Auto-Rename: zwei Mismatch-Bugs gefixt (obfuskierter File-Token + weak Folder)

Bug 1 - Obfuskierter Datei-Token vs Folder:
Hoster verteilen Episoden in EPISODEN-Ordner ABER scrambeln den
Datei-Token zur Anti-Piracy:
  Folder: Die.Thundermans.S02E01.Der.Thunder.Van.GERMAN...
  File:   awa-diethundermans02e16hd.mkv  (Datei sagt E16, Folder E01)

Bisher hat der Episode-Token-Mismatch-Check uebersprungen → Datei
behaelt obfuskierten Namen → MKV-Move kopiert Garbage-Namen ins
Library-Verzeichnis.

Fix: wenn der unmittelbare Eltern-Ordner explizit denselben SxxExx-
Token wie unser computed targetBaseName traegt (also ein Per-Episode
Scene-Folder ist, NICHT der Extract-Root), wird der Folder-Token als
authoritativ behandelt — Scene-Releases benennen Episoden-Folder
deterministisch korrekt, der Datei-Name ist die Obfuskation.

Bug 2 - Weak Folder ueberschreibt perfekten Source-Filename:
Source: Desperate.Housewives.S01E01.German.Synced.DL.720p.WEB-DL.AC3.h264
Folder-Kette: ["S01 Complete", "Desperate.Housewives.S01.Synced..."]

Auto-Rename hat den unmittelbaren Parent "S01 Complete" gewaehlt und
daraus "S01E01 Complete" gebaut — kompletter Verlust des Series-Namens.

Fix: neue Helper-Funktion hasMeaningfulSeriesPrefix() prueft, ob ein
Name mindestens 3 alphabetische Zeichen VOR dem Season-Token hat.
Wenn (a) Source einen Episode-Token hat, (b) Source einen Series-Prefix
hat, (c) Computed Target KEINEN Series-Prefix hat und (d) Target weniger
als die Haelfte der Source-Laenge ist → Source behalten, Rename
ueberspringen. Renaming wuerde Information ZERSTOEREN.

Tests: 3 neue Unit-Tests fuer hasMeaningfulSeriesPrefix decken die
relevanten Faelle ab (echte Series-Namen vs generische Season-Labels
vs. Folder ohne Season-Token). 577/577 Tests gruen.

