feat: started work on health tracking

modules/wave_survival/health_status.cpp

@@ -0,0 +1,46 @@
+#include "health_status.h"
+#include "macros.h"
+
+String HealthStatus::sig_death{ "death" };
+String HealthStatus::sig_health_changed{ "health_changed" };
+
+void HealthStatus::_bind_methods() {
+	BIND_PROPERTY(Variant::INT, health);
+
+	ADD_SIGNAL(MethodInfo(sig_death));
+	ADD_SIGNAL(MethodInfo(sig_health_changed, PropertyInfo(Variant::INT, "remaining"), PropertyInfo(Variant::INT, "delta")));
+}
+
+void HealthStatus::ready() {
+	this->max_health = this->health;
+}
+
+void HealthStatus::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			ready();
+			return;
+	}
+}
+
+void HealthStatus::set_health(int value) {
+	this->health = value;
+}
+
+int HealthStatus::get_health() const {
+	return this->health;
+}
+
+void HealthStatus::damage(int amount) {
+	amount = Math::abs(amount);
+	this->health -= amount;
+	emit_signal(sig_health_changed, this->health, -amount);
+	if (this->health <= 0) {
+		emit_signal(sig_death);
+	}
+}

modules/wave_survival/health_status.h

@@ -0,0 +1,30 @@
+#ifndef HEALTH_STATUS_H
+#define HEALTH_STATUS_H
+
+#include "scene/main/node.h"
+
+class HealthStatus : public Node {
+	GDCLASS(HealthStatus, Node);
+	static void _bind_methods();
+	void ready();
+
+protected:
+	void _notification(int what);
+
+public:
+	void set_health(int health);
+	int get_health() const;
+
+	void damage(int amount);
+	void heal(int amount);
+
+private:
+	int max_health{ 1 };
+	int health{ 1 };
+
+public:
+	static String sig_death;
+	static String sig_health_changed;
+};
+
+#endif // !HEALTH_STATUS_H