MeleeEnemyAI

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

public class StandInScript : MonoBehaviour
{

    /// <summary>
    /// THERE ARE TWO PARTS FOR THIS SCRIPT. You need to have another gameobject with the script "PlayerCheck" that has a collider to your choice of size. MAKE SURE THE COLLIDER IS A TRIGGER AND 2D. MAKE SURE THE PLAYER IS TAGGED AS PLAYER AS WELL!!!
    /// This script roams randomly every x seconds you set inside of the inspector and then when you get in range
    /// of the enemy, it'll chase the player.
    /// </summary>

    public enum Phase
    {
        FREEROAM,
        ATTACK
    }

    public Phase currentPhase;
    public Rigidbody2D rb;
    private GameObject player;
    [HideInInspector] public bool playerInRange;

    //Free Roam Variables
    public float freeRoamSpeed;
    public float timeBetweenMove;
    public float timeToMove;
    private float timeBetweenMoveCounter;
    private float timeToMoveCounter;
    private bool canFreeRoam;
    private Vector3 moveDirection;

    //Atac Variables
    public GameObject target;
    public float combatMoveSpeed;

    // Start is called before the first frame update
    void Start()
    {
        if(!GameObject.Find("Player"))
        {
            Debug.LogWarning("No Game Objects Named 'Player' In The Scene!");
        }

        if(GameObject.Find("Player"))
            player = GameObject.Find("Player");

        if(gameObject.GetComponent<Rigidbody2D>() == null)
        {
            Debug.LogWarning("Game Object Doesn't Have a Rigidbody2D!");
        }

        if(gameObject.GetComponent<Rigidbody2D>() != null)
        {
            rb = gameObject.GetComponent<Rigidbody2D>();
        }
    }

    // Update is called once per frame
    void Update()
    {
        switch(currentPhase)
        {
            case Phase.ATTACK:
                HandleAttack();
                break;

            case Phase.FREEROAM:
                HandleFreeroam();
                break;
        }
    }

    void HandleAttack()
    {
        if (target != null)
        {
            transform.rotation = Quaternion.LookRotation(Vector3.forward, target.transform.position - transform.position);
            transform.position = Vector2.MoveTowards(transform.position, target.transform.position, combatMoveSpeed);
        }
    }

    void HandleFreeroam()
    {
        //If the enemy can free roam...
        if (canFreeRoam)
        {
            //Start the counter...
            timeToMoveCounter -= Time.deltaTime;

            //Apply movement to the rigidbody [X]
            rb.velocity = moveDirection;

            //If the time to move has been spent then...
            if (timeToMoveCounter <= 0f)
            {
                //Enemy can't free roam anymore
                canFreeRoam = false;

                timeToMoveCounter = Random.Range(timeToMove * 0.75f, timeToMove * 1.25f);
            }
        }

        if (!canFreeRoam)
        {
            rb.velocity = Vector3.zero;
            timeBetweenMoveCounter -= Time.deltaTime;
            if (timeBetweenMoveCounter <= 0f)
            {
                //Enemy can roam
                canFreeRoam = true;
                //Reset the time between move counter
                timeBetweenMoveCounter = Random.Range(timeBetweenMove * 0.75f, timeBetweenMove * 1.25f);

                //Apply movement to move direction [X]
                moveDirection = new Vector3(Random.Range(-1f, 1f) * freeRoamSpeed, Random.Range(-1f, 1f) * freeRoamSpeed, 0);
            }
        }
    }
}