nsfwapp/backend/rating.go

// backend\rating.go

package main

import (
	"math"
	"sort"
	"strings"
)

type aiRatingMeta struct {
	Score                  float64 `json:"score"`
	ActionScore            float64 `json:"actionScore"`
	BestPosition           string  `json:"bestPosition,omitempty"`
	BestPositionRank       int     `json:"bestPositionRank,omitempty"`
	BestClothing           string  `json:"bestClothing,omitempty"`
	BestClothingRank       int     `json:"bestClothingRank,omitempty"`
	PositionScore          float64 `json:"positionScore"`
	ClothingScore          float64 `json:"clothingScore"`
	DurationScore          float64 `json:"durationScore"`
	StrengthScore          float64 `json:"strengthScore"`
	CoverageScore          float64 `json:"coverageScore"`
	ContextScore           float64 `json:"contextScore"`
	VarietyScore           float64 `json:"varietyScore"`
	Stars                  int     `json:"stars"`
	Segments               int     `json:"segments"`
	SegmentsPerMinute      float64 `json:"segmentsPerMinute"`
	FlaggedSeconds         float64 `json:"flaggedSeconds"`
	WeightedFlaggedSeconds float64 `json:"weightedFlaggedSeconds"`
	CoverageRatio          float64 `json:"coverageRatio"`
	WeightedCoverageRatio  float64 `json:"weightedCoverageRatio"`
	LongestSegmentSeconds  float64 `json:"longestSegmentSeconds"`
	AvgConfidence          float64 `json:"avgConfidence"`
}

const (
	// Normales Zusammenziehen sehr kurzer Pausen.
	ratingMaxSilentGapSec = 4.5

	// Größere Lücken dürfen überbrückt werden,
	// wenn beide Seiten stark genug / thematisch ähnlich sind.
	ratingBridgeStrongGapSec = 12.0

	ratingMinSegmentDurationSec = 2.5
)

func ratingClamp01(v float64) float64 {
	if v < 0 {
		return 0
	}
	if v > 1 {
		return 1
	}
	return v
}

func ratingRound(v float64, places int) float64 {
	p := math.Pow(10, float64(places))
	return math.Round(v*p) / p
}

func ratingSmoothStep(v float64) float64 {
	v = ratingClamp01(v)
	return v * v * (3 - 2*v)
}

func ratingSaturatingEvidence(value, scale float64) float64 {
	if value <= 0 || scale <= 0 {
		return 0
	}
	return ratingClamp01(1 - math.Exp(-value/scale))
}

func ratingEffectiveDurationSeconds(seconds float64) float64 {
	if seconds <= 0 {
		return 0
	}

	// Lange Segmente zählen, aber nicht linear unendlich stark.
	const kneeSeconds = 26.0
	return kneeSeconds * math.Log1p(seconds/kneeSeconds)
}

func normalizeSegmentLabel(label string) string {
	label = strings.ToLower(strings.TrimSpace(label))

	label = strings.TrimPrefix(label, "detector:")
	label = strings.TrimPrefix(label, "body:")
	label = strings.TrimPrefix(label, "object:")
	label = strings.TrimPrefix(label, "clothing:")
	label = strings.TrimPrefix(label, "position:")
	label = strings.TrimPrefix(label, "person:")

	return strings.TrimSpace(label)
}

func isPersonSegmentLabel(label string) bool {
	label = strings.ToLower(strings.TrimSpace(label))

	label = strings.TrimPrefix(label, "detector:")
	label = strings.TrimPrefix(label, "body:")
	label = strings.TrimPrefix(label, "object:")
	label = strings.TrimPrefix(label, "clothing:")
	label = strings.TrimPrefix(label, "position:")
	label = strings.TrimPrefix(label, "person:")

	switch label {
	case "person",
		"person_unknown",
		"person_male",
		"person_female",
		"male_person",
		"female_person",
		"people_male",
		"people_female":
		return true
	default:
		return false
	}
}

func isKnownPositionLabel(label string) bool {
	label = strings.ToLower(strings.TrimSpace(label))
	if isNoSexPositionLabel(label) {
		return false
	}

	switch label {
	case "missionary",
		"doggy",
		"doggystyle",
		"cowgirl",
		"reverse_cowgirl",
		"cunnilingus",
		"prone_bone",
		"standing",
		"standing_doggy",
		"spooning",
		"facesitting",
		"handjob",
		"blowjob",
		"boobjob",
		"toy_play",
		"fingering",
		"69":
		return true
	default:
		return false
	}
}

type explicitRatingRank struct {
	Rank   int
	Weight float64
}

func positionExplicitRatingRank(label string) explicitRatingRank {
	label = strings.ToLower(strings.TrimSpace(label))

	switch label {
	case "cowgirl":
		return explicitRatingRank{Rank: 1, Weight: 1.00}
	case "reverse_cowgirl":
		return explicitRatingRank{Rank: 2, Weight: 0.99}
	case "doggy", "doggystyle", "standing_doggy":
		return explicitRatingRank{Rank: 3, Weight: 0.98}
	case "toy_play":
		return explicitRatingRank{Rank: 4, Weight: 0.96}
	case "fingering":
		return explicitRatingRank{Rank: 5, Weight: 0.94}
	case "missionary":
		return explicitRatingRank{Rank: 6, Weight: 0.92}
	case "prone_bone":
		return explicitRatingRank{Rank: 7, Weight: 0.90}
	case "spooning":
		return explicitRatingRank{Rank: 8, Weight: 0.86}
	case "standing":
		return explicitRatingRank{Rank: 9, Weight: 0.56}
	case "69", "facesitting":
		return explicitRatingRank{Rank: 10, Weight: 0.54}
	case "blowjob", "handjob", "cunnilingus", "boobjob":
		return explicitRatingRank{Rank: 11, Weight: 0.52}
	default:
		return explicitRatingRank{}
	}
}

func positionSeverityWeight(label string) float64 {
	return positionExplicitRatingRank(label).Weight
}

func bodyPartSeverityWeight(label string) float64 {
	label = strings.ToLower(strings.TrimSpace(label))

	switch label {
	case "pussy", "vulva":
		return 1.00
	case "penis":
		return 0.95
	case "anus":
		return 0.90
	case "breasts":
		return 0.80
	case "ass", "buttocks":
		return 0.66
	case "tongue":
		return 0.46
	default:
		return 0.00
	}
}

