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;
    [Export] public int MaxHealth = 100;
    [Export] public bool ShowDamageNumbers = true;
    
    private Player _player;
    private float _attackTimer = 0;
    private bool _isPlayerInRange = false;
    private Area2D _detectionArea;
    private int _currentHealth;
    private ProgressBar _healthBar;
    
    public int CurrentHealth
    {
        get => _currentHealth;
        private set
        {
            _currentHealth = Mathf.Clamp(value, 0, MaxHealth);
            UpdateHealthBar();
            
            if (_currentHealth <= 0)
            {
                Die();
            }
        }
    }
    
    public bool IsDead => _currentHealth <= 0;

    public override void _Ready()
    {
        _currentHealth = MaxHealth;
        
        // Create health bar
        _healthBar = new ProgressBar
        {
            MaxValue = MaxHealth,
            Value = _currentHealth,
            Size = new Vector2(40, 4),
            ShowPercentage = false,
            Visible = false
        };
        
        var healthBarContainer = new Control();
        healthBarContainer.AddChild(_healthBar);
        AddChild(healthBarContainer);
        healthBarContainer.Position = new Vector2(-20, -20); // Adjust position as needed
        
        // 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 (IsDead) return;
        
        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();
        }
    }
    
    public void TakeDamage(int damage, Vector2? hitPosition = null)
    {
        if (IsDead) return;
        
        CurrentHealth -= damage;
        
        // Show damage number (optional)
        if (ShowDamageNumbers)
        {
            var damageLabel = new Label
            {
                Text = $"-{damage}",
                Position = hitPosition ?? GlobalPosition,
                ZIndex = 1000
            };
            
            GetTree().CurrentScene.AddChild(damageLabel);
            
            // Animate and remove damage number
            var tween = CreateTween();
            tween.TweenProperty(damageLabel, "position:y", damageLabel.Position.Y - 30, 0.5f);
            tween.TweenCallback(Callable.From(() => damageLabel.QueueFree())).SetDelay(0.5f);
        }
        
        // Visual feedback
        var originalModulate = Modulate;
        Modulate = new Color(1, 0.5f, 0.5f); // Flash red
        
        var tweenFlash = CreateTween();
        tweenFlash.TweenProperty(this, "modulate", originalModulate, 0.2f);
    }
    
    private void UpdateHealthBar()
    {
        if (_healthBar != null)
        {
            _healthBar.Value = _currentHealth;
            _healthBar.Visible = _currentHealth < MaxHealth; // Only show when damaged
        }
    }
    
    private void Die()
    {
        // Play death animation/sound
        // You can add a death animation here
        
        // Disable collisions and hide
        SetProcess(false);
        SetPhysicsProcess(false);
        Hide();
        
        // Queue free after a delay (for any death animation/sound to play)
        var timer = new Timer();
        AddChild(timer);
        timer.Timeout += () => QueueFree();
        timer.Start(0.5f);
    }
    
    private void TryAttackPlayer(double delta)
    {
        if (IsDead) return;
        
        _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;
        }
    }
}