Feature/add stars renderer (#70)

Co-authored-by: Djelal BOUDJI <djelal@gmail.com>

Assets/Scripts/SelectDifficulty.cs

@@ -0,0 +1,76 @@
+using UnityEngine;
+using UnityEngine.UI;
+
+public class SelectDifficulty : MonoBehaviour
+{
+    public GameObject selectDifficultyPanel;
+    public GameObject mainSaveButton;
+    public StarsRenderer starsRenderer;
+    public JSONExporter jsonExporter;
+
+    private int currentDifficulty;
+    private const int MinDiff = 1;
+    private const int MaxDiff = 5;
+
+    void Awake()
+    {
+        if (selectDifficultyPanel == null)
+        {
+            selectDifficultyPanel = GameObject.Find("SelectDifficultyPanel");
+        }
+        if (mainSaveButton == null)
+        {
+            mainSaveButton = GameObject.Find("MainSaveButton");
+        }
+    }
+
+    void Start()
+    {
+        currentDifficulty = starsRenderer != null
+            ? starsRenderer.GetCurrentDifficulty()
+            : MinDiff;
+        currentDifficulty = Mathf.Clamp(currentDifficulty, MinDiff, MaxDiff);
+
+        UpdateUI();
+    }
+
+    private void UpdateUI()
+    {
+        starsRenderer.UseAutomaticMode();
+        starsRenderer?.SetManualDifficulty(currentDifficulty);
+    }
+
+    public void OpenSelectDifficulty()
+    {
+        selectDifficultyPanel.SetActive(true);
+        mainSaveButton.SetActive(false);
+        UpdateUI();
+    }
+
+
+    public void PreviousDifficulty()
+    {
+        Debug.Log("PreviousDifficulty called");
+        if (currentDifficulty > MinDiff)
+        {
+            currentDifficulty--;
+            UpdateUI();
+        }
+    }
+
+    public void NextDifficulty()
+    {
+        Debug.Log("NextDifficulty called");
+        if (currentDifficulty < MaxDiff)
+        {
+            currentDifficulty++;
+            UpdateUI();
+        }
+    }
+
+    public void Cancel()
+    {
+        selectDifficultyPanel.SetActive(false);
+        mainSaveButton.SetActive(true);
+    }
+}