cross mix knockout seeds

src/features/tournaments/utils/group-config.ts

@@ -34,7 +34,10 @@ export function calculateGroupConfigurations(teamCount: number): GroupConfigOpti
     if (remainder > numGroups) continue;
 
     const groupsWithExtra = remainder;
-    const matchesGuaranteed = teamsPerGroup - 1;
+
+    const groupsAtBaseSize = numGroups - groupsWithExtra;
+    const minGroupSize = groupsAtBaseSize > 0 ? teamsPerGroup : teamsPerGroup + 1;
+    const matchesGuaranteed = minGroupSize - 1;
 
     for (let advancePerGroup = 1; advancePerGroup <= Math.min(3, teamsPerGroup - 1); advancePerGroup++) {
       const teamsAdvancing = numGroups * advancePerGroup;
@@ -77,7 +80,24 @@ export function calculateGroupConfigurations(teamCount: number): GroupConfigOpti
     }
   }
 
-  return configs.sort((a, b) => {
+  const uniqueConfigs = new Map<string, GroupConfigOption>();
+
+  for (const config of configs) {
+    const groupSizes: number[] = [];
+    for (let i = 0; i < config.num_groups; i++) {
+      const size = config.teams_per_group + (i < config.groups_with_extra ? 1 : 0);
+      groupSizes.push(size);
+    }
+    groupSizes.sort((a, b) => b - a);
+
+    const key = `${groupSizes.join(',')}_advance${config.advance_per_group}`;
+
+    if (!uniqueConfigs.has(key)) {
+      uniqueConfigs.set(key, config);
+    }
+  }
+
+  return Array.from(uniqueConfigs.values()).sort((a, b) => {
     if (a.matches_guaranteed !== b.matches_guaranteed) {
       return b.matches_guaranteed - a.matches_guaranteed;
     }