class_name Projectile
extends Area3D

const HEIGHT: float = 1
const MAX_STRETCH: float = 0.75

@export var _speed_stretch_factor: float = 100

@export var _hit_particles_scene: PackedScene
@export var _destroy_particles_scene: PackedScene

@export_group("References")
@export var _model_base: Node3D
@export var _model_mesh: MeshInstance3D

var _start_position: Vector3
var _velocity: Vector3
var _lifetime: float
var _size: float = 0.25

var _life_timer: float


func _ready() -> void:
	_life_timer = _lifetime
	global_position = _start_position
	body_entered.connect(_on_body_entered)
	_model_mesh.rotation = Vector3(
		randf_range(0, TAU), randf_range(0, TAU), randf_range(0, TAU)
	)
	_model_mesh.scale = Vector3.ONE * _size


func _physics_process(delta: float) -> void:
	if _life_timer <= 0:
		queue_free()

	_life_timer -= delta
	global_position += _velocity * delta
	look_at(global_position + _velocity, Vector3.UP, true)

	var speed_squash := clampf(
		_velocity.length() / _speed_stretch_factor, 0, MAX_STRETCH
	)
	_model_base.scale = Vector3(1 - speed_squash, 1 - speed_squash, 1 + speed_squash)


func init(velocity: Vector3, start_position: Vector3, lifetime: float = 10) -> void:
	_velocity = velocity
	_start_position = start_position
	_lifetime = lifetime


func hit(velocity: Vector3) -> void:
	var hit_particles := (
		_hit_particles_scene.instantiate() as Particles3DSelfDestructing
	)
	get_tree().get_root().add_child(hit_particles)
	hit_particles.init(global_position, velocity)
	set_velocity(velocity)


func set_velocity(velocity: Vector3) -> void:
	_velocity = velocity
	_life_timer = _lifetime


func _destroy() -> void:
	var destroy_particles := (
		_destroy_particles_scene.instantiate() as Particles3DSelfDestructing
	)
	get_tree().get_root().add_child(destroy_particles)
	destroy_particles.init(global_position)
	queue_free()


func _on_body_entered(node: Node3D) -> void:
	if node is Player:
		queue_free()
		var player := node as Player
		player.stats.damage()
		return

	if node is CollisionObject3D:
		var collision_node := node as CollisionObject3D
		if collision_node.collision_layer & 1:
			_destroy()
			return

	if node is CSGCombiner3D:
		var collision_node := node as CSGCombiner3D
		if collision_node.collision_layer & 1:
			_destroy()
			return