Added enemy movement randomization

game/controllers/enemy_swamp_controller.gd

@@ -0,0 +1,39 @@
+class_name EnemySwampController
+extends Node
+
+
+@export var passage : Passage
+
+
+const SMALL_ENEMY = preload("res://game/entities/ships/enemies/small/small_enemy_ship.tscn")
+const MEDIUM_ENEMY = preload("res://game/entities/ships/enemies/medium/medium_enemy_ship.tscn")
+const HEAVY_ENEMY = preload("res://game/entities/ships/enemies/heavy/heavy_enemy_ship.tscn")
+
+const ENEMY_TYPES := [ SMALL_ENEMY, MEDIUM_ENEMY, HEAVY_ENEMY ]
+
+
+@onready var enemy_update_timer : Timer = $EnemyUpdateTimer
+
+
+func create_enemy() -> void:
+	var enemy : AbstractEnemyShip = ENEMY_TYPES.pick_random().instantiate()
+	enemy.position = Vector2(750, randi_range(0, 360))
+	passage.add_child(enemy)
+	
+	_update_enemy.call_deferred(enemy)
+
+
+func _on_enemy_update_timer_timeout() -> void:
+	enemy_update_timer.start(randi_range(3, 9))
+	
+	var enemies := get_tree().get_nodes_in_group("enemies")
+	if enemies.is_empty(): return
+	
+	var enemy : Node = enemies.pick_random()
+	if not enemy is AbstractEnemyShip: return
+		
+	_update_enemy(enemy)
+
+
+func _update_enemy(enemy: AbstractEnemyShip) -> void:
+	enemy.controller.target_position = Vector2(randi_range(300, 600), randi_range(30, 330))