extends Node3D

var bullet_speed
var bullet_drop
var random_spread_amt
var bullet_damage
var instance_bullethole
var bullet_force_mod = 1.0
var distance_from_player
var player_position
var player_velocity

@onready var mesh = $gunbullet1
@onready var ray = $RayCast3D
@onready var particles = $GPUParticles3D
@onready var enemy_particles = $GPUParticlesEnemy
@onready var timer = $Timer
@onready var gunbullet1 = $gunbullet1/Cylinder
@onready var hit_indicator = $Audio/HitIndicator



var rng = RandomNumberGenerator.new()
var av_x
var av_y
var av_z

# Called when the node enters the scene tree for the first time.
func _ready():
	
	#apply random rotation
	av_x = deg_to_rad(rng.randf_range(-random_spread_amt,random_spread_amt))
	av_y = deg_to_rad(rng.randf_range(-random_spread_amt,random_spread_amt))
	av_z = deg_to_rad(rng.randf_range(-random_spread_amt,random_spread_amt))
	rotation += Vector3(av_x,av_y,av_z)
	timer.start()
	visible = false
	ray.target_position.z *= (bullet_speed/150)


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
	position += transform.basis * Vector3(0, 0, -bullet_speed) * delta
	rotation.x = clamp(rotation.x - delta * bullet_drop,deg_to_rad(-90),deg_to_rad(90))
	
	distance_from_player = abs(self.global_position - player_position)
	
	if distance_from_player.x > 2 or  distance_from_player.y > 2 or distance_from_player.z > 2:
		visible = true
	
	
	if ray.is_colliding() and !ray.get_collider().is_in_group("player"):
		
		mesh.visible = false
		ray.enabled = false
		
		#bullethole effect
		ray.get_collider().add_child(instance_bullethole)
		instance_bullethole.global_transform.origin = ray.get_collision_point()
		if (abs(ray.get_collision_normal().y) > 0.99):
			instance_bullethole.look_at(ray.get_collision_point() + ray.get_collision_normal(), Vector3(0,0,1))
		else:
			instance_bullethole.look_at(ray.get_collision_point() + ray.get_collision_normal())
		
		#move rigidbodies
		if ray.get_collider().is_in_group("scene_rigidbody"):
			ray.get_collider().linear_velocity += transform.basis * Vector3(0,0,-1 * bullet_force_mod)
		
		if ray.get_collider().is_in_group("breakable"):
			var current_velocity = transform.basis * Vector3(0,0,-1 * bullet_force_mod)
			ray.get_collider().breaking(current_velocity)

		
		if ray.get_collider().is_in_group("enemy_target"):
			hit_indicator.play()
			enemy_particles.emitting = true
			ray.get_collider().hit(bullet_damage)
		await get_tree().create_timer(1.0).timeout
		queue_free()