func objectSeverityWeight(label string) float64 {
	label = strings.ToLower(strings.TrimSpace(label))

	switch label {
	case "dildo", "vibrator", "strapon", "buttplug":
		return 0.86
	case "handcuffs", "blindfold", "collar":
		return 0.58
	case "shower":
		return 0.42
	case "towel":
		return 0.28
	default:
		return 0.00
	}
}

func clothingExplicitRatingRank(label string) explicitRatingRank {
	label = strings.ToLower(strings.TrimSpace(label))

	switch label {
	case "lingerie":
		return explicitRatingRank{Rank: 1, Weight: 0.62}
	case "stockings":
		return explicitRatingRank{Rank: 2, Weight: 0.57}
	case "skirt":
		return explicitRatingRank{Rank: 3, Weight: 0.52}
	case "hotpants":
		return explicitRatingRank{Rank: 4, Weight: 0.47}
	case "bikini":
		return explicitRatingRank{Rank: 5, Weight: 0.44}
	case "bra":
		return explicitRatingRank{Rank: 6, Weight: 0.41}
	case "panties":
		return explicitRatingRank{Rank: 7, Weight: 0.36}
	case "croptop":
		return explicitRatingRank{Rank: 8, Weight: 0.31}
	case "heels":
		return explicitRatingRank{Rank: 9, Weight: 0.26}
	case "dress":
		return explicitRatingRank{Rank: 10, Weight: 0.22}
	default:
		return explicitRatingRank{}
	}
}

func clothingSeverityWeight(label string) float64 {
	return clothingExplicitRatingRank(label).Weight
}

func personContextWeight(label string) float64 {
	if !isPersonSegmentLabel(label) {
		return 0
	}

	// Personen sind Kontext, aber nie alleiniger Rating-Treiber.
	return 0.18
}

func detectorSeverityWeight(label string) float64 {
	label = strings.ToLower(strings.TrimSpace(label))

	if isPersonSegmentLabel(label) {
		return personContextWeight(label)
	}

	if w := bodyPartSeverityWeight(label); w > 0 {
		return w
	}
	if w := objectSeverityWeight(label); w > 0 {
		return w
	}
	if w := clothingSeverityWeight(label); w > 0 {
		return w
	}
	if isKnownPositionLabel(label) {
		return positionSeverityWeight(label)
	}

	return 0.00
}

type ratingSignalSet struct {
	Position float64
	Body     float64
	Object   float64
	Clothing float64
	Person   float64

	HasPosition bool
	HasBody     bool
	HasObject   bool
	HasClothing bool
	HasPerson   bool
}

func normalizeRatingSignalLabel(label string) string {
	label = strings.ToLower(strings.TrimSpace(label))
	if isNoSexPositionLabel(label) {
		return ""
	}

	if strings.HasPrefix(label, "combo:") {
		return label
	}

	if strings.HasPrefix(label, "detector:") {
		return normalizeRatingSignalLabel(strings.TrimPrefix(label, "detector:"))
	}

	if strings.HasPrefix(label, "position:") {
		raw := strings.TrimPrefix(label, "position:")
		if isKnownPositionLabel(raw) && positionSeverityWeight(raw) > 0 {
			return "position:" + raw
		}
		return ""
	}

	if strings.HasPrefix(label, "body:") {
		raw := strings.TrimPrefix(label, "body:")
		if bodyPartSeverityWeight(raw) > 0 {
			return "body:" + raw
		}
		return ""
	}

	if strings.HasPrefix(label, "object:") {
		raw := strings.TrimPrefix(label, "object:")
		if objectSeverityWeight(raw) > 0 {
			return "object:" + raw
		}
		return ""
	}

	if strings.HasPrefix(label, "clothing:") {
		raw := strings.TrimPrefix(label, "clothing:")
		if clothingSeverityWeight(raw) > 0 {
			return "clothing:" + raw
		}
		return ""
	}

	if strings.HasPrefix(label, "person:") {
		raw := strings.TrimPrefix(label, "person:")
		if isPersonSegmentLabel(raw) {
			return "person:" + normalizeSegmentLabel(raw)
		}
		return ""
	}

	raw := normalizeSegmentLabel(label)
	if isNoSexPositionLabel(raw) {
		return ""
	}

	if isPersonSegmentLabel(raw) {
		return "person:" + raw
	}
	if isKnownPositionLabel(raw) && positionSeverityWeight(raw) > 0 {
		return "position:" + raw
	}
	if bodyPartSeverityWeight(raw) > 0 {
		return "body:" + raw
	}
	if objectSeverityWeight(raw) > 0 {
		return "object:" + raw
	}
	if clothingSeverityWeight(raw) > 0 {
		return "clothing:" + raw
	}

	return ""
}

func ratingSignalSetAddLabel(set *ratingSignalSet, label string) {
	label = normalizeRatingSignalLabel(label)
	if label == "" {
		return
	}

	switch {
	case strings.HasPrefix(label, "position:"):
		raw := strings.TrimPrefix(label, "position:")
		w := positionSeverityWeight(raw)
		if w > set.Position {
			set.Position = w
		}
		if w > 0 {
			set.HasPosition = true
		}

	case strings.HasPrefix(label, "body:"):
		raw := strings.TrimPrefix(label, "body:")
		w := bodyPartSeverityWeight(raw)
		if w > set.Body {
			set.Body = w
		}
		if w > 0 {
			set.HasBody = true
		}

	case strings.HasPrefix(label, "object:"):
		raw := strings.TrimPrefix(label, "object:")
		w := objectSeverityWeight(raw)
		if w > set.Object {
			set.Object = w
		}
		if w > 0 {
			set.HasObject = true
		}

	case strings.HasPrefix(label, "clothing:"):
		raw := strings.TrimPrefix(label, "clothing:")
		w := clothingSeverityWeight(raw)
		if w > set.Clothing {
			set.Clothing = w
		}
		if w > 0 {
			set.HasClothing = true
		}

	case strings.HasPrefix(label, "person:"):
		raw := strings.TrimPrefix(label, "person:")
		w := personContextWeight(raw)
		if w > set.Person {
			set.Person = w
		}
		if w > 0 {
			set.HasPerson = true
		}
	}
}

