Add low HP notification feature for boats

src/main/java/com/duckblade/osrs/sailing/SailingConfig.java

@@ -269,6 +269,31 @@ default boolean navigationOverlaySpeed()
 		return true;
 	}
 
+	@ConfigItem(
+		keyName = "lowBoatHPNotify",
+		name = "Notify on Low Boat HP",
+		description = "Notify when your boat's hitpoints drop below the threshold.",
+		section = SECTION_NAVIGATION,
+		position = 13
+	)
+	default Notification lowBoatHPNotification()
+	{
+		return Notification.OFF;
+	}
+
+	@ConfigItem(
+		keyName = "lowBoatHPThreshold",
+		name = "Low HP Threshold",
+		description = "The hitpoint threshold at which to notify you.",
+		section = SECTION_NAVIGATION,
+		position = 14
+	)
+	@Range(min = 1)
+	default int lowBoatHPThreshold()
+	{
+		return 50;
+	}
+
 	@ConfigItem(
 		keyName = "highlightTrimmableSails",
 		name = "Highlight Trimmable Sails",

src/main/java/com/duckblade/osrs/sailing/features/navigation/LowHPNotification.java

@@ -0,0 +1,84 @@
+package com.duckblade.osrs.sailing.features.navigation;
+
+import com.duckblade.osrs.sailing.SailingConfig;
+import com.duckblade.osrs.sailing.features.util.SailingUtil;
+import com.duckblade.osrs.sailing.module.PluginLifecycleComponent;
+import javax.inject.Inject;
+import javax.inject.Singleton;
+import lombok.RequiredArgsConstructor;
+import net.runelite.api.Client;
+import net.runelite.api.events.GameTick;
+import net.runelite.api.gameval.VarbitID;
+import net.runelite.client.Notifier;
+import net.runelite.client.config.Notification;
+import net.runelite.client.eventbus.Subscribe;
+
+@Singleton
+@RequiredArgsConstructor(onConstructor_ = @Inject)
+public class LowHPNotification implements PluginLifecycleComponent
+{
+
+	private final Client client;
+	private final Notifier notifier;
+
+	private Notification notification;
+	private int threshold;
+
+	private boolean hasNotified = false;
+
+	@Override
+	public boolean isEnabled(SailingConfig config)
+	{
+		notification = config.lowBoatHPNotification();
+		threshold = config.lowBoatHPThreshold();
+		return notification.isEnabled();
+	}
+
+	@Override
+	public void shutDown()
+	{
+		hasNotified = false;
+	}
+
+	@Subscribe
+	public void onGameTick(GameTick e)
+	{
+		if (!SailingUtil.isSailing(client))
+		{
+			hasNotified = false;
+			return;
+		}
+
+		int currentHP = getBoatHP();
+
+		if (currentHP < 0)
+		{
+			hasNotified = false;
+			return;
+		}
+
+		if (currentHP < threshold)
+		{
+			if (!hasNotified)
+			{
+				notifier.notify(notification, "Your boat's hitpoints are low!");
+				hasNotified = true;
+			}
+		}
+		else
+		{
+			hasNotified = false;
+		}
+	}
+
+	private int getBoatHP()
+	{
+		int hp = client.getVarbitValue(VarbitID.SAILING_SIDEPANEL_BOAT_HP);
+		if (hp >= 0)
+		{
+			return hp;
+		}
+
+		return -1;
+	}
+}

src/main/java/com/duckblade/osrs/sailing/module/SailingModule.java

@@ -28,6 +28,7 @@
 import com.duckblade.osrs.sailing.features.mes.HideStopNavigatingDuringTrials;
 import com.duckblade.osrs.sailing.features.mes.PrioritizeCargoHold;
 import com.duckblade.osrs.sailing.features.navigation.LightningCloudsOverlay;
+import com.duckblade.osrs.sailing.features.navigation.LowHPNotification;
 import com.duckblade.osrs.sailing.features.navigation.NavigationOverlay;
 import com.duckblade.osrs.sailing.features.navigation.RapidsOverlay;
 import com.duckblade.osrs.sailing.features.navigation.TrueTileIndicator;
@@ -87,6 +88,7 @@ Set<PluginLifecycleComponent> lifecycleComponents(
 		LightningCloudsOverlay lightningCloudsOverlay,
 		LostCargoHighlighter lostCargoHighlighter,
 		LostShipment lostShipment,
+		LowHPNotification lowHPNotification,
 		LuffOverlay luffOverlay,
 		CrystalExtractorHighlight crystalExtractorHighlight,
 		MermaidTaskSolver mermaidTaskSolver,
@@ -130,6 +132,7 @@ Set<PluginLifecycleComponent> lifecycleComponents(
 			.add(lightningCloudsOverlay)
 			.add(lostCargoHighlighter)
 			.add(lostShipment)
+			.add(lowHPNotification)
 			.add(luffOverlay)
 			.add(crystalExtractorHighlight)
 			.add(mermaidTaskSolver)