immersive-home/content/ui/components/input/input.gd

@tool
extends StaticBody3D

var text_handler = preload("res://content/ui/components/input/text_handler.gd").new()

@onready var caret: MeshInstance3D = $Label/Caret
@onready var mesh_box: MeshInstance3D = $Box
@onready var collision: CollisionShape3D = $Collision
@onready var animation: AnimationPlayer = $AnimationPlayer
@onready var label: Label3D = $Label

@export_range(0.1, 2, 0.01, "suffix:m") var width: float = 0.15:
	get:
		return text_handler.width
	set(value):
		set_width(value)
		
@export var text: String:
	get:
		return text_handler.text
	set(value):
		text_handler.set_text(value, EventSystem.is_focused(self) == false)

		if label != null:
			label.text = text_handler.get_display_text()

var keyboard_input: bool = false

var input_plane = Plane(Vector3.UP, Vector3.ZERO)

func _ready():
	text_handler.label = label
	text = text
	width = width

	if Engine.is_editor_hint():
		return

	EventSystem.on_key_down.connect(func(event):
		if EventSystem.is_focused(self) == false:
			return

		text = EventKey.key_to_string(event.key, event.shift_pressed, text.substr(0, text_handler.caret_position)) + text.substr(text_handler.caret_position, text.length())
		caret.position.x = text_handler.get_caret_position()
		label.text = text_handler.get_display_text()
	)

func _input(event):
	if event is InputEventKey && EventSystem.is_focused(self) && event.pressed:
		if event.keycode == KEY_F1:
			keyboard_input = !keyboard_input
			return

		if keyboard_input:
			text = EventKey.key_to_string(event.keycode, event.shift_pressed, text.substr(0, text_handler.caret_position)) + text.substr(text_handler.caret_position, text.length())
			caret.position.x = text_handler.get_caret_position()
		
func _process(_delta):
	if Engine.is_editor_hint():
		return

	if get_tree().debug_collisions_hint && OS.get_name() != "Android":
		_draw_debug_text_gaps()

func set_width(value: float):
	text_handler.width = value

	if mesh_box == null || collision == null || label == null:
		return

	mesh_box.mesh.size.x = value
	collision.shape.size.x = value
	label.position.x = -value / 2 + 0.002

func _on_press_move(event):
	var ray_pos = event.ray.global_position
	var ray_dir = -event.ray.global_transform.basis.z

	var local_pos = label.to_local(ray_pos)
	var local_dir = label.global_transform.basis.inverse() * ray_dir

	var intersection_point = input_plane.intersects_ray(local_pos, local_dir)

	if intersection_point == null:
			return

	var pos_x = intersection_point.x
	text_handler.update_caret_position(pos_x)

	caret.position.x = text_handler.get_caret_position()
	label.text = text_handler.get_display_text()

func _on_focus_in(event):
	var pos_x = label.to_local(event.ray.get_collision_point()).x
	text_handler.update_caret_position(pos_x)
	
	caret.position.x = text_handler.get_caret_position()
	label.text = text_handler.get_display_text()
	caret.show()
	animation.play("blink")

func update_caret_position(event):
	var ray_pos = event.ray.global_position
	var ray_dir = -event.ray.global_transform.basis.z

	var local_pos = label.to_local(ray_pos)
	var local_dir = label.global_transform.basis.inverse() * ray_dir

	var intersection_point = input_plane.intersects_ray(local_pos, local_dir)

	if intersection_point == null:
			return

	var pos_x = intersection_point.x
	text_handler.update_caret_position(pos_x)

	caret.position.x = text_handler.get_caret_position()
	

func _on_focus_out(_event):
	animation.stop()
	caret.hide()

func _draw_debug_text_gaps():
	if text_handler.gap_offsets == null:
		return

	for i in range(text_handler.gap_offsets.size()):
		var offset = text_handler.gap_offsets[i] - text_handler.gap_offsets[text_handler.char_offset]
		DebugDraw3D.draw_line(
			label.to_global(Vector3(offset, -0.01, 0)),
			label.to_global(Vector3(offset, 0.01, 0)),
			Color(1, 0, 0) if i != text_handler.overflow_index else Color(0, 1, 0)
		)