class_name Monster
extends CharacterBody3D

signal level_up

@export var data: MonsterData = MonsterData.new()

var spawn_point: Vector3 = Vector3(0, 0, 0)

# DEBUG MOVEMENT
@onready var time: float = 16.0
@onready var frequency: float = 1.0
@onready var amplitude: float = 0.5
var in_battle: bool = false

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	var model_instance = data.model.instantiate()
	frequency = randf_range(1.0, 4.0)
	amplitude = randf_range(1.0, 6.0)
	spawn_point = position
	add_child(model_instance)

func _physics_process(delta: float) -> void:
	if in_battle:
		velocity = Vector3.ZERO
		return

	time += delta
	var x_movement = sin(time * frequency) * amplitude
	var z_movement = cos(time * frequency) * amplitude
	velocity = Vector3(x_movement, 0, z_movement)
	
	# if move_and_slide reports collisions
	if move_and_slide():
		var collision = get_slide_collision(0)
		var collider = collision.get_collider()
		
		# if the monster collided with the player...
		if collider.name == "Player":
			velocity = Vector3.ZERO
			in_battle = true
			
			# calculate players new position
			# from the camera 3 units backwards
			var camera = collider.find_child("Camera3D")
			
			# local z axis of the camera
			var local_z = camera.global_transform.basis.z
			
			var new_player_position = camera.global_transform.origin + local_z * 3
			
			collider.start_battle(self, new_player_position)
			#rotate_toward(rotation.z, collider.rotation.z, 1.0)