From 7fd0f3a5a12ebb57856dd54a912ca64275761455 Mon Sep 17 00:00:00 2001
From: Gabriel Kaszewski <gabrielkaszewski@gmail.com>
Date: Wed, 25 Dec 2024 13:04:21 +0100
Subject: [PATCH] add damage and health component

---
 scripts/components/damage.gd |  7 +++++
 scripts/components/health.gd | 53 ++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 scripts/components/damage.gd
 create mode 100644 scripts/components/health.gd

diff --git a/scripts/components/damage.gd b/scripts/components/damage.gd
new file mode 100644
index 0000000..bcd6ce5
--- /dev/null
+++ b/scripts/components/damage.gd
@@ -0,0 +1,7 @@
+class_name DamageComponent
+extends Node2D
+
+@export var damage: float = 0.25
+
+func deal_damage(target: HealthComponent):
+	target.decrease_health(damage)
diff --git a/scripts/components/health.gd b/scripts/components/health.gd
new file mode 100644
index 0000000..fc09ff3
--- /dev/null
+++ b/scripts/components/health.gd
@@ -0,0 +1,53 @@
+class_name HealthComponent
+extends Node2D
+
+@export var health: float = 1.0
+@export var max_health: float = 1.0
+
+signal on_health_change(delta: float)
+signal on_death
+
+func _get_delta(value: float) -> float:
+	var old_value = health
+	return value - old_value
+
+func set_health(new_value: float):
+	var delta = _get_delta(new_value)
+	
+	if new_value >= max_health:
+		health = max_health
+		on_health_change.emit(delta)
+		return
+	
+	health = new_value
+	
+	if health <= 0:
+		on_death.emit()
+		return
+	
+	on_health_change.emit(delta)
+
+func decrease_health(value: float):
+	var delta = _get_delta(value)
+	
+	health -= value
+	
+	if health <= 0:
+		on_death.emit()
+		return
+		
+	on_health_change.emit(delta)
+	
+func increase_health(value: float):
+	var delta = _get_delta(value)
+	
+	health += value
+	
+	if health >= max_health:
+		health = max_health
+		on_health_change.emit(delta)
+		return
+	
+	health += value
+	on_health_change.emit(delta)
+