feat: disallow spawn of repeated dragons

scenes/dragon_list/dragon_list.tscn

@@ -59,6 +59,7 @@ patch_margin_left = 74
 patch_margin_right = 74
 
 [node name="Label" type="Label" parent="CanvasLayer/TowerNameLabel"]
+layout_mode = 0
 offset_left = 2.0
 offset_top = 2.0
 offset_right = 250.0

scenes/main.gd

@@ -62,15 +62,62 @@ func _instantiate_random_dragon():
 	if spot == null:
 		return
 	
-	#TODO: Add also a way to instantiate dragons in your library with a greater probability
+	var r = rng.randi_range(0, 99)
+	if r < 30:
+		_instantiate_dragon_from_internet(spot)
+	else:
+		_instantiate_dragon_from_library(spot)
+
+
+func _instantiate_dragon_from_library(spot: Node2D) -> void:
+	var dragons_available: Array[DragonProperties] = []
+	for dragon in _library.dragons:
+		if not _is_dragon_instantiated(dragon):
+			dragons_available.push_back(dragon)
+	
+	if dragons_available.size() == 0:
+		_instantiate_dragon_from_internet(spot)
+		return
+	
+	var r = rng.randi_range(0, dragons_available.size() - 1)
+	var dragon_entity: DragonEntity = _generate_entity(spot, dragons_available[r])
+	_filled_spots[spot] = dragon_entity.properties.id
+
+
+func _is_dragon_instantiated(dragon: DragonProperties) -> bool:
+	for entity: Dragon in _dragon_entities.values():
+		if _are_properties_equal(entity.properties, dragon):
+			return true
+	for entity: DragonEntity in _instantiated_dragons.values():
+		if _are_properties_equal(entity.properties, dragon):
+			return true
+	return false
+
+
+func _are_properties_equal(p1: DragonProperties, p2: DragonProperties) -> bool:
+	if p1.name != p2.name:
+		return false
+	if p1.origin != p2.origin:
+		return false
+	if p1.color != p2.color:
+		return false
+	if p1.hat != p2.hat:
+		return false
+	if p1.shirt != p2.shirt:
+		return false
+	if p1.decor != p2.decor:
+		return false
+	return true
+
+
+func _instantiate_dragon_from_internet(spot: Node2D) -> void:
 	for i in range(5):
 		dragon_sharing.receive(_save_load.get_tower_name())
 		var dragon: DragonProperties = await dragon_sharing.on_dragon_received
 		if dragon == null:
 			return
-		for d in _library.dragons:
-			# TODO: Search for dragon and if is in library or in instantiated dragons continue next iteration
-			pass
+		if _is_dragon_instantiated(dragon):
+			continue
 		var dragon_entity: DragonEntity = _generate_entity(spot, dragon)
 		_filled_spots[spot] = dragon_entity.properties.id
 		return