using UnityEngine;
using UnityEngine.UI;

public class CanvasAutoAdapter : MonoBehaviour
{
    public Canvas canvas;
    public CanvasScaler canvasScaler;
    public RectTransform safeAreaPanel; // 处理 Safe Area 适配的 UI 根对象

    void Start()
    {
        if (canvas == null)
            canvas = GetComponent<Canvas>();
        if (canvasScaler == null)
            canvasScaler = GetComponent<CanvasScaler>();

        ApplyCanvasScalerSettings();
        ApplySafeArea();
    }

    void ApplyCanvasScalerSettings()
    {
        if (canvasScaler == null) return;

        float screenRatio = (float)Screen.width / Screen.height; // 当前设备宽高比
        float referenceRatio = 1280f / 720f; // 游戏原始分辨率的宽高比

        if (screenRatio > referenceRatio)
        {
            // 设备比参考宽，调整高度适配
            canvasScaler.matchWidthOrHeight = 1.0f;
        }
        else
        {
            // 设备比参考窄，调整宽度适配
            canvasScaler.matchWidthOrHeight = 0.0f;
        }

        Debug.Log($"Screen Ratio: {screenRatio}, Match Mode: {canvasScaler.matchWidthOrHeight}");
    }

    void ApplySafeArea()
    {
        if (safeAreaPanel == null) return;

        Rect safeArea = Screen.safeArea;
        Vector2 anchorMin = safeArea.position;
        Vector2 anchorMax = safeArea.position + safeArea.size;

        anchorMin.x /= Screen.width;
        anchorMin.y /= Screen.height;
        anchorMax.x /= Screen.width;
        anchorMax.y /= Screen.height;

        safeAreaPanel.anchorMin = anchorMin;
        safeAreaPanel.anchorMax = anchorMax;

        Debug.Log($"Safe Area Applied: {safeArea}");
    }

    //void Update()
    //{
    //    // 监听屏幕旋转或窗口大小变化
    //    if (Screen.width != lastScreenWidth || Screen.height != lastScreenHeight)
    //    {
    //        lastScreenWidth = Screen.width;
    //        lastScreenHeight = Screen.height;
    //        ApplyCanvasScalerSettings();
    //        ApplySafeArea();
    //    }
    //}

    private int lastScreenWidth, lastScreenHeight;
}