extends CharacterBody3D

@export var player_id := 69:
	set(id):
		player_id = id
		%Input.set_multiplayer_authority(id)

@export var state_machine: Node

@export_group("Camera")
@export_range(0.0, 1.0) var mouse_sensitivity := 0.2
@export var camera_follow_speed := 20.0
@export var smooth_camera := false

@export_group("Movement")
@export var run_speed := 8.0
@export var walk_speed := 4.0
@export var acceleration := 45.0
@export var air_deceleration := 5.0
@export var rotation_speed := 20.0

@export_group("Client Smoothing")
@export var client_smoothing := false
@export var client_smoothing_speed := 10.0
@export var client_smoothing_rotation_speed := 25.0
@export var client_prediction := false
@export var client_prediction_tolerance := 0.3

@export_group("Server variables")
@export var server_position := Vector3.ZERO
@export var server_rotation := Vector3.ZERO

@onready var _camera_pivot: Node3D = %CameraPivot
@onready var _camera_platform: Node3D = %CameraPlatform
@onready var _camera: Node3D = %Camera
@onready var skin: Node3D = %Skin

var camera_input_direction := Vector2.ZERO
var last_direction := Vector3.FORWARD

var predicted_position := Vector3.ZERO
var predicted_rotation := Vector3.ZERO

func _ready() -> void:
	state_machine.set_subject(self)
	if multiplayer.is_server():
		return

	if multiplayer.get_unique_id() == player_id:
		%Camera.make_current()
	else:
		%Camera.clear_current(false)

func _input(event: InputEvent) -> void:
	if multiplayer.get_unique_id() != player_id:
		return

	if event.is_action_pressed("mouse_capture"):
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
	elif event.is_action_pressed("mouse_release"):
		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE

	if event is InputEventMouseMotion:
		if Input.get_mouse_mode() == Input.MOUSE_MODE_CAPTURED:
			camera_input_direction += event.screen_relative * mouse_sensitivity

func _process(delta: float) -> void:
	if multiplayer.get_unique_id() == player_id:
		_camera_platform.global_rotation = _camera_pivot.global_rotation

		if smooth_camera:
			_camera_platform.global_position = lerp(_camera_platform.global_position, _camera_pivot.global_position, camera_follow_speed * delta)
		else:
			_camera_platform.global_position = _camera_pivot.global_position

func _physics_process(delta: float) -> void:
	state_machine.process_physics(delta)
	if multiplayer.get_unique_id() == player_id:
		_camera_pivot.rotation.x = clamp(
			_camera_pivot.rotation.x - camera_input_direction.y * delta,
			-PI / 3.0,
			PI / 6.0,
		)
		_camera_pivot.rotation.y -= camera_input_direction.x * delta
		camera_input_direction = Vector2.ZERO

	if not multiplayer.is_server():
		if multiplayer.get_unique_id() == player_id and client_prediction:
			predicted_position = position
			predicted_rotation = skin.global_rotation

		if multiplayer.get_unique_id() != player_id or not client_prediction:
			if client_smoothing:
				position = lerp(position, server_position, client_smoothing_speed * delta)
				skin.global_rotation.y = lerp_angle(skin.global_rotation.y, server_rotation.y, client_smoothing_rotation_speed * delta)
			else:
				position = server_position
				skin.global_rotation.y = server_rotation.y

	if multiplayer.is_server():
		server_position = position
		server_rotation = skin.global_rotation
		pass

func _on_sync_delta_synchronized() -> void:
	if client_prediction and server_position.distance_to(predicted_position) > client_prediction_tolerance:
		print("%v VS %v" % [server_position, predicted_position])
		position = server_position