extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_no_popin_on_load.gd
# Verifies AsteroidField/PlanetField populate the area around the fleet's
# STARTING position immediately (synchronously, during Main.tscn's own
# _ready() chain), not only after their ~1s check_interval timer first
# elapses - otherwise the world visibly pops in a beat after the screen
# is already visible (most noticeable right after returning from a
# planet's surface, which is what this simulates via GameState).

var main_scene: Node
var asteroid_field: Node
var planet_field: Node


func _initialize() -> void:
	var target_chunk: Vector2i = Vector2i.ZERO
	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

	# GameState (an autoload) isn't accessible as a bare global identifier
	# from a script that extends SceneTree directly - that auto-injection
	# only applies to Node-derived scripts (e.g. everything inside
	# main_scene). Fetch it explicitly via the tree root instead.
	var game_state: Node = root.get_node("GameState")
	game_state.has_return_position = true
	game_state.surviving_ship_count = 5
	game_state.return_world_position = WorldGen.chunk_origin(target_chunk) + Vector2.ONE * WorldGen.CHUNK_SIZE * 0.5
	game_state.return_camera_zoom = 1.0

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


func _process(_delta: float) -> bool:
	# Check on literally the FIRST frame after the scene has entered the
	# tree and _ready() chains have run - no waiting for any spawner's
	# own check_interval timer.
	var asteroids_populated: bool = not asteroid_field.populated_chunks.is_empty()
	var planet_populated: bool = not planet_field.populated_chunks.is_empty()

	print("asteroids_populated=%s (chunks=%d) planet_populated=%s (chunks=%d)" % [
		asteroids_populated, asteroid_field.populated_chunks.size(),
		planet_populated, planet_field.populated_chunks.size()
	])

	if asteroids_populated and planet_populated:
		print("TEST_NO_POPIN_ON_LOAD: PASS")
		quit(0)
	else:
		print("TEST_NO_POPIN_ON_LOAD: FAIL")
		quit(1)
	return true