using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using VRTK;

//右手柄车辆控制器 用于选取车辆、控制车辆移动
public class CarVRInputCtrl : MonoBehaviour,IVRInput
{
    //当前选中的车辆
    CarCtrl currentCar;

    //当前射线指向的物体
    Transform CurrentPointerTarget;

    //左手控制器
    public VRTK_ControllerEvents leftControllerEvents;

    bool interactable=false;//是否启用

    float hor;
    float ver;
    float breakValue = 0;
    // Start is called before the first frame update
    void Start()
    {
  
    }

    /// <summary>
    /// 开启或关闭VR车辆控制输入
    /// </summary>
    /// <param name="interactable"></param>
    public void SetInteractable(bool interactable)
    {
        if (interactable == this.interactable) return;//未改变启用状态 不做处理
        this.interactable = interactable;
        if (interactable)//开启注册监听事件
        {
            RegisterHandleEvent();
        }
        else //注销事件 清空车辆和射线检测物体  恢复车辆选中状态 
        {
            CancleHandleEvent();
            if (currentCar)
            {
                currentCar.IsSelect = false;
                currentCar.StopVRCtrl();
                currentCar = null;
                CurrentPointerTarget = null;
            }
        }
    }

    //注册手柄监听事件
    void RegisterHandleEvent()
    {
        GetComponent<VRTK_ControllerEvents>().TouchpadAxisChanged += new ControllerInteractionEventHandler(DoTouchpadPressed);
        GetComponent<VRTK_ControllerEvents>().TouchpadTouchEnd += new ControllerInteractionEventHandler(DoTouchpadReleased);
        GetComponent<VRTK_ControllerEvents>().TriggerClicked += TriggerClicked;

        //GetComponent<VRTK_Pointer>().DestinationMarkerHover += DestinationMarkerHover;
        GetComponent<VRTK_Pointer>().PointerStateInvalid += PointerInValid;
        GetComponent<VRTK_Pointer>().PointerStateValid += PointerValid;
        //GetComponent<VRTK_ControllerEvents>().ButtonTwoPressed += OpenCar;//右手上部按钮会触发系统鼠标点击事件 与触控盘太近 易误触发
        leftControllerEvents.TriggerClicked += OpenCar;//改为由左手Trigger点击实现


    }

    //注销手柄监听事件
    void CancleHandleEvent()
    {
        GetComponent<VRTK_ControllerEvents>().TouchpadAxisChanged -= new ControllerInteractionEventHandler(DoTouchpadPressed);
        GetComponent<VRTK_ControllerEvents>().TouchpadTouchEnd -= new ControllerInteractionEventHandler(DoTouchpadReleased);
        GetComponent<VRTK_ControllerEvents>().TriggerClicked -= TriggerClicked;
        //GetComponent<VRTK_Pointer>().DestinationMarkerHover -= DestinationMarkerHover;
        GetComponent<VRTK_Pointer>().PointerStateInvalid -= PointerInValid;
        GetComponent<VRTK_Pointer>().PointerStateValid -= PointerValid;
        GetComponent<VRTK_ControllerEvents>().ButtonTwoPressed -= OpenCar;
    }

    // 改变当前选中车辆展开状态
    private void OpenCar(object sender, ControllerInteractionEventArgs e)
    {
        if (currentCar)
            currentCar.ChangeOpening(true);
    }

    //按下扳机
    private void TriggerClicked(object sender, ControllerInteractionEventArgs e)
    {
        if (!GetComponent<VRTK_Pointer>().IsPointerActive())//扣下扳机时 无射线射线物体信息
        {
            CurrentPointerTarget = null;//清空射线消失前选中的物体
        }

        if (currentCar)//存在当前选中车辆
        {
            if (currentCar.transform == CurrentPointerTarget)//再次选择已经选中的车不做任何处理
            {
                return;
            }
            else//选中了其他物体 或未选中任何物体
            {
                CancelCurrentCarSelelct();//取消当前车辆选中状态
            }
        }

        if (CurrentPointerTarget)//射线碰到了 一个物体
        {
            currentCar= CurrentPointerTarget.GetComponentInParent<CarCtrl>();
            if (currentCar)//选中了一辆车
            {
                currentCar.IsSelect = true;
                currentCar.StartVRCtrl();
            }
        }
    }

    //取消车辆选中状态
    private void CancelCurrentCarSelelct()
    {
        currentCar.IsSelect = false;
        currentCar.StopVRCtrl();
        currentCar = null;
    }

    //射线碰到物体  变红色
    private void PointerInValid(object sender, DestinationMarkerEventArgs e)
    {
        CurrentPointerTarget = null;
    }

    //射线碰撞到物体 变绿色
    private void PointerValid(object sender, DestinationMarkerEventArgs e)
    {
        CurrentPointerTarget = e.target;
    }

    //touch结束触碰
    private void DoTouchpadReleased(object sender, ControllerInteractionEventArgs e)
    {
        hor = 0;
        ver = 0;
        breakValue = 1;
        //if (currentCar != null)
        //    currentCar.CarMove(0, 0, 1);//停车
    }

    //touch触碰
    private void DoTouchpadPressed(object sender, ControllerInteractionEventArgs e)
    {
        hor = e.touchpadAxis.x;
        ver = e.touchpadAxis.y;
        breakValue = 0;
        //if (currentCar != null)
        //    currentCar.CarMove(e.touchpadAxis.x, e.touchpadAxis.y, 0);//移动
    }

    //private void OnEnable()
    //{
    //    EventCenter.Instance.EventTrigger<IVRInput>("AddVRInput", this); 
    //}

    //private void OnDisable()
    //{
    //    EventCenter.Instance.EventTrigger<IVRInput>("RemoveVRInput", this);
    //}

    void FixedUpdate()
    {
        if (currentCar)
        {
            currentCar.CarMove(hor, ver, breakValue);
        }
    }

    private void OnDestroy()
    {
        CancleHandleEvent();
    }

}