extends CanvasLayer

signal exit(success: bool)


@onready var ripple = $"水波" as Sprite2D
@onready var shader = $"水波Shader" as ColorRect
@onready var timer = $RippleTimer as Timer
@onready var child_sprite = $"人像幼年"
@onready var grownup_sprite = $"人像成年"

var image: Image

var show_childhood := false
func _ready() -> void:
	# 第三章设置为启用 c03_meta_enabled
	show_childhood = ArchiveManager.get_global_value("c03_meta_enabled", false)
	layer = GlobalConfig.CANVAS_LAYER_LITTLE_GAME
	image = ripple.texture.get_image()
	shader.gui_input.connect(_shader_input)
	timer.timeout.connect(_try_ripple)
	shader.material.set("shader_parameter/amplitude", 0.0)
	# 幼年 -> 成年
	if show_childhood:
		var tween = create_tween() as Tween
		tween.tween_interval(1.5)
		tween.tween_property(child_sprite, "modulate:a", 0.0, 0.5)
	else:
		child_sprite.modulate.a = 0
	await get_tree().create_timer(1.5).timeout
	_try_ripple()

func _try_ripple():
	if ripple_tween and ripple_tween.is_valid():
		return
	# 先尝试 mouse 位置
	var mouse_pos = shader.get_global_mouse_position()
	if not _make_ripple(mouse_pos):
		var rand_pos = Vector2(randf_range(140, 425), randf_range(80, 250))
		_make_ripple(rand_pos)


var ripple_tween: Tween


func _shader_input(event: InputEvent) -> void:
	if event.is_pressed():
		var pos = ripple.get_global_mouse_position()
		_make_ripple(pos)


func _make_ripple(pos:Vector2) -> bool:
	var p_pos = pos / ripple.scale.x
	var image_size = image.get_size()
	# return false if out of image
	if p_pos.x < 0 or p_pos.x > image_size.x or p_pos.y < 0 or p_pos.y > image_size.y:
		return false
	if image.get_pixelv(p_pos).a > 0:
		# setup shader_parameter/offset
		var m_offset = -Vector2(pos.x / 564 - 0.5, pos.y / 316 - 0.5)
		shader.material.set("shader_parameter/offset", m_offset)
		if GlobalConfig.DEBUG:
			print("水波特写 m_offset=", m_offset)
		if ripple_tween and ripple_tween.is_valid():
			ripple_tween.kill()
		ripple_tween = create_tween()
		ripple_tween.tween_property(shader.material, "shader_parameter/amplitude", 2.0, 0.3)
		if show_childhood:
			ripple_tween.parallel().tween_property(child_sprite, "modulate:a", 1.0, 0.2)
			ripple_tween.parallel().tween_property(grownup_sprite, "modulate:a", 0.5, 0.2)
		ripple_tween.tween_property(shader.material, "shader_parameter/amplitude", 0.0, 2.0)
		if show_childhood:
			ripple_tween.parallel().tween_property(child_sprite, "modulate:a", 0.0, 1.0)
			ripple_tween.parallel().tween_property(grownup_sprite, "modulate:a", 1.0, 1.5)
		return true
	return false