extends Node3D

const HUNGER_CUE_BASE_Y := 2.05
const FED_RESPONSE_BASE_Y := 1.8

@onready var head_root: Node3D = $HeadRoot
@onready var tail_root: Node3D = $TailRoot
@onready var hunger_cue_root: Node3D = $HungerCueRoot
@onready var fed_response_root: Node3D = $FedResponseRoot
@onready var leg_front_left: Node3D = $LegFrontLeft
@onready var leg_front_right: Node3D = $LegFrontRight
@onready var leg_back_left: Node3D = $LegBackLeft
@onready var leg_back_right: Node3D = $LegBackRight

var idle_phase := 0.0
var is_hungry := false
var is_moving := false
var fed_tween: Tween
var head_base_position: Vector3
var visual_base_position: Vector3


func _ready() -> void:
	head_base_position = head_root.position
	visual_base_position = position
	reset_transient_feedback()


func _process(delta: float) -> void:
	idle_phase = fmod(idle_phase + delta, TAU)
	var breath := sin(idle_phase * 1.7) * 0.025
	var hungry_drop := -0.12 if is_hungry else 0.0
	var walking_bob := absf(sin(idle_phase * 5.4)) * 0.045 if is_moving else 0.0
	position.y = visual_base_position.y + walking_bob
	head_root.position.y = head_base_position.y + breath + hungry_drop
	head_root.rotation_degrees.x = (
		8.0 + sin(idle_phase * 1.2) * 2.0 if is_hungry else -3.0 + sin(idle_phase * 1.4) * 2.5
	)
	tail_root.rotation_degrees.z = sin(idle_phase * 3.1) * (4.0 if is_hungry else 13.0)
	var stride := sin(idle_phase * 5.4) * 14.0 if is_moving else 0.0
	leg_front_left.rotation_degrees.x = stride
	leg_back_right.rotation_degrees.x = stride
	leg_front_right.rotation_degrees.x = -stride
	leg_back_left.rotation_degrees.x = -stride
	if hunger_cue_root.visible:
		hunger_cue_root.position.y = HUNGER_CUE_BASE_Y + sin(idle_phase * 2.2) * 0.07


func set_hungry(value: bool) -> void:
	is_hungry = value
	hunger_cue_root.visible = value


func set_moving(value: bool) -> void:
	is_moving = value
	if not value:
		position = visual_base_position
		leg_front_left.rotation_degrees.x = 0.0
		leg_front_right.rotation_degrees.x = 0.0
		leg_back_left.rotation_degrees.x = 0.0
		leg_back_right.rotation_degrees.x = 0.0


func reset_transient_feedback() -> void:
	if fed_tween != null:
		fed_tween.kill()
	fed_tween = null
	fed_response_root.visible = false
	fed_response_root.position.y = FED_RESPONSE_BASE_Y
	fed_response_root.scale = Vector3(0.2, 0.2, 0.2)


func play_fed_response() -> void:
	reset_transient_feedback()
	fed_response_root.visible = true
	fed_tween = create_tween()
	fed_tween.set_trans(Tween.TRANS_BACK).set_ease(Tween.EASE_OUT)
	fed_tween.tween_property(fed_response_root, "scale", Vector3.ONE, 0.34)
	fed_tween.parallel().tween_property(
		fed_response_root, "position:y", FED_RESPONSE_BASE_Y + 0.22, 0.34
	)
	fed_tween.set_trans(Tween.TRANS_SINE).set_ease(Tween.EASE_IN)
	fed_tween.tween_interval(0.7)
	fed_tween.tween_property(fed_response_root, "scale", Vector3(0.2, 0.2, 0.2), 0.42)
	fed_tween.finished.connect(_on_fed_response_finished)


func _on_fed_response_finished() -> void:
	fed_response_root.visible = false
	fed_tween = null