xd

using UnityEngine;
using System.Collections;

public class EnemyMovement : MonoBehaviour
{
    [Range(0, 360)]
    public float enemyFOV = 120f;
    [Range(5, 30)]
    public float detectionRange = 15f;

    private float deadZone = 5f;
    private NavMeshAgent nav;
    private GameObject player;
    private Animator anim;
    private HashIDs hash;
    private SphereCollider sCollider;
    private EnemyAnimatorHelper animatorHelper;
    private Health health;

    private bool playerInFOV;
    private bool playerInHearRange;

    private CapsuleCollider cCollider;

    private Vector3 lastKnownPosition;
    private float speed;
    private float angle;
    private bool enemyAnimIsDead;

    private float timer = 0.0f;
    private AudioSource footStepSound;

    void Awake()
    {
        nav = GetComponent<NavMeshAgent>();
        anim = GetComponent<Animator>();
        sCollider = GetComponent<SphereCollider>();
        health = GetComponent<Health>();
        cCollider = GetComponent<CapsuleCollider>();
        player = GameObject.FindGameObjectWithTag(Tags.player);
        hash = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent<HashIDs>();
        animatorHelper = new EnemyAnimatorHelper(anim, hash);

        nav.updateRotation = false;

        deadZone *= Mathf.Deg2Rad;

        anim.SetLayerWeight(1, 1f);

        lastKnownPosition = transform.position;

        playerInFOV = false;
        playerInHearRange = false;
        speed = 0f;
        angle = 0f;

        sCollider.radius = detectionRange;

        footStepSound = GetComponent<AudioSource>();

        enemyAnimIsDead = true;
    }

    void OnAnimatorMove()
    {

        nav.velocity = anim.deltaPosition / Time.deltaTime;
        transform.rotation = anim.rootRotation;

    }

    void Update()
    {

        if (health.currentHealth > 0)
        {

        DetectionManager();
        DecisionManager();
        Debug.DrawLine(lastKnownPosition, lastKnownPosition + Vector3.up * 4, Color.blue);

        if (playerInFOV)
            Debug.DrawLine(lastKnownPosition, lastKnownPosition + new Vector3(1, 2, 0), Color.red);
        if (playerInHearRange)
            Debug.DrawLine(lastKnownPosition, lastKnownPosition + new Vector3(-11, 2, 0), Color.green);
        }
        else
        {
            DeathAnimation();

            timer += Time.deltaTime;
            {
                if (timer > 5.0f)

                 Destroy(this.gameObject);
            }
        }

    }

    void OnTriggerStay(Collider other)
    {
        if (other.gameObject == player)
        {

            lastKnownPosition = player.transform.position;
            playerInHearRange = true;
            Debug.DrawLine(transform.position + Vector3.up, lastKnownPosition + Vector3.up, Color.green);

        }

    }

    void OnTriggerExit(Collider other)
    {
        if (other.gameObject == player)
        {

            lastKnownPosition = player.transform.position;
            playerInFOV = false;
            playerInHearRange = false;
        }
    }
    void DetectionManager()
    {
        DetectionManager(lastKnownPosition);
    }

    void DetectionManager(Vector3 position)
    {
        if (Vector3.Distance(transform.position, position) < sCollider.radius)
        {
            Vector3 direction = position - transform.position;
            float signAngle = Vector3.Angle(direction, transform.forward);

            if (signAngle < enemyFOV * 0.5f)
            {
                RaycastHit hit;

                if (Physics.Raycast(transform.position + transform.up, direction.normalized, out hit, sCollider.radius))
                {
                    if (hit.collider.gameObject == player)
                    {


                        Debug.DrawLine(transform.position + Vector3.up, position + Vector3.up, Color.red);
                        playerInFOV = true;
                    }
                    else
                    {
                        playerInFOV = false;
                    }
                }


            }

        }



    }


    void DecisionManager()
    {
        angle = FindAngle(transform.forward, lastKnownPosition - transform.position, transform.up);

        if(Vector3.Distance(lastKnownPosition, transform.position) < 1.5f)
        {
            if (playerInHearRange)
            {
                MovementManager(0, angle);
            }
            MovementManager(0, 0);
            return;
        }
        else
        {

            if(playerInHearRange)
            {
                //turn in sound direction
                speed = 1f;

            }

            if (playerInFOV)
            {
                //attack
                speed = 4f;
            }

            MovementManager(speed, angle);
            return;
        }

    }


    void MovementManager(float speed = 0, float angle = 0)
    {
        if(Mathf.Abs(angle)< deadZone)
        {
            transform.LookAt(transform.position + nav.desiredVelocity);
            angle = 0;

        }



        animatorHelper.Setup(speed, angle);
    }

    private void DeathAnimation()
    {
        if (enemyAnimIsDead)

        {
            anim.SetTrigger(hash.isDead);
            cCollider.isTrigger = true;
            enemyAnimIsDead = false;
        }
    }

    float FindAngle(Vector3 fromVector, Vector3 toVector, Vector3 upVector)
    {
        if (toVector == Vector3.zero)
            return 0f;

        float angle = Vector3.Angle(fromVector, toVector);
        Vector3 normal = Vector3.Cross(fromVector, toVector);
        angle *= Mathf.Sign(Vector3.Dot(normal, upVector));

        angle *= Mathf.Deg2Rad;

        return angle;
    }

    void FootSteps()
    {

        footStepSound.pitch = UnityEngine.Random.Range(0.9f, 1.1f);
        footStepSound.PlayOneShot(footStepSound.clip);
    }
}