func ratingSignalSetFromLabel(label string) ratingSignalSet {
	label = strings.ToLower(strings.TrimSpace(label))

	var set ratingSignalSet

	if strings.HasPrefix(label, "combo:") {
		raw := strings.TrimPrefix(label, "combo:")
		for _, part := range strings.Split(raw, "+") {
			ratingSignalSetAddLabel(&set, part)
		}
		return set
	}

	ratingSignalSetAddLabel(&set, label)
	return set
}

func ratingSignalSetHasInterestingContent(set ratingSignalSet) bool {
	return set.HasPosition || set.HasBody || set.HasObject || set.HasClothing
}

func contextualSegmentSeverityWeight(label string) float64 {
	set := ratingSignalSetFromLabel(label)
	return contextualSegmentSeverityWeightFromSet(set)
}

func comboSegmentSeverityWeight(label string) float64 {
	set := ratingSignalSetFromLabel(label)
	return contextualSegmentSeverityWeightFromSet(set)
}

func contextualSegmentSeverityWeightFromSet(set ratingSignalSet) float64 {
	if !ratingSignalSetHasInterestingContent(set) {
		return 0
	}

	var score float64

	if set.HasPosition {
		// Position soll das Hauptkriterium sein.
		// Sexuelle Körperteile und explizite Kleidung verstärken die Position.
		score =
			0.82*set.Position +
				0.12*set.Body +
				0.08*set.Clothing +
				0.015*set.Object +
				0.005*set.Person

		if set.HasBody {
			score += 0.030
		}
		if set.HasClothing {
			score += 0.020
		}
		if set.HasObject {
			score += 0.006
		}
		if set.HasPerson {
			score += 0.002
		}

		// Standing ohne echten Kontext klar schwächer halten.
		if set.Position < 0.60 && !set.HasBody && !set.HasObject && !set.HasClothing {
			// Den Rang innerhalb der schwachen Positionen erhalten, statt
			// Standing, 69 und orale Positionen auf denselben Wert zu kappen.
			score = math.Min(score, 0.10+0.40*set.Position)
		}

		return ratingClamp01(score)
	}

	score =
		0.54*set.Body +
			0.28*set.Clothing +
			0.16*set.Object +
			0.02*set.Person

	if set.HasBody && set.HasClothing {
		score += 0.05
	}
	if set.HasBody && set.HasObject {
		score += 0.04
	}
	if set.HasClothing && set.HasObject {
		score += 0.03
	}
	if set.HasPerson && (set.HasBody || set.HasObject || set.HasClothing) {
		score += 0.015
	}

	if set.HasClothing && !set.HasBody && !set.HasObject {
		score = math.Min(score, 0.38)
	}

	score = math.Min(score, 0.72)

	return ratingClamp01(score)
}

func segmentSeverityWeight(label string) float64 {
	label = strings.ToLower(strings.TrimSpace(label))
	if label == "" {
		return 0
	}

	if strings.HasPrefix(label, "combo:") {
		return comboSegmentSeverityWeight(label)
	}

	normalized := normalizeRatingSignalLabel(label)
	if normalized == "" {
		return 0
	}

	set := ratingSignalSetFromLabel(normalized)
	sev := contextualSegmentSeverityWeightFromSet(set)
	if sev > 0 {
		return sev
	}

	raw := normalizeSegmentLabel(normalized)
	if raw == "" {
		return 0
	}

	return detectorSeverityWeight(raw)
}

func ratingSegmentSeverity(label string) float64 {
	return segmentSeverityWeight(label)
}

func ratingSignalPriority(label string) int {
	label = normalizeRatingSignalLabel(label)

	switch {
	case strings.HasPrefix(label, "position:"):
		return 100
	case strings.HasPrefix(label, "body:"):
		return 80
	case strings.HasPrefix(label, "object:"):
		return 60
	case strings.HasPrefix(label, "clothing:"):
		return 40
	case strings.HasPrefix(label, "person:"):
		return 20
	default:
		return 0
	}
}

func buildRatingComboLabel(labels map[string]bool) string {
	if len(labels) == 0 {
		return ""
	}

	parts := make([]string, 0, len(labels))
	set := ratingSignalSet{}

	for label := range labels {
		normalized := normalizeRatingSignalLabel(label)
		if normalized == "" {
			continue
		}

		ratingSignalSetAddLabel(&set, normalized)
		parts = append(parts, normalized)
	}

	if !ratingSignalSetHasInterestingContent(set) {
		return ""
	}

	sort.SliceStable(parts, func(i, j int) bool {
		pi := ratingSignalPriority(parts[i])
		pj := ratingSignalPriority(parts[j])

		if pi != pj {
			return pi > pj
		}

		wi := ratingSegmentSeverity(parts[i])
		wj := ratingSegmentSeverity(parts[j])

		if wi != wj {
			return wi > wj
		}

		return parts[i] < parts[j]
	})

	deduped := make([]string, 0, len(parts))
	seen := map[string]bool{}

	for _, part := range parts {
		if part == "" || seen[part] {
			continue
		}
		seen[part] = true
		deduped = append(deduped, part)
	}

	if len(deduped) == 0 {
		return ""
	}

	if len(deduped) == 1 {
		// Person alleine wird oben schon verhindert.
		return deduped[0]
	}

	return "combo:" + strings.Join(deduped, "+")
}

func addRatingLabelsFromSegment(labels map[string]bool, label string) {
	label = strings.ToLower(strings.TrimSpace(label))
	if label == "" {
		return
	}

	if strings.HasPrefix(label, "combo:") {
		raw := strings.TrimPrefix(label, "combo:")
		for _, part := range strings.Split(raw, "+") {
			addRatingLabelsFromSegment(labels, part)
		}
		return
	}

	normalized := normalizeRatingSignalLabel(label)
	if normalized == "" {
		return
	}

	labels[normalized] = true
}

func updateBestExplicitRatingRanks(
	label string,
	bestPosition *string,
	bestPositionRank *int,
	bestClothing *string,
	bestClothingRank *int,
) {
	labels := map[string]bool{}
	addRatingLabelsFromSegment(labels, label)

	for normalized := range labels {
		switch {
		case strings.HasPrefix(normalized, "position:"):
			raw := strings.TrimPrefix(normalized, "position:")
			ranked := positionExplicitRatingRank(raw)
			if ranked.Rank > 0 && (*bestPositionRank == 0 || ranked.Rank < *bestPositionRank) {
				*bestPosition = raw
				*bestPositionRank = ranked.Rank
			}

