using UnityEngine;
using PhxhSDK;

/// <summary>
/// 刘海屏适配器，负责处理屏幕适配逻辑
/// 使用组合模式，从UIWindow中提取出屏幕适配功能
/// </summary>
public class UINotchScreenAdapter
{
    private Transform _rootTransform;
    private ScreenOrientation _lastOrientation;
    private Vector2 _offsets; // x,y代表左右的偏移量
    private GameObject _goLeft;
    private GameObject _goRight;
    
    // 默认的左右刘海屏节点名称
    private const string LEFT_NOTCH_NODE_NAME = "UI_LiuHaiLeft";
    private const string RIGHT_NOTCH_NODE_NAME = "UI_LiuHaiRight";

    /// <summary>
    /// 构造函数，创建时自动初始化屏幕适配
    /// </summary>
    /// <param name="rootTransform">需要进行适配的根节点Transform</param>
    public UINotchScreenAdapter(Transform rootTransform)
    {
        _rootTransform = rootTransform;
        _lastOrientation = Screen.orientation;
        InitScreenUIOffset();
        UpdateScreenAdaption();
    }

    /// <summary>
    /// 更新检查，需要在Update中调用
    /// </summary>
    public void UpdateCheck()
    {
        if (_lastOrientation != Screen.orientation)
        {
            // 屏幕方向发生变化时更新适配
            _lastOrientation = Screen.orientation;
            UpdateScreenAdaption();
        }
    }

    /// <summary>
    /// 屏幕适配，目前方案是左右固定名称的节点下的各个物体需要适配，其他的不管
    /// </summary>
    private void UpdateScreenAdaption()
    {
        if (_goLeft)
        {
            var rectTrans = _goLeft.GetComponent<RectTransform>();
            var originPos = rectTrans.anchoredPosition;
            rectTrans.anchoredPosition = new Vector2(_offsets.x, originPos.y);
        }

        if (_goRight)
        {
            var rectTrans = _goRight.GetComponent<RectTransform>();
            var originPos = rectTrans.anchoredPosition;
            rectTrans.anchoredPosition = new Vector2(_offsets.y, originPos.y);
        }
    }

    /// <summary>
    /// 设置屏幕偏移量
    /// </summary>
    /// <param name="offset">偏移量</param>
    private void SetScreenOffsets(Vector2 offset)
    {
        _offsets = offset;
    }

    /// <summary>
    /// 初始化屏幕UI偏移量
    /// </summary>
    private void InitScreenUIOffset()
    {
        var offset = DeviceHelper.GetWidthOffset();
        _goLeft = _rootTransform.Find(LEFT_NOTCH_NODE_NAME)?.gameObject;
        if (_goLeft)
        {
            var rectTrans = _goLeft.GetComponent<RectTransform>();
            var originPos = rectTrans.anchoredPosition;
            SetScreenOffsets(new Vector2(originPos.x + offset.x, 0));
        }

        _goRight = _rootTransform.Find(RIGHT_NOTCH_NODE_NAME)?.gameObject;
        if (_goRight)
        {
            var rectTrans = _goRight.GetComponent<RectTransform>();
            var originPos = rectTrans.anchoredPosition;
            SetScreenOffsets(new Vector2(_offsets.x, originPos.x - offset.y));
        }
    }

    /// <summary>
    /// 获取当前的屏幕偏移量
    /// </summary>
    /// <returns>偏移量</returns>
    public Vector2 GetCurrentOffsets()
    {
        return _offsets;
    }
}