feat: improve scoring with multi-token AND and phrase match bonus

BrowserSearch/Main.cs

@@ -267,17 +267,40 @@ public List<Result> Query(Query query)
         private int CalculateScore(string query, string title, string url)
         {
             // Since PT Run's FuzzySearch is too slow, and the history usually has a lot of entries,
-            // lets calculate the scores manually using a faster (but less accurate) method
-            float titleScore = title.Contains(query, StringComparison.InvariantCultureIgnoreCase)
-                ? (query.Length / (float)title.Length * 100f)
-                : 0;
-            float urlScore = url.Contains(query, StringComparison.InvariantCultureIgnoreCase)
-                ? (query.Length / (float)url.Length * 100f)
-                : 0;
+            // lets calculate the scores manually using a faster (but less accurate) method.
+            // Multi-token: every whitespace-separated token must appear in title or url (AND).
+            string[] tokens = query.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+            if (tokens.Length == 0)
+            {
+                return 0;
+            }
 
-            float score = new[] { titleScore, urlScore }.Max();
-            score += _defaultBrowser!.CalculateExtraScore(query, title, url);
+            float score = 0;
+            foreach (string token in tokens)
+            {
+                bool inTitle = title.Contains(token, StringComparison.InvariantCultureIgnoreCase);
+                bool inUrl = url.Contains(token, StringComparison.InvariantCultureIgnoreCase);
+                if (!inTitle && !inUrl)
+                {
+                    return 0;
+                }
+
+                float titleContrib = inTitle ? token.Length / (float)title.Length * 100f : 0f;
+                float urlContrib = inUrl ? token.Length / (float)url.Length * 100f : 0f;
+                score += Math.Max(titleContrib, urlContrib);
+            }
 
+            // Bonus when the whole query appears contiguously, so phrase matches still outrank scattered tokens
+            if (title.Contains(query, StringComparison.InvariantCultureIgnoreCase))
+            {
+                score += query.Length / (float)title.Length * 100f;
+            }
+            else if (url.Contains(query, StringComparison.InvariantCultureIgnoreCase))
+            {
+                score += query.Length / (float)url.Length * 100f;
+            }
+
+            score += _defaultBrowser!.CalculateExtraScore(query, title, url);
             return (int)score;
         }
     }