Fix local adult metadata and watch history removal

internal/service/episode_parser.go

@@ -2,10 +2,13 @@
 //
 // Detects season + episode numbers from filenames. Recognised patterns:
 //
-//   S01E02        / s1e2
-//   1x02          / 01x02
-//   EP02 / E02
-//   第2集         / 第02集
+//	S01E02        / s1e2
+//	1x02          / 01x02
+//	EP02 / E02
+//	第2集         / 第02集
+//
+// For bare episode markers such as "EP02", the parser also looks at parent
+// folders like "Season 02" / "S02" / "第2季" before falling back to season 1.
 //
 // When neither a season nor an episode marker is present, returns (0, 0).
 package service
@@ -18,10 +21,11 @@ import (
 )
 
 var (
-	patSEnE = regexp.MustCompile(`(?i)s(\d{1,2})e(\d{1,3})`)
-	patNxE  = regexp.MustCompile(`(\d{1,2})x(\d{1,3})`)
-	patEP   = regexp.MustCompile(`(?i)(?:^|[^a-z])(?:e|ep)\.?\s*(\d{1,3})(?:[^0-9]|$)`)
-	patCN   = regexp.MustCompile(`第\s*(\d{1,3})\s*[集话話]`)
+	patSEnE         = regexp.MustCompile(`(?i)s(\d{1,2})e(\d{1,3})`)
+	patNxE          = regexp.MustCompile(`(\d{1,2})x(\d{1,3})`)
+	patEP           = regexp.MustCompile(`(?i)(?:^|[^a-z])(?:e|ep)\.?\s*(\d{1,3})(?:[^0-9]|$)`)
+	patCN           = regexp.MustCompile(`第\s*(\d{1,3})\s*[集话話期]`)
+	patSeasonFolder = regexp.MustCompile(`(?i)(?:^|[^a-z])(?:s|season)\.?\s*(\d{1,2})(?:[^0-9]|$)|第\s*(\d{1,2})\s*季`)
 )
 
 // ParseEpisode tries to extract (season, episode) from an arbitrary filename.
@@ -40,18 +44,47 @@ func ParseEpisode(path string) (season, episode int) {
 		return
 	}
 	if m := patEP.FindStringSubmatch(name); len(m) >= 2 {
-		season = 1
+		season = seasonFromParents(path)
+		if season == 0 {
+			season = 1
+		}
 		episode = mustAtoi(m[1])
 		return
 	}
 	if m := patCN.FindStringSubmatch(name); len(m) >= 2 {
-		season = 1
+		season = seasonFromParents(path)
+		if season == 0 {
+			season = 1
+		}
 		episode = mustAtoi(m[1])
 		return
 	}
 	return 0, 0
 }
 
+func seasonFromParents(path string) int {
+	dir := filepath.Dir(path)
+	for i := 0; i < 4; i++ {
+		base := filepath.Base(dir)
+		if base == "." || base == string(filepath.Separator) {
+			return 0
+		}
+		if m := patSeasonFolder.FindStringSubmatch(base); len(m) >= 3 {
+			for _, group := range m[1:] {
+				if group != "" {
+					return mustAtoi(group)
+				}
+			}
+		}
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			return 0
+		}
+		dir = parent
+	}
+	return 0
+}
+
 func mustAtoi(s string) int {
 	v, _ := strconv.Atoi(s)
 	return v