Support Card Affix

GameServer/Game/Support/SupportAffixService.cs

@@ -0,0 +1,40 @@
+using MikuSB.Data;
+
+namespace MikuSB.GameServer.Game.Support;
+
+public static class SupportAffixService
+{
+    // Returns (affixId, tier) - both 1-based. Returns (0,0) if pool not found.
+    public static (uint AffixId, uint Tier) GenerateRandomAffix(int poolId)
+    {
+        if (!GameData.SupportAffixPoolData.TryGetValue(poolId, out var pool))
+            return (0, 0);
+
+        var groups = pool.Groups.ToList();
+        if (groups.Count == 0)
+            return (0, 0);
+
+        var totalWeight = groups.Sum(x => x.Weight);
+        var roll = Random.Shared.Next(totalWeight);
+        var cumulative = 0;
+        var selectedAffixs = groups[0].Affixs;
+
+        foreach (var (affixIds, weight) in groups)
+        {
+            cumulative += weight;
+            if (roll < cumulative)
+            {
+                selectedAffixs = affixIds;
+                break;
+            }
+        }
+
+        if (selectedAffixs.Count == 0)
+            return (0, 0);
+
+        var affixId = selectedAffixs[Random.Shared.Next(selectedAffixs.Count)];
+        var tierCount = GameData.SupportAffixData.GetValueOrDefault(affixId)?.TierCount ?? 5;
+        var tier = (uint)(Random.Shared.Next(tierCount) + 1);
+        return ((uint)affixId, tier);
+    }
+}