Add consumable item sell functionality

server/internal/service/consumableitem.go

@@ -0,0 +1,75 @@
+package service
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	pb "lunar-tear/server/gen/proto"
+	"lunar-tear/server/internal/masterdata"
+	"lunar-tear/server/internal/store"
+	"lunar-tear/server/internal/userdata"
+)
+
+type ConsumableItemServiceServer struct {
+	pb.UnimplementedConsumableItemServiceServer
+	users    store.UserRepository
+	sessions store.SessionRepository
+	catalog  *masterdata.ConsumableItemCatalog
+	config   *masterdata.GameConfig
+}
+
+func NewConsumableItemServiceServer(users store.UserRepository, sessions store.SessionRepository, catalog *masterdata.ConsumableItemCatalog, config *masterdata.GameConfig) *ConsumableItemServiceServer {
+	return &ConsumableItemServiceServer{users: users, sessions: sessions, catalog: catalog, config: config}
+}
+
+func (s *ConsumableItemServiceServer) Sell(ctx context.Context, req *pb.ConsumableItemSellRequest) (*pb.ConsumableItemSellResponse, error) {
+	log.Printf("[ConsumableItemService] Sell: %d item(s)", len(req.ConsumableItemPossession))
+
+	userId := currentUserId(ctx, s.users, s.sessions)
+
+	oldUser, _ := s.users.SnapshotUser(userId)
+	tracker := userdata.NewDeleteTracker().
+		Track("IUserConsumableItem", oldUser, userdata.SortedConsumableItemRecords, []string{"userId", "consumableItemId"})
+
+	snapshot, err := s.users.UpdateUser(userId, func(user *store.UserState) {
+		totalGold := int32(0)
+		for _, item := range req.ConsumableItemPossession {
+			row, ok := s.catalog.All[item.ConsumableItemId]
+			if !ok {
+				log.Printf("[ConsumableItemService] Sell: unknown consumableItemId=%d, skipping", item.ConsumableItemId)
+				continue
+			}
+
+			cur := user.ConsumableItems[item.ConsumableItemId]
+			if cur < item.Count {
+				log.Printf("[ConsumableItemService] Sell: insufficient consumableItemId=%d have=%d need=%d", item.ConsumableItemId, cur, item.Count)
+				continue
+			}
+
+			user.ConsumableItems[item.ConsumableItemId] -= item.Count
+			if user.ConsumableItems[item.ConsumableItemId] <= 0 {
+				delete(user.ConsumableItems, item.ConsumableItemId)
+			}
+
+			gold := row.SellPrice * item.Count
+			totalGold += gold
+			log.Printf("[ConsumableItemService] Sell: consumableItemId=%d x%d -> %d gold", item.ConsumableItemId, item.Count, gold)
+		}
+
+		if totalGold > 0 {
+			user.ConsumableItems[s.config.ConsumableItemIdForGold] += totalGold
+			log.Printf("[ConsumableItemService] Sell: total gold +%d", totalGold)
+		}
+	})
+	if err != nil {
+		return nil, fmt.Errorf("consumable item sell: %w", err)
+	}
+
+	tables := userdata.SelectTables(userdata.FullClientTableMap(snapshot), []string{"IUserConsumableItem"})
+	diff := tracker.Apply(snapshot, tables)
+
+	return &pb.ConsumableItemSellResponse{
+		DiffUserData: diff,
+	}, nil
+}