		case strings.HasPrefix(normalized, "clothing:"):
			raw := strings.TrimPrefix(normalized, "clothing:")
			ranked := clothingExplicitRatingRank(raw)
			if ranked.Rank > 0 && (*bestClothingRank == 0 || ranked.Rank < *bestClothingRank) {
				*bestClothing = raw
				*bestClothingRank = ranked.Rank
			}
		}
	}
}

func ratingSignalSetFromLabels(labels map[string]bool) ratingSignalSet {
	var set ratingSignalSet

	for label := range labels {
		ratingSignalSetAddLabel(&set, label)
	}

	return set
}

func ratingBridgeStrengthFromSet(set ratingSignalSet) float64 {
	strength := 0.0

	if set.HasPosition && set.Position > strength {
		strength = set.Position
	}
	if set.HasBody && set.Body > strength {
		strength = set.Body
	}
	if set.HasObject && set.Object > strength {
		strength = set.Object
	}
	if set.HasClothing && set.Clothing > strength {
		strength = set.Clothing
	}

	return strength
}

func ratingPositionSetFromLabels(labels map[string]bool) map[string]bool {
	out := map[string]bool{}

	for label := range labels {
		normalized := normalizeRatingSignalLabel(label)
		if strings.HasPrefix(normalized, "position:") {
			out[normalized] = true
		}
	}

	return out
}

func ratingPositionSetsConflict(a map[string]bool, b map[string]bool) bool {
	ap := ratingPositionSetFromLabels(a)
	bp := ratingPositionSetFromLabels(b)

	if len(ap) == 0 || len(bp) == 0 {
		return false
	}

	for label := range ap {
		if bp[label] {
			return false
		}
	}

	return true
}

func ratingLabelsBridgeCompatible(a map[string]bool, b map[string]bool) bool {
	if ratingPositionSetsConflict(a, b) {
		return false
	}

	for la := range a {
		na := normalizeRatingSignalLabel(la)
		if na == "" {
			continue
		}

		for lb := range b {
			nb := normalizeRatingSignalLabel(lb)
			if nb == "" {
				continue
			}

			if na == nb {
				return true
			}
		}
	}

	as := ratingSignalSetFromLabels(a)
	bs := ratingSignalSetFromLabels(b)

	// Wichtig:
	// Unterschiedliche Positionen NICHT pauschal verbinden.
	// Vorher hat "Doggy" + "Reverse Cowgirl" als kompatibel gegolten,
	// nur weil beide irgendeine Position waren.

	if as.HasBody && bs.HasBody {
		return true
	}
	if as.HasObject && bs.HasObject {
		return true
	}
	if as.HasClothing && bs.HasClothing {
		return true
	}

	return false
}

func mergeRatingActivitySegments(
	segments []aiSegmentMeta,
	maxSilentGapSec float64,
	minDurationSec float64,
) []aiSegmentMeta {
	if len(segments) == 0 {
		return nil
	}

	valid := make([]aiSegmentMeta, 0, len(segments))

	for _, s := range segments {
		if strings.TrimSpace(s.Label) == "" {
			continue
		}

		start := s.StartSeconds
		end := s.EndSeconds

		if end <= start && s.DurationSeconds > 0 {
			end = start + s.DurationSeconds
		}
		if end <= start {
			continue
		}

		labels := map[string]bool{}
		addRatingLabelsFromSegment(labels, s.Label)

		if buildRatingComboLabel(labels) == "" {
			continue
		}

		s.StartSeconds = start
		s.EndSeconds = end
		s.DurationSeconds = end - start

		if ratingSegmentSeverity(s.Label) <= 0 {
			continue
		}

		valid = append(valid, s)
	}

	if len(valid) == 0 {
		return nil
	}

	sort.SliceStable(valid, func(i, j int) bool {
		if valid[i].StartSeconds != valid[j].StartSeconds {
			return valid[i].StartSeconds < valid[j].StartSeconds
		}
		if valid[i].EndSeconds != valid[j].EndSeconds {
			return valid[i].EndSeconds < valid[j].EndSeconds
		}
		return valid[i].Label < valid[j].Label
	})

	type segmentBounds struct {
		start float64
		end   float64
		ok    bool
	}

	type activityBlock struct {
		start           float64
		end             float64
		scoreSum        float64
		scoreWeight     float64
		labels          map[string]bool
		positionWeights map[string]float64
		positionBounds  map[string]segmentBounds
		positionRanges  map[string][]segmentBounds
		marker          float64
		markerWeight    float64
	}

	var addRatingPositionSignal func(
		weights map[string]float64,
		bounds map[string]segmentBounds,
		ranges map[string][]segmentBounds,
		label string,
		weight float64,
		start float64,
		end float64,
	)

	addRatingPositionSignal = func(
		weights map[string]float64,
		bounds map[string]segmentBounds,
		ranges map[string][]segmentBounds,
		label string,
		weight float64,
		start float64,
		end float64,
	) {
		label = strings.ToLower(strings.TrimSpace(label))
		if label == "" {
			return
		}

		if strings.HasPrefix(label, "combo:") {
			raw := strings.TrimPrefix(label, "combo:")
			for _, part := range strings.Split(raw, "+") {
				addRatingPositionSignal(weights, bounds, ranges, part, weight, start, end)
			}
			return
		}

		normalized := normalizeRatingSignalLabel(label)
		if !strings.HasPrefix(normalized, "position:") {
			return
		}

		if end < start {
			end = start
		}

		weights[normalized] += weight

		b := bounds[normalized]
		if !b.ok {
			b = segmentBounds{
				start: start,
				end:   end,
				ok:    true,
			}
		} else {
			if start < b.start {
				b.start = start
			}
			if end > b.end {
				b.end = end
			}
		}

		bounds[normalized] = b
		if end > start {
			ranges[normalized] = append(ranges[normalized], segmentBounds{
				start: start,
				end:   end,
				ok:    true,
			})
		}
	}

	effectiveRatingLabelsForBlock := func(
		labels map[string]bool,
		positionWeights map[string]float64,
	) (map[string]bool, string) {
		out := map[string]bool{}

