sasalka/Code/AI/Enemy.cs

using Sandbox;
using Sandbox.Citizen;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public sealed partial class Enemy : Component
{
	public enum EnemyState
	{
		Idle,
		Chase,
		Attack,
		Patrol,
		Death
	}

	[Property, Sync] public int Health { get; set; } = 100;
	[Property] public float MaxSpeed { get; set; } = 400;

	[Property] public NavMeshAgent agent;
	[Property] public SkinnedModelRenderer renderer;
	[Property] public CitizenAnimationHelper AnimationHelper;

	[Property, Sync] public EnemyState CurrentState { get; set; } = EnemyState.Idle;
	[Property] public float DetectionRadius = 1000f;
	[Property] public float AttackRadius = 80f;
	[Property] public float AttackCooldown = 1f;
	[Property] public RagdollController RagdollController;
	[Property] public SoundPointComponent HitSound { get; set; }
	[Property] public GameObject bloodParticle { get; set; }

	private TimeSince _timeSinceLastAttack;
	private Dedugan _currentTarget;
	private TimeSince _lastTargetCheck;
	private const float TargetCheckInterval = 1.5f;

	private List<Dedugan> _potentialTargets = new();
	private TimeSince _lastSearchRefresh;
	private TimeSince _stateEnterTime;

	public event Action<EnemyState, EnemyState> OnStateChanged;

	protected override void OnStart()
	{
		renderer.Set( "scale_height", 2f );
		_timeSinceLastAttack = 0;
		_lastTargetCheck = 0;
		RefreshPotentialTargets();
		SwitchState( EnemyState.Idle );
		
		// if ( !Network.IsOwner ) return;
		
		if ( renderer is null )
			return;

		renderer.OnFootstepEvent += OnFootstepEvent;
	}

	protected override void OnUpdate()
	{
		// Всегда проверяем ближайшую цель
		if ( _lastTargetCheck > TargetCheckInterval && CurrentState != EnemyState.Death )
		{
			FindClosestTarget();
			_lastTargetCheck = 0;
		}

		switch ( CurrentState )
		{
			case EnemyState.Idle:
				UpdateIdleState();
				break;
			case EnemyState.Chase:
				UpdateChaseState();
				break;
			case EnemyState.Attack:
				UpdateAttackState();
				break;
			case EnemyState.Patrol:
				UpdatePatrolState();
				break;
			case EnemyState.Death:
				UpdateDeathState();
				break;
		}
	}

	private void SwitchState( EnemyState newState )
	{
		if ( CurrentState == newState ) return;
		if ( CurrentState == EnemyState.Death ) return;

		var previousState = CurrentState;
		CurrentState = newState;
		_stateEnterTime = 0;

		OnStateChanged?.Invoke( previousState, newState );

		switch ( newState )
		{
			case EnemyState.Idle:
				agent.Stop();
				AnimationHelper.HoldType = CitizenAnimationHelper.HoldTypes.None;
				AnimationHelper.WithVelocity( Vector3.Zero );
				renderer.Set( "scale_height", 2f );
				break;
			case EnemyState.Chase:
				agent.MaxSpeed = MaxSpeed;
				AnimationHelper.HoldType = CitizenAnimationHelper.HoldTypes.Punch;
				break;
			case EnemyState.Patrol:
				agent.MaxSpeed = MaxSpeed / 4;
				break;
			case EnemyState.Death:
				EnterDeathState();
				break;
		}
	}

	private void RefreshPotentialTargets()
	{
		_potentialTargets.Clear();
		foreach ( var player in Scene.Components.GetAll<Dedugan>() )
		{
			if ( player.IsValid() && player.Health > 0 )
			{
				_potentialTargets.Add( player );
			}
		}

		_lastSearchRefresh = 0;
	}

	private void FindClosestTarget()
	{
		// Обновляем список целей при необходимости
		if ( _lastSearchRefresh > 1f ) RefreshPotentialTargets();

		Dedugan closestTarget = null;
		float closestDistance = float.MaxValue;

		foreach ( var target in _potentialTargets )
		{
			if ( !target.IsValid() || target.Health <= 0 ) continue;

			float distance = Vector3.DistanceBetween( WorldPosition, target.WorldPosition );
			if ( distance <= DetectionRadius && distance < closestDistance )
			{
				closestDistance = distance;
				closestTarget = target;
			}
			else
			{
				_currentTarget = null;
			}
		}

