refactor(playback): simplify service files

internal/features/playback/service_base.go

@@ -259,12 +259,11 @@ func (s *Service) setPlaybackBaseDataCache(key string, data playbackBaseData) {
 }
 
 func (s *Service) resolveShowCached(ctx context.Context, malID int, titleCandidates []string) (string, string, error) {
-	now := time.Now()
-
 	s.cacheMu.RLock()
 	item, ok := s.showResolution[malID]
 	s.cacheMu.RUnlock()
 
+	now := time.Now()
 	if ok && now.Before(item.ExpiresAt) && strings.TrimSpace(item.ShowID) != "" {
 		return item.ShowID, item.Title, nil
 	}
@@ -278,7 +277,7 @@ func (s *Service) resolveShowCached(ctx context.Context, malID int, titleCandida
 	s.showResolution[malID] = showResolutionCacheItem{
 		ShowID:    showID,
 		Title:     resolvedTitle,
-		ExpiresAt: time.Now().Add(showResolutionCacheTTL),
+		ExpiresAt: now.Add(showResolutionCacheTTL),
 	}
 	s.cacheMu.Unlock()
 
@@ -347,7 +346,6 @@ func cloneStringSlice(items []string) []string {
 	if len(items) == 0 {
 		return nil
 	}
-
 	cloned := make([]string, len(items))
 	copy(cloned, items)
 	return cloned
@@ -357,7 +355,6 @@ func cloneModeSources(modeSources map[string]ModeSource) map[string]ModeSource {
 	if len(modeSources) == 0 {
 		return nil
 	}
-
 	cloned := make(map[string]ModeSource, len(modeSources))
 	for mode, source := range modeSources {
 		cloned[mode] = ModeSource{
@@ -366,7 +363,6 @@ func cloneModeSources(modeSources map[string]ModeSource) map[string]ModeSource {
 			Subtitles: cloneSubtitleItems(source.Subtitles),
 		}
 	}
-
 	return cloned
 }
 
@@ -374,7 +370,6 @@ func cloneSubtitleItems(items []SubtitleItem) []SubtitleItem {
 	if len(items) == 0 {
 		return nil
 	}
-
 	cloned := make([]SubtitleItem, len(items))
 	copy(cloned, items)
 	return cloned
@@ -384,7 +379,6 @@ func cloneSegments(segments []SkipSegment) []SkipSegment {
 	if len(segments) == 0 {
 		return nil
 	}
-
 	cloned := make([]SkipSegment, len(segments))
 	copy(cloned, segments)
 	return cloned

internal/features/playback/service_proxy.go

@@ -49,27 +49,33 @@ func (s *Service) ProxyStream(ctx context.Context, targetURL string, referer str
 }
 
 func isM3U8(targetURL string, contentType string) bool {
-	lowerURL := strings.ToLower(targetURL)
-	lowerType := strings.ToLower(contentType)
-	if strings.Contains(lowerURL, ".m3u8") {
+	if strings.Contains(strings.ToLower(targetURL), ".m3u8") {
 		return true
 	}
-
+	lowerType := strings.ToLower(contentType)
 	return strings.Contains(lowerType, "application/vnd.apple.mpegurl") || strings.Contains(lowerType, "application/x-mpegurl")
 }
 
+var hopHeaders = map[string]struct{}{
+	"connection":          {},
+	"transfer-encoding":   {},
+	"keep-alive":          {},
+	"proxy-authenticate":  {},
+	"proxy-authorization": {},
+	"te":                  {},
+	"trailers":            {},
+	"upgrade":             {},
+}
+
 func cloneHeaders(src http.Header) http.Header {
 	dst := make(http.Header)
 	for key, values := range src {
-		lower := strings.ToLower(key)
-		if lower == "connection" || lower == "transfer-encoding" || lower == "keep-alive" || lower == "proxy-authenticate" || lower == "proxy-authorization" || lower == "te" || lower == "trailers" || lower == "upgrade" {
+		if _, ok := hopHeaders[strings.ToLower(key)]; ok {
 			continue
 		}
-
 		for _, value := range values {
 			dst.Add(key, value)
 		}
 	}
-
 	return dst
 }

