implemented player health, knockback, invicibility frames and hitstop

player_controller/Scripts/PlayerController.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using Godot;
 using GodotStateCharts;
 using Movementtests.addons.godot_state_charts.csharp;
@@ -9,7 +11,9 @@ using RustyOptions;
 
 public partial class PlayerController : CharacterBody3D, 
 	IDamageable, 
-	IDamageDealer
+	IDamageDealer,
+	IHealthable,
+	IKnockbackable
 {
 	// Enums
 	public enum AllowedInputs
@@ -68,8 +72,7 @@ public partial class PlayerController : CharacterBody3D,
 	[ExportGroup("Damage")]
 	[Export]
 	public RDamage RDamage { get; set; }
-	[Export]
-	public CDamageable CDamage { get; set; }
+	public Node CDamageable { get; set; }
 	
 	[ExportCategory("Movement")]
 	[ExportGroup("Ground")]
@@ -279,6 +282,8 @@ public partial class PlayerController : CharacterBody3D,
 	private Timer _simpleDashCooldownTimer;
 	private Timer _airborneDashCooldownTimer;
 	private Timer _powerCooldownTimer;
+	private Timer _invincibilityTimer;
+	private Timer _attackCooldown;
 	
 	// State chart
 	private StateChart       _playerState;
@@ -316,6 +321,8 @@ public partial class PlayerController : CharacterBody3D,
 	
 	private Transition       _onGroundSlideJump;
 	private Transition       _onAirGlideDoubleJump;
+	
+	private List<IDamageable> _hitEnemies = new List<IDamageable>();
 
 	public override void _Ready()
 	{
@@ -366,8 +373,29 @@ public partial class PlayerController : CharacterBody3D,
 		var playerShape = StandingCollider.GetShape() as CapsuleShape3D;
 		_playerHeight = playerShape!.Height;
 		_playerRadius = playerShape.Radius;
-
+		
+		// Combat stuff
 		WeaponHitbox = GetNode<Area3D>("%WeaponHitbox");
+		WeaponHitbox.Monitoring = false;
+		WeaponHitbox.BodyEntered += RegisterHitEnnemy;
+		
+		CHealth = GetNode<Node>("CHealth");
+		if (CHealth is IHealthable healthable && RHealth != null)
+		{
+			healthable.RHealth = RHealth;
+			healthable.CurrentHealth = RHealth.StartingHealth;
+		}
+		CKnockback = GetNode<Node>("CKnockback");
+		if (CKnockback is IKnockbackable knockbackable && RKnockback != null) knockbackable.RKnockback = RKnockback;
+		CDamageable = GetNode<Node>("CDamageable");
+		
+		if (CDamageable is IDamageable damageable)
+		{
+			damageable.DamageTaken += ReduceHealth;
+			damageable.DamageTaken += RegisterKnockback;
+		}
+		if (CHealth is IHealthable healthable2) 
+			healthable2.HealthDepleted += Kill;
 		
 		// State management
 		_playerState = StateChart.Of(GetNode("StateChart"));
@@ -412,6 +440,8 @@ public partial class PlayerController : CharacterBody3D,
 		_timeScaleAimInAirTimer = GetNode<Timer>("TimeScaleAimInAir");
 		_simpleDashCooldownTimer = GetNode<Timer>("DashCooldown");
 		_airborneDashCooldownTimer = GetNode<Timer>("AirborneDashCooldown");
+		_invincibilityTimer = GetNode<Timer>("InvincibilityTime");
+		_attackCooldown = GetNode<Timer>("AttackCooldown");
 		
 		///////////////////////////
 		// Initialize components //
@@ -419,6 +449,8 @@ public partial class PlayerController : CharacterBody3D,
 
 		// Camera stuff
 		HeadSystem.Init();
+		HeadSystem.HitboxActivated += OnHitboxActivated;
+		HeadSystem.HitboxDeactivated += OnHitboxDeactivated;
 		
 		// Movement stuff
 		// Getting universal setting from GODOT editor to be in sync
@@ -437,6 +469,9 @@ public partial class PlayerController : CharacterBody3D,
 		///////////////////////////
 		// Signal setup ///////////
 		///////////////////////////
+		_invincibilityTimer.Timeout += ResetInvincibility;
+		_attackCooldown.Timeout += ResetAttackCooldown;
+		
 		_aiming.StatePhysicsProcessing += HandleAiming;
 		_aiming.StateEntered += OnAimingEntered;
 		_aiming.StateExited += ResetTimeScale;
@@ -1267,6 +1302,7 @@ public partial class PlayerController : CharacterBody3D,
 	///////////////////////////
 	
 	private bool _isSlideInputDown = false;
+
 	public void OnInputSlideStarted()
 	{
 		_isSlideInputDown = true;
@@ -1701,6 +1737,7 @@ public partial class PlayerController : CharacterBody3D,
 		if (_currentInputBufferFrames > 0) _currentInputBufferFrames -= 1;
 		
