using UnityEngine;
using UnityEngine.EventSystems;
using ZXKFramework;

public class MouseDragObj : MonoBehaviour
{
    private Vector3 screenPoint;
    private Vector3 offset;
    private Camera mCamera;
    [HideInInspector]
    public bool isDrag;
    public float distance = 1f;
    public bool lookat;
    private void OnMouseDown()
    {
        if (EventSystem.current && EventSystem.current.IsPointerOverGameObject()) return;
        isDrag = true;
        if (!mCamera)
        {
            mCamera = Camera.main;
        }
        screenPoint = mCamera.WorldToScreenPoint(transform.position);
        offset = transform.position - mCamera.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
    }
    //位置复原
    private void OnMouseUp()
    {
        isDrag = false;
        if(TryGetComponent(out ResetPosRot reset))
        {
            reset.ResetGameObject();
        }
    }
    private void OnMouseDrag()
    {
        if (isDrag && Input.GetMouseButton(0))
        {
            Ray ray = mCamera.ScreenPointToRay(Input.mousePosition); // 将鼠标位置转换为射线
            transform.position = ray.GetPoint(distance) + offset;
            if(lookat) { transform.LookAt(mCamera.transform); }
            if (TryGetComponent(out PC_DragEvent dragEvent))
            {
                dragEvent.stay?.Invoke(gameObject);
            }
            RaycastHit[] hits = Physics.RaycastAll(ray); // 进行射线检测并返回所有命中结果数组
            foreach (var hit in hits) // 遍历每个命中结果
            {
                if (hit.transform.TryGetComponent(out PC_TriggerEvent triggerEvent))
                {
                    if (triggerEvent.trigger != null)
                    {
                        triggerEvent.trigger.Invoke(gameObject);
                    }
                    else
                    {
                        if (TryGetComponent(out PC_TriggerEvent triggerEvent_))
                        {
                            triggerEvent_.trigger?.Invoke(hit.transform.gameObject);
                        }
                    }
                }
            }
        }
    }
    private void OnDisable()
    {
        isDrag = false;
        if (TryGetComponent(out ResetPosRot reset))
        {
            reset.ResetGameObject();
        }
    }
}