using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class UIMouseOver : MonoBehaviour, IPointerClickHandler, IPointerEnterHandler, IPointerExitHandler
{
    Coroutine _trackCor;
    private RectTransform _canvasRectTransform;//����

    //地图的宽高
    public int worldWidth;
    public int worldHeight;

    //
    private float _initX;
    private float _initY;

    private Vector3 _overPos;

    public void OnPointerClick(PointerEventData eventData)
    {
        throw new System.NotImplementedException();
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        if(MapManager.Instance._curOpenMapId < 0)
        {
            UIWindow.Instance.ShowMessage("先打开地图");
            return;
        }

        worldWidth = MapManager.Instance.mapWidth;
        worldHeight = MapManager.Instance.mapHeight;

        _canvasRectTransform = UIWindow.Instance.newMapTrans.parent.GetComponent<RectTransform>();

        _trackCor = StartCoroutine(TrackPointer());
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        if (_trackCor == null)
            return;

        StopCoroutine(_trackCor);

        _trackCor = null;
    }

    IEnumerator TrackPointer()
    {
        while (Application.isPlaying)
        {
            CurMousePosition();
            yield return 0;
        }
    }

    public void CurMousePosition()
    {
        Vector2 pos;
        Vector2 screenPos = RectTransformUtility.WorldToScreenPoint(Camera.main, Input.mousePosition);
        if (RectTransformUtility.ScreenPointToLocalPointInRectangle(_canvasRectTransform, Input.mousePosition, Camera.main, out pos))
        {
            float offsetX = UIWindow.Instance.newMapTrans.GetComponent<RectTransform>().anchoredPosition.x - _initX;
            float offsetY = UIWindow.Instance.newMapTrans.GetComponent<RectTransform>().anchoredPosition.y - _initY;

            float x = pos.x - offsetX;
            float y = pos.y - offsetY;

            Debug.Log($"坐标：{x + worldWidth / 10 / 2}, {y + worldHeight / 10 / 2}");
            _overPos = new Vector3(x + worldWidth / 10 / 2, 0, y + worldHeight / 10 / 2);
        }
    }

    // Start is called before the first frame update
    void Start()
    {
        _initX = UIWindow.Instance.newMapTrans.transform.GetComponent<RectTransform>().anchoredPosition.x;
        _initY = UIWindow.Instance.newMapTrans.transform.GetComponent<RectTransform>().anchoredPosition.y;
    }
}