		// Если нашли более близкую цель, переключаемся на нее
		if ( closestTarget != null && closestTarget != _currentTarget )
		{
			_currentTarget = closestTarget;

			// Если мы в состоянии атаки/погони и цель сменилась, перезапускаем движение
			if ( CurrentState == EnemyState.Chase || CurrentState == EnemyState.Attack )
			{
				agent.MoveTo( _currentTarget.WorldPosition );
			}
		}
	}

	private bool HasValidTarget()
	{
		return _currentTarget != null &&
		       _currentTarget.IsValid() &&
		       _currentTarget.Health > 0;
	}

	private void UpdateIdleState()
	{
		if ( HasValidTarget() )
		{
			Log.Info(_currentTarget);
			SwitchState( EnemyState.Chase );
			return;
		}

		if ( new Random().Next( 0, 100 ) > 90 )
		{
			SwitchState( EnemyState.Patrol );
		}
		
		SwitchState( EnemyState.Patrol );

		AnimationHelper.WithVelocity( Vector3.Zero );
	}

	private void UpdatePatrolState()
	{
		if ( HasValidTarget() )
		{
			SwitchState( EnemyState.Chase );
			return;
		}

		if ( agent.Velocity.Length <= 10 )
		{
			agent.MoveTo( Scene.NavMesh.GetRandomPoint() ?? WorldPosition );
		}
		
		AnimationHelper.WithVelocity( agent.Velocity );
	}


	private void UpdateChaseState()
	{
		if ( !HasValidTarget() )
		{
			SwitchState( EnemyState.Idle );
			return;
		}

		float distance = Vector3.DistanceBetween( _currentTarget.WorldPosition, WorldPosition );

		if ( distance <= AttackRadius )
		{
			SwitchState( EnemyState.Attack );
			return;
		}

		if ( distance > DetectionRadius )
		{
			SwitchState( EnemyState.Idle );
			return;
		}

		agent.MoveTo( _currentTarget.WorldPosition );
		AnimationHelper.WithVelocity( agent.Velocity );
	}

	private void UpdateAttackState()
	{
		if ( !HasValidTarget() )
		{
			SwitchState( EnemyState.Idle );
			return;
		}

		float distance = Vector3.DistanceBetween( _currentTarget.WorldPosition, WorldPosition );

		if ( distance > AttackRadius )
		{
			SwitchState( EnemyState.Chase );
			return;
		}

		agent.Stop();
		AnimationHelper.WithVelocity( Vector3.Zero );

		if ( _timeSinceLastAttack >= AttackCooldown )
		{
			var dir = _currentTarget.WorldPosition - WorldPosition;
			renderer.Set( "b_attack", true );
			_timeSinceLastAttack = 0;
			_currentTarget.ReportHit( dir, 1, 15 );
			CreateHitEffects( _currentTarget.WorldPosition + _currentTarget.WorldRotation.Up * 60, dir );
		}
	}

	private void EnterDeathState()
	{
		agent.Stop();
		AnimationHelper.WithVelocity( Vector3.Zero );
		if ( RagdollController != null ) RagdollController.Enabled = true;
	}

	private void UpdateDeathState()
	{
		// Логика состояния смерти
	}

	public void Die()
	{
		SwitchState( EnemyState.Death );

		DestroyAsync( GameObject, 5f );
	}

	[Rpc.Broadcast]
	public void ReportHit( Vector3 dir, int boneIndex, int damage = 25 )
	{
		renderer.Set( "hit", true );
		renderer.Set( "hit_bone", boneIndex );
		renderer.Set( "hit_direction", dir );
		renderer.Set( "hit_offset", dir );
		renderer.Set( "hit_strength", 5 );

		Health -= damage;
		if ( Health <= 0 )
		{
			Die();
		}
	}

	[Rpc.Broadcast]
	private void CreateHitEffects( Vector3 position, Vector3 normal )
	{
		if ( HitSound != null ) HitSound.StartSound();
		if ( bloodParticle != null )
		{
			var rot = Rotation.LookAt( normal );
			DestroyAsync( bloodParticle.Clone( position, rot ), 0.5f );
		}
	}

	async void DestroyAsync( GameObject go, float delay )
	{
		await GameTask.DelaySeconds( delay );
		if ( go != null && go.IsValid() ) go.Destroy();
	}
}