Need help seting up Enemy AI Pathfinding (and states) in Top Down Shooter Game

Question

Hi i need help to set pathfinding to enemy ai in my top down shooter game because ai for the moment is just stupid and walks into walls to catch me.
By states i mean patrolling and attack for example patrolling state they will patrol area or dont move and when they see player they follow him with path finding

Comments

what code have you written so far? What kind of object is the enemy?

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Here's code of enemy:
P.S also my game will have multiple levels

extends KinematicBody2D

const MOVE_SPEED = 200

onready var raycast = $RayCast2D

var player = null

func ready():
addto_group("zombies")

func physicsprocess(delta):
if player == null:
return
var vectoplayer = player.globalposition - globalposition
vectoplayer = vectoplayer.normalized()
globalrotation = atan2(vectoplayer.y, vectoplayer.x)
moveandcollide(vectoplayer * MOVESPEED * delta)

if raycast.is_colliding():
    var coll = raycast.get_collider()
    if coll.name == "Player1":
        coll.kill()

func kill():
queue_free()

func set_player(p):
player = p