feat(match): skip ambiguous subtitle matches via score margin

1 files changed, 6 insertions, 0 deletions

diff --git a/src/lib/Media/Anime/Airing/Subtitled/match.ts b/src/lib/Media/Anime/Airing/Subtitled/match.ts
index dc8dbff9..661d0d23 100644
--- a/src/lib/Media/Anime/Airing/Subtitled/match.ts
+++ b/src/lib/Media/Anime/Airing/Subtitled/match.ts
@@ -67,6 +67,7 @@ const isMeaningfulToken = (token: string): boolean =>
 
 const MIN_MATCH_SCORE = 0.3;
 const MIN_TOKEN_OVERLAP = 2;
+const MIN_MATCH_MARGIN = 0.08;
 
 interface SimilarityAnalysis {
   score: number;
@@ -124,6 +125,7 @@ export const findClosestMatch = (times: Time[], anime: Media): Time | null => {
   }));
   let bestMatch: Time | null = null;
   let bestScore = 0;
+  let secondBestScore = 0;
   let bestTokenOverlap = 0;
   let bestNumericTokenOverlap = 0;
   const searchTitles = [anime.title.romaji, anime.title.english, ...anime.synonyms].filter(Boolean);
@@ -137,15 +139,19 @@ export const findClosestMatch = (times: Time[], anime: Media): Time | null => {
       const similarity = calculateWeightedSimilarity(normalizedSearchTitle, normalized);
 
       if (similarity.score > bestScore) {
+        secondBestScore = bestScore;
         bestScore = similarity.score;
         bestTokenOverlap = similarity.tokenOverlap;
         bestNumericTokenOverlap = similarity.numericTokenOverlap;
         bestMatch = time;
+      } else if (similarity.score > secondBestScore) {
+        secondBestScore = similarity.score;
       }
     }
   }
 
   if (bestScore < MIN_MATCH_SCORE) return null;
+  if (bestScore - secondBestScore < MIN_MATCH_MARGIN) return null;
   if (bestNumericTokenOverlap === 0 && bestTokenOverlap < MIN_TOKEN_OVERLAP) return null;
 
   return bestMatch;