using UnityEngine;

public class SpawnManager : MonoBehaviour {

    public GameObject[] animalPrefabs;
    private Vector3 spawnPos = Vector3.zero;

    private float rangeX = 15;
    private float rangeZTop = 15;
    private float rangeZBottom = 2;
    private float zWhenXSpawning = 19f;
    private float xWhenZSpawning = 22f;

    private float startDelay = 2f;
    private float repeatDelay = 0.5f;

    private void Start() {
        InvokeRepeating("SpawnRandomAnimal", startDelay, repeatDelay);
    }

    private void SpawnRandomAnimal() {
        int animalIndex = Random.Range(0, animalPrefabs.Length);

        int direction = Random.Range(1, 4);
        switch(direction) {
            case 1: //Top
                Instantiate(animalPrefabs[animalIndex],
                    new Vector3(Random.Range(-rangeX, rangeX), 0f, zWhenXSpawning),
                    Quaternion.Euler(0, 180, 0));
                break;

            case 2: //Left
                Instantiate(animalPrefabs[animalIndex],
                    new Vector3(-xWhenZSpawning, 0f, Random.Range(rangeZBottom, rangeZTop)),
                    Quaternion.Euler(0, 90, 0));
                break;

            case 3: //Right
                Instantiate(animalPrefabs[animalIndex],
                    new Vector3(xWhenZSpawning, 0f, Random.Range(rangeZBottom, rangeZTop)),
                    Quaternion.Euler(0, -90, 0));
                break;
        }
    }
}