feat: 添加段位保护，添加失败排名保护。

app/user_center/rpc/etc/user_center-dev.yaml

@@ -99,8 +99,10 @@ Coin:
 Grade:
   BravePointCost: [0,300,320,350,400,450,500,600,800,1000]
   MaxBravePoint: 3000
-  WinScoreThreshold: 32
-  MinUserCount: 8
+  WinScoreThreshold: 18
+  MinUserCount: 4
+  ProtectedGradeThreshold: 2
+  ProtectedGradeLost: 1
 Elite:
   LiveDict: { "1": "0", "2": "1001", "3": "1002", "4": "1003" }
   DefaultId: 0

app/user_center/rpc/internal/common/grade/manager.go

@@ -116,7 +116,8 @@ func (m *Manager) reportItem(ctx context.Context, tx *gorm.DB, item ReportReq, w
 			model.DefaultUserGradeLevel,
 			model.DefaultUserGradeStar,
 			0,
-			item.Score)
+			item.Score,
+			item.Position)
 		dbModel.Grade = int64(grade.Grade)
 		dbModel.Level = int64(grade.Level)
 		dbModel.Star = int64(grade.Star)
@@ -142,7 +143,8 @@ func (m *Manager) reportItem(ctx context.Context, tx *gorm.DB, item ReportReq, w
 		dbModel.Level,
 		dbModel.Star,
 		dbModel.BravePoint,
-		item.Score)
+		item.Score,
+		item.Position)
 	dbModel.Grade = int64(grade.Grade)
 	dbModel.Level = int64(grade.Level)
 	dbModel.Star = int64(grade.Star)
@@ -164,7 +166,7 @@ func (m *Manager) reportItem(ctx context.Context, tx *gorm.DB, item ReportReq, w
 	return resp, nil
 }
 
-func (m *Manager) calcRank(win bool, userCountSatisfied bool, grade, level, star, bravePoint int64, score float32) (g pb.Grade, result pb.StatPvPReportResp_GradeResult, reason pb.StatPvPReportResp_GradeReason) {
+func (m *Manager) calcRank(win bool, userCountSatisfied bool, grade, level, star, bravePoint int64, score float32, position int32) (g pb.Grade, result pb.StatPvPReportResp_GradeResult, reason pb.StatPvPReportResp_GradeReason) {
 	g.Grade = int32(grade)
 	g.Level = int32(level)
 	g.Star = int32(star)
@@ -208,6 +210,26 @@ func (m *Manager) calcRank(win bool, userCountSatisfied bool, grade, level, star
 			}
 		}
 	} else {
+		// 大段位保护
+		if grade <= m.config.Grade.ProtectedGradeThreshold {
+			g.Grade = int32(grade)
+			g.Level = int32(level)
+			g.Star = int32(star)
+			g.BravePoint = bravePoint
+			reason = pb.StatPvPReportResp_Lost
+			result = pb.StatPvPReportResp_Keep
+			return
+		}
+		// 名次保护
+		if position <= m.config.Grade.ProtectedGradeLost {
+			g.Grade = int32(grade)
+			g.Level = int32(level)
+			g.Star = int32(star)
+			g.BravePoint = bravePoint
+			reason = pb.StatPvPReportResp_Lost
+			result = pb.StatPvPReportResp_Keep
+			return
+		}
 		// 段位的骁勇分减扣规则
 		bravePointCost := m.config.Grade.BravePointCost[grade]
 		if bravePoint >= bravePointCost {

app/user_center/rpc/internal/config/config_game.go

@@ -105,6 +105,8 @@ type (
 			MaxBravePoint           int64   // 最大骁勇分
 			WinScoreThreshold       float32 // 获胜升段分数阈值
 			MinUserCount            int     // 最小段位计算用户量
+			ProtectedGradeThreshold int64   // 保护段位阈值（大段位）
+			ProtectedGradeLost      int32   // 保护段位（失败方）名次
 		}
 		// 精英单位
 		Elite Elite