extends KinematicBody2D

# Declare member variables here. Examples:
# var a: int = 2
# var b: String = "text"
onready var sightline: RayCast2D = $Sightline
onready var turret_state_machine = $TurretStateMachine
onready var lock_on_timer = $LockOnTimer
onready var sight_lost_timer = $SightLostTimer
onready var turret_animation = $AnimationPlayer.get_animation("Turret Rotation")
onready var Bullet = preload("res://src/HarmfulObjects/Bullet.tscn")
# Derives the freedom from the number of bald head eagles
onready var angle_of_freedom = deg2rad(
	turret_animation.track_get_key_value(
		0, turret_animation.track_get_key_count(0) - 1
	)
)
onready var original_rotation = rotation
onready var rotation_speed_divider = 80
# TODO causes oscilation
onready var min_rotation_speed = deg2rad(0.3)
# TODO Bug when dying in the wrong state, missing prey instance
var prey_ref = weakref(null)
# Ray that goes from the turret to the target
var target_ray


# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	$AnimationPlayer.play("Turret Rotation")

func prey():
	return prey_ref.get_ref()

func searching():
	$AnimationPlayer.play("Turret Rotation")
	if sightline.is_colliding():
		# The collider returns not the area or body it hit, but the parent of them
		var collider = sightline.get_collider()
		if collider.is_in_group("player"):
			print_debug(is_tracking_prey())
			prey_ref = weakref(collider)
			print_debug(is_tracking_prey())


# TODO should this stand still?
func start_locking():
	target_ray = RayCast2D.new()
	add_child(target_ray)
	target_ray.enabled = true
	target_ray.exclude_parent = true
	if(prey() != null):
		target_ray.set_cast_to(to_local(prey().position))
	$AnimationPlayer.stop(false)

	lock_on_timer.start()


func is_locked_on_target():
	return lock_on_timer.is_stopped()

func is_tracking_prey():
	return true if(prey() != null) else false

# TODO simplify/split this method
func shooting():
	var target_angle = target_ray.cast_to.angle_to(sightline.cast_to)
	var rotation_speed = max(
		min_rotation_speed, abs(target_angle / rotation_speed_divider)
	)
	if abs(target_angle) < min_rotation_speed:
		rotation = rotation - target_angle
	else:
		rotation = rotation - rotation_speed * sign(target_angle)
	rotation = clamp(
		rotation, original_rotation, original_rotation + angle_of_freedom
	)
	if sightline.is_colliding():
		# The collider returns not the area or body it hit, but the parent of them
		# TODO Sight could be a cone instead of a ray
		var collider = sightline.get_collider()
		if collider.is_in_group("player"):
			sight_lost_timer.stop()
			target_ray.cast_to = to_local(prey().position)
		else:
			if (
				sight_lost_timer.get_time_left() < 0.1
				&& sight_lost_timer.get_time_left() > 0
			):
				prey_ref = weakref(null)
				target_ray.queue_free()
				return
			if sight_lost_timer.is_stopped():
				sight_lost_timer.start()
			elif(prey() != null):
				target_ray.cast_to = to_local(prey().position)

	spawn_projectile()


func spawn_projectile():
	var b = Bullet.instance()
	owner.add_child(b)
	b.set_collision_mask_bit(1, false)
	b.transform = $Muzzle.global_transform