feat: skip existing media in STRM tree generation

internal/service/strm_tree_missing.go

@@ -0,0 +1,73 @@
+package service
+
+import (
+	"context"
+	"errors"
+	"net/url"
+	"strings"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+)
+
+func (s *STRMService) strmTreeExistingCloudRefs(ctx context.Context, opts GenerateSTRMTreeOptions) (map[string]struct{}, error) {
+	if !opts.MissingOnly {
+		return nil, nil
+	}
+	if s == nil || s.repo == nil || s.repo.DB == nil {
+		return nil, errors.New("media library unavailable")
+	}
+	var rows []model.Media
+	if err := s.repo.DB.WithContext(ctx).
+		Select("path", "strm_url").
+		Where("strm_url <> '' OR path LIKE ?", "cloud://%").
+		Find(&rows).Error; err != nil {
+		return nil, err
+	}
+	refs := make(map[string]struct{}, len(rows))
+	for _, row := range rows {
+		if typ, ref, ok := parseCloudMediaPlaybackURL(row.STRMURL); ok {
+			refs[strmTreeCloudRefKey(typ, ref)] = struct{}{}
+		}
+		if typ, ref, ok := strmTreeCloudPathTarget(row.Path); ok {
+			refs[strmTreeCloudRefKey(typ, ref)] = struct{}{}
+		}
+	}
+	return refs, nil
+}
+
+func strmTreeSourceAlreadyInLibrary(source strmTreeSource, opts GenerateSTRMTreeOptions, existingRefs map[string]struct{}) bool {
+	if len(existingRefs) == 0 || source.Provider == "" || source.Path == "" || source.Kind == strmTreeSourceKindSubtitle {
+		return false
+	}
+	ref := strmTreeCloudRef(source.cloudRefPath(), opts.SourceRoot)
+	_, ok := existingRefs[strmTreeCloudRefKey(source.Provider, ref)]
+	return ok
+}
+
+func strmTreeCloudPathTarget(raw string) (string, string, bool) {
+	raw = strings.TrimSpace(raw)
+	if !strings.HasPrefix(strings.ToLower(raw), "cloud://") {
+		return "", "", false
+	}
+	rest := strings.TrimPrefix(raw, "cloud://")
+	parts := strings.SplitN(rest, "/", 2)
+	if len(parts) != 2 {
+		return "", "", false
+	}
+	typ := strings.TrimSpace(parts[0])
+	ref := strings.TrimSpace(parts[1])
+	return typ, ref, typ != "" && ref != ""
+}
+
+func strmTreeCloudRefKey(provider, ref string) string {
+	return strings.ToLower(normalizeSTRMTreeProvider(provider)) + "\x00" + strmTreeNormalizeCloudRef(ref)
+}
+
+func strmTreeNormalizeCloudRef(ref string) string {
+	ref = strings.TrimSpace(ref)
+	if decoded, err := url.PathUnescape(ref); err == nil {
+		ref = decoded
+	}
+	ref = strings.TrimSpace(strings.ReplaceAll(ref, "\\", "/"))
+	return strings.ToLower(strings.TrimLeft(ref, "/"))
+}