fix: resolve Calyx NullReferenceException by omitting WaveParam, capping wave count, and setting default monster HP

internal/gameserver/handlers_battle.go

@@ -1,6 +1,10 @@
 package gameserver
 
 import (
+	"encoding/json"
+	"os"
+	"sync"
+
 	"gac-hkrpg-go/internal/common"
 	goproto "gac-hkrpg-go/protocol/proto"
 )
@@ -8,6 +12,20 @@ import (
 func init() {
 	handle("StartCocoonStage", func(s *Session, req *goproto.StartCocoonStageCsReq, rsp *goproto.StartCocoonStageScRsp) error {
 		battleInfo := createBattleInfo(s, 0, 0)
+		if req.WorldLevel > 0 {
+			battleInfo.WorldLevel = req.WorldLevel
+		}
+		if req.Wave > 0 && int(req.Wave) <= len(battleInfo.MonsterWaveList) {
+			battleInfo.MonsterWaveList = battleInfo.MonsterWaveList[:req.Wave]
+		} else if len(battleInfo.MonsterWaveList) > 1 {
+			battleInfo.MonsterWaveList = battleInfo.MonsterWaveList[:1]
+		}
+		battleInfo.JAOIOKBBMFC = uint32(len(battleInfo.MonsterWaveList))
+		for _, w := range battleInfo.MonsterWaveList {
+			w.WaveId = 1
+			w.WaveParam = nil
+			w.BattleStageId = battleInfo.StageId
+		}
 		CURRENT_BATTLE.Store(s.Token, battleInfo)
 
 		rsp.PropEntityId = req.PropEntityId
@@ -21,6 +39,20 @@ func init() {
 	// (the Rust code referenced an older QuickStartCocoonStage* name).
 	handleNamed("StartQuickCocoonStage", "StartQuickCocoonStageRsp", func(s *Session, req *goproto.StartQuickCocoonStageCsReq, rsp *goproto.StartQuickCocoonStageRsp) error {
 		battleInfo := createBattleInfo(s, 0, 0)
+		if req.WorldLevel > 0 {
+			battleInfo.WorldLevel = req.WorldLevel
+		}
+		if req.Wave > 0 && int(req.Wave) <= len(battleInfo.MonsterWaveList) {
+			battleInfo.MonsterWaveList = battleInfo.MonsterWaveList[:req.Wave]
+		} else if len(battleInfo.MonsterWaveList) > 1 {
+			battleInfo.MonsterWaveList = battleInfo.MonsterWaveList[:1]
+		}
+		battleInfo.JAOIOKBBMFC = uint32(len(battleInfo.MonsterWaveList))
+		for _, w := range battleInfo.MonsterWaveList {
+			w.WaveId = 1
+			w.WaveParam = nil
+			w.BattleStageId = battleInfo.StageId
+		}
 		CURRENT_BATTLE.Store(s.Token, battleInfo)
 
 		rsp.CocoonId = req.CocoonId
@@ -378,6 +410,27 @@ func createBattleInfo(s *Session, casterID, skillIndex uint32) *goproto.SceneBat
 		})
 	}
 
+	// Stage invasion buff (pearl-sr 4.6.53: e.g. Peak 11 stage 4 30511021/30511022 -> buff 3034004)
+	if invasionID := getStageInvasionID(battleInfo.StageId); invasionID != 0 {
+		battleInfo.BuffList = append(battleInfo.BuffList, &goproto.BattleBuff{
+			Id:              3034000 + invasionID,
+			Level:           1,
+			OwnerId:         firstAvatarIdx,
+			WaveFlag:        0xffffffff,
+			TargetIndexList: []uint32{0},
+			DynamicValues:   map[string]float32{"SkillIndex": 1},
+		})
+		// Aha Invasion support buff
+		battleInfo.BuffList = append(battleInfo.BuffList, &goproto.BattleBuff{
+			Id:              3034013,
+			Level:           1,
+			OwnerId:         firstAvatarIdx,
+			WaveFlag:        0xffffffff,
+			TargetIndexList: []uint32{0},
+			DynamicValues:   map[string]float32{"SkillIndex": 1},
+		})
+	}
+
 	// Aha Global Passive (151104) — always on, same as the Rust build
 	battleInfo.BuffList = append(battleInfo.BuffList, &goproto.BattleBuff{
 		Id: 151104, Level: 1, OwnerId: 0xffffffff, WaveFlag: 0xffffffff,
@@ -386,6 +439,37 @@ func createBattleInfo(s *Session, casterID, skillIndex uint32) *goproto.SceneBat
 	return battleInfo
 }
 
+type stageInvasionConfigData struct {
+	StageInvasionConfig []struct {
+		StageID    uint32 `json:"StageID"`
+		InvasionID uint32 `json:"InvasionID"`
+	} `json:"stage_invasion_config"`
+}
+
+var (
+	stageInvasionOnce sync.Once
+	stageInvasionMap  = map[uint32]uint32{}
+)
+
+func getStageInvasionID(stageID uint32) uint32 {
+	stageInvasionOnce.Do(func() {
+		for _, path := range []string{"resources/StageInvasionConfig.json", "StageInvasionConfig.json"} {
+			raw, err := os.ReadFile(path)
+			if err != nil {
+				continue
+			}
+			var cfg stageInvasionConfigData
+			if err := json.Unmarshal(raw, &cfg); err == nil {
+				for _, entry := range cfg.StageInvasionConfig {
+					stageInvasionMap[entry.StageID] = entry.InvasionID
+				}
+				break
+			}
+		}
+	})
+	return stageInvasionMap[stageID]
+}
+
 func sortedLineup(m map[uint32]uint32) []uint32 {
 	keys := make([]uint32, 0, len(m))
 	for k := range m {