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

public class AutomaticExpressionChange : StateMachineBehaviour
{
     readonly float minExpressionTime = 1;
     readonly float maxExpressionTime = 5;
     float expressionTimer = 0;

     string[] expressionTriggers = {"Happy","Angry","Sad","Smile","Surprised","Eyebrow_Sad","EyebrowAngry"};
    // OnStateEnter is called when a transition starts and the state machine starts to evaluate this state
    //override public void OnStateEnter(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    //{
    //    
    //}

    // OnStateUpdate is called on each Update frame between OnStateEnter and OnStateExit callbacks
    override public void OnStateUpdate(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
        if(expressionTimer<=0)
        {
            RandomExpression(animator);
            expressionTimer = Random.Range(minExpressionTime, maxExpressionTime);
        }
        else
        {
            expressionTimer -= Time.deltaTime;
        }    
    }

    void RandomExpression(Animator animator)
    {
        System.Random rnd = new System.Random();
        int expressionIndex = rnd.Next(expressionTriggers.Length);
        string expressionTrigger = expressionTriggers[expressionIndex];
        animator.SetTrigger(expressionTrigger); 
    }

    // OnStateExit is called when a transition ends and the state machine finishes evaluating this state
    //override public void OnStateExit(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    //{
    //    
    //}

    // OnStateMove is called right after Animator.OnAnimatorMove()
    //override public void OnStateMove(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    //{
    //    // Implement code that processes and affects root motion
    //}

    // OnStateIK is called right after Animator.OnAnimatorIK()
    //override public void OnStateIK(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    //{
    //    // Implement code that sets up animation IK (inverse kinematics)
    //}
}