Energy: Particle/Orb Drops from Monsters (#1054)

* Generate energy drops for monsters + make sure picking up particles honors their count.

* Use drop info from excels instead.

* Remove double newline.

* Remove commented code.

src/main/java/emu/grasscutter/Grasscutter.java

@@ -6,6 +6,7 @@ import java.util.Calendar;
 import emu.grasscutter.auth.AuthenticationSystem;
 import emu.grasscutter.auth.DefaultAuthentication;
 import emu.grasscutter.command.CommandMap;
+import emu.grasscutter.game.managers.EnergyManager.EnergyManager;
 import emu.grasscutter.game.managers.StaminaManager.StaminaManager;
 import emu.grasscutter.plugin.PluginManager;
 import emu.grasscutter.plugin.api.ServerHook;
@@ -106,6 +107,7 @@ public final class Grasscutter {
 		Grasscutter.updateDayOfWeek();
 		ResourceLoader.loadAll();
 		ScriptLoader.init();
+		EnergyManager.initialize();
 	
 		// Initialize database.
 		DatabaseManager.initialize();

src/main/java/emu/grasscutter/game/entity/EntityMonster.java

@@ -5,6 +5,7 @@ import emu.grasscutter.data.common.PropGrowCurve;
 import emu.grasscutter.data.def.MonsterCurveData;
 import emu.grasscutter.data.def.MonsterData;
 import emu.grasscutter.game.dungeons.DungeonChallenge;
+import emu.grasscutter.game.player.Player;
 import emu.grasscutter.game.props.EntityIdType;
 import emu.grasscutter.game.props.FightProperty;
 import emu.grasscutter.game.props.PlayerProperty;
@@ -111,6 +112,23 @@ public class EntityMonster extends GameEntity {
 		this.poseId = poseId;
 	}
 
+	@Override
+	public void damage(float amount, int killerId) {
+		// Get HP before damage.
+		float hpBeforeDamage = this.getFightProperty(FightProperty.FIGHT_PROP_CUR_HP);
+
+		// Apply damage.
+		super.damage(amount, killerId);
+
+		// Get HP after damage.
+		float hpAfterDamage = this.getFightProperty(FightProperty.FIGHT_PROP_CUR_HP);
+
+		// Invoke energy drop logic.
+		for (Player player : this.getScene().getPlayers()) {
+			player.getEnergyManager().handleMonsterEnergyDrop(this, hpBeforeDamage, hpAfterDamage);
+		}
+	}
+
 	@Override
 	public void onDeath(int killerId) {
 		if (this.getSpawnEntry() != null) {

src/main/java/emu/grasscutter/game/managers/EnergyManager/EnergyDropEntry.java

@@ -0,0 +1,16 @@
+package emu.grasscutter.game.managers.EnergyManager;
+
+import java.util.List;
+
+public class EnergyDropEntry {
+    private int dropId;
+    private List<EnergyDropInfo> dropList;
+
+    public int getDropId() {
+        return this.dropId;
+    }
+
+    public List<EnergyDropInfo> getDropList() {
+        return this.dropList;
+    }
+}

src/main/java/emu/grasscutter/game/managers/EnergyManager/EnergyDropInfo.java

@@ -0,0 +1,14 @@
+package emu.grasscutter.game.managers.EnergyManager;
+
+public class EnergyDropInfo {
+    private int ballId;
+    private int count;
+
+    public int getBallId() {
+        return this.ballId;
+    }
+
+    public int getCount() {
+        return this.count;
+    }
+}

src/main/java/emu/grasscutter/game/managers/EnergyManager/EnergyManager.java

@@ -1,30 +1,43 @@
-package emu.grasscutter.game.managers;
+package emu.grasscutter.game.managers.EnergyManager;
 