		bestPosition := ""
		bestWeight := -1.0

		for label := range labels {
			normalized := normalizeRatingSignalLabel(label)
			if normalized == "" {
				continue
			}

			if strings.HasPrefix(normalized, "position:") {
				w := positionWeights[normalized]
				if w <= 0 {
					w = ratingSegmentSeverity(normalized)
				}

				if w > bestWeight {
					bestWeight = w
					bestPosition = normalized
				}

				continue
			}

			out[normalized] = true
		}

		if bestPosition != "" {
			out[bestPosition] = true
		}

		return out, bestPosition
	}

	segmentMarker := func(s aiSegmentMeta) float64 {
		if s.PreviewSeconds > 0 {
			return s.PreviewSeconds
		}
		if s.MarkerSeconds > 0 {
			return s.MarkerSeconds
		}
		if s.EndSeconds > s.StartSeconds {
			return (s.StartSeconds + s.EndSeconds) / 2
		}
		return s.StartSeconds
	}

	segmentMarkerWeight := func(s aiSegmentMeta) float64 {
		conf := ratingClamp01(s.Score)
		if conf <= 0 {
			conf = 0.50
		}

		sev := ratingSegmentSeverity(s.Label)
		if sev <= 0 {
			sev = 0.50
		}

		return conf * sev
	}

	newBlock := func(s aiSegmentMeta) activityBlock {
		labels := map[string]bool{}
		addRatingLabelsFromSegment(labels, s.Label)

		dur := s.EndSeconds - s.StartSeconds
		conf := ratingClamp01(s.Score)
		if conf <= 0 {
			conf = 0.50
		}

		positionWeights := map[string]float64{}
		positionBounds := map[string]segmentBounds{}
		positionRanges := map[string][]segmentBounds{}

		addRatingPositionSignal(
			positionWeights,
			positionBounds,
			positionRanges,
			s.Label,
			conf*math.Max(1, dur),
			s.StartSeconds,
			s.EndSeconds,
		)

		marker := segmentMarker(s)
		markerWeight := segmentMarkerWeight(s)

		return activityBlock{
			start:           s.StartSeconds,
			end:             s.EndSeconds,
			scoreSum:        conf * dur,
			scoreWeight:     dur,
			labels:          labels,
			positionWeights: positionWeights,
			positionBounds:  positionBounds,
			positionRanges:  positionRanges,
			marker:          marker,
			markerWeight:    markerWeight,
		}
	}

	coveredDuration := func(ranges []segmentBounds, start, end float64) float64 {
		if len(ranges) == 0 || end <= start {
			return 0
		}

		clipped := make([]segmentBounds, 0, len(ranges))
		for _, r := range ranges {
			rangeStart := math.Max(start, r.start)
			rangeEnd := math.Min(end, r.end)
			if rangeEnd > rangeStart {
				clipped = append(clipped, segmentBounds{
					start: rangeStart,
					end:   rangeEnd,
					ok:    true,
				})
			}
		}
		if len(clipped) == 0 {
			return 0
		}

		sort.SliceStable(clipped, func(i, j int) bool {
			if clipped[i].start != clipped[j].start {
				return clipped[i].start < clipped[j].start
			}
			return clipped[i].end < clipped[j].end
		})

		total := 0.0
		currentStart := clipped[0].start
		currentEnd := clipped[0].end

		for _, r := range clipped[1:] {
			if r.start <= currentEnd {
				if r.end > currentEnd {
					currentEnd = r.end
				}
				continue
			}

			total += currentEnd - currentStart
			currentStart = r.start
			currentEnd = r.end
		}

		return total + currentEnd - currentStart
	}

	finishBlock := func(b activityBlock) (aiSegmentMeta, bool) {
		dur := b.end - b.start
		if dur <= 0 {
			return aiSegmentMeta{}, false
		}

		effectiveLabels, bestPosition := effectiveRatingLabelsForBlock(b.labels, b.positionWeights)
		label := buildRatingComboLabel(effectiveLabels)
		if label == "" {
			return aiSegmentMeta{}, false
		}

		sev := ratingSegmentSeverity(label)

		start := b.start
		end := b.end

		// Wenn der finale Block eine Position trägt, soll der Block
		// wirklich auf die echte Positions-Zeit gekürzt werden —
		// nicht nur am Anfang, sondern auch am Ende.
		if bestPosition != "" {
			if bounds, ok := b.positionBounds[bestPosition]; ok && bounds.ok {
				if bounds.start > start {
					start = bounds.start
				}
				if bounds.end < end {
					end = bounds.end
				}
			}
		}

		if end < start {
			end = start
		}

		dur = end - start
		if dur <= 0 {
			return aiSegmentMeta{}, false
		}

		ratingDuration := dur
		if bestPosition != "" {
			if evidenceDuration := coveredDuration(
				b.positionRanges[bestPosition],
				start,
				end,
			); evidenceDuration > 0 {
				ratingDuration = evidenceDuration
			}
		}

		// Kurze Segmente dürfen bleiben, wenn sie stark genug sind.
		if ratingDuration < minDurationSec && sev < 0.72 {
			return aiSegmentMeta{}, false
		}

		score := 0.0
		if b.scoreWeight > 0 {
			score = b.scoreSum / b.scoreWeight
		}
		if score <= 0 {
			score = 0.50
		}

		marker := b.marker
		if marker < start || marker > end {
			marker = (start + end) / 2
		}

		return aiSegmentMeta{
			Label:           label,
			Score:           ratingClamp01(score),
			RatingIntensity: ratingClamp01(sev * ratingConfidenceWeight(score)),
			StartSeconds:    start,
			EndSeconds:      end,
			DurationSeconds: ratingDuration,
			AutoSelected:    true,
			Position:        segmentPositionFromAnalyzeLabel(label),
			Tags:            segmentTagsFromAnalyzeLabel(label),
			MarkerSeconds:   marker,
			PreviewSeconds:  marker,
		}, true
	}

	out := make([]aiSegmentMeta, 0, len(valid))
	cur := newBlock(valid[0])

	for i := 1; i < len(valid); i++ {
		n := valid[i]

		gap := n.StartSeconds - cur.end
		nextLabels := map[string]bool{}
		addRatingLabelsFromSegment(nextLabels, n.Label)
		positionConflict := ratingPositionSetsConflict(cur.labels, nextLabels)