src/main/download-manager.ts

@@ -851,6 +851,21 @@ const SCENE_EPISODE_JOINED_RE = /s(\d{1,2})e(\d{1,3})(?:e(\d{1,3}))?(?!\d)/i;
 // Scene typo: "S05S01" instead of "S05E01" — second S should be E
 const SCENE_EPISODE_TYPO_SS_RE = /(?:^|[._\-\s])s(\d{1,2})s(\d{1,3})(?!\d)/i;
 const SCENE_SEASON_ONLY_RE = /(^|[._\-\s])s\d{1,2}(?=[._\-\s]|$)/i;
+
+/** True iff the name has at least 3 alphabetic characters BEFORE the first
+ *  SxxExx / Sxx token. Used to distinguish folders/files with a real series
+ *  name ("Desperate.Housewives.S01...") from generic season labels
+ *  ("S01 Complete", "Season 1"). */
+export function hasMeaningfulSeriesPrefix(name: string): boolean {
+  const text = String(name || "");
+  const seasonMatch = text.match(/(?:^|[._\-\s])s\d{1,2}/i);
+  if (!seasonMatch || seasonMatch.index === undefined) {
+    return false;
+  }
+  const prefix = text.slice(0, seasonMatch.index);
+  const alphaChars = (prefix.match(/[A-Za-z]/g) || []).length;
+  return alphaChars >= 3;
+}
 const SCENE_SEASON_CAPTURE_RE = /(?:^|[._\-\s])s(\d{1,2})(?=[._\-\s]|$)/i;
 const SCENE_EPISODE_ONLY_RE = /(?:^|[._\-\s])e(?:p(?:isode)?)?\s*0*(\d{1,3})(?:[._\-\s]|$)/i;
 const SCENE_PART_TOKEN_RE = /(?:^|[._\-\s])(?:teil|part)\s*0*(\d{1,3})(?=[._\-\s]|$)/i;
@@ -3683,6 +3698,39 @@ export class DownloadManager extends EventEmitter {
       let targetBaseName = buildAutoRenameBaseNameFromFoldersWithOptions(folderCandidates, sourceBaseName, {
         forceEpisodeForSeasonFolder: true
       });
+      // Defense against degenerate folder layouts: when the immediate parent
+      // folder lacks a real series name (e.g. "S01 Complete", "Season 1",
+      // "Staffel 02"), buildAutoRenameBaseName can collapse a perfect source
+      // filename like "Desperate.Housewives.S01E01.German.Synced.DL.720p.WEB-
+      // DL.AC3.h264" into garbage like "S01E01 Complete". If the source is
+      // already well-formed (has SxxExx + a meaningful series-name prefix)
+      // and the computed target is much shorter / lacks that prefix, keep
+      // the source as-is — renaming would actively destroy information.
+      if (targetBaseName && sourceBaseName.length > 0) {
+        const sourceHasEpisode = Boolean(extractEpisodeToken(sourceBaseName));
+        const targetHasEpisode = Boolean(extractEpisodeToken(targetBaseName));
+        const sourceHasSeriesPrefix = hasMeaningfulSeriesPrefix(sourceBaseName);
+        const targetHasSeriesPrefix = hasMeaningfulSeriesPrefix(targetBaseName);
+        const targetIsMuchShorter = targetBaseName.length * 2 < sourceBaseName.length;
+        if (sourceHasEpisode
+          && targetHasEpisode
+          && sourceHasSeriesPrefix
+          && !targetHasSeriesPrefix
+          && targetIsMuchShorter) {
+          logger.info(`Auto-Rename uebersprungen: Source "${sourceBaseName}" ist bereits aussagekraeftiger als computed Target "${targetBaseName}"`);
+          if (pkg) {
+            const resolved = resolveRenameItem();
+            this.logRenameProcess(pkg, "INFO", "auto-rename", "Auto-Rename uebersprungen: Source schon besser als computed Target", {
+              sourcePath,
+              sourceName,
+              sourceBaseName,
+              targetBaseName,
+              folders: folderCandidates.join(", ")
+            }, resolved.item, resolved.matchedBy);
+          }
+          continue;
+        }
+      }
       const resolveRenameItem = (...extra: Array<string | null | undefined>): { item: DownloadItem | null; matchedBy: string | null } => {
         if (!pkg) {
           return { item: null, matchedBy: null };
@@ -3727,20 +3775,51 @@ export class DownloadManager extends EventEmitter {
             }
           }
         } else if (targetEpisodeToken !== sourceEpisodeToken) {
-          // Target has a DIFFERENT episode token than source — that's a clear sign
+          // Target has a DIFFERENT episode token than source. Normally that's a
-          // the rename is wrong (would mislabel the episode). Skip to be safe.
+          // sign the rename would mislabel the episode — BUT scene releases
-          logger.warn(`Auto-Rename Safety: Skipping rename - Episode-Token Mismatch (source=${sourceEpisodeToken}, target=${targetEpisodeToken})`);
+          // often place obfuscated MKVs (e.g. "awa-diethundermans02e16hd.mkv"
-          if (pkg) {
+          // = scrambled E16) inside an explicitly named episode folder
-            const resolved = resolveRenameItem();
+          // (e.g. "Die.Thundermans.S02E01.Der.Thunder.Van.GERMAN.x264-aWake").
-            this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename uebersprungen: Episode-Token Mismatch", {
+          // The folder is created by the release group with the REAL episode
-              sourcePath,
+          // info; the file name is anti-piracy obfuscation. So when the
-              sourceName,
+          // immediate parent folder carries the same explicit SxxExx token as
-              sourceEpisodeToken,
+          // our computed targetBaseName, trust the folder and override the
-              targetEpisodeToken,
+          // misleading source token.
-              targetBaseName
+          const parentFolderName = path.basename(path.dirname(sourcePath));
-            }, resolved.item, resolved.matchedBy);
+          const parentEpisodeToken = extractEpisodeToken(parentFolderName);
+          const folderIsAuthoritative = Boolean(
+            parentEpisodeToken
+            && parentEpisodeToken === targetEpisodeToken
+            && parentFolderName.toLowerCase() !== path.basename(extractDir).toLowerCase()
+          );
+          if (folderIsAuthoritative) {
+            logger.info(`Auto-Rename: source-Token ${sourceEpisodeToken} ignoriert, Folder-Token ${targetEpisodeToken} ist authoritativ (vermutlich obfuskierter Dateiname in ${parentFolderName})`);
+            if (pkg) {
+              const resolved = resolveRenameItem();
+              this.logRenameProcess(pkg, "INFO", "auto-rename", "Auto-Rename: Folder-Token uebersteuert obfuskierten Datei-Token", {
+                sourcePath,
+                sourceName,
+                sourceEpisodeToken,
+                targetEpisodeToken,
+                parentFolder: parentFolderName,
+                targetBaseName
+              }, resolved.item, resolved.matchedBy);
+            }
+            // Fall through to the normal rename path with targetBaseName.
+          } else {
+            logger.warn(`Auto-Rename Safety: Skipping rename - Episode-Token Mismatch (source=${sourceEpisodeToken}, target=${targetEpisodeToken})`);
+            if (pkg) {
+              const resolved = resolveRenameItem();
+              this.logRenameProcess(pkg, "WARN", "auto-rename", "Auto-Rename uebersprungen: Episode-Token Mismatch", {
+                sourcePath,
+                sourceName,
+                sourceEpisodeToken,
+                targetEpisodeToken,
+                targetBaseName
+              }, resolved.item, resolved.matchedBy);
+            }
+            continue;
           }
-          continue;
         }
       }
       if (!targetBaseName) {

