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

public class TapGesture : MonoBehaviour
{
    private bool isClick = false;
    private float lastClick = 0;
    public int clickCount = 0;
    public float timeCount = 0.1f;
    public EventSystem eventsystem;
    public GraphicRaycaster RaycastInCanvas;
    public UnityEvent onOneClick;
    public UnityEvent onDoubleClick;

    [SerializeField]
    private Camera _camera;
    public bool debug;
    private RaycastHit _result = new RaycastHit();
    private Ray _ray;
    public LayerMask _layerMask = Physics.DefaultRaycastLayers;

    private void Update()
    {
        if (CheckGuiRaycastObjects())
        {
            return;
        }
        //_ray = Raycast(Input.mousePosition, out _result);

        if (Input.GetMouseButtonDown(0))
        {
            timeCount = 0.1f;
            if (Time.realtimeSinceStartup - lastClick < 0.2f)
            {
                clickCount = 2;
            }
            else
            {
                clickCount = 1;
            }
        }


        if (Input.GetMouseButtonUp(0))
        {
            isClick = false;
            lastClick = Time.realtimeSinceStartup;

        }

        if (!isClick)
        {
            timeCount -= Time.deltaTime;
            if (timeCount <= 0)
            {
                if (clickCount == 2)
                {
                    onDoubleClick?.Invoke();
                    Debug.Log("2");
                }
                else if (clickCount == 1)
                {
                    onOneClick?.Invoke();
                    Debug.Log("1");
                }
                isClick = true;
                clickCount = 0;

            }
        }
    }
    public void SetLayerMask(int layerMask = Physics.DefaultRaycastLayers)
    {
        _layerMask = layerMask;
    }
    public Ray GetRay()
    {
        return _ray;
    }
    public RaycastHit HitTest()
    {
        return _result;
    }
    public RaycastHit HitTest(Vector3 position, bool worldPosition)
    {
        RaycastHit result = new RaycastHit();
        if (worldPosition == true) position = _camera.WorldToScreenPoint(position);
        Raycast(position, out result);
        return result;
    }

    public Ray Raycast(Vector3 pos, out RaycastHit hitInfo)
    {

        if (_camera == null) _camera = Camera.main;
        Ray ray = _camera.ScreenPointToRay(pos);
        // regular 3D raycast
        bool hit = Physics.Raycast(ray, out hitInfo, Mathf.Infinity, _layerMask);
        //#if UNITY_EDITOR
        // vizualise ray
        //lineRenderer.SetPosition(0, ray.origin+new Vector3(0.0f,-0.3f));
        if (debug)
        {
            if (hit)
            {
                Vector3 hitPos = hitInfo.point;

                Debug.DrawLine(ray.origin, hitPos, Color.green, 0.5f);
                //lineRenderer.SetPosition(1, hitPos);
            }
            else
            {
                //Debug.Log("Raycase " +debug+" -> "+ ray);
                Debug.DrawLine(ray.origin, ray.origin + ray.direction * 9999.0f, Color.red, 0.5f);
                //lineRenderer.SetPosition(1, ray.origin + ray.direction * 50);
            }
        }
        //#endif
        return ray;
    }

    /// <summary>
    /// UI 防穿透
    /// </summary>
    /// <returns></returns>
    public bool CheckGuiRaycastObjects()
    {
        PointerEventData eventData = new PointerEventData(eventsystem);
        eventData.pressPosition = Input.mousePosition;
        eventData.position = Input.mousePosition;
        List<RaycastResult> list = new List<RaycastResult>();
        RaycastInCanvas.Raycast(eventData, list);
        return list.Count > 0;
    }
}