# QuestCurtain (40250 uiquest.py:58-105 对齐)
# 剧情 / 过场运镜模式的 16:9 电影上下黑边（Curtain / Letterbox）
class_name QuestCurtain
extends Control

const CURTAIN_SPEED := 200.0
const MIN_BAR_HEIGHT := 50.0

var top_bar: ColorRect
var bottom_bar: ColorRect
var _bar_height := 60.0
var _is_open := false
var _tween: Tween

func _init() -> void:
	name = "QuestCurtain"
	set_anchors_preset(PRESET_FULL_RECT)
	mouse_filter = MOUSE_FILTER_IGNORE
	z_index = 95

	top_bar = ColorRect.new()
	top_bar.name = "TopBar"
	top_bar.color = Color.BLACK
	top_bar.mouse_filter = MOUSE_FILTER_IGNORE
	add_child(top_bar)

	bottom_bar = ColorRect.new()
	bottom_bar.name = "BottomBar"
	bottom_bar.color = Color.BLACK
	bottom_bar.mouse_filter = MOUSE_FILTER_IGNORE
	add_child(bottom_bar)

	_reset_layout()

func _ready() -> void:
	get_viewport().size_changed.connect(_on_size_changed)
	_reset_layout()

func _get_screen_size() -> Vector2:
	if is_inside_tree() and get_viewport():
		return get_viewport_rect().size
	return Vector2(1024, 768)

func _on_size_changed() -> void:
	if _is_open:
		_calculate_bar_height()
		var sz := _get_screen_size()
		top_bar.position = Vector2(0, 0)
		top_bar.size = Vector2(sz.x, _bar_height)
		bottom_bar.position = Vector2(0, sz.y - _bar_height)
		bottom_bar.size = Vector2(sz.x, _bar_height)
	else:
		_reset_layout()

func _calculate_bar_height() -> float:
	var sz := _get_screen_size()
	# 40250: (GetScreenHeight() - GetScreenWidth() * 9 // 16) // 2
	var h: float = floorf((sz.y - sz.x * 9.0 / 16.0) / 2.0)
	if h < MIN_BAR_HEIGHT:
		h = MIN_BAR_HEIGHT
	_bar_height = h
	return _bar_height

func _reset_layout() -> void:
	var sz := _get_screen_size()
	_calculate_bar_height()
	top_bar.position = Vector2(0, -_bar_height - 1.0)
	top_bar.size = Vector2(sz.x, _bar_height)
	bottom_bar.position = Vector2(0, sz.y + 1.0)
	bottom_bar.size = Vector2(sz.x, _bar_height)

func open(duration: float = 0.4) -> void:
	_is_open = true
	var sz := _get_screen_size()
	_calculate_bar_height()
	if _tween and _tween.is_valid():
		_tween.kill()
	_tween = create_tween().set_parallel(true).set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_OUT)
	top_bar.size = Vector2(sz.x, _bar_height)
	bottom_bar.size = Vector2(sz.x, _bar_height)
	_tween.tween_property(top_bar, "position:y", 0.0, duration)
	_tween.tween_property(bottom_bar, "position:y", sz.y - _bar_height, duration)

func close(duration: float = 0.4) -> void:
	_is_open = false
	var sz := _get_screen_size()
	if _tween and _tween.is_valid():
		_tween.kill()
	_tween = create_tween().set_parallel(true).set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_IN)
	_tween.tween_property(top_bar, "position:y", -_bar_height - 1.0, duration)
	_tween.tween_property(bottom_bar, "position:y", sz.y + 1.0, duration)

func is_open() -> bool:
	return _is_open