extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_enemy_composition.gd
# Verifies:
#   1. an Enemy resolves its stats/hull/color from EnemyDefinitions, not
#      hardcoded fields
#   2. an enemy instantiated under a node that is NOT a sibling of Fleet
#      still finds the fleet and pursues it (the old `../Fleet` path would
#      break here - this is exactly the planet-surface hazard #44 exists
#      to close before #45/#46 land)

var main_scene: Node
var fleet: Node
var nested_host: Node2D
var enemy: Node
var elapsed: float = 0.0
var stage: int = 0


func _initialize() -> void:
	var chaser_def: Resource = EnemyDefinitions.get_definition("chaser")
	if chaser_def.enemy_id != "chaser" or chaser_def.max_hp != 3:
		return _fail("EnemyDefinitions did not resolve the chaser definition")

	main_scene = load("res://world/Main.tscn").instantiate()
	root.add_child(main_scene)
	fleet = main_scene.get_node("Fleet")
	main_scene.get_node("EnemySpawner").set_process(false)

	# Deliberately NOT a sibling of Fleet - two levels deep under an
	# unrelated node, the way a planet surface's SurfaceFeatures parents
	# things.
	nested_host = Node2D.new()
	nested_host.name = "NestedHost"
	main_scene.add_child(nested_host)
	var inner: Node2D = Node2D.new()
	inner.name = "Inner"
	nested_host.add_child(inner)

	enemy = load("res://enemies/Enemy.tscn").instantiate()
	enemy.position = fleet.get_centroid() + Vector2(600, 0)
	inner.add_child(enemy)


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			if elapsed < 0.1:
				return false
			if enemy.definition == null or enemy.definition.enemy_id != "chaser":
				return _fail("enemy did not resolve its definition on _ready")
			if enemy.hp != enemy.definition.max_hp:
				return _fail("enemy hp did not come from the definition")
			if not enemy.has_capability("pursuit"):
				return _fail("chaser did not compose a pursuit component")
			elapsed = 0.0
			stage = 1
			return false
		1:
			# Give the pursuit component a few physics ticks to close distance.
			if elapsed < 1.0:
				return false
			var distance: float = enemy.position.distance_to(fleet.get_centroid())
			print("distance_after_1s=%.1f (started at 600)" % distance)
			if distance >= 550.0:
				return _fail("enemy under a non-sibling host never approached the fleet")
			print("TEST_ENEMY_COMPOSITION: PASS")
			quit(0)
			return true
	return false


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