		// A short gap may connect supporting signals or the same position, but
		// must not turn consecutive different positions into one long segment.
		shouldBridge := gap <= maxSilentGapSec && !positionConflict

		if !shouldBridge && !positionConflict && gap <= ratingBridgeStrongGapSec {
			curSet := ratingSignalSetFromLabels(cur.labels)
			nextSet := ratingSignalSetFromLabels(nextLabels)

			curBridgeStrength := ratingBridgeStrengthFromSet(curSet)
			nextBridgeStrength := ratingBridgeStrengthFromSet(nextSet)

			curDur := cur.end - cur.start
			nextDur := n.EndSeconds - n.StartSeconds

			shouldBridge =
				ratingLabelsBridgeCompatible(cur.labels, nextLabels) &&
					curBridgeStrength >= 0.65 &&
					nextBridgeStrength >= 0.65 &&
					(curDur >= 8 || nextDur >= 8)
		}

		if !shouldBridge {
			if finished, ok := finishBlock(cur); ok {
				out = append(out, finished)
			}

			cur = newBlock(n)
			continue
		}

		if n.StartSeconds < cur.start {
			cur.start = n.StartSeconds
		}
		if n.EndSeconds > cur.end {
			cur.end = n.EndSeconds
		}

		dur := n.EndSeconds - n.StartSeconds
		if dur > 0 {
			conf := ratingClamp01(n.Score)
			if conf <= 0 {
				conf = 0.50
			}

			cur.scoreSum += conf * dur
			cur.scoreWeight += dur

			addRatingPositionSignal(
				cur.positionWeights,
				cur.positionBounds,
				cur.positionRanges,
				n.Label,
				conf*math.Max(1, dur),
				n.StartSeconds,
				n.EndSeconds,
			)
		}

		nextMarkerWeight := segmentMarkerWeight(n)
		if nextMarkerWeight > cur.markerWeight {
			cur.markerWeight = nextMarkerWeight
			cur.marker = segmentMarker(n)
		}

		addRatingLabelsFromSegment(cur.labels, n.Label)
	}

	if finished, ok := finishBlock(cur); ok {
		out = append(out, finished)
	}

	return out
}

func prepareAIRatingSegments(segments []aiSegmentMeta) []aiSegmentMeta {
	return mergeRatingActivitySegments(
		segments,
		ratingMaxSilentGapSec,
		ratingMinSegmentDurationSec,
	)
}

func ratingConfidenceWeight(conf float64) float64 {
	conf = ratingClamp01(conf)

	// Confidence soll relevant sein, aber schlechte Scores nicht komplett töten.
	n := ratingSmoothStep((conf - 0.25) / 0.70)

	return 0.58 + 0.42*n
}

func ratingLinearGate(value float64, start float64, full float64) float64 {
	if full <= start {
		if value >= full {
			return 1
		}
		return 0
	}

	return ratingClamp01((value - start) / (full - start))
}

type ratingTimeRange struct {
	Start float64
	End   float64
}

func ratingCoveredSeconds(ranges []ratingTimeRange, durationSec float64) float64 {
	if len(ranges) == 0 || durationSec <= 0 {
		return 0
	}

	valid := make([]ratingTimeRange, 0, len(ranges))
	for _, item := range ranges {
		start := math.Max(0, math.Min(item.Start, durationSec))
		end := math.Max(0, math.Min(item.End, durationSec))
		if end > start {
			valid = append(valid, ratingTimeRange{Start: start, End: end})
		}
	}
	if len(valid) == 0 {
		return 0
	}

	sort.SliceStable(valid, func(i, j int) bool {
		if valid[i].Start != valid[j].Start {
			return valid[i].Start < valid[j].Start
		}
		return valid[i].End < valid[j].End
	})

	total := 0.0
	current := valid[0]

	for _, item := range valid[1:] {
		if item.Start <= current.End {
			if item.End > current.End {
				current.End = item.End
			}
			continue
		}

		total += current.End - current.Start
		current = item
	}

	return total + current.End - current.Start
}

func ratingStrengthComponent(avgConfidence, peakConfidence float64) float64 {
	avg := ratingSmoothStep(ratingLinearGate(avgConfidence, 0.35, 0.90))
	peak := ratingSmoothStep(ratingLinearGate(peakConfidence, 0.50, 0.95))
	return ratingClamp01(0.75*avg + 0.25*peak)
}

func ratingDurationComponent(totalSeconds, longestSeconds float64) float64 {
	total := ratingSaturatingEvidence(totalSeconds, 55.0)
	longest := ratingSaturatingEvidence(longestSeconds, 30.0)
	return ratingClamp01(0.62*total + 0.38*longest)
}

func ratingCoverageComponent(coveredSeconds, durationSec float64) float64 {
	if coveredSeconds <= 0 || durationSec <= 0 {
		return 0
	}
	return ratingSaturatingEvidence(ratingClamp01(coveredSeconds/durationSec), 0.12)
}

func ratingActionComponent(duration, coverage, strength float64) float64 {
	return ratingClamp01(0.50*duration + 0.30*coverage + 0.20*strength)
}

func ratingApplyPositionEvidenceCaps(
	raw float64,
	positionSeconds float64,
	longestSeconds float64,
	avgConfidence float64,
	positionScore float64,
) float64 {
	switch {
	case positionSeconds < 5:
		raw = math.Min(raw, 0.21)
	case positionSeconds < 12:
		raw = math.Min(raw, 0.44)
	case positionSeconds < 30:
		raw = math.Min(raw, 0.67)
	}

	if positionSeconds < 75 ||
		longestSeconds < 18 ||
		avgConfidence < 0.55 ||
		positionScore < 0.65 {
		raw = math.Min(raw, 0.84)
	}
	if avgConfidence < 0.50 && positionScore < 0.65 {
		raw = math.Min(raw, 0.21)
	}

	return ratingClamp01(raw)
}

func starsFromHighlightScore(score float64) int {
	switch {
	case score < 22:
		return 1
	case score < 45:
		return 2
	case score < 68:
		return 3
	case score < 85:
		return 4
	default:
		return 5
	}
}

func ratingUsernameFromVideoPath(videoPath string) string {
	id := strings.TrimSpace(assetIDFromVideoPath(videoPath))
	if id == "" {
		return ""
	}

	user := strings.ToLower(strings.TrimSpace(modelNameFromFilename(id)))
	if user != "" && user != "unknown" {
		return user
	}

