extends Node3D

@export var sub_viewport: SubViewport
@onready var quad_cartello = $%QuadSign
@onready var coll_shape = $%CollisionShape3D

func _ready() -> void:
	sub_viewport.transparent_bg = true
	
	var mat = StandardMaterial3D.new()
	mat.albedo_texture = sub_viewport.get_texture()
	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	
	#fix color
	#sub_viewport.use_hdr_2d = false
	#mat.albedo_texture_force_srgb = true
	#mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	#mat.albedo_color = Color(0.85, 0.85, 0.85, 1.0)
	
	quad_cartello.material_override = mat
	
	coll_shape.shape.size = Vector3(2.0, 2.0, 2.0)
	coll_shape.position.z = 0.0


func _on_area_3d_input_event(camera: Node, event: InputEvent, event_position: Vector3, normal: Vector3, shape_idx: int) -> void:
	if event is InputEventMouse:
		var local_cam = quad_cartello.to_local(camera.global_position)
		var local_hit = quad_cartello.to_local(event_position)
		var ray_dir = (local_hit - local_cam).normalized()
		
		if abs(ray_dir.z) < 0.0001: return
		
		var t = -local_cam.z / ray_dir.z
		var exact_pos = local_cam + ray_dir * t
		
		var uv_x = exact_pos.x + 0.5
		var uv_y = 0.5 - exact_pos.y
		if uv_x < 0 or uv_x > 1 or uv_y < 0 or uv_y > 1:
			return
		
		var viewport_pos = Vector2(uv_x * sub_viewport.size.x, uv_y * sub_viewport.size.y)
		var ev2d = event.duplicate()
		ev2d.position = viewport_pos
		ev2d.global_position = viewport_pos
			
		sub_viewport.push_input(ev2d)