add pick vgf strategy

proto/greenfield/virtualgroup/common.proto

@@ -10,4 +10,7 @@ enum PickVGFStrategy {
   option (gogoproto.goproto_enum_prefix) = false;
 
   Strategy_Maximize_Free_Store_Size = 0;
+  Strategy_Minimal_Free_Store_Size = 1;
+  Strategy_Oldest_Create_Time = 2;
+  Strategy_Recentest_Create_Time = 3;
 }

swagger/static/swagger.yaml

@@ -6585,6 +6585,9 @@ paths:
           type: string
           enum:
             - Strategy_Maximize_Free_Store_Size
+            - Strategy_Minimal_Free_Store_Size
+            - Strategy_Oldest_Create_Time
+            - Strategy_Recentest_Create_Time
           default: Strategy_Maximize_Free_Store_Size
       tags:
         - Query
@@ -37383,6 +37386,9 @@ definitions:
     type: string
     enum:
       - Strategy_Maximize_Free_Store_Size
+      - Strategy_Minimal_Free_Store_Size
+      - Strategy_Oldest_Create_Time
+      - Strategy_Recentest_Create_Time
     default: Strategy_Maximize_Free_Store_Size
     title: >-
       PickVGFStrategy represents the method for selecting the best global

x/virtualgroup/keeper/grpc_query.go

@@ -4,11 +4,12 @@ import (
 	"context"
 	"math"
 
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+
 	"github.com/cosmos/cosmos-sdk/store/prefix"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/query"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 
 	"github.com/bnb-chain/greenfield/x/virtualgroup/types"
 )
@@ -230,6 +231,30 @@ func (k Keeper) QuerySpOptimalGlobalVirtualGroupFamily(goCtx context.Context, re
 				}
 			}
 		}
+	case types.Strategy_Minimal_Free_Store_Size:
+		for _, gvgfID := range stats.GlobalVirtualGroupFamilyIds {
+			gvgFamily, found := k.GetGVGFamily(ctx, gvgfID)
+			if !found {
+				return nil, types.ErrGVGFamilyNotExist
+			}
+			totalStakingSize, stored, err := k.GetGlobalVirtualFamilyTotalStakingAndStoredSize(ctx, gvgFamily)
+			if err != nil {
+				return nil, err
+			}
+			currentFreeStoreSize = math.Min(float64(totalStakingSize), float64(k.MaxStoreSizePerFamily(ctx))) - float64(stored)
+			if currentFreeStoreSize < freeStoreSize {
+				familyID = gvgFamily.Id
+				freeStoreSize = currentFreeStoreSize
+			}
+		}
+	case types.Strategy_Oldest_Create_Time:
+		if len(stats.GlobalVirtualGroupFamilyIds) != 0 {
+			familyID = stats.GlobalVirtualGroupFamilyIds[0]
+		}
+	case types.Strategy_Recentest_Create_Time:
+		if len(stats.GlobalVirtualGroupFamilyIds) != 0 {
+			familyID = stats.GlobalVirtualGroupFamilyIds[len(stats.GlobalVirtualGroupFamilyIds)-1]
+		}
 	default:
 		return nil, status.Error(codes.InvalidArgument, "invalid pick vgf strategy")
 	}