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

public enum SelectDriction
{  
    //水平切换
    Horizontal,
    //数值切换
    Vertical
}

/// <summary>
/// 引用手
/// </summary>
public enum RenfenceHand
{
   RightHand,

   LeftHand
}

public class ButtonChangeScro : MonoBehaviour
{
    public RenfenceHand hand = RenfenceHand.LeftHand;

    /// <summary>
    /// 选择方向
    /// </summary>
    public SelectDriction selectDirction;

    [Header("功能激活")]
    public bool active = true;

    /// <summary>
    /// 要切换到页面按钮
    /// </summary>
    public ButtonItem[] btns;

    /// <summary>
    /// 目前正在操作的按钮的下标
    /// </summary>
    public int curentIndex;

    public ButtonItem currentButtonItem;


    public void Start() 
    {
        InitData();
    }

    public void InitData()
    {
        curentIndex = 0;
        if (btns != null && btns.Length > 0)
        {
            currentButtonItem = btns[curentIndex];
            currentButtonItem.Select();
        }
    }

    /// <summary>
    /// 触控板按下
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    public void TouPadPressedHandle(object sender, ControllerInteractionEventArgs e)
    {
        if (active)
        {
            if (curentIndex == 0) btns[curentIndex].Select();

            btns[curentIndex].UnSelct();

            if (selectDirction == SelectDriction.Vertical)
            {
                if (e.touchpadAxis.y > 0.7f)
                {
                    curentIndex--;
                    if (curentIndex < 0)
                    {
                        curentIndex = CheckActiveBtnCount() - 1;
                    }
                }
                else if (e.touchpadAxis.y < -0.7f)
                {
                    curentIndex++;
                    if (curentIndex >= CheckActiveBtnCount())
                    {
                        curentIndex = 0;
                    }
                }
            }
            else if (selectDirction == SelectDriction.Horizontal)
            {
                if (e.touchpadAxis.x < -0.7f)
                {
                    curentIndex--;
                    if (curentIndex < 0)
                    {
                        curentIndex = CheckActiveBtnCount() - 1;
                    }
                }
                else if (e.touchpadAxis.x > 0.7f)
                {
                    curentIndex++;
                    if (curentIndex >= CheckActiveBtnCount())
                    {
                        curentIndex = 0;
                    }
                }
            }
            btns[curentIndex].Select();
        }
    }

    public void TouPadPressedHandleConfirm(object sender, ControllerInteractionEventArgs e)
    {
        if (!active) return;
        if (e.touchpadAxis.x > 0.7f)
        {
            if (currentButtonItem != null) currentButtonItem.Cancellation();
            currentButtonItem = btns[curentIndex];
            currentButtonItem.Click();   
        }
    }

    public void TriggerPressedHandle(object sender, ControllerInteractionEventArgs e)
    {
        if (!active) return;
        if (currentButtonItem != null) currentButtonItem.Cancellation();
        currentButtonItem = btns[curentIndex];
        currentButtonItem.Click(); 
    }

    private Vector2 GetTouchPadAxi(VRTK_ControllerReference contronllerReference)
    {
        return VRTK_SDK_Bridge.GetControllerAxis(SDK_BaseController.ButtonTypes.Touchpad, contronllerReference);
    }

    public void UnSelect()
    {
        foreach (var item in btns) item.UnSelct();
    }

    public void SetItemState(int _index, bool _isClick = false)
    {
 
        btns[curentIndex].UnSelct();

        curentIndex = _index;
        currentButtonItem = btns[curentIndex];
        btns[curentIndex].Select();

        if (_isClick == true)
        {
            Debug.Log(_index + "      " + btns[_index].name);
            btns[curentIndex].Click();
        }
    }

    private int CheckActiveBtnCount()
    {
        int tmpCount = 0;

        for (int i = 0; i < btns.Length; i++)
        {
            if (btns[i].gameObject.activeSelf) tmpCount++;
        }
        return tmpCount;
    }

    public void OnEnable()
    {
        RegisterHandEvent();
    }

    public void OnDisable() 
    {
        UnRegisterHandEvent();
    }

    private void RegisterHandEvent() 
    {
        if (active)
        {
            VRTK_ControllerEvents controllerEvent = GetHandEvent();

            if (controllerEvent != null)
            {
                controllerEvent.TouchpadPressed += TouPadPressedHandle;
                //VRDeviceManager.instance.left_HandleEvent.TouchpadPressed += TouPadPressedHandleConfirm;
                controllerEvent.TriggerPressed += TriggerPressedHandle;
            }             
        }
    }

    private void UnRegisterHandEvent()
    {
        if (active)
        {
            VRTK_ControllerEvents controllerEvent = GetHandEvent();
            
            if (controllerEvent != null)
            {
                controllerEvent.TouchpadPressed -= TouPadPressedHandle;
                //VRDeviceManager.instance.left_HandleEvent.TouchpadPressed += TouPadPressedHandleConfirm;
                controllerEvent.TriggerPressed -= TriggerPressedHandle;
            }
        }
    }

    private VRTK_ControllerEvents GetHandEvent() 
    {
        GameObject handObj;
        if (hand == RenfenceHand.LeftHand) handObj = VRTK_DeviceFinder.GetControllerLeftHand();
        else handObj = VRTK_DeviceFinder.GetControllerLeftHand();

        VRTK_ControllerEvents controllerEvent = null;
        if (handObj != null) controllerEvent = handObj.GetComponent<VRTK_ControllerEvents>();

        return controllerEvent;
    }

}