class_name GameKey extends Node3D

static var _scene := preload("res://scenes/game_key.tscn")

@export_group("Node references")
@export var _mesh: MeshInstance3D
@export var _upper_left_label: Label3D
@export var _upper_right_label: Label3D
@export var _lower_left_label: Label3D
@export var _lower_right_label: Label3D
@export var _center_label: Label3D
@export var _press_light: OmniLight3D
@export var _sfx_player: AudioStreamPlayer3D

@export_group("Light")
@export var _light_energy: float = 3
@export var _light_fade_time: float = 0.25

@export_group("Pressing")
@export var _press_offset: float = 0.1

@export_group("SFX")
@export var _press_sfx: AudioStream
@export var _release_sfx: AudioStream

var props: KeyProps
var keyboard: GameKeyboard
var input_event_init: InputEventKey

var _is_pressed: bool

var _input_event_main: InputEventKey
var _input_event_shift: InputEventKey
var _input_event_alt: InputEventKey
var _input_event_alt_shift: InputEventKey

var _light_timer: float

@onready var _default_position: Vector3 = position
@onready var _light_default_position: Vector3 = _press_light.position
@onready
var _polyphonic := _sfx_player.get_stream_playback() as AudioStreamPlaybackPolyphonic


static func instantiate_with_props(
	_props: KeyProps, _keyboard: GameKeyboard
) -> GameKey:
	var input_event := InputEventKey.new()
	input_event.physical_keycode = _props.physical_keycode
	input_event.location = _props.location

	var node := _scene.instantiate() as GameKey
	node.keyboard = _keyboard
	node.props = _props
	node.input_event_init = input_event
	node.name = node.name + " " + node.input_event_init.as_text_physical_keycode()
	if _props.location != KEY_LOCATION_UNSPECIFIED:
		node.name += " " + node.input_event_init.as_text_location()

	return node


func _ready() -> void:
	_mesh.scale.x = props.width_ratio
	_set_labels()


func _process(delta: float) -> void:
	_animate_light(delta)
	transform = keyboard.animator.animate_key(delta, _default_position)
	position.y -= _press_offset if _is_pressed else 0.0


func _unhandled_input(event: InputEvent) -> void:
	if event is not InputEventKey:
		return

	var event_key := event as InputEventKey

	if (
		event_key.physical_keycode != props.physical_keycode
		or event_key.location != props.location
		or event_key.echo
	):
		return

	_is_pressed = event_key.is_pressed()

	if _is_pressed:
		_play_sfx(_press_sfx)
	else:
		_play_sfx(_release_sfx)

	keyboard.pressed_positions[_default_position] = _is_pressed

	if LayoutConfig.is_configuring and _is_pressed:
		if not keyboard.alt_layout:
			if not event_key.shift_pressed:
				_input_event_main = event_key
			else:
				_input_event_shift = event_key
		else:
			if not event_key.shift_pressed:
				_input_event_alt = event_key
			else:
				_input_event_alt_shift = event_key

		_set_labels()


func _clear_labels() -> void:
	_upper_left_label.text = ""
	_upper_right_label.text = ""
	_lower_left_label.text = ""
	_lower_right_label.text = ""
	_center_label.text = ""


func _set_labels() -> void:
	_clear_labels()

	props.main_char = (
		char(_input_event_main.unicode).to_upper()
		if _input_event_main
		else props.main_char
	)
	props.shift_char = (
		char(_input_event_shift.unicode).to_upper()
		if _input_event_shift
		else props.shift_char
	)
	props.alt_char = (
		char(_input_event_alt.unicode).to_upper()
		if _input_event_alt
		else props.alt_char
	)
	props.alt_shift_char = (
		char(_input_event_alt_shift.unicode).to_upper()
		if _input_event_alt_shift
		else props.alt_shift_char
	)

	if not props.is_char():
		_center_label.text = input_event_init.as_text_physical_keycode()
		return

	if (
		(props.main_char and not props.shift_char)
		or props.main_char == props.shift_char
	):
		_upper_left_label.text = props.main_char

	if (props.main_char and props.shift_char) and props.main_char != props.shift_char:
		_upper_left_label.text = props.shift_char
		_lower_left_label.text = props.main_char

	if (
		(not props.main_char and props.shift_char)
		and props.main_char != props.shift_char
	):
		_upper_left_label.text = props.shift_char

	if props.alt_char and props.alt_char != props.main_char:
		_lower_right_label.text = props.alt_char

	if (
		props.alt_shift_char
		and props.alt_shift_char != props.alt_char
		and props.alt_shift_char != props.shift_char
	):
		_upper_right_label.text = props.alt_shift_char


func _animate_light(delta: float) -> void:
	if _is_pressed:
		_light_timer = _light_fade_time

	if _light_timer <= 0:
		_press_light.visible = false
		return

	_press_light.visible = true
	_press_light.light_energy = (_light_timer / _light_fade_time) * _light_energy
	_light_timer -= delta
	_press_light.position = _light_default_position
	_press_light.position.y += _press_offset if _is_pressed else 0.0


func _play_sfx(stream: AudioStream) -> void:
	_polyphonic.play_stream(stream)