class_name Title
extends Node2D
## 启动界面：滚动海面打底，左右选择战机，回车/J 出击。

const PLANE_A_TEX := Player.TEX
const PLANE_B_TEX := preload("res://assets/svg/plane_funnel.svg")  # 兜底：美术 PNG 存在时优先
const FUNNEL_TEX := preload("res://assets/svg/funnel.svg")
const PLANE_B_ART := "res://assets/art/plane_funnel.png"


static func _plane_b_texture() -> Texture2D:
	if ResourceLoader.exists(PLANE_B_ART):
		return load(PLANE_B_ART)
	return PLANE_B_TEX

var _sel := 0
var _started := false
var _borders: Array[ColorRect] = []


func _ready() -> void:
	add_child(OceanScroll.new())

	var dim := ColorRect.new()
	dim.color = Color(0.02, 0.05, 0.1, 0.62)
	dim.set_anchors_preset(Control.PRESET_FULL_RECT)
	add_child(dim)

	var layer := CanvasLayer.new()
	layer.layer = 10
	add_child(layer)

	var title := Label.new()
	title.text = "AERO STRIKE"
	title.position = Vector2(0.0, 130.0)
	title.size = Vector2(540.0, 80.0)
	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	title.add_theme_font_size_override("font_size", 64)
	title.add_theme_color_override("font_color", Color(1.0, 0.85, 0.35))
	title.add_theme_color_override("font_shadow_color", Color(0.0, 0.0, 0.0, 0.8))
	title.add_theme_constant_override("shadow_offset_x", 3)
	title.add_theme_constant_override("shadow_offset_y", 3)
	layer.add_child(title)

	var subtitle := Label.new()
	subtitle.text = "1 9 4 2"
	subtitle.position = Vector2(0.0, 205.0)
	subtitle.size = Vector2(540.0, 40.0)
	subtitle.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	subtitle.add_theme_font_size_override("font_size", 28)
	subtitle.add_theme_color_override("font_color", Color(0.85, 0.9, 1.0))
	layer.add_child(subtitle)

	var choose := Label.new()
	choose.text = "— 选择战机 —"
	choose.position = Vector2(0.0, 300.0)
	choose.size = Vector2(540.0, 34.0)
	choose.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	choose.add_theme_font_size_override("font_size", 24)
	choose.add_theme_color_override("font_color", Color.WHITE)
	layer.add_child(choose)

	_build_card(layer, 0, 40.0, PLANE_A_TEX, "P-38 战斗机", "宽域机枪弹幕", "P 升级火力 · K 炸弹")
	_build_card(layer, 1, 280.0, _plane_b_texture(), "雷光 浮游炮型", "贯穿激光 + 浮游炮", "I 聚焦合体激光 · K 炸弹", true)

	var hint := Label.new()
	hint.text = "←→  选择      回车 / J  出击"
	hint.position = Vector2(0.0, 880.0)
	hint.size = Vector2(540.0, 34.0)
	hint.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	hint.add_theme_font_size_override("font_size", 22)
	hint.add_theme_color_override("font_color", Color(0.75, 0.8, 0.85))
	layer.add_child(hint)

	_update_selection()


func _build_card(parent: Node, index: int, x: float, tex: Texture2D, plane_name: String, line1: String, line2: String, with_funnels := false) -> void:
	var bg := ColorRect.new()
	bg.position = Vector2(x, 350.0)
	bg.size = Vector2(220.0, 330.0)
	bg.color = Color(0.08, 0.12, 0.18, 0.92)
	parent.add_child(bg)

	var border := ColorRect.new()
	border.position = bg.position - Vector2(4.0, 4.0)
	border.size = bg.size + Vector2(8.0, 8.0)
	border.color = Color(1.0, 0.82, 0.25)
	parent.add_child(border)
	_borders.append(border)

	var icon := Sprite2D.new()
	icon.texture = tex
	icon.scale = Vector2.ONE * 1.7
	icon.position = Vector2(x + 110.0, 455.0)
	parent.add_child(icon)

	if with_funnels:
		for i in 2:
			var funnel := Sprite2D.new()
			funnel.texture = FUNNEL_TEX
			funnel.position = Vector2(x + 110.0 + (-60.0 if i == 0 else 60.0), 425.0 + 30.0 * i)
			parent.add_child(funnel)

	var name_label := Label.new()
	name_label.text = plane_name
	name_label.position = Vector2(x, 545.0)
	name_label.size = Vector2(220.0, 34.0)
	name_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	name_label.add_theme_font_size_override("font_size", 24)
	name_label.add_theme_color_override("font_color", Color.WHITE)
	parent.add_child(name_label)

	var desc1 := Label.new()
	desc1.text = line1
	desc1.position = Vector2(x, 600.0)
	desc1.size = Vector2(220.0, 28.0)
	desc1.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	desc1.add_theme_font_size_override("font_size", 19)
	desc1.add_theme_color_override("font_color", Color(0.8, 0.88, 1.0))
	parent.add_child(desc1)

	var desc2 := Label.new()
	desc2.text = line2
	desc2.position = Vector2(x, 640.0)
	desc2.size = Vector2(220.0, 26.0)
	desc2.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	desc2.add_theme_font_size_override("font_size", 17)
	desc2.add_theme_color_override("font_color", Color(0.7, 0.78, 0.88))
	parent.add_child(desc2)


func _process(_delta: float) -> void:
	if _started:
		return
	if Input.is_action_just_pressed("move_left") and _sel != 0:
		_sel = 0
		_update_selection()
	elif Input.is_action_just_pressed("move_right") and _sel != 1:
		_sel = 1
		_update_selection()
	if Input.is_action_just_pressed("ui_accept") or Input.is_action_just_pressed("fire"):
		_started = true
		GameSession.plane_variant = _sel
		get_tree().change_scene_to_file("res://scenes/game.tscn")


func _update_selection() -> void:
	for i in _borders.size():
		_borders[i].visible = i == _sel