using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class StarRating : MonoBehaviour
{
    [Header("星星設定")]
    public Button[] stars;
    public Sprite starGray;
    public Sprite starYellow;

    private int currentRating = 0;

    void Start()
    {
        Debug.Log("=== " + gameObject.name + " 開始初始化 ===");

        // 檢查 EventSystem
        EventSystem eventSystem = FindObjectOfType<EventSystem>();
        if (eventSystem == null)
        {
            Debug.LogError("場景中沒有 EventSystem！");
        }
        else
        {
            Debug.Log("EventSystem 存在: " + eventSystem.name);
        }

        // 檢查圖片
        if (starGray == null)
        {
            Debug.LogError(gameObject.name + ": 灰色星星圖片沒有指派！");
        }
        else
        {
            Debug.Log("灰色星星圖片已指派");
        }

        if (starYellow == null)
        {
            Debug.LogError(gameObject.name + ": 黃色星星圖片沒有指派！");
        }
        else
        {
            Debug.Log("黃色星星圖片已指派");
        }

        Debug.Log("星星陣列大小: " + stars.Length);

        // 初始化每顆星星
        for (int i = 0; i < stars.Length; i++)
        {
            if (stars[i] == null)
            {
                Debug.LogError("星星 " + i + " 沒有被指派！");
                continue;
            }

            int starIndex = i + 1;

            // 設定初始圖片
            Image starImage = stars[i].GetComponent<Image>();
            if (starImage != null && starGray != null)
            {
                starImage.sprite = starGray;
                starImage.raycastTarget = true;
                Debug.Log("星星 " + starIndex + " 圖片設定完成，Raycast Target = " + starImage.raycastTarget);
            }

            // 檢查 Button
            Button button = stars[i].GetComponent<Button>();
            if (button != null)
            {
                button.interactable = true;

                Debug.Log("星星 " + starIndex + " Button 檢查:");
                Debug.Log(" - Interactable: " + button.interactable);
                Debug.Log(" - GameObject active: " + stars[i].gameObject.activeInHierarchy);

                // 清除舊的監聽器
                button.onClick.RemoveAllListeners();

                // 添加新的監聽器
                int clickedIndex = starIndex;
                // 使用 Lambda 表達式確保正確傳遞索引值
                button.onClick.AddListener(() => { OnStarClicked(clickedIndex); });

                Debug.Log("星星 " + starIndex + " 點擊事件已綁定");
            }
            else
            {
                Debug.LogError("星星 " + starIndex + " 沒有 Button 組件！");
            }
        }

        Debug.Log("=== " + gameObject.name + " 初始化結束 ===");
    }

    // *** 移除的 Update 函數原本在這裡，它導致了 InvalidOperationException 錯誤 ***
    // 因為按鈕的點擊事件已經在 Start() 中綁定，故此 Update 函數不需要。

    void OnStarClicked(int starIndex)
    {
        Debug.Log("========================================");
        Debug.Log("!!! " + gameObject.name + " 的星星 " + starIndex + " 被點擊 !!!");
        Debug.Log("========================================");
        SetRating(starIndex);
    }

    public void SetRating(int rating)
    {
        Debug.Log(">>> 設定評分: " + rating + " 顆星");
        currentRating = rating;
        UpdateStarDisplay();
    }

    void UpdateStarDisplay()
    {
        Debug.Log(">>> 開始更新星星顯示，目標評分: " + currentRating);

        for (int i = 0; i < stars.Length; i++)
        {
            if (stars[i] == null) continue;

            Image starImage = stars[i].GetComponent<Image>();
            if (starImage != null)
            {
                if (i < currentRating)
                {
                    if (starYellow != null)
                    {
                        starImage.sprite = starYellow;
                        Debug.Log(">>> 星星 " + (i+1) + " 更換為黃色圖片");
                    }
                    else
                    {
                        Debug.LogError("黃色星星圖片是 null！");
                    }
                }
                else
                {
                    if (starGray != null)
                    {
                        starImage.sprite = starGray;
                        Debug.Log(">>> 星星 " + (i+1) + " 保持灰色圖片");
                    }
                    else
                    {
                        Debug.LogError("灰色星星圖片是 null！");
                    }
                }
            }
        }

        Debug.Log(">>> 星星顯示更新完成！");
    }

    public int GetRating()
    {
        return currentRating;
    }

    public void ResetRating()
    {
        currentRating = 0;
        UpdateStarDisplay();
    }
}