extends Node

func _ready() -> void:
	GameState.start_new_run()
	var game := preload("res://scenes/game/game.tscn").instantiate()
	add_child(game)
	game.set_physics_process(false)
	var ship := game.get_node("PlayerShip") as CharacterBody2D
	ship.set_physics_process(false)
	ship.get_node("WeaponController").set_physics_process(false)
	var systems := ship.get_node("ExtensionSystems")
	systems.set_physics_process(false)
	for enemy in get_tree().get_nodes_in_group("enemies"):
		enemy.queue_free()
	await get_tree().process_frame
	var hud := game.get_node("HUD")
	hud.call("_toggle_debug")
	var inventory := ship.get_node("ShipInventory") as ShipInventory
	var before := Vector3i(inventory.ammunition, inventory.irradiated_ammunition, inventory.missile_ammunition)
	var button := hud.get_node("HUDRoot/DebugActions/AddAmmunition") as Button
	button.pressed.emit()
	button.pressed.emit()
	assert(Vector3i(inventory.ammunition, inventory.irradiated_ammunition, inventory.missile_ammunition) == before + Vector3i(20, 20, 20))
	systems.call("activate", 5)
	var drones := get_tree().get_nodes_in_group("player_combat_drones")
	assert(drones.size() == 3)
	for drone in drones:
		drone.set_physics_process(false)
		assert(drone.scale == Vector2(0.5, 0.5))
	# Stationary formation converges to fixed positions in front, with no idle orbit.
	_step(ship, drones, 120)
	for drone in drones:
		assert(drone.global_position.distance_to(drone.call("formation_position")) < 2.0)
		assert((drone.global_position - ship.global_position).dot(Vector2.UP.rotated(ship.rotation)) > 60.0)
	# Forward flight and a turn inherit mother velocity without position snapping.
	ship.velocity = Vector2(0, -200)
	var previous_velocity: Vector2 = drones[0].get("velocity")
	_step(ship, drones, 1)
	assert((drones[0].get("velocity") as Vector2).distance_to(previous_velocity) <= 650.0 / 60.0 + 0.01)
	_step(ship, drones, 119)
	for drone in drones:
		assert(drone.global_position.distance_to(drone.call("formation_position")) < 12.0)
	ship.set("angular_velocity", 0.6)
	_step(ship, drones, 120, true)
	for drone in drones:
		assert(drone.global_position.distance_to(drone.call("formation_position")) < 15.0)
	ship.set("angular_velocity", 0.0)
	ship.velocity = Vector2.ZERO
	_step(ship, drones, 120)
	for drone in drones:
		assert(drone.global_position.distance_to(drone.call("formation_position")) < 2.0)
		assert((drone.get("velocity") as Vector2).length() < 3.0)
	print("DEBUG_AMMO_DRONE_FORMATION_TEST: PASS (debug ammo x10 repeatable, half scale, fixed forward formation, acceleration bound, moving/turning mother tracking, smooth stop)")
	get_tree().quit()

func _step(ship: CharacterBody2D, drones: Array[Node], frames: int, turning := false) -> void:
	for frame in frames:
		if turning:
			ship.rotation += 0.6 / 60.0
			ship.velocity = Vector2.UP.rotated(ship.rotation) * 200.0
		ship.position += ship.velocity / 60.0
		for drone in drones:
			drone.call("_physics_process", 1.0 / 60.0)