extends Node
func _ready() -> void:
	GameState.system_seed = 8428159
	var game := preload("res://scenes/game/game.tscn").instantiate()
	add_child(game)
	await get_tree().process_frame
	var manager := game.get_node("PlanetExpeditions")
	for enemy in get_tree().get_nodes_in_group("enemies"):
		enemy.position = Vector2(9000,9000)
	game.player.position = game.protected_planet.position
	game.player.landing_combat_lock = 0
	manager.scan_nearby()
	manager.land_nearby()
	var surface: Control = manager.screen
	assert(surface.lander.physics_interpolation_mode == Node.PHYSICS_INTERPOLATION_MODE_ON)
	assert(surface.lander.texture_filter == CanvasItem.TEXTURE_FILTER_LINEAR_WITH_MIPMAPS)
	# Deliberately separate physics and render rates to expose stepping.
	Engine.physics_ticks_per_second = 20
	Engine.max_fps = 120
	DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
	surface._motion.velocity = Vector2(160,0)
	var previous_physics: Vector2 = surface.lander.position
	var previous_render := previous_physics
	var interpolated_frames := 0
	var frame_times: Array[float] = []
	var start := Time.get_ticks_usec()
	var last := start
	for frame in 180:
		await RenderingServer.frame_post_draw
		var now := Time.get_ticks_usec()
		if frame > 20:
			frame_times.append((now-last)/1000.0)
		last = now
		var pose: Vector2 = surface.camera.position
		if surface.lander.position.is_equal_approx(previous_physics) and not pose.is_equal_approx(previous_render):
			interpolated_frames += 1
		previous_physics = surface.lander.position
		previous_render = pose
	assert(interpolated_frames > 20)
	Engine.physics_ticks_per_second = 60
	frame_times.sort()
	print("LANDER RENDER PASS: interpolated intermediate frames=",interpolated_frames,
		"; median frame ms=",frame_times[frame_times.size()/2],
		"; p95 ms=",frame_times[int(frame_times.size()*0.95)])
	surface.lander.position = Vector2.ZERO
	surface._previous_position = Vector2.ZERO
	surface.lander.rotation = 0
	surface._motion.velocity = Vector2.ZERO
	surface._motion.rotation = 0
	surface.lander.reset_physics_interpolation()
	surface.camera.position = Vector2.ZERO
	surface.camera.reset_smoothing()
	await get_tree().process_frame
	await RenderingServer.frame_post_draw
	get_viewport().get_texture().get_image().save_png("res://artifacts/lander_sharp_preview.png")
	manager.finish_surface(true)
	game.queue_free()
	await get_tree().process_frame
	get_tree().quit()