AceField-New-Horizon/Scripts/Entities/Enemy.cs

using Godot;

namespace AceFieldNewHorizon.Scripts.Entities;

public partial class Enemy : CharacterBody2D
{
    public const string EnemyGroupName = "Enemy";
    
    [Export] public float MoveSpeed = 150.0f;
    [Export] public float DetectionRadius = 300.0f;
    [Export] public float AttackRange = 50.0f;
    [Export] public int Damage = 10;
    [Export] public float AttackCooldown = 1.0f;
    
    private Player _player;
    private float _attackTimer = 0;
    private bool _isPlayerInRange = false;
    private Area2D _detectionArea;
    
    public override void _Ready()
    {
        // Create detection area
        _detectionArea = new Area2D();
        var collisionShape = new CollisionShape2D();
        var shape = new CircleShape2D();
        shape.Radius = DetectionRadius;
        collisionShape.Shape = shape;
        _detectionArea.AddChild(collisionShape);
        AddChild(_detectionArea);
        
        // Connect signals
        _detectionArea.BodyEntered += OnBodyEnteredDetection;
        _detectionArea.BodyExited += OnBodyExitedDetection;
        
        AddToGroup(EnemyGroupName);
    }
    
    public override void _Process(double delta)
    {
        if (_player != null && _isPlayerInRange)
        {
            // Face the player
            LookAt(_player.GlobalPosition);
            
            // Move towards player if not in attack range
            var direction = GlobalPosition.DirectionTo(_player.GlobalPosition);
            var distance = GlobalPosition.DistanceTo(_player.GlobalPosition);
            
            if (distance > AttackRange)
            {
                Velocity = direction * MoveSpeed;
            }
            else
            {
                Velocity = Vector2.Zero;
                TryAttackPlayer(delta);
            }
            
            MoveAndSlide();
        }
    }
    
    private void TryAttackPlayer(double delta)
    {
        _attackTimer += (float)delta;
        
        if (_attackTimer >= AttackCooldown)
        {
            _attackTimer = 0;
            // Here you can implement the attack logic
            // For example: _player.TakeDamage(Damage);
            GD.Print("Enemy attacks player!");
        }
    }
    
    private void OnBodyEnteredDetection(Node2D body)
    {
        if (body is Player player)
        {
            _player = player;
            _isPlayerInRange = true;
        }
    }
    
    private void OnBodyExitedDetection(Node2D body)
    {
        if (body == _player)
        {
            _isPlayerInRange = false;
            Velocity = Vector2.Zero;
        }
    }
}