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.data.DataLoader;
 import emu.grasscutter.data.GameData;
 import emu.grasscutter.data.def.AvatarSkillDepotData;
 import emu.grasscutter.data.def.ItemData;
+import emu.grasscutter.data.def.MonsterData.HpDrops;
 import emu.grasscutter.game.avatar.Avatar;
 import emu.grasscutter.game.entity.EntityAvatar;
 import emu.grasscutter.game.entity.EntityClientGadget;
 import emu.grasscutter.game.entity.EntityItem;
+import emu.grasscutter.game.entity.EntityMonster;
 import emu.grasscutter.game.entity.GameEntity;
 import emu.grasscutter.game.inventory.GameItem;
 import emu.grasscutter.game.player.Player;
 import emu.grasscutter.game.props.ElementType;
+import emu.grasscutter.game.props.FightProperty;
 import emu.grasscutter.net.proto.AbilityActionGenerateElemBallOuterClass.AbilityActionGenerateElemBall;
 import emu.grasscutter.net.proto.AbilityInvokeEntryOuterClass.AbilityInvokeEntry;
 import emu.grasscutter.net.proto.PropChangeReasonOuterClass.PropChangeReason;
 import emu.grasscutter.server.game.GameSession;
 import emu.grasscutter.utils.Position;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 
 import static emu.grasscutter.Configuration.GAME_OPTIONS;
 
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.util.Collection;
+import java.util.List;
 import java.util.Optional;
 
+import com.google.gson.reflect.TypeToken;
 import com.google.protobuf.InvalidProtocolBufferException;
 
 public class EnergyManager {
 	private final Player player;
+    private final static Int2ObjectMap<List<EnergyDropInfo>> energyDropData = new Int2ObjectOpenHashMap<>();
 
 	public EnergyManager(Player player) {
 		this.player = player;
@@ -34,6 +47,22 @@ public class EnergyManager {
 		return this.player;
 	}
 
+	public static void initialize() {
+		// Read the data we need for monster energy drops.
+		try (Reader fileReader = new InputStreamReader(DataLoader.load("EnergyDrop.json"))) {
+            List<EnergyDropEntry> energyDropList = Grasscutter.getGsonFactory().fromJson(fileReader, TypeToken.getParameterized(Collection.class, EnergyDropEntry.class).getType());
+
+			for (EnergyDropEntry entry : energyDropList) {
+				energyDropData.put(entry.getDropId(), entry.getDropList());
+			}
+
+			Grasscutter.getLogger().info("Energy drop data successfully loaded.");
+		}
+		catch (Exception ex) {
+            Grasscutter.getLogger().error("Unable to load energy drop data.", ex);
+		}
+	}
+
 	/**********
 		Particle creation for elemental skills.
 	**********/
@@ -117,17 +146,8 @@ public class EnergyManager {
 		 	}
 		}
 
-		// Get the item data for an energy particle of the correct element.
-		ItemData itemData = GameData.getItemDataMap().get(itemId);
-		if (itemData == null) {
-			return; // Should never happen
-		}
-	
-		// Generate entity.
-		EntityItem energyBall = new EntityItem(getPlayer().getScene(), getPlayer(), itemData, new Position(action.getPos()), 1);
-		energyBall.getRotation().set(action.getRot());
-
-		this.getPlayer().getScene().addEntity(energyBall);
+		// Generate the particle/orb.
+		generateElemBall(itemId, new Position(action.getPos()), 1);
 	}
 
 	/**********
@@ -183,11 +203,10 @@ public class EnergyManager {
 			float elementBonus = (ballElement == null) ? 2.0f : (avatarElement == ballElement) ? 3.0f : 1.0f;
 
 			// Add the energy.
-			entity.addEnergy(baseEnergy * elementBonus * offFieldPenalty, PropChangeReason.PROP_CHANGE_ENERGY_BALL);
+			entity.addEnergy(baseEnergy * elementBonus * offFieldPenalty * elemBall.getCount(), PropChangeReason.PROP_CHANGE_ENERGY_BALL);
 		}
 	}
 
