player: add Economy integration

player/player.gd

@@ -10,6 +10,7 @@ const gear_slots = ["1", "2", "3"]
 
 var starting_gear = preload("res://gears/ball.tscn")
 
+var ep = PlayerParticipant.new(self)
 var suspended = false
 var direction = Vector3.ZERO
 var target_velocity = Vector3.ZERO
@@ -27,13 +28,17 @@ func resize_ui():
 	$HUD.position.x = 0
 	$HUD.position.y = size.y - hud_h
 
-func make_hud():
+func make_hud(balance = ep.balance()):
+	if suspended: # TODO: CHANGE TO DEAD!
+		return
+
 	var text = ""
 	for node in $Backpack.get_children():
 		if not node is Gear:
 			continue
 		text += "%s (%s)\n" % [node.gear_name(), node.name]
 	text += "Holding " + $Pivot/Container/Gear.gear_name() + "\n"
+	text += str(balance) + " ₹ (rupees)\n"
 	text += str(health()) + " hp"
 	$HUD.text = text
 
@@ -147,6 +152,18 @@ func equip(gear: Gear):
 	message("Backpack full")
 	return false
 
+# Economy participant definition
+
+class PlayerParticipant extends Economy.Participant:
+	var player: Player
+	func _init(p: Player):
+		player = p
+		participant_name = "Player participant"
+	func message(string):
+		player.message(string)
+	func on_balance_update(bal):
+		player.make_hud(bal)
+
 # Player mechanics
 
 func move_player(x, z):
@@ -217,6 +234,7 @@ func do_gears():
 # Engine callbacks
 
 func _ready():
+	get_tree().current_scene.get_node("Economy").register(ep)
 	get_viewport().size_changed.connect(resize_ui)
 	resize_ui()
 	respawn()