tests/auto-rename.test.ts

@@ -6,9 +6,31 @@ import {
   ensureRepackToken,
   buildAutoRenameBaseName,
   buildAutoRenameBaseNameFromFolders,
-  buildAutoRenameBaseNameFromFoldersWithOptions
+  buildAutoRenameBaseNameFromFoldersWithOptions,
+  hasMeaningfulSeriesPrefix
 } from "../src/main/download-manager";
 
+describe("hasMeaningfulSeriesPrefix", () => {
+  it("recognizes a real series name before the season token", () => {
+    expect(hasMeaningfulSeriesPrefix("Desperate.Housewives.S01.Synced.DL.720p.WEB-DL.AC3.h264")).toBe(true);
+    expect(hasMeaningfulSeriesPrefix("Die.Thundermans.S02E06.Tickets.und.Shreddy.GERMAN.WS.720p.HDTV.x264-aWake")).toBe(true);
+    expect(hasMeaningfulSeriesPrefix("Mistresses.2013.S02.GERMAN.DL.720p.WEB.x264-TSCC")).toBe(true);
+    expect(hasMeaningfulSeriesPrefix("show.name.s01e01.720p")).toBe(true);
+  });
+
+  it("rejects generic season-label folders without a series name", () => {
+    expect(hasMeaningfulSeriesPrefix("S01 Complete")).toBe(false);
+    expect(hasMeaningfulSeriesPrefix("S02")).toBe(false);
+    expect(hasMeaningfulSeriesPrefix("S01E01 Complete")).toBe(false);
+    expect(hasMeaningfulSeriesPrefix(".S01.bla")).toBe(false);
+  });
+
+  it("returns false when there is no season token at all", () => {
+    expect(hasMeaningfulSeriesPrefix("Some Random Folder")).toBe(false);
+    expect(hasMeaningfulSeriesPrefix("")).toBe(false);
+  });
+});
+
 describe("extractEpisodeToken", () => {
   it("extracts S01E01 from standard scene format", () => {
     expect(extractEpisodeToken("show.name.s01e01.720p")).toBe("S01E01");