-
 	/**********
 		Energy logic related to using skills.
 	**********/
@@ -218,4 +237,56 @@ public class EnergyManager {
 		// Handle elemental burst.
 		this.handleBurstCast(avatar, skillId);
 	}
+
+	/**********
+		Monster energy drops.
+	**********/
+	private void generateElemBallDrops(EntityMonster monster, int dropId) {
+		// Generate all drops specified for the given drop id.
+		if (!energyDropData.containsKey(dropId)) {
+			Grasscutter.getLogger().warn("No drop data for dropId {} found.", dropId);
+			return;
+		}
+
+		for (EnergyDropInfo info : energyDropData.get(dropId)) {
+			this.generateElemBall(info.getBallId(), monster.getPosition(), info.getCount());
+		}
+	}
+	public void handleMonsterEnergyDrop(EntityMonster monster, float hpBeforeDamage, float hpAfterDamage) {
+		// Calculate the HP tresholds for before and after the damage was taken.
+		float maxHp = monster.getFightProperty(FightProperty.FIGHT_PROP_MAX_HP);
+		float thresholdBefore = hpBeforeDamage / maxHp;
+		float thresholdAfter = hpAfterDamage / maxHp;
+		
+		// Determine the thresholds the monster has passed, and generate drops based on that.
+		for (HpDrops drop : monster.getMonsterData().getHpDrops()) {
+			if (drop.getDropId() == 0) {
+				continue;
+			}
+
+			float threshold = drop.getHpPercent() / 100.0f;
+			if (threshold < thresholdBefore && threshold >= thresholdAfter) {
+				generateElemBallDrops(monster, drop.getDropId());
+			}
+		}
+
+		// Handle kill drops.
+		if (hpAfterDamage <= 0 && monster.getMonsterData().getKillDropId() != 0) {
+			generateElemBallDrops(monster, monster.getMonsterData().getKillDropId());
+		}
+	}
+
+	/**********
+		Utility.
+	**********/
+	private void generateElemBall(int ballId, Position position, int count) {
+		// Generate a particle/orb with the specified parameters.
+		ItemData itemData = GameData.getItemDataMap().get(ballId);
+		if (itemData == null) {
+			return;
+		}
+
+		EntityItem energyBall = new EntityItem(this.getPlayer().getScene(), this.getPlayer(), itemData, position, count);
+		this.getPlayer().getScene().addEntity(energyBall);
+	}
 }

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

@@ -23,8 +23,8 @@ import emu.grasscutter.game.inventory.Inventory;
 import emu.grasscutter.game.mail.Mail;
 import emu.grasscutter.game.mail.MailHandler;
 import emu.grasscutter.game.managers.StaminaManager.StaminaManager;
-import emu.grasscutter.game.managers.EnergyManager;
 import emu.grasscutter.game.managers.SotSManager;
+import emu.grasscutter.game.managers.EnergyManager.EnergyManager;
 import emu.grasscutter.game.props.ActionReason;
 import emu.grasscutter.game.props.EntityType;
 import emu.grasscutter.game.props.PlayerProperty;

src/main/resources/defaults/data/EnergyDrop.json

@@ -0,0 +1,160 @@
+[
+	{
+		"dropId": 22010010,
+		"dropList": [
+			{ "ballId": 2024, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010030,
+		"dropList": [
+			{ "ballId": 2008, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010050,
+		"dropList": [
+			{ "ballId": 2024, "count": 3 },
+			{ "ballId": 2008, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010013,
+		"dropList": [
+			{ "ballId": 2019, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010033,
+		"dropList": [
+			{ "ballId": 2003, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010015,
+		"dropList": [
+			{ "ballId": 2021, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010035,
+		"dropList": [
+			{ "ballId": 2005, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010034,
+		"dropList": [
+			{ "ballId": 2004, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010037,
+		"dropList": [
+			{ "ballId": 2007, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010032,
+		"dropList": [
+			{ "ballId": 2002, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010022,
+		"dropList": [
+			{ "ballId": 2018, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010036,
+		"dropList": [
+			{ "ballId": 2006, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010026,
+		"dropList": [
+			{ "ballId": 2022, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010031,
+		"dropList": [
+			{ "ballId": 2001, "count": 1 }
+		]
+	},
+
+	{
+		"dropId": 22010014,
+		"dropList": [
+			{ "ballId": 2020, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010016,
+		"dropList": [
+			{ "ballId": 2022, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010012,
+		"dropList": [
+			{ "ballId": 2018, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010024,
+		"dropList": [
+			{ "ballId": 2004, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010011,
+		"dropList": [
+			{ "ballId": 2017, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010017,
+		"dropList": [
+			{ "ballId": 2023, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010021,
+		"dropList": [
+			{ "ballId": 2017, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010027,
+		"dropList": [
+			{ "ballId": 2007, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010040,
+		"dropList": [
+			{ "ballId": 2024, "count": 1 },
+			{ "ballId": 2008, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22010025,
+		"dropList": [
+			{ "ballId": 2021, "count": 2 }
+		]
+	},
+	{
+		"dropId": 22010020,
+		"dropList": [
+			{ "ballId": 2024, "count": 1 }
+		]
+	},
+	{
+		"dropId": 22003100,
+		"dropList": [
+		]
+	}
+]