	// Fallback nur, wenn die ID nicht wie ein kompletter Dateiname mit Timestamp aussieht.
	if !strings.Contains(id, "__") {
		return strings.ToLower(strings.TrimSpace(id))
	}

	return ""
}

func ratingLogSubject(username string) string {
	username = strings.ToLower(strings.TrimSpace(username))
	if username == "" || username == "unknown" {
		return "[rating]"
	}

	return "[" + username + "]"
}

func computeHighlightRating(segments []aiSegmentMeta, durationSec float64) *aiRatingMeta {
	return computeHighlightRatingWithUsername(segments, durationSec, "")
}

func computeHighlightRatingForVideo(segments []aiSegmentMeta, durationSec float64, videoPath string) *aiRatingMeta {
	return computeHighlightRatingWithUsername(segments, durationSec, ratingUsernameFromVideoPath(videoPath))
}

func computeHighlightRatingWithUsername(segments []aiSegmentMeta, durationSec float64, username string) *aiRatingMeta {
	r := &aiRatingMeta{
		Score: 0,
		Stars: 1,
	}

	if durationSec <= 0 || len(segments) == 0 {
		return r
	}

	videoMinutes := math.Max(durationSec/60.0, 0.25)

	var positionRanges []ratingTimeRange
	var positionWeighted float64
	var positionExplicitSum float64
	var positionEvidenceWeight float64
	var peakPositionExplicitness float64
	var peakPositionConfidence float64

	var contextRanges []ratingTimeRange
	var contextWeighted float64
	var contextExplicitSum float64
	var contextEvidenceWeight float64
	var peakContextExplicitness float64
	var peakContextConfidence float64
	var contextLongest float64
	var contextConfSum float64
	var contextConfWeightSum float64
	var contextN int

	var bodyEffectiveWeighted float64
	var clothingEffectiveWeighted float64
	var objectEffectiveWeighted float64
	var clothingExplicitSum float64
	var clothingEvidenceWeight float64

	var longest float64
	var confSum float64
	var confWeightSum float64
	var n int
	uniquePositions := map[string]bool{}
	bestPosition := ""
	bestPositionRank := 0
	bestClothing := ""
	bestClothingRank := 0

	for _, s := range segments {
		segDur := s.DurationSeconds
		if segDur <= 0 {
			segDur = s.EndSeconds - s.StartSeconds
		}
		if segDur <= 0 {
			continue
		}

		sev := ratingSegmentSeverity(s.Label)
		if sev <= 0 {
			appLogf("🧪 [rating] skip zero severity label=%q normalized=%q", s.Label, normalizeRatingSignalLabel(s.Label))
			continue
		}

		conf := ratingClamp01(s.Score)
		if conf <= 0 {
			conf = 0.50
		}

		confWeight := ratingConfidenceWeight(conf)
		quality := sev * confWeight

		if quality <= 0 {
			continue
		}

		effectiveDur := ratingEffectiveDurationSeconds(segDur)
		weightedDur := segDur * quality
		segmentRange := ratingTimeRange{
			Start: s.StartSeconds,
			End:   s.StartSeconds + segDur,
		}

		set := ratingSignalSetFromLabel(s.Label)
		updateBestExplicitRatingRanks(
			s.Label,
			&bestPosition,
			&bestPositionRank,
			&bestClothing,
			&bestClothingRank,
		)
		bodyEffectiveWeighted += effectiveDur * set.Body * confWeight
		clothingEffectiveWeighted += effectiveDur * set.Clothing * confWeight
		objectEffectiveWeighted += effectiveDur * set.Object * confWeight
		if set.HasClothing {
			clothingExplicitSum += (set.Clothing / clothingExplicitRatingRank("lingerie").Weight) * effectiveDur
			clothingEvidenceWeight += effectiveDur
		}

		if !set.HasPosition {
			contextRanges = append(contextRanges, segmentRange)
			contextWeighted += weightedDur
			contextExplicitSum += sev * effectiveDur
			contextEvidenceWeight += effectiveDur
			contextConfSum += conf * effectiveDur
			contextConfWeightSum += effectiveDur
			contextN++

			if sev > peakContextExplicitness {
				peakContextExplicitness = sev
			}
			if conf > peakContextConfidence {
				peakContextConfidence = conf
			}
			if segDur > contextLongest {
				contextLongest = segDur
			}

			continue
		}

		positionRanges = append(positionRanges, segmentRange)
		positionWeighted += weightedDur
		positionExplicitSum += set.Position * effectiveDur
		positionEvidenceWeight += effectiveDur

		if set.Position > peakPositionExplicitness {
			peakPositionExplicitness = set.Position
		}
		if conf > peakPositionConfidence {
			peakPositionConfidence = conf
		}

		confSum += conf * effectiveDur
		confWeightSum += effectiveDur
		n++

		if segDur > longest {
			longest = segDur
		}

		labels := map[string]bool{}
		addRatingLabelsFromSegment(labels, s.Label)
		for position := range ratingPositionSetFromLabels(labels) {
			uniquePositions[position] = true
		}
	}

	clothingScore := 0.0
	if clothingEvidenceWeight > 0 {
		avgClothingExplicitness := ratingClamp01(clothingExplicitSum / clothingEvidenceWeight)
		clothingDensity := clothingEffectiveWeighted / videoMinutes
		clothingScore = ratingClamp01(
			0.70*avgClothingExplicitness +
				0.30*ratingSaturatingEvidence(clothingDensity, 1.8),
		)
	}

	bodyContext := ratingSaturatingEvidence(bodyEffectiveWeighted/videoMinutes, 1.8)
	objectContext := ratingSaturatingEvidence(objectEffectiveWeighted/videoMinutes, 2.2)
	contextScore := ratingClamp01(0.78*bodyContext + 0.22*objectContext)

	if n == 0 {
		if contextN == 0 {
			appLogf("⚠️ %s rating result is zero because all segments were skipped", ratingLogSubject(username))
			return r
		}

