using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System.Collections.Generic;
using FairyGUI;
using Roy;

public class UIScreenTapTrigger : SingletonMonoBehaviour<UIScreenTapTrigger>
{
    public Canvas canvas; // 目标 Canvas
    private GraphicRaycaster raycaster;
    private EventSystem eventSystem;

    private RectTransform _canvasRect;
    private float _scaleX, _scaleY;

    private float _ignoreY;

    private void Start()
    {
        // 获取 Canvas 上的 GraphicRaycaster 和 EventSystem
        raycaster = canvas.GetComponent<GraphicRaycaster>();
        eventSystem = EventSystem.current;
        
        _canvasRect = canvas.GetComponent<RectTransform>();
        
        // 分别计算 X 和 Y 方向的缩放因子
        _scaleX = Screen.width / _canvasRect.sizeDelta.x;
        _scaleY = Screen.height / _canvasRect.sizeDelta.y;
        
    }

    public void SetIgnoreY(float ignoreY)
    {
        _ignoreY = ignoreY;
    }
    
    // 将 iOS 的比例坐标转换为 Unity 坐标
    private Vector2 ConvertToUnityPosition(Vector2 ratioPosition)
    {

        // Debug.LogError($"转换canvasRect size{_canvasRect.sizeDelta.x}, {_canvasRect.sizeDelta.y} ");
        // Debug.LogError($"转换screen{Screen.width}x{Screen.height} 当前scale{_scaleX}x{_scaleY}" );
        // 计算屏幕坐标并翻转 Y 轴
        float x = ratioPosition.x * _canvasRect.sizeDelta.x * _scaleX;
        float y = (1 - ratioPosition.y) * _canvasRect.sizeDelta.y * _scaleY;
    
        return new Vector2(x, y);
    }


    // 检测特定屏幕坐标的 UI 按钮并触发
    public bool TriggerButtonAtScreenPosition(Vector2 screenPosition)
    {
        // Debug.LogError($"转换前比例{screenPosition}");
        screenPosition = ConvertToUnityPosition(screenPosition);

        if (screenPosition.y < _ignoreY)
        {
            Debug.LogError($"TouchClickPoint 忽略当前高度{screenPosition.y}  限制范围Y{_ignoreY}");
            return false;
        }
        // Debug.LogError($"转换后坐标{screenPosition}");
        // 设置射线检测的事件数据
        PointerEventData pointerEventData = new PointerEventData(eventSystem)
        {
            position = screenPosition
        };

        // 用于存储检测结果
        List<RaycastResult> results = new List<RaycastResult>();
        
        // 对屏幕坐标进行射线检测
        raycaster.Raycast(pointerEventData, results);

        // 遍历检测结果
        foreach (RaycastResult result in results)
        {
            var target = result.gameObject.GetComponent<Button>();
            if (target != null)
            {
                // 触发按钮点击事件
                //         button.onClick.Invoke();
                
                // ExecuteEvents.Execute(result.gameObject, pointerEventData, ExecuteEvents.submitHandler);
                ExecuteEvents.Execute(result.gameObject, pointerEventData, ExecuteEvents.pointerClickHandler);

                Debug.Log("Button triggered: " + result.gameObject.name);
                return true;
            }
        }

        return false;
    }
}