthForVideo(outPath)
	}

	var firstErr error

	// -------------------------------------------------
	// Langsame Hintergrundphase: Sprite
	// -------------------------------------------------

	if !truth.SpritesReady {
		if err := waitBeforeHeavyStep("postwork", "sprites"); err != nil {
			return err
		}

		publishDeferredPhase(fileName, assetID, "postwork", "sprites", "running", "Sprites", nil)

		_, err := ensureSpritesForVideoCtx(ctx, outPath, sourceURL)
		if cerr := abortIfCanceled(err, "postwork", "sprites"); cerr != nil {
			return cerr
		}
		if err != nil || !assetsTruthForVideo(outPath).SpritesReady {
			if err == nil {
				err = appErrorf("sprites konnten nicht erzeugt werden")
			}
			publishDeferredPhase(fileName, assetID, "postwork", "sprites", "error", "Sprites fehlgeschlagen", err)
			if firstErr == nil {
				firstErr = err
			}
		} else {
			// Best effort. Wenn währenddessen postWork reinkommt, beendet ctx diesen Check.
			if _, checkErr := runTailBlackoutCheck(ctx, outPath); checkErr != nil {
				appLogln("⚠️ sprite tail blackout check failed:", outPath, checkErr)
			}

			publishDeferredPhase(fileName, assetID, "postwork", "sprites", "done", "Sprites", nil)
		}
	}

	truth = assetsTruthForVideo(outPath)

	// Ohne Sprite kann keine Sprite-basierte Analyse laufen.
	if !truth.SpritesReady {
		if firstErr == nil {
			firstErr = appErrorf("Analysen übersprungen: preview-sprite.jpg fehlt")
		}
		return firstErr
	}

	// -------------------------------------------------
	// Langsame Hintergrundphase: NSFW + Highlights zusammen
	// -------------------------------------------------

	analyzeReady := hasAIResultsForAllOutputGoals(outPath, requiredGoals)

	if !analyzeReady {
		if err := waitBeforeHeavyStep("enrich", "analyze"); err != nil {
			return err
		}

		publishDeferredPhase(fileName, assetID, "enrich", "analyze", "running", "Analysen", nil)

		_, err := ensureAnalyzeAllGoalsForVideoCtx(ctx, outPath, sourceURL)
		if cerr := abortIfCanceled(err, "enrich", "analyze"); cerr != nil {
			return cerr
		}

		analyzeReady = hasAIResultsForAllOutputGoals(outPath, requiredGoals)

		if err != nil || !analyzeReady {
			if err == nil {
				err = appErrorf("Analysen konnten nicht erzeugt werden")
			}
			publishDeferredPhase(fileName, assetID, "enrich", "analyze", "error", "Analysen fehlgeschlagen", err)
			if firstErr == nil {
				firstErr = err
			}
		} else {
			publishDeferredPhase(fileName, assetID, "enrich", "analyze", "done", "Analysen", nil)
		}
	}

	return firstErr
}

func handlePrimaryPostworkFailure(job *RecordJob, out string, postTarget JobStatus, err error) {
	finalStatus := JobFailed
	if postTarget == JobStopped {
		finalStatus = JobStopped
	}

	jobsMu.Lock()
	job.Status = finalStatus
	job.Error = err.Error()
	job.Output = out
	job.Phase = ""
	job.Progress = 100
	job.PostWorkKey = ""
	job.PostWork = nil
	jobsMu.Unlock()

	if shouldKeepStoppedJobForInspection(postTarget, out) {
		_ = publishJob(job.ID)

		publishFinishedPostworkStatusForJob(job, finishedPostworkEvent{
			File:    filepath.Base(out),
			AssetID: assetIDFromVideoPath(out),
			Queue:   "postwork",
			State:   "error",
			Phase:   "postwork",
			Label:   "Primäre Nachbearbeitung fehlgeschlagen",
		})
		return
	}

	publishFinishedPostworkStatusForJob(job, finishedPostworkEvent{
		File:    filepath.Base(out),
		AssetID: assetIDFromVideoPath(out),
		Queue:   "postwork",
		State:   "error",
		Phase:   "postwork",
		Label:   "Primäre Nachbearbeitung fehlgeschlagen",
	})

	removeJobAndPublish(job)
}

func handlePrimaryPostworkSuccess(job *RecordJob, out string, postTarget JobStatus) {
	finalFile := filepath.Base(out)
	finalAssetID := assetIDFromVideoPath(out)

	jobsMu.Lock()
	job.Status = postTarget
	job.Phase = ""
	job.Progress = 100
	job.PostWorkKey = ""
	job.PostWork = nil
	jobsMu.Unlock()

	publishFinishedPostworkStatusForJob(job, finishedPostworkEvent{
		File:    finalFile,
		AssetID: finalAssetID,
		Queue:   "postwork",
		State:   "done",
		Label:   "Primäre Nachbearbeitung fertig",
	})

	if ok := enqueueDeferredAssetsAndAI(job, out, job.SourceURL); !ok {
		appLogln("⚠️ deferred enrichment enqueue failed:", out)
	}

	if postTarget == JobStopped {
		_ = publishJob(job.ID)
		return
	}

	removeJobAndPublish(job)
}