Enemy state machine

Scripts/Components/FSM/Enemy/Alert.cs

@@ -0,0 +1,105 @@
+using Cirno.Scripts.Components.Actors;
+using Cirno.Scripts.Enums;
+using Godot;
+
+namespace Cirno.Scripts.Components.FSM.Enemy;
+
+public partial class Alert : EnemyStateBase
+{
+    public override EnemyState StateId => EnemyState.Alert;
+
+    [Export]
+    public EnemyStorageModule StorageModule { get; private set; }
+    
+    [Export]
+    public PlayerDetectionModule PlayerDetection { get; private set; }
+    
+    [Export]
+    public GenericDamageReceiver DamageReceiver { get; private set; }
+    
+    private bool _isPlayerInRange = false;
+    
+    public override void EnterState()
+    {
+        base.EnterState();
+        GD.Print("Entered Idle");
+        PlayerDetection.SetRange(StorageModule.Root.EnemyResource.PlayerDetectionRange);
+        
+        _isPlayerInRange = PlayerDetection.IsPlayerInRange(StorageModule.Root.EnemyResource.PlayerDetectionRange);
+        
+        PlayerDetection.PlayerInRange += PlayerDetectionOnPlayerInRange;
+        
+        PlayerDetection.PlayerOutOfRange += PlayerDetectionOnPlayerOutOfRange;
+
+        DamageReceiver.ChangeState(true);
+        
+        DamageReceiver.HealthProvider.ResourceDepleted += HealthProviderOnResourceDepleted;
+        
+    }
+
+
+    private void HealthProviderOnResourceDepleted()
+    {
+        ChangeState(EnemyState.Dead);
+    }
+
+    private void PlayerDetectionOnPlayerOutOfRange()
+    {
+        _isPlayerInRange = false;
+        GD.Print("Player out of range");
+    }
+
+    public override void ExitState()
+    {
+        base.ExitState();
+        GD.Print("Exited Idle");
+        PlayerDetection.PlayerInRange -= PlayerDetectionOnPlayerInRange;
+        
+        PlayerDetection.PlayerOutOfRange -= PlayerDetectionOnPlayerOutOfRange;
+        
+        DamageReceiver.HealthProvider.ResourceDepleted -= HealthProviderOnResourceDepleted;
+        DamageReceiver.ChangeState(false);
+        
+    }
+
+    private void PlayerDetectionOnPlayerInRange()
+    {
+        _isPlayerInRange = true;
+        GD.Print("Player In Range");
+    }
+
+    public override void PhysicsProcessState(double delta)
+    {
+        base.PhysicsProcessState(delta);
+        if (_isPlayerInRange && PlayerDetection.IsPlayerInSight())
+        {
+            StateMachine.SetState(EnemyState.Shooting);
+            return;
+        }
+        
+        // if player is outside disengage range, change to idle (later on, search)
+        if (this.GlobalPosition.DistanceTo(GameManager.Instance.PlayerPosition.Value) >=
+            StorageModule.Root.EnemyResource.PlayerDisengageRange)
+        {
+            StateMachine.SetState(EnemyState.Idle);
+        }
+        
+        // Move towards last known position
+        if (PlayerDetection.LastKnownPlayerPosition.HasValue)
+        {
+            MoveTowardsPosition(PlayerDetection.LastKnownPlayerPosition.Value);
+        }
+            
+        
+    }
+
+    private void MoveTowardsPosition(Vector2 position)
+    {
+        
+    }
+
+    public override void ProcessState(double delta)
+    {
+        base.ProcessState(delta);
+    }
+}