using UnityEngine;
using System.Collections;

public class TriggerDetectPlayer : MonoBehaviour {


    float rotationSpeed = 180;
    float movementSpeed = 1;
    float meshRadius = 1;

    IEnumerator turnTowardsPlayer;
    IEnumerator moveTowardsPlayer;


    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);
            }
        }
    }

    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;

            yield return 0;
        }
    }
}