Added upgrade system

PermUpgrade/PermUpgrade.gd

@@ -0,0 +1,74 @@
+extends PanelContainer
+
+class_name PermUpgrade
+
+@export var Name : String = ""
+@export var GlobalVariable : String = ""
+@export var BaseCost : int = 10
+
+@onready var Level1 = $Container/Level1
+@onready var Level2 = $Container/Level2
+@onready var Level3 = $Container/Level3
+@onready var Level4 = $Container/Level4
+@onready var Level5 = $Container/Level5
+@onready var NameNode = $Container/Name
+@onready var StatusNode = $Container/Status
+@onready var BuyButton = $Container/Cost
+
+var cost = BaseCost
+
+func _ready() -> void:
+	update()
+	EventBus.upgrade_tokens_updated.connect(_on_upgrade_tokens_updated)
+
+
+func update() -> void:
+	cost = BaseCost
+	var qty = Global.get(GlobalVariable)
+	
+	var inactive : Color = Color.DARK_SLATE_GRAY
+	
+	
+	if qty < 1:
+		Level1.modulate = inactive
+	else:
+		Level1.modulate = Color.ROYAL_BLUE
+		cost *= 2
+	if qty < 2:
+		Level2.modulate = inactive
+	else:
+		cost *= 2
+		Level2.modulate = Color.GREEN
+	if qty < 3:
+		Level3.modulate = inactive
+	else:
+		cost *= 2
+		Level3.modulate = Color.RED
+	if qty < 4:
+		Level4.modulate = inactive
+	else:
+		cost *= 2
+		Level4.modulate = Color.SILVER
+	if qty < 5:
+		Level5.modulate = inactive
+	else:
+		cost = -1
+		Level5.modulate = Color.GOLD
+		BuyButton.text = "MAX"
+
+	NameNode.text = Name
+	StatusNode.text = Global.call("format_" + GlobalVariable)
+	if not cost == -1:
+		BuyButton.text = "%d" % cost
+
+	BuyButton.disabled = (Global.upgrade_tokens < cost) or (cost == -1)
+
+func _on_cost_pressed() -> void:
+	var now = Global.get(GlobalVariable)
+	if now < 5:
+		Global.set(GlobalVariable, now + 1)
+		Global.upgrade_tokens -= cost
+	pass # Replace with function body.
+
+func _on_upgrade_tokens_updated(qty : int) -> void:
+	update()