extends Node3D

signal selected(target: Node3D)
signal deselected(target: Node3D)
signal clicked(target: Node3D)

const RUNNER2CAMERA_LERP: float = 0.125

@export var spin_speed: float = 1.0
@export var hover_amplitude: float = 1.0
@export var hover_frequency: float = 0.5
@export var scale_timeout: float = 0.5
@export var click_scale_timeout: float = 0.25
@export var click_spin_boost: float = 4.0
@export var select_sound: AudioStream
@export var deselect_sound: AudioStream
@export var click_sound: AudioStream

@onready var _audio_player := $AudioStreamPlayer as AudioStreamPlayer
@onready var _material := (
	($Cube as MeshInstance3D).get_surface_override_material(0)
) as ShaderMaterial
@onready var _test_camera := $SceneTestCamera as SceneTestCamera
@onready var _lock := NonReentrantCoroutineMutex.new()

var _target: Node3D = null
var _target_offset := Vector3.ZERO
var _hover_phase: float = 0.0
var _camera_distance_on_interact: float = FX.DEFAULT_CAMERA_DISTANCE
var _saved_camera_distance: float = FX.DEFAULT_CAMERA_DISTANCE

var target: Node3D:
	get: return _target
	set(whom): await select(whom)

func _ready() -> void:
	if not _test_camera.test_mode:
		hide()

func _process(delta: float) -> void:
	if visible:
		if _target:
			global_position = _target.global_position + _target_offset
		global_position += delta*Vector3.UP*hover_amplitude*sin(_hover_phase)
		_hover_phase = fposmod(
			_hover_phase + delta*TAU*hover_frequency,
			TAU
		)
		rotate(Vector3.UP, spin_speed*delta)

func select(
	whom: Node3D,
	color: Color = Color.WHITE,
	offset: Vector3 = Vector3.ZERO,
	camera_distance_on_interact: float = FX.DEFAULT_CAMERA_DISTANCE
) -> void:
	if whom == _target:
		pass
	elif not whom:
		await deselect()
	else:
		await Wait.until(PlayerControl.enabled)
		if _target:
			await deselect()
		await _lock.acquire()
		await _do_select_anim(
			whom, color, offset, camera_distance_on_interact
		)
		_target = whom
		selected.emit(_target)
		_lock.relinquish()

func deselect(whom: Node3D = null) -> void:
	await _lock.acquire()
	if _target:
		if not whom:
			whom = _target
		if _target == whom:
			_target = null
			await _do_deselect_anim()
			deselected.emit(whom)
	_lock.relinquish()

func targeting(whom: Node3D = self) -> bool:
	if not whom:
		return not _target
	elif whom == self:
		return not not _target
	else:
		return _target == whom

func click() -> void:
	await _lock.acquire()
	if _target:
		PlayerControl.borrow()
		await _do_click_anim_first_part()
		PlayerControl.restore()
		FX.set_camera_target_override(self)
		_saved_camera_distance = FX.get_camera_distance()
		FX.set_camera_distance(_camera_distance_on_interact)
		clicked.emit(_target)
		await Wait.tick()
		await Wait.until(PlayerControl.enabled)
		FX.clear_camera_target_override()
		FX.set_camera_distance(_saved_camera_distance)
		await _do_click_anim_second_part()
	_lock.relinquish()

func _do_select_anim(
	new_target: Node3D,
	color: Color,
	offset: Vector3,
	camera_distance_on_interact: float
) -> void:
	_target_offset = offset
	_camera_distance_on_interact = camera_distance_on_interact
	color = Color(color, 0.75)
	_material.set_shader_parameter(&'color', color)
	_material.set_shader_parameter(&'glow', color/2.0)
	_audio_player.stream = select_sound
	_audio_player.play()
	show()
	scale = Vector3.ZERO
	var timeout: float = scale_timeout
	var new_position := new_target.global_position + _target_offset
	var old_position := new_position
	var runner := PlayerControl.get_runner()
	if runner:
		old_position = runner.global_position.lerp(
			PlayerControl.get_camera().global_position,
			RUNNER2CAMERA_LERP
		)
	while timeout > 0.0:
		var delta: float = await Wait.tick()
		scale += Vector3.ONE*delta/scale_timeout
		global_position = old_position.lerp(
			new_position,
			1.0 - timeout/scale_timeout
		)
		timeout -= delta
	scale = Vector3.ONE

func _do_deselect_anim() -> void:
	_audio_player.stream = deselect_sound
	_audio_player.play()
	scale = Vector3.ONE
	var timeout: float = scale_timeout/2.0
	var old_position := global_position
	var new_position := old_position
	var runner := PlayerControl.get_runner()
	while timeout > 0.0:
		if runner:
			new_position = runner.global_position.lerp(
				PlayerControl.get_camera().global_position,
				RUNNER2CAMERA_LERP
			)
		var delta: float = await Wait.tick()
		scale -= Vector3.ONE*4.0*delta/scale_timeout
		global_position = old_position.lerp(
			new_position,
			1.0 - timeout/scale_timeout
		)
		timeout -= delta
	scale = Vector3.ZERO
	hide()

func _do_click_anim_first_part() -> void:
	_audio_player.stream = click_sound
	_audio_player.play()
	scale = Vector3.ONE
	var runner := PlayerControl.get_runner()
	if runner:
		runner.turn_toward(global_position)
	var timeout: float = click_scale_timeout
	while timeout > 0.0:
		var delta: float = await Wait.tick()
		scale -= Vector3.ONE*delta/click_scale_timeout
		rotate(Vector3.UP, click_spin_boost*delta)
		timeout -= delta
	scale = Vector3.ZERO
	hide()

func _do_click_anim_second_part() -> void:
	show()
	var timeout: float = click_scale_timeout
	while timeout > 0.0:
		var delta: float = await Wait.tick()
		scale += Vector3.ONE*delta/click_scale_timeout
		rotate(Vector3.UP, click_spin_boost*delta)
		timeout -= delta
	scale = Vector3.ONE

func _input(event: InputEvent) -> void:
	if (
		(not not _target) and
		PlayerControl.enabled() and
		event.is_action_released(&'interact')
	):
		get_viewport().set_input_as_handled()
		click()