extends SceneTree
## Focused placement regression and CPU draw-cost comparison for large brick walls.

const WALL := preload("res://scripts/stage/scenery/stage_wall_panel.gd")
const CONTROLLER := preload("res://scripts/editors/stage/stage_scenery_controller.gd")

class TimedWall extends StageWallPanel:
	var draw_times_usec: Array[int] = []

	func _draw() -> void:
		var started: int = Time.get_ticks_usec()
		super._draw()
		draw_times_usec.append(Time.get_ticks_usec() - started)

var _failures: Array[String] = []


func _initialize() -> void:
	call_deferred("_run")


func _run() -> void:
	root.size = Vector2i(2560, 1440)
	var world := Node2D.new()
	var ghosts := Node2D.new()
	var controller := CONTROLLER.new() as StageSceneryController
	root.add_child(world)
	root.add_child(ghosts)
	root.add_child(controller)
	controller.configure(world, ghosts, null)
	controller.set_grid_snap(true, 15.0)
	var tint := Color("#995544")
	controller.begin_wall(&"finish_wall_brick", Vector2(-300.0, -150.0), tint)
	var ghost: StageWallPanel = ghosts.get_child(0) as StageWallPanel
	_expect(ghost.interactive_preview, "placement uses the inexpensive brick preview")
	var press := InputEventMouseButton.new()
	press.button_index = MOUSE_BUTTON_LEFT
	press.pressed = true
	controller.handle_mouse_button(press, Vector2(-300.0, -150.0), false)
	controller.handle_mouse_motion(Vector2(2100.0, 1150.0))
	var preview_bounds: Rect2 = ghost.global_transform * ghost.get_local_bounds()
	var release := InputEventMouseButton.new()
	release.button_index = MOUSE_BUTTON_LEFT
	controller.handle_mouse_button(release, Vector2(2100.0, 1150.0), false)
	_expect(world.get_child_count() == 1, "release commits one large wall")
	var committed: StageWallPanel = world.get_child(0) as StageWallPanel
	_expect(not committed.interactive_preview, "committed wall restores the full brick artwork")
	_expect(committed.finish_id == &"finish_wall_brick" and committed.tint == tint, "commit preserves the chosen finish and tint")
	_expect(preview_bounds.is_equal_approx(committed.global_transform * committed.get_local_bounds()), "preview and commit use the same snapped bounds across negative world coordinates")
	controller.exit_tool()
	world.free()
	ghosts.free()
	controller.free()

	var sample := TimedWall.new()
	sample.position = Vector2(1280.0, 720.0)
	sample.interactive_preview = true
	sample.configure(Vector2(2400.0, 1320.0), &"finish_wall_brick", tint)
	root.add_child(sample)
	await process_frame
	await process_frame
	var draw_count: int = sample.draw_times_usec.size()
	_expect(draw_count > 0, "large wall executes its drawing callback")
	sample.configure(sample.panel_size, sample.finish_id, sample.tint)
	await process_frame
	await process_frame
	_expect(sample.draw_times_usec.size() == draw_count, "unchanged snapped geometry does not rebuild the drawing")
	var preview_usec: float = await _measure_redraws(sample)
	sample.interactive_preview = false
	await process_frame
	await process_frame
	var detailed_usec: float = await _measure_redraws(sample)
	print("Brick draw CPU time (2400 x 1320): preview=%.2f ms, detailed=%.2f ms, speedup=%.1fx" % [preview_usec / 1000.0, detailed_usec / 1000.0, detailed_usec / maxf(1.0, preview_usec)])
	sample.free()
	if _failures.is_empty():
		print("PASS: scenery brick placement preview")
	else:
		for failure: String in _failures:
			push_error("FAIL: " + failure)
	quit(0 if _failures.is_empty() else 1)


func _measure_redraws(sample: TimedWall) -> float:
	sample.draw_times_usec.clear()
	for _iteration: int in 5:
		sample.queue_redraw()
		await process_frame
		await process_frame
	var total_usec: float = 0.0
	for elapsed: int in sample.draw_times_usec:
		total_usec += float(elapsed)
	return total_usec / maxf(1.0, float(sample.draw_times_usec.size()))


func _expect(condition: bool, message: String) -> void:
	if not condition:
		_failures.append(message)