extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_planet_spawning.gd
# Verifies PlanetField spawns a planet once the fleet enters a chunk where
# WorldGen says one belongs, and despawns it again once the fleet moves
# far enough away - mirrors test_asteroid_spawning.gd's lifecycle check.

var main_scene: Node
var fleet: Node
var planet_field: Node
var target_chunk: Vector2i
var spawned_planet: Node = null
var elapsed: float = 0.0
var stage: int = 0
var ok: bool = true


func _initialize() -> void:
	var found: bool = false
	for x in range(-15, 15):
		for y in range(-15, 15):
			var chunk: Vector2i = Vector2i(x, y)
			if WorldGen.has_planet_at_chunk(chunk):
				target_chunk = chunk
				found = true
				break
		if found:
			break

	if not found:
		print("FAIL: could not find any chunk with a planet to test with")
		quit(1)
		return

	var packed: PackedScene = load("res://Main.tscn")
	main_scene = packed.instantiate()
	root.add_child(main_scene)
	fleet = main_scene.get_node("Fleet")
	planet_field = main_scene.get_node("PlanetField")


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			var target_pos: Vector2 = WorldGen.chunk_origin(target_chunk) + Vector2.ONE * WorldGen.CHUNK_SIZE * 0.5
			for ship in fleet.ships:
				ship.position = target_pos
			fleet.move_to(target_pos)
			elapsed = 0.0
			stage = 1
			return false
		1:
			if elapsed < planet_field.check_interval + 0.1:
				return false
			_check_spawned()
			elapsed = 0.0
			stage = 2
			return false
		2:
			var far_pos: Vector2 = WorldGen.chunk_origin(target_chunk) + Vector2(50000, 50000)
			for ship in fleet.ships:
				ship.position = far_pos
			fleet.move_to(far_pos)
			elapsed = 0.0
			stage = 3
			return false
		3:
			if elapsed < planet_field.check_interval + 0.1:
				return false
			_check_despawned()
			return true
	return false


func _check_spawned() -> void:
	var has_chunk: bool = planet_field.populated_chunks.has(target_chunk)
	if not has_chunk:
		ok = false
		print("FAIL: target_chunk %s not populated after check_interval" % target_chunk)
		return

	var planets: Array = planet_field.populated_chunks[target_chunk]
	spawned_planet = planets[0] if planets.size() > 0 else null
	var count_ok: bool = planets.size() == 1
	var name_ok: bool = spawned_planet != null and spawned_planet.planet_name != ""

	ok = ok and count_ok and name_ok
	print("spawned_count=%d name_ok=%s planet_name=%s" % [planets.size(), name_ok, spawned_planet.planet_name if spawned_planet else "<none>"])


func _check_despawned() -> void:
	var chunk_removed: bool = not planet_field.populated_chunks.has(target_chunk)
	var freed: bool = spawned_planet == null or not is_instance_valid(spawned_planet)

	ok = ok and chunk_removed and freed
	print("chunk_removed=%s freed=%s" % [chunk_removed, freed])

	if ok:
		print("TEST_PLANET_SPAWNING: PASS")
		quit(0)
	else:
		print("TEST_PLANET_SPAWNING: FAIL")
		quit(1)