internal/features/playback/service_ranking.go

@@ -189,16 +189,12 @@ func extractDigits(value string) string {
 
 func normalizeSourceTypeFromProbe(source StreamSource, contentType string) StreamSource {
 	lower := strings.ToLower(contentType)
-	if strings.Contains(lower, "video/mp4") {
+	switch {
+	case strings.Contains(lower, "video/mp4"):
 		source.Type = "mp4"
-		return source
-	}
-
-	if strings.Contains(lower, "mpegurl") {
+	case strings.Contains(lower, "mpegurl"):
 		source.Type = "m3u8"
-		return source
 	}
-
 	return source
 }
 

internal/features/playback/service_resolution.go

@@ -122,12 +122,7 @@ func firstNonEmptyTitle(values []string) string {
 }
 
 func normalizeMode(raw string) string {
-	lower := strings.ToLower(strings.TrimSpace(raw))
-	if lower == "sub" || lower == "dub" {
-		return lower
-	}
-
-	return lower
+	return strings.ToLower(strings.TrimSpace(raw))
 }
 
 func availableModes(modeSources map[string]ModeSource) []string {

internal/features/playback/service_sources.go

@@ -60,19 +60,16 @@ func (s *Service) choosePlaybackSource(ctx context.Context, ranked []sourceScore
 		return StreamSource{}, "", errors.New("no ranked sources available")
 	}
 
-	embedCandidates := make([]StreamSource, 0)
+	embedCandidates := make([]StreamSource, 0, len(ranked))
 	for _, candidate := range ranked {
 		source := candidate.source
-		sourceType := strings.ToLower(source.Type)
-
-		switch sourceType {
+		switch strings.ToLower(source.Type) {
 		case "mp4", "m3u8":
 			return source, "direct-media", nil
 		case "embed":
 			embedCandidates = append(embedCandidates, source)
 		default:
-			playable, contentType := s.probeDirectMedia(ctx, source)
-			if playable {
+			if playable, contentType := s.probeDirectMedia(ctx, source); playable {
 				return normalizeSourceTypeFromProbe(source, contentType), "probed-media", nil
 			}
 		}
@@ -101,19 +98,16 @@ func (s *Service) choosePlaybackSourceWithCache(
 		return StreamSource{}, "", errors.New("no ranked sources available")
 	}
 
-	embedCandidates := make([]StreamSource, 0)
+	embedCandidates := make([]StreamSource, 0, len(ranked))
 	for _, candidate := range ranked {
 		source := candidate.source
-		sourceType := strings.ToLower(source.Type)
-
-		switch sourceType {
+		switch strings.ToLower(source.Type) {
 		case "mp4", "m3u8":
 			return source, "direct-media", nil
 		case "embed":
 			embedCandidates = append(embedCandidates, source)
 		default:
-			playable, contentType := s.probeDirectMediaCached(ctx, source, probeCache, probeCacheMu)
-			if playable {
+			if playable, contentType := s.probeDirectMediaCached(ctx, source, probeCache, probeCacheMu); playable {
 				return normalizeSourceTypeFromProbe(source, contentType), "probed-media", nil
 			}
 		}
@@ -208,10 +202,10 @@ func (s *Service) probeDirectMedia(ctx context.Context, source StreamSource) (bo
 }
 
 func (s *Service) probeEmbedSource(ctx context.Context, source StreamSource) bool {
-	probeCtx, cancel := context.WithTimeout(ctx, providerProbeTimeout)
+	ctx, cancel := context.WithTimeout(ctx, providerProbeTimeout)
 	defer cancel()
 
-	req, err := http.NewRequestWithContext(probeCtx, http.MethodGet, source.URL, nil)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, source.URL, nil)
 	if err != nil {
 		return false
 	}
@@ -237,7 +231,7 @@ func (s *Service) probeEmbedSource(ctx context.Context, source StreamSource) boo
 	}
 
 	content := strings.ToLower(string(body))
-	markers := []string{
+	for _, marker := range []string{
 		"file was deleted",
 		"file has been deleted",
 		"video was deleted",
@@ -246,8 +240,7 @@ func (s *Service) probeEmbedSource(ctx context.Context, source StreamSource) boo
 		"file not found",
 		"this file does not exist",
 		"resource unavailable",
-	}
-	for _, marker := range markers {
+	} {
 		if strings.Contains(content, marker) {
 			return false
 		}