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

public class NewEnemySpawning : MonoBehaviour
{
    [SerializeField]private GameObject _enemyUnit;

    private List<GameObject> _spawnedEnemies;

    //private GameObject[] _spawnedEnemies;

    [SerializeField]private GameObject _timer;

    public float _waveCoolDown;
    public float _spawnCoolDown;
    public int _currentWaveEnemyCount;

    [SerializeField]private int _maxEnemiesPerWave = 6;

    void Start()
    {
        //_spawnedEnemies = new GameObject[_maxEnemiesPerWave];
        StartCoroutine(SpawnWave());

        //getting waveCoolDown amount
        _waveCoolDown = _timer.GetComponent<NewWaveTimer>()._waveTimeLeft;
    }

    IEnumerator SpawnWave()
    {
        //let it loop
        while (true)
        {
            //spawning enemies with time in between
            for (int i = 0; i <= _maxEnemiesPerWave; i++)
            {
                //_spawnedEnemies[_maxEnemiesPerWave] = (GameObject)Instantiate(_enemyUnit, transform.position, Quaternion.identity);
                GameObject _spawnedEnemy = (GameObject)Instantiate(_enemyUnit, transform.position, Quaternion.identity);
                _spawnedEnemies.Add(_spawnedEnemy);
                _currentWaveEnemyCount++;


                //portal shake?
                yield return new WaitForSeconds(_spawnCoolDown);
            }

            //if there are no enemies then a new wave begins immediately
            if (_currentWaveEnemyCount > 0)
            {
                _waveCoolDown = 0;
            }
            _maxEnemiesPerWave++;

            yield return new WaitForSeconds(_waveCoolDown);
        }
    }

    //when enemies get destroyed the count goes down -- destruction of enemies is done in another class
    public int CurrentWaveEnemyCount
    {
        get { return _currentWaveEnemyCount; }

        set { _currentWaveEnemyCount = value; }
    }
}