extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_enemy_detection_range.gd
# Forgejo #69: enemies used to beeline toward the fleet from anywhere on the
# map the instant they spawned. Chasers (EnemyPursuitComponent) and snipers
# (EnemyStandoffComponent) now sit idle until the fleet is within their own
# detection_range; the enemy mothership deliberately keeps an (effectively)
# unlimited range instead, since it is meant to read as a persistent,
# unavoidable stalking threat rather than a local sentry.
#
# Covers:
#   A. a chaser beyond detection_range does not move at all
#   B. the same chaser, once the fleet is within range, closes in
#   C. a sniper beyond detection_range does not move either
#   D. the enemy mothership closes in even from far beyond a chaser's range

var game_state: Node
var main: Node
var fleet: Node
var chaser: Node
var sniper: Node
var mothership: Node
var chaser_start: Vector2
var sniper_start: Vector2
var mothership_start: Vector2
var stage: int = 0
var elapsed: float = 0.0


func _initialize() -> void:
	game_state = root.get_node("GameState")
	game_state.buildings.clear()
	game_state.extractors.clear()
	game_state.transporters.clear()
	game_state.reset_progression()
	main = load("res://Main.tscn").instantiate()
	root.add_child(main)
	fleet = main.get_node("Fleet")


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			if elapsed < 0.2:
				return false
			main.get_node("EnemySpawner").set_process(false)
			main.get_node("AsteroidField").set_process(false)
			for a in get_nodes_in_group("asteroids"):
				a.queue_free()
			fleet.spawn_ships(1, Vector2.ZERO)

			# --- A. beyond detection_range: no movement at all ---------------
			chaser = load("res://Enemy.tscn").instantiate()
			chaser.enemy_id = "chaser"
			var pursuit: Node = null
			main.add_child(chaser)
			pursuit = chaser.get_component("pursuit")
			chaser.position = fleet.get_centroid() + Vector2(pursuit.detection_range + 300.0, 0.0)
			chaser_start = chaser.position

			sniper = load("res://Enemy.tscn").instantiate()
			sniper.enemy_id = "sniper"
			main.add_child(sniper)
			var standoff: Node = sniper.get_component("standoff")
			sniper.position = fleet.get_centroid() + Vector2(0.0, standoff.detection_range + 300.0)
			sniper_start = sniper.position

			elapsed = 0.0
			stage = 1
			return false
		1:
			if elapsed < 1.0:
				return false
			var chaser_moved: float = chaser.position.distance_to(chaser_start)
			var sniper_moved: float = sniper.position.distance_to(sniper_start)
			print("beyond range for 1.0s: chaser moved %.1f, sniper moved %.1f" % [chaser_moved, sniper_moved])
			if chaser_moved > 1.0:
				return _fail("a chaser beyond detection_range moved %.1f - it should sit idle" % chaser_moved)
			if sniper_moved > 1.0:
				return _fail("a sniper beyond detection_range moved %.1f - it should sit idle" % sniper_moved)

			# --- B. bring the chaser within range, it should now close in ----
			var pursuit: Node = chaser.get_component("pursuit")
			chaser.position = fleet.get_centroid() + Vector2(pursuit.detection_range * 0.5, 0.0)
			chaser_start = chaser.position
			elapsed = 0.0
			stage = 2
			return false
		2:
			if elapsed < 1.0:
				return false
			var chaser_moved: float = chaser.position.distance_to(chaser_start)
			print("within range for 1.0s: chaser moved %.1f" % chaser_moved)
			if chaser_moved < 20.0:
				return _fail("a chaser within detection_range did not close in (moved %.1f)" % chaser_moved)
			print("chaser correctly idle beyond range, closes in once inside it")

			# --- D. the mothership closes in from far beyond a chaser's range -
			mothership = load("res://Enemy.tscn").instantiate()
			mothership.enemy_id = "enemy_mothership"
			main.add_child(mothership)
			var mother_pursuit: Node = mothership.get_component("pursuit")
			if mother_pursuit.detection_range < 50000.0:
				return _fail("the mothership's pursuit range is not effectively unlimited (%f)" \
					% mother_pursuit.detection_range)
			mothership.position = fleet.get_centroid() + Vector2(5000.0, 0.0)
			mothership_start = mothership.position
			elapsed = 0.0
			stage = 3
			return false
		3:
			if elapsed < 1.0:
				return false
			var mothership_moved: float = mothership.position.distance_to(mothership_start)
			print("mothership 5000 units out, 1.0s: moved %.1f" % mothership_moved)
			if mothership_moved < 5.0:
				return _fail("the mothership did not close in from far away (moved %.1f)" % mothership_moved)
			print("TEST_ENEMY_DETECTION_RANGE: PASS")
			quit(0)
			return true
	return false


func _fail(message: String) -> bool:
	print("TEST_ENEMY_DETECTION_RANGE: FAIL (%s)" % message)
	quit(1)
	return true