public GameObject topSpawn, leftSpawn, rightSpawn, bottomSpawn;
public GameObject spawnLocation;
public float lastSpawn;
public float timeBetweenSpawns = 1f;
public float timeSinceLastSpawnShuffle;


	void Awake()
	{
		GetSpawnLocation();
	}

	void Update()
	{
		lastSpawn = lastSpawn + Time.deltaTime;
		timeSinceLastSpawnShuffle = timeSinceLastSpawnShuffle + Time.deltaTime;
		if (timeSinceLastSpawnShuffle > 10f)
		{
			GetSpawnLocation();
		}
	}

	public void GetSpawnLocation()
	{
		float spawnLocationChance = Random.value;

		if (spawnLocationChance >= 0 && spawnLocationChance < 0.25)
		{
			spawnLocation = topSpawn;
		}
		if (spawnLocationChance >= 0.25 && spawnLocationChance < 0.50)
		{
			spawnLocation = rightSpawn;
		}
		if (spawnLocationChance >= 0.50 && spawnLocationChance < 0.75)
		{
			spawnLocation = bottomSpawn;
		}
		if (spawnLocationChance >= 0.75 && spawnLocationChance < 1.00)
		{
			spawnLocation = leftSpawn;
		}
	}

	void SpawnEnemies()
	{
		if (lastSpawn > timeBetweenSpawns && enemiesSpawned < enemiesToSpawn)
		{
			if (spawnLocation == topSpawn || spawnLocation == bottomSpawn)
			{
				GameObject enemy = Instantiate (enemy, (spawnLocation.transform.position + new Vector3 (Random.Range(-20, 20), 0, 0)), Quaternion.identity) as GameObject;
				lastSpawn = 0;
			}

			if (spawnLocation == leftSpawn || spawnLocation == rightSpawn)
			{
				GameObject enemy = Instantiate (enemy, (spawnLocation.transform.position + new Vector3 (0, 0, Random.Range(-20, 20))), Quaternion.identity) as GameObject;
				lastSpawn = 0;
			}
		}
	}