using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.XR.Interaction.Toolkit;

public class LeverController : MonoBehaviour
{
    private Transform pivot; //The lever will use a pivot point
    private Transform grabHand; // ONLY ONE HAND WORKS RIGHT NOW. NEED A SOLUTION! SET HAND TRANSFORM IN onSelectedEntered()
                                // IN INTERACTION EVENTS UNTIL A BETTER SOLUTION
    private bool leverGrabbed;
    private bool eventCalled;

    private Vector3 handDelta;
    private Vector3 lastPosition;

    //These UnityEvent objects can be set in the inspector as any public methods from scripts
    [SerializeField]
    private UnityEvent onUp;
    [SerializeField]
    private UnityEvent onDown;

    public float minAngle = 20f;
    public float maxAngle = 75f;

    public float hapticAmplitude = 1f;
    public float hapticDuration = 0.1f;

    void Awake()
    {
        pivot = transform.parent;
        leverGrabbed = false;
        pivot.eulerAngles = new Vector3(pivot.eulerAngles.x, pivot.eulerAngles.y, minAngle);
    }

    void Update()
    {
        if (leverGrabbed)
        {
            handDelta = lastPosition - grabHand.position; //The vector of hand movement between frames
            pivot.RotateAround(pivot.position, pivot.forward, 200 * handDelta.y); //Is a Time.deltaTime multiplication needed here?

            //Two following if statements set the up and down position angles and call events when angle is met
            //Only one event is called per grab because the logic is in the update method
            if(pivot.eulerAngles.z < minAngle)
            {
                pivot.eulerAngles = new Vector3(pivot.rotation.x, pivot.rotation.y, minAngle);
                if (!eventCalled)
                {
                    onUp.Invoke();
                    grabHand.gameObject.GetComponent<ActionBasedController>().SendHapticImpulse(hapticAmplitude, hapticDuration);
                    eventCalled = true;
                }
            } 
            else if(pivot.eulerAngles.z > maxAngle)
            {
                pivot.eulerAngles = new Vector3(pivot.rotation.x, pivot.rotation.y, maxAngle);
                if (!eventCalled)
                {
                    onDown.Invoke();
                    grabHand.gameObject.GetComponent<ActionBasedController>().SendHapticImpulse(hapticAmplitude, hapticDuration);
                    eventCalled = true;
                }
            }

            lastPosition = grabHand.position;
        }
    }

    public void GrabLever(Transform hand)
    {
        leverGrabbed = !leverGrabbed;
        grabHand = hand;
        handDelta = Vector3.zero;
        lastPosition = grabHand.position;
        eventCalled = false;
    }

    
}