From 6fc9568137601fac49efbb908837533f4212cf1f Mon Sep 17 00:00:00 2001
From: Zenny <zenayi@gmail.com>
Date: Wed, 4 Sep 2024 18:31:35 -0700
Subject: [PATCH] Random patrol

---
 src/enemy/Enemy.cs                             | 15 +++++++++++++++
 .../floating_enemy/FloatingEnemy.tscn          |  5 +++++
 src/enemy/state/EnemyLogic.Input.cs            |  7 ++++++-
 .../state/states/EnemyLogic.State.Idle.cs      | 18 +++++++++++++++++-
 4 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/src/enemy/Enemy.cs b/src/enemy/Enemy.cs
index 9a602774..482f726c 100644
--- a/src/enemy/Enemy.cs
+++ b/src/enemy/Enemy.cs
@@ -47,6 +47,8 @@ public partial class Enemy : CharacterBody3D, IEnemy, IProvide<IEnemyLogic>
 
   [Node] public Area3D LineOfSight { get; set; } = default!;
 
+  [Node] public Timer PatrolTimer { get; set; } = default!;
+
   public void Setup()
   {
     EnemyLogic = new EnemyLogic();
@@ -60,6 +62,19 @@ public partial class Enemy : CharacterBody3D, IEnemy, IProvide<IEnemyLogic>
     CurrentHP = new AutoProp<double>(EnemyStatInfo.MaximumHP);
     CurrentHP.Sync += OnHPChanged;
     LineOfSight.BodyEntered += LineOfSight_BodyEntered;
+    PatrolTimer.Timeout += OnPatrolTimeout;
+    var rng = new RandomNumberGenerator();
+    rng.Randomize();
+    PatrolTimer.WaitTime = rng.RandfRange(7.0f, 15.0f);
+  }
+
+  private void OnPatrolTimeout()
+  {
+    var rng = new RandomNumberGenerator();
+    rng.Randomize();
+    var randomizedSpot = new Vector3(rng.RandfRange(-3.0f, 3.0f), 0, rng.RandfRange(-3.0f, 3.0f));
+    EnemyLogic.Input(new EnemyLogic.Input.PatrolToRandomSpot(GlobalPosition + randomizedSpot));
+    PatrolTimer.WaitTime = rng.RandfRange(7.0f, 15.0f);
   }
 
   private void LineOfSight_BodyEntered(Node3D body)
diff --git a/src/enemy/enemy_types/floating_enemy/FloatingEnemy.tscn b/src/enemy/enemy_types/floating_enemy/FloatingEnemy.tscn
index 2f6afcfb..a100d3f4 100644
--- a/src/enemy/enemy_types/floating_enemy/FloatingEnemy.tscn
+++ b/src/enemy/enemy_types/floating_enemy/FloatingEnemy.tscn
@@ -139,3 +139,8 @@ collision_mask = 2
 [node name="CollisionShape3D" type="CollisionShape3D" parent="LineOfSight"]
 transform = Transform3D(1, 0, 0, 0, 0.0745088, 0.99722, 0, -0.99722, 0.0745088, 0, 0, -1.46944)
 shape = SubResource("CylinderShape3D_jbgmx")
+
+[node name="PatrolTimer" type="Timer" parent="."]
+unique_name_in_owner = true
+wait_time = 10.0
+autostart = true
diff --git a/src/enemy/state/EnemyLogic.Input.cs b/src/enemy/state/EnemyLogic.Input.cs
index d5feb16f..c3d0fd62 100644
--- a/src/enemy/state/EnemyLogic.Input.cs
+++ b/src/enemy/state/EnemyLogic.Input.cs
@@ -1,4 +1,7 @@
-namespace GameJamDungeon
+
+using Godot;
+
+namespace GameJamDungeon
 {
   public partial class EnemyLogic
   {
@@ -13,6 +16,8 @@
       public readonly record struct HitByPlayer(double Damage);
 
       public readonly record struct Killed();
+
+      public readonly record struct PatrolToRandomSpot(Vector3 PatrolTarget);
     }
   }
 }
diff --git a/src/enemy/state/states/EnemyLogic.State.Idle.cs b/src/enemy/state/states/EnemyLogic.State.Idle.cs
index 8d6f7c77..74564941 100644
--- a/src/enemy/state/states/EnemyLogic.State.Idle.cs
+++ b/src/enemy/state/states/EnemyLogic.State.Idle.cs
@@ -8,7 +8,7 @@ public partial class EnemyLogic
   public partial record State
   {
     [Meta, Id("enemy_logic_state_idle")]
-    public partial record Idle : Alive, IGet<Input.Alerted>, IGet<Input.PhysicsTick>
+    public partial record Idle : Alive, IGet<Input.Alerted>, IGet<Input.PhysicsTick>, IGet<Input.PatrolToRandomSpot>
     {
       public Transition On(in Input.Alerted _)
       {
@@ -20,6 +20,22 @@ public partial class EnemyLogic
         var delta = input.Delta;
         var gameRepo = Get<IGameRepo>();
         var enemy = Get<IEnemy>();
+
+        var nextPosition = enemy.NavAgent.GetNextPathPosition();
+        var lookAtPos = enemy.NavAgent.GetNextPathPosition();
+
+        var direction = enemy.NavAgent.GetNextPathPosition() - enemy.GlobalPosition;
+        enemy.Velocity = enemy.Velocity.MoveToward(direction.Normalized() * 0.01f, (float)delta);
+
+        Output(new Output.MovementComputed(enemy.Velocity));
+        return ToSelf();
+      }
+
+      public Transition On(in Input.PatrolToRandomSpot input)
+      {
+        var enemy = Get<IEnemy>();
+        enemy.NavAgent.TargetPosition = input.PatrolTarget;
+        enemy.LookAt(new Vector3(input.PatrolTarget.X, enemy.GlobalPosition.Y, input.PatrolTarget.Z), Vector3.Up);
         return ToSelf();
       }
     }