using UnityEngine;
using System.Collections;

public class TriggerDetectPlayer : MonoBehaviour {


    float rotationSpeed = 270;
    float movementSpeed = 1;
    float meshRadius = 1.8f;
    bool bitting;

    IEnumerator turnTowardsPlayer;
    IEnumerator moveTowardsPlayer;

    public delegate void ZombieWalkDelegate();
    public ZombieWalkDelegate zWalk;

    public delegate void ZombieIdleDelegate();
    public ZombieWalkDelegate zIdle;

    public delegate void ZombieBiteDelegate();
    public ZombieWalkDelegate zBite;

    public delegate void ZombieStopBiteDelegate();
    public ZombieWalkDelegate zStopBite;


    void OnTriggerEnter(Collider other)
    {
        if (other.tag.Equals ("Player")) {
            //float playerDistance = Vector3.Distance(other.transform.position, this.transform.position);
            //Debug.Log ("Encontrou o Player");

            //if(playerDistance >= 2f * meshRadius)
            //{
                turnTowardsPlayer = TurnTowardsPlayer(other.transform);
                moveTowardsPlayer = MoveTowardsPlayer(other.transform);
                StartCoroutine(turnTowardsPlayer);
                StartCoroutine(moveTowardsPlayer);
            //}
        }
    }


    void OnTriggerExit(Collider other)
    {
        if (other.tag.Equals ("Player")) {
            float playerDistance = Vector3.Distance(other.transform.position, this.transform.position);

            if(playerDistance >= 2f * meshRadius)
            {
                StopCoroutine(turnTowardsPlayer);
                StopCoroutine(moveTowardsPlayer);
                zIdle();
            }
        }
    }

    IEnumerator TurnTowardsPlayer(Transform player)
    {
        while (true) {
            Quaternion targetRotation = Quaternion.LookRotation(player.position - transform.position, Vector3.up);
            targetRotation.x = 0;
            targetRotation.z = 0;

            transform.rotation = Quaternion.RotateTowards(transform.rotation, targetRotation, 1);
            yield return 0;
        }
    }

    IEnumerator MoveTowardsPlayer(Transform player)
    {
        while (true) {
            Vector3 playerDirection = transform.position - player.position;
            playerDirection.y = 0;
            playerDirection = playerDirection.normalized;

            Vector3 deltaMovement = playerDirection * movementSpeed * Time.deltaTime;

            transform.position -= deltaMovement;

            float playerDistance = Vector3.Distance(player.position, this.transform.position);
            //Debug.Log ("Player Distance: " + playerDistance + "Mesh radius: " + meshRadius);

            if(playerDistance <= meshRadius && !bitting)
            {
                zBite();
                bitting = true;
            }

            if(playerDistance >= meshRadius && bitting)
            {
                Debug.Log ("Saiu de perto player");
                zStopBite();
                bitting = false;
            }



            zWalk();
            yield return 0;
        }
    }
}

using UnityEngine;
using System.Collections;

public class ChangeAnimation : MonoBehaviour {

    Animator anim;
    public TriggerDetectPlayer tdp;

    void Start()
    {
        anim = GetComponent<Animator> ();
        tdp.zWalk = ZombieWalk;
        tdp.zIdle = ZombieIdle;
        tdp.zBite = ZombieNeckBite;
        tdp.zStopBite = ZombieStopBiting;

    }

    void ZombieWalk()
    {
        anim.SetBool ("playerDetected", true);
    }

    void ZombieIdle()
    {
        anim.SetBool ("playerDetected", false);
    }

    void ZombieNeckBite()
    {
        anim.SetBool ("bite", true);
    }

    void ZombieStopBiting()
    {
        anim.SetBool ("bite", false);
    }
}