tiebreakers

src/features/tournaments/components/group-stage-view.tsx

@@ -137,43 +137,103 @@ const GroupStageView: React.FC<GroupStageViewProps> = ({
       });
     });
 
-    groupMatches
-      .filter((match) => match.status === "ended")
-      .forEach((match) => {
-        const homeId = match.home?.id;
-        const awayId = match.away?.id;
+    const completedMatches = groupMatches.filter((match) => match.status === "ended");
 
-        if (!homeId || !awayId) return;
+    completedMatches.forEach((match) => {
+      const homeId = match.home?.id;
+      const awayId = match.away?.id;
 
-        const homeStanding = standings.get(homeId);
-        const awayStanding = standings.get(awayId);
+      if (!homeId || !awayId) return;
 
-        if (!homeStanding || !awayStanding) return;
+      const homeStanding = standings.get(homeId);
+      const awayStanding = standings.get(awayId);
 
-        const homeCups = match.home_cups || 0;
-        const awayCups = match.away_cups || 0;
+      if (!homeStanding || !awayStanding) return;
 
-        homeStanding.cupsFor += homeCups;
-        homeStanding.cupsAgainst += awayCups;
-        awayStanding.cupsFor += awayCups;
-        awayStanding.cupsAgainst += homeCups;
+      const homeCups = match.home_cups || 0;
+      const awayCups = match.away_cups || 0;
 
-        homeStanding.cupDifference += homeCups - awayCups;
-        awayStanding.cupDifference += awayCups - homeCups;
+      homeStanding.cupsFor += homeCups;
+      homeStanding.cupsAgainst += awayCups;
+      awayStanding.cupsFor += awayCups;
+      awayStanding.cupsAgainst += homeCups;
 
-        if (homeCups > awayCups) {
-          homeStanding.wins++;
-          awayStanding.losses++;
-        } else if (awayCups > homeCups) {
-          awayStanding.wins++;
-          homeStanding.losses++;
-        }
-      });
+      homeStanding.cupDifference += homeCups - awayCups;
+      awayStanding.cupDifference += awayCups - homeCups;
+
+      if (homeCups > awayCups) {
+        homeStanding.wins++;
+        awayStanding.losses++;
+      } else if (awayCups > homeCups) {
+        awayStanding.wins++;
+        homeStanding.losses++;
+      }
+    });
+
+    const h2hRecords = new Map<string, Map<string, { wins: number; cupDiff: number }>>();
+
+    completedMatches.forEach((match) => {
+      const homeId = match.home?.id;
+      const awayId = match.away?.id;
+
+      if (!homeId || !awayId) return;
+
+      if (!h2hRecords.has(homeId)) {
+        h2hRecords.set(homeId, new Map());
+      }
+      if (!h2hRecords.has(awayId)) {
+        h2hRecords.set(awayId, new Map());
+      }
+
+      const homeH2H = h2hRecords.get(homeId)!;
+      const awayH2H = h2hRecords.get(awayId)!;
+
+      if (!homeH2H.has(awayId)) {
+        homeH2H.set(awayId, { wins: 0, cupDiff: 0 });
+      }
+      if (!awayH2H.has(homeId)) {
+        awayH2H.set(homeId, { wins: 0, cupDiff: 0 });
+      }
+
+      const homeRecord = homeH2H.get(awayId)!;
+      const awayRecord = awayH2H.get(homeId)!;
+
+      const homeCups = match.home_cups || 0;
+      const awayCups = match.away_cups || 0;
+
+      const cupDiff = homeCups - awayCups;
+      homeRecord.cupDiff += cupDiff;
+      awayRecord.cupDiff -= cupDiff;
+
+      if (homeCups > awayCups) {
+        homeRecord.wins++;
+      } else if (awayCups > homeCups) {
+        awayRecord.wins++;
+      }
+    });
 
     return Array.from(standings.values()).sort((a, b) => {
       if (b.wins !== a.wins) return b.wins - a.wins;
+
       if (b.cupDifference !== a.cupDifference) return b.cupDifference - a.cupDifference;
-      return b.cupsFor - a.cupsFor;
+
+      if (b.cupsFor !== a.cupsFor) return b.cupsFor - a.cupsFor;
+
+      const aH2H = h2hRecords.get(a.teamId);
+      const bH2H = h2hRecords.get(b.teamId);
+
+      if (aH2H && bH2H) {
+        const aVsB = aH2H.get(b.teamId);
+        const bVsA = bH2H.get(a.teamId);
+
+        if (aVsB && bVsA) {
+          if (aVsB.wins !== bVsA.wins) return bVsA.wins - aVsB.wins;
+
+          if (aVsB.cupDiff !== -bVsA.cupDiff) return aVsB.cupDiff - (-bVsA.cupDiff);
+        }
+      }
+
+      return a.teamId.localeCompare(b.teamId);
     });
   };