 		LookAround(delta);
+		Velocity += ComputeKnockback();
 		MoveSlideAndHandleStairs((float) delta);
 		MantleSystem.ProcessMantle(_grounded.Active);
 		
@@ -1719,8 +1756,17 @@ public partial class PlayerController : CharacterBody3D,
 
 	public DamageRecord TakeDamage(DamageRecord damageRecord)
 	{
-		var finalDamage = CDamage.TakeDamage(damageRecord);
+		if (CDamageable is not IDamageable damageable || _isInvincible) 
+			return damageRecord with { Damage = new RDamage(0, damageRecord.Damage.DamageType) };
+		
+		var finalDamage = damageable.TakeDamage(damageRecord);
 		DamageTaken?.Invoke(this, finalDamage);
+		
+		TriggerHitstop();
+		
+		_isInvincible = true;
+		_invincibilityTimer.Start();
+		
 		return finalDamage;
 	}
 	
@@ -1735,18 +1781,99 @@ public partial class PlayerController : CharacterBody3D,
 		}
 
 		if (!WeaponSystem.InHandState.Active) return;
+		if (!_canAttack) return;
+		
+		_canAttack = false;
+		_attackCooldown.Start();
 		PerformHit();
 	}
 
+	public void ResetAttackCooldown()
+	{
+		_canAttack = true;
+	}
+
 	public void PerformHit()
 	{
 		HeadSystem.OnHit();
+	}
+	
+	public void OnHitboxActivated()
+	{
+		WeaponHitbox.Monitoring = true;
+	}
+	public void OnHitboxDeactivated()
+	{
+		WeaponHitbox.Monitoring = false;
+		TriggerDamage();
+	}
+
+	public void RegisterHitEnnemy(Node3D body)
+	{
+		if (body is not IDamageable damageable) return;
+		_hitEnemies.Add(damageable);
+	}
+
+	public void TriggerDamage()
+	{
+		if (_hitEnemies.Count == 0) return;
 		
-		var bodies = WeaponHitbox.GetOverlappingBodies();
-		foreach (var body in bodies)
+		foreach (var damageable in _hitEnemies)
 		{
-			if(body is IDamageable spawnable) 
-				spawnable.TakeDamage(new DamageRecord(this, RDamage));
+			damageable.TakeDamage(new DamageRecord(this, RDamage));
 		}
+		_hitEnemies.Clear();
+		TriggerHitstop();
+	}
+
+	public void TriggerHitstop()
+	{
+		Engine.SetTimeScale(0.01);
+		var timer = GetTree().CreateTimer(0.1, true, false, true);
+		timer.Timeout += OnHitstopEnded;
+	}
+
+	public void OnHitstopEnded()
+	{
+		ResetTimeScale();
+	}
+
+	public Node CHealth { get; set; }
+	public Node CKnockback { get; set; }
+	
+	public event Action<IHealthable, float> HealthChanged;
+	public event Action<IHealthable> HealthDepleted;
+	public RHealth RHealth { get; set; }
+	public float CurrentHealth { get; set; }
+	public void ReduceHealth(IDamageable source, DamageRecord damageRecord)
+	{
+		if (CHealth is not IHealthable healthable) return;
+		healthable.ReduceHealth(source, damageRecord);
+		HealthChanged?.Invoke(this, healthable.CurrentHealth);
+	}
+
+	public RKnockback RKnockback { get; set; }
+	public void RegisterKnockback(IDamageable source, DamageRecord damageRecord)
+	{
+		if (CKnockback is not IKnockbackable knockbackable) return;
+		knockbackable.RegisterKnockback(source, damageRecord);
+	}
+
+	public Vector3 ComputeKnockback()
+	{
+		if (CKnockback is not IKnockbackable knockbackable) return Vector3.Zero;
+		return knockbackable.ComputeKnockback();
+	}
+
+	public void Kill(IHealthable source)
+	{
+		GD.Print("Player died!");
+	}
+
+	private bool _isInvincible;
+	private bool _canAttack = true;
+	public void ResetInvincibility()
+	{
+		_isInvincible = false;
 	}
 }