extends SceneTree

const EntryShell = preload("res://entry/entry_shell.gd")
const SettingsStore = preload("res://entry/settings_store.gd")

const DESIGN_ASPECT := 16.0 / 9.0
const SIZES := [Vector2i(1280, 720)]

var failures: Array[String] = []


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


func run_test() -> void:
	var viewport := SubViewport.new()
	viewport.size = SIZES[0]
	viewport.render_target_update_mode = SubViewport.UPDATE_ALWAYS
	root.add_child(viewport)
	var shell := EntryShell.new()
	shell.auto_start = false
	viewport.add_child(shell)
	await _frames(3)
	var settings := SettingsStore.new().defaults()
	settings.setup_completed = true
	settings.locale = "zh_CN"
	settings.text_scale = 1.3
	shell.settings = settings
	shell.setup_draft = settings.duplicate(true)
	shell.show_title()
	await _frames(4)
	for viewport_size in SIZES:
		viewport.size = viewport_size
		await _frames(3)
		_verify_layout(shell, viewport_size)
	if failures.is_empty():
		print("ABG_DEV1_TITLE_RESPONSIVE_OK sizes=1280x720 canvas=16:9 centered world=full controls=4 resize=true")
		quit(0)
	else:
		for failure in failures:
			push_error(failure)
		quit(1)


func _verify_layout(shell: Control, viewport_size: Vector2i) -> void:
	var bounds := Rect2(Vector2.ZERO, Vector2(viewport_size))
	var world := shell.find_child("TitleMasterWorldExtension", true, false) as Control
	var canvas := shell.find_child("TitleSafeArea", true, false) as Control
	var composite := shell.find_child("TitleMasterComposite", true, false) as TextureRect
	expect(world != null and canvas != null and composite != null, "%dx%d Title composition layers exist" % [viewport_size.x, viewport_size.y])
	if world == null or canvas == null or composite == null:
		return
	var canvas_rect := canvas.get_global_rect()
	expect(bounds.encloses(canvas_rect), "%dx%d Title canvas is fully visible" % [viewport_size.x, viewport_size.y])
	expect(is_equal_approx(canvas_rect.size.x / canvas_rect.size.y, DESIGN_ASPECT), "%dx%d Title canvas preserves 16:9" % [viewport_size.x, viewport_size.y])
	expect(canvas_rect.get_center().is_equal_approx(bounds.get_center()), "%dx%d Title canvas is centered" % [viewport_size.x, viewport_size.y])
	expect(world.get_global_rect().is_equal_approx(bounds), "%dx%d Title world fills the viewport" % [viewport_size.x, viewport_size.y])
	expect(composite.get_global_rect().is_equal_approx(canvas_rect), "%dx%d Title composite shares the design canvas" % [viewport_size.x, viewport_size.y])
	for node_name in ["TitleNewGame", "TitleContinue", "TitleSettings", "TitleCredits"]:
		var control := shell.find_child(node_name, true, false) as Control
		expect(control != null and canvas_rect.encloses(control.get_global_rect()), "%dx%d %s remains inside the Title canvas" % [viewport_size.x, viewport_size.y, node_name])
	var viewport_aspect := float(viewport_size.x) / float(viewport_size.y)
	if viewport_aspect < DESIGN_ASPECT:
		expect(is_equal_approx(canvas_rect.size.x, float(viewport_size.x)) and canvas_rect.position.y > 0.0, "%dx%d uses vertical World extension" % [viewport_size.x, viewport_size.y])
	elif is_equal_approx(viewport_aspect, DESIGN_ASPECT):
		expect(canvas_rect.is_equal_approx(bounds), "%dx%d uses the complete device frame" % [viewport_size.x, viewport_size.y])
	else:
		expect(is_equal_approx(canvas_rect.size.y, float(viewport_size.y)) and canvas_rect.position.x > 0.0, "%dx%d uses horizontal World extension" % [viewport_size.x, viewport_size.y])


func _frames(count: int) -> void:
	for frame in range(count):
		await process_frame


func expect(condition: bool, message: String) -> void:
	if not condition:
		failures.append("DEV-1 Title responsive: %s" % message)