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

public class TF_FSC : MonoBehaviour {

	public GameObject enemyPrefab;
	[SerializeField]
	private float spawnDelay = .5f;

	[SerializeField]
	private float width = 2f;
	[SerializeField]
	private float height = 2f;
	[SerializeField]
	private float speed = 5f;

	private bool movingRight = true;
	private float xmax;
	private float xmin;

	public float Delay;
	public float EnemyCount;

	public AudioClip TFEngine;

	// Use this for initialization
	void Start () {
		// Assigning PlaySpace Move boundaries
		float distanceToCamera = transform.position.z - Camera.main.transform.position.z;
		Vector3 leftBoundary = Camera.main.ViewportToWorldPoint(new Vector3(0,0,distanceToCamera));
		Vector3 rightBoundary = Camera.main.ViewportToWorldPoint(new Vector3(1,0,distanceToCamera));
		xmax = rightBoundary.x;
		xmin = leftBoundary.x;
	}

	public void OnDrawGizmos() {
		Gizmos.DrawWireCube(transform.position, new Vector3(width, height));
	}
	
	// Update is called once per frame
	void Update () {
		if(this.transform.parent.GetComponent<TF_Squadron>().SquadronDelay <= 0){
			Delay -= Time.deltaTime;
			if(AllMembersDead()){
				SpawnUntilFull();
			}
		}
	}

	bool AllMembersDead (){
		foreach(Transform childPositionGameObject in transform){
			if (childPositionGameObject.childCount > 0){
					return false;
			}
		}
		return true;
	}

	Transform NextFreePosition () {
		foreach(Transform childPositionGameObject in transform) {
			if (childPositionGameObject.childCount == 0) {
				return childPositionGameObject;
			}
		}
		return null;
	}

	void SpawnUntilFull () {
		Transform freePosition = NextFreePosition();
		if (EnemyCount > 0){
			if (Delay <= 0){
				if (freePosition) {
					GameObject enemy = Instantiate(enemyPrefab, freePosition.position, Quaternion.identity) as GameObject;
					enemy.transform.parent = freePosition;
					EnemyCount -= 1;
					AudioSource.PlayClipAtPoint(TFEngine, transform.position);
				}
			}
		}
		if(NextFreePosition()) {
			Invoke ("SpawnUntilFull", spawnDelay);
		}
	}
}