More reliable stamina calculation

by separately handling immediate one-time cost and cost over time.

src/main/java/emu/grasscutter/game/player/Player.java

@@ -1152,7 +1152,7 @@ public class Player {
 
 	public void onLogout() {
 		// stop stamina calculation
-		getMovementManager().resetTimer();
+		getMovementManager().stopSustainedStaminaHandler();
 
 		// force to leave the dungeon
 		if (getScene().getSceneType() == SceneType.SCENE_DUNGEON) {

src/main/java/emu/grasscutter/game/player/TeamManager.java

@@ -557,7 +557,7 @@ public class TeamManager {
 		//		     return;
 		//		}
 		//	}
-		player.getMovementManager().resetTimer(); // prevent drowning immediately after respawn
+		player.getMovementManager().stopSustainedStaminaHandler(); // prevent drowning immediately after respawn
 		
 		// Revive all team members
 		for (EntityAvatar entity : getActiveTeam()) {

src/main/java/emu/grasscutter/server/packet/recv/HandlerCombatInvocationsNotify.java

 package emu.grasscutter.server.packet.recv;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.game.entity.GameEntity;
+import emu.grasscutter.game.props.FightProperty;
 import emu.grasscutter.net.packet.Opcodes;
 import emu.grasscutter.net.packet.PacketOpcodes;
 import emu.grasscutter.net.proto.CombatInvocationsNotifyOuterClass.CombatInvocationsNotify;
@@ -8,11 +10,21 @@ import emu.grasscutter.net.proto.CombatInvokeEntryOuterClass.CombatInvokeEntry;
 import emu.grasscutter.net.proto.EntityMoveInfoOuterClass.EntityMoveInfo;
 import emu.grasscutter.net.proto.EvtBeingHitInfoOuterClass.EvtBeingHitInfo;
 import emu.grasscutter.net.packet.PacketHandler;
+import emu.grasscutter.net.proto.MotionInfoOuterClass.MotionInfo;
+import emu.grasscutter.net.proto.MotionStateOuterClass.MotionState;
+import emu.grasscutter.net.proto.PlayerDieTypeOuterClass;
 import emu.grasscutter.server.game.GameSession;
+import emu.grasscutter.server.packet.send.PacketEntityFightPropUpdateNotify;
+
+import java.util.HashMap;
 
 @Opcodes(PacketOpcodes.CombatInvocationsNotify)
 public class HandlerCombatInvocationsNotify extends PacketHandler {
 
+	private float cachedLandingSpeed = 0;
+	private long cachedLandingTimeMillisecond = 0;
+	private boolean monitorLandingEvent = false;
+
 	@Override
 	public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
 		CombatInvocationsNotify notif = CombatInvocationsNotify.parseFrom(payload);
@@ -28,7 +40,33 @@ public class HandlerCombatInvocationsNotify extends PacketHandler {
 					EntityMoveInfo moveInfo = EntityMoveInfo.parseFrom(entry.getCombatData());
 					GameEntity entity = session.getPlayer().getScene().getEntityById(moveInfo.getEntityId());
 					if (entity != null) {
-						session.getPlayer().getMovementManager().handle(session, moveInfo, entity);
+						// Move player
+						MotionInfo motionInfo = moveInfo.getMotionInfo();
+						entity.getPosition().set(motionInfo.getPos());
+						entity.getRotation().set(motionInfo.getRot());
+						entity.setLastMoveSceneTimeMs(moveInfo.getSceneTime());
+						entity.setLastMoveReliableSeq(moveInfo.getReliableSeq());
+						MotionState motionState = motionInfo.getState();
+						entity.setMotionState(motionState);
+
+						session.getPlayer().getMovementManager().handleCombatInvocationsNotify(session, moveInfo, entity);
+
+						// TODO: handle MOTION_FIGHT landing
+						//  For plunge attacks, LAND_SPEED is always -30 and is not useful.
+						//  May need the height when starting plunge attack.
+
+						if (monitorLandingEvent) {
+ 							if (motionState == MotionState.MOTION_FALL_ON_GROUND) {
+								monitorLandingEvent = false;
+								handleFallOnGround(session, entity, motionState);
+							}
+						}
+						if (motionState == MotionState.MOTION_LAND_SPEED) {
+							// MOTION_LAND_SPEED and MOTION_FALL_ON_GROUND arrive in different packet. Cache land speed for later use.
+							cachedLandingSpeed = motionInfo.getSpeed().getY();
+							cachedLandingTimeMillisecond = System.currentTimeMillis();
+							monitorLandingEvent = true;
+						}
 					}
 					break;
 				default:
@@ -47,5 +85,39 @@ public class HandlerCombatInvocationsNotify extends PacketHandler {
 		}
 	}
 
-
+	private void handleFallOnGround(GameSession session, GameEntity entity, MotionState motionState) {
+		// If not received immediately after MOTION_LAND_SPEED, discard this packet.
+		int maxDelay = 200;
+		long actualDelay = System.currentTimeMillis() - cachedLandingTimeMillisecond;
+		Grasscutter.getLogger().debug("MOTION_FALL_ON_GROUND received after " + actualDelay + "/" + maxDelay + "ms." + (actualDelay > maxDelay ? " Discard" : ""));
+		if (actualDelay > maxDelay) {
+			return;
+		}
+		float currentHP = entity.getFightProperty(FightProperty.FIGHT_PROP_CUR_HP);
+		float maxHP = entity.getFightProperty(FightProperty.FIGHT_PROP_MAX_HP);
+		float damage = 0;
+		if (cachedLandingSpeed < -23.5) {
+			damage = (float) (maxHP * 0.33);
+		}
+		if (cachedLandingSpeed < -25) {
+			damage = (float) (maxHP * 0.5);
+		}
+		if (cachedLandingSpeed < -26.5) {
+			damage = (float) (maxHP * 0.66);
+		}
+		if (cachedLandingSpeed < -28) {
+			damage = (maxHP * 1);
+		}
+		float newHP = currentHP - damage;
+		if (newHP < 0) {
+			newHP = 0;
+		}
+		Grasscutter.getLogger().debug(currentHP + "/" + maxHP + "\t" + "\tDamage: " + damage + "\tnewHP: " + newHP);
+		entity.setFightProperty(FightProperty.FIGHT_PROP_CUR_HP, newHP);
+		entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_CUR_HP));
+		if (newHP == 0) {
+			session.getPlayer().getMovementManager().killAvatar(session, entity, PlayerDieTypeOuterClass.PlayerDieType.PLAYER_DIE_FALL);
+		}
+		cachedLandingSpeed = 0;
+	}
 }

src/main/java/emu/grasscutter/server/packet/recv/HandlerEvtDoSkillSuccNotify.java

 package emu.grasscutter.server.packet.recv;
 
-import emu.grasscutter.Grasscutter;
 import emu.grasscutter.net.packet.Opcodes;
 import emu.grasscutter.net.packet.PacketHandler;
 import emu.grasscutter.net.packet.PacketOpcodes;
@@ -15,10 +14,7 @@ public class HandlerEvtDoSkillSuccNotify extends PacketHandler {
         EvtDoSkillSuccNotify notify = EvtDoSkillSuccNotify.parseFrom(payload);
         // TODO: Will be used for deducting stamina for charged skills.
 
-        int caster = notify.getCasterId();
-        int skillId = notify.getSkillId();
-
-        session.getPlayer().getMovementManager().notifySkill(caster, skillId);
+        session.getPlayer().getMovementManager().handleEvtDoSkillSuccNotify(session, notify);
     }
 
 }