Feature: Hearts to track player lives

Added:
- Lives for the player
- Hearts to show the player how many lives they have
- Quits on 0 lives
Changed:
- Refactored code for easier maintainance
    - Better variable names
    - Easier to read conditions
    - Subroutines to handle specific logic

Assets/Heart.png.meta

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Assets/Scenes/SampleScene.unity

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+--- !u!82 &932053744
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   m_Name: Player
-  m_TagString: Untagged
+  m_TagString: Player
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-  rb: {fileID: 1261174834}
-  drag: 3
-  orientation: {fileID: 1261174833}
-  speed: 5
   forwardKey: 44
   backwardKey: 111
   leftKey: 97
   rightKey: 101
+  speed: 5
+  moveDirection: {x: 0, y: 0, z: 0}
+  rb: {fileID: 1261174834}
+  invulnerabilityTimeSeconds: 1.92
+  lastHit: 0
+  metalPipe: {fileID: 932053744}
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   - component: {fileID: 3385535184014867850}
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   m_Name: Enemy
-  m_TagString: Untagged
+  m_TagString: Enemy
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   m_StaticEditorFlags: 0
@@ -1014,6 +1141,19 @@ MonoBehaviour:
   speed: 1
   range: 4
   enemy: {fileID: 2715678257314441011}
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Assets/Scripts/PlayerController.cs

@@ -1,8 +1,9 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.ComponentModel;
 using UnityEngine;
+using UnityEngine.UI;
+#if UNITY_EDITOR
+using UnityEditor;
+#endif
+
 
 public class PlayerController : MonoBehaviour
 {
@@ -15,42 +16,82 @@ public class PlayerController : MonoBehaviour
     [Header("Speed")]
     public float speed = 5;
 
-    [Header("Player Object")]
-    public Vector3 moveDirection;
-    public Rigidbody rb;
+    [Header("Lives")]
+    public string enemyTag = "Enemy";
+    public float invulnerabilityTimeSeconds = 0.25f;
+    public float lastHit = 0;
+    public int lives = 3;
+    public GameObject[] hearts;
 
     [Header("Audio")]
     public AudioSource metalPipe;
 
+    [Header("Player Object")]
+    public Vector3 moveDirection;
+    public Rigidbody rb;
+
     
     void Start()
     {
-        rb = GetComponent<Rigidbody>();
-        rb.freezeRotation = true;
+        if (hearts.Length != 3)
+        {
+            Debug.LogError("Hearts array not properly configured. Expected length 3.");
+            enabled = false;
+            return;
+        }
+
+        if (!TryGetComponent(out rb))
+        {
+            Debug.LogError("Rigidbody not found!");
+            enabled = false; // Disable script if Rigidbody is missing.
+        }
+        else
+        {
+            rb.freezeRotation = true;
+        }
     }
 
     void Update()
     {
         moveDirection = PlayerInput();
-
         rb.velocity = moveDirection.normalized * speed;
     }
 
     Vector3 PlayerInput()
     {
-        float forward  = Convert.ToSingle(Input.GetKey(forwardKey));
-        float backward = Convert.ToSingle(Input.GetKey(backwardKey));
-        float right    = Convert.ToSingle(Input.GetKey(rightKey));
-        float left     = Convert.ToSingle(Input.GetKey(leftKey));
-        return new Vector3(right - left, 0, forward - backward);
+        Vector3 direction = Vector3.zero;
+
+        if (Input.GetKey(rightKey)) direction.x += 1f;
+        if (Input.GetKey(leftKey)) direction.x -= 1f;
+        if (Input.GetKey(forwardKey)) direction.z += 1f;
+        if (Input.GetKey(backwardKey)) direction.z -= 1f;
+
+        return direction;
     }
 
+
     void OnCollisionEnter(Collision collision)
     {
-        if (collision.gameObject.name == "Enemy")
+        bool collidedWithEnemy = collision.gameObject.tag == enemyTag;
+        bool isInvulnerable = invulnerabilityTimeSeconds >= Time.time - lastHit;
+        if (collidedWithEnemy && !isInvulnerable)
         {
-            Debug.Log("OWIE");
+            lastHit = Time.time;
             metalPipe.Play();
+
+            lives--;
+            hearts[lives].GetComponent<RawImage>().color = Color.gray;
+
+            bool playerOutOfLives = lives == 0;
+            if (playerOutOfLives) ExitGame();
         }
     }
+
+    void ExitGame()
+    {
+        #if UNITY_EDITOR
+            EditorApplication.ExitPlaymode();
+        #endif
+            Application.Quit();
+    }
 }

ProjectSettings/TagManager.asset

@@ -3,7 +3,8 @@
 --- !u!78 &1
 TagManager:
   serializedVersion: 2
-  tags: []
+  tags:
+  - Enemy
   layers:
   - Default
   - TransparentFX