Implement Tower accumulation reward claiming

server/internal/service/quest_tower.go

@@ -0,0 +1,49 @@
+package service
+
+import (
+	"context"
+	"log"
+
+	pb "lunar-tear/server/gen/proto"
+	"lunar-tear/server/internal/gametime"
+	"lunar-tear/server/internal/model"
+	"lunar-tear/server/internal/store"
+)
+
+func (s *QuestServiceServer) ReceiveTowerAccumulationReward(ctx context.Context, req *pb.ReceiveTowerAccumulationRewardRequest) (*pb.ReceiveTowerAccumulationRewardResponse, error) {
+	log.Printf("[QuestService] ReceiveTowerAccumulationReward: eventQuestChapterId=%d targetMissionClearCount=%d",
+		req.EventQuestChapterId, req.TargetMissionClearCount)
+
+	cat := s.holder.Get()
+	tower := cat.Tower
+	granter := cat.QuestHandler.Granter
+
+	userId := CurrentUserId(ctx, s.users, s.sessions)
+	nowMillis := gametime.NowMillis()
+
+	s.users.UpdateUser(userId, func(user *store.UserState) {
+		rec := user.TowerAccumulationRewards[req.EventQuestChapterId]
+		old := rec.LatestRewardReceiveQuestMissionClearCount
+
+		items, highest := tower.CollectRewards(req.EventQuestChapterId, old, req.TargetMissionClearCount)
+		if highest <= old {
+			log.Printf("[QuestService] ReceiveTowerAccumulationReward: nothing to grant for chapter=%d (claimed=%d, target=%d)",
+				req.EventQuestChapterId, old, req.TargetMissionClearCount)
+			return
+		}
+
+		for _, it := range items {
+			granter.GrantFull(user, model.PossessionType(it.PossessionType), it.PossessionId, it.Count, nowMillis)
+		}
+
+		rec.EventQuestChapterId = req.EventQuestChapterId
+		rec.LatestRewardReceiveQuestMissionClearCount = highest
+		rec.LatestVersion = nowMillis
+		user.TowerAccumulationRewards[req.EventQuestChapterId] = rec
+
+		log.Printf("[QuestService] ReceiveTowerAccumulationReward: chapter=%d granted %d item(s), claimed %d -> %d",
+			req.EventQuestChapterId, len(items), old, highest)
+	})
+
+	return &pb.ReceiveTowerAccumulationRewardResponse{}, nil
+}