ProjectZ/Assets/Scripts/Characters/Enemy/States/PatrolState.cs

using Koptilnya.StateMachine;
using Mirror;
using UnityEngine;
using UnityEngine.AI;

namespace Characters.Enemy.States
{
    public class PatrolState : State<EnemyState>
    {
        private readonly Enemy _enemy;
        private readonly NavMeshTriangulation _navMeshData;

        private CustomNetworkManager _networkManager;
        
        public PatrolState(Enemy enemy) : base(EnemyState.Patrol)
        {
            _enemy = enemy;
            _navMeshData = NavMeshTriangulator.Data;
            _networkManager = NetworkManager.singleton.GetComponent<CustomNetworkManager>();
        }

        public override void Enter()
        {
            if (!_enemy.isServer) return;
            
            _enemy.SetSpeedMul(1f);
            _enemy.SetAimRigWeight(0f);
        }

        public override void Update()
        {
            if (!_enemy.isServer) return;
            
            float sortDistance = float.MaxValue;
            foreach (var player in _networkManager.alive)
            {
                float distance = Vector3.Distance(player.transform.position, _enemy.transform.position);
                
                if (distance <= _enemy.aggressionDistance && distance < sortDistance && _enemy.agent.SetDestination(player.transform.position))
                {
                    sortDistance = distance;
                    _enemy.target = player.transform;
                }
            }

            if (_enemy.target != null)
            {
                _enemy.state = EnemyState.Chase;
            }
            
            var remainingDistance = _enemy.agent.GetPathRemainingDistance();
            var invalidPath = _enemy.agent.pathStatus != NavMeshPathStatus.PathComplete;
            
            if (remainingDistance <= 1.5f || invalidPath)
            {
                SetRandomDestination();
            }
        }

        void SetRandomDestination()
        {
            _enemy.agent.destination = GetRandomLocation();
        }
        
        Vector3 GetRandomLocation()
        {
            return _navMeshData.vertices[_navMeshData.indices[Random.Range(0, _navMeshData.indices.Length - 3)]];
        }
    }
}