		contextFlagged := ratingCoveredSeconds(contextRanges, durationSec)
		contextCoverageRatio := ratingClamp01(contextFlagged / durationSec)
		contextWeightedCoverageRatio := ratingClamp01(contextWeighted / durationSec)
		contextSegmentsPerMinute := float64(contextN) / videoMinutes
		contextAvgConfidence := contextConfSum / contextConfWeightSum
		avgContextExplicitness := contextExplicitSum / contextEvidenceWeight
		contextQuality := ratingClamp01(
			(0.75*avgContextExplicitness + 0.25*peakContextExplicitness) / 0.72,
		)
		durationScore := ratingDurationComponent(contextFlagged, contextLongest)
		strengthScore := ratingStrengthComponent(contextAvgConfidence, peakContextConfidence)
		coverageScore := ratingCoverageComponent(contextFlagged, durationSec)

		raw :=
			0.30*contextQuality +
				0.25*durationScore +
				0.15*strengthScore +
				0.12*coverageScore +
				0.12*clothingScore +
				0.06*contextScore

		actionRaw := ratingActionComponent(durationScore, coverageScore, strengthScore)

		if contextFlagged < 20.0 {
			raw = math.Min(raw, 0.44)
		}
		semanticCeiling := 0.52 + 0.12*math.Max(
			contextQuality,
			math.Max(clothingScore, contextScore),
		)
		raw = math.Min(raw, semanticCeiling)

		score := ratingRound(ratingClamp01(raw)*100, 1)

		r.Score = score
		r.ActionScore = ratingRound(actionRaw*100, 1)
		r.BestPosition = bestPosition
		r.BestPositionRank = bestPositionRank
		r.BestClothing = bestClothing
		r.BestClothingRank = bestClothingRank
		r.ClothingScore = ratingRound(clothingScore*100, 1)
		r.DurationScore = ratingRound(durationScore*100, 1)
		r.StrengthScore = ratingRound(strengthScore*100, 1)
		r.CoverageScore = ratingRound(coverageScore*100, 1)
		r.ContextScore = ratingRound(contextScore*100, 1)
		r.Stars = starsFromHighlightScore(score)
		r.Segments = contextN
		r.SegmentsPerMinute = ratingRound(contextSegmentsPerMinute, 2)
		r.FlaggedSeconds = ratingRound(contextFlagged, 2)
		r.WeightedFlaggedSeconds = ratingRound(contextWeighted, 2)
		r.CoverageRatio = ratingRound(contextCoverageRatio, 4)
		r.WeightedCoverageRatio = ratingRound(contextWeightedCoverageRatio, 4)
		r.LongestSegmentSeconds = ratingRound(contextLongest, 2)
		r.AvgConfidence = ratingRound(contextAvgConfidence, 3)

		appLogf(
			"rating %s context score=%.1f stars=%d segs=%d flagged=%.1f quality=%.2f coverage=%.4f longest=%.1f avgConf=%.3f",
			ratingLogSubject(username),
			r.Score,
			r.Stars,
			r.Segments,
			r.FlaggedSeconds,
			contextQuality,
			r.WeightedCoverageRatio,
			r.LongestSegmentSeconds,
			r.AvgConfidence,
		)

		return r
	}

	positionFlagged := ratingCoveredSeconds(positionRanges, durationSec)
	coverageRatio := ratingClamp01(positionFlagged / durationSec)
	weightedCoverageRatio := ratingClamp01(positionWeighted / durationSec)
	segmentsPerMinute := float64(n) / videoMinutes
	avgConfidence := confSum / confWeightSum
	avgPositionExplicitness := positionExplicitSum / positionEvidenceWeight
	positionScore := ratingClamp01(
		0.75*avgPositionExplicitness + 0.25*peakPositionExplicitness,
	)
	durationScore := ratingDurationComponent(positionFlagged, longest)
	strengthScore := ratingStrengthComponent(avgConfidence, peakPositionConfidence)
	coverageScore := ratingCoverageComponent(positionFlagged, durationSec)
	varietyScore := ratingLinearGate(float64(len(uniquePositions)), 1, 4)

	raw :=
		0.36*positionScore +
			0.27*durationScore +
			0.14*strengthScore +
			0.10*coverageScore +
			0.06*contextScore +
			0.04*clothingScore +
			0.03*varietyScore

	actionRaw := ratingActionComponent(durationScore, coverageScore, strengthScore)

	// Short or weak detections cannot reach high ratings on rank alone.
	raw = ratingApplyPositionEvidenceCaps(
		raw,
		positionFlagged,
		longest,
		avgConfidence,
		positionScore,
	)

	score := ratingRound(raw*100, 1)

	r.Score = score
	r.ActionScore = ratingRound(actionRaw*100, 1)
	r.BestPosition = bestPosition
	r.BestPositionRank = bestPositionRank
	r.BestClothing = bestClothing
	r.BestClothingRank = bestClothingRank
	r.PositionScore = ratingRound(positionScore*100, 1)
	r.ClothingScore = ratingRound(clothingScore*100, 1)
	r.DurationScore = ratingRound(durationScore*100, 1)
	r.StrengthScore = ratingRound(strengthScore*100, 1)
	r.CoverageScore = ratingRound(coverageScore*100, 1)
	r.ContextScore = ratingRound(contextScore*100, 1)
	r.VarietyScore = ratingRound(varietyScore*100, 1)
	r.Stars = starsFromHighlightScore(score)
	r.Segments = n
	r.SegmentsPerMinute = ratingRound(segmentsPerMinute, 2)
	r.FlaggedSeconds = ratingRound(positionFlagged, 2)
	r.WeightedFlaggedSeconds = ratingRound(positionWeighted, 2)
	r.CoverageRatio = ratingRound(coverageRatio, 4)
	r.WeightedCoverageRatio = ratingRound(weightedCoverageRatio, 4)
	r.LongestSegmentSeconds = ratingRound(longest, 2)
	r.AvgConfidence = ratingRound(avgConfidence, 3)

	appLogf(
		"rating %s score=%.1f stars=%d position=%.1f clothing=%.1f segs=%d flagged=%.1f duration=%.1f strength=%.1f coverage=%.4f longest=%.1f avgConf=%.3f",
		ratingLogSubject(username),
		r.Score,
		r.Stars,
		r.PositionScore,
		r.ClothingScore,
		r.Segments,
		r.FlaggedSeconds,
		r.DurationScore,
		r.StrengthScore,
		r.WeightedCoverageRatio,
		r.LongestSegmentSeconds,
		r.AvgConfidence,
	)

	return r
}