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

public class GameManager : MonoBehaviour {

    int selectedZombiePosition = 0;
    public GameObject selectedZombie;
    public List<GameObject> zombies;
    public Vector3 selectedSize;
    public Vector3 defaultSize;
    public Text text;
    int score = 0;

    // Use this for initialization
    void Start () {
        SelectZombie(zombies [0], 0);
        text.text = "Score: " + score;
    }

    // Update is called once per frame
    void Update () {

        if (Input.GetKeyDown ("left"))
            GetZombieLeft ();

        if (Input.GetKeyDown ("right"))
            GetZombieRight ();

        if (Input.GetKeyDown ("up"))
            PushUp ();

    }

    void GetZombieLeft() {
        if (selectedZombiePosition == 0) {
            SelectZombie (zombies [3], 3);
        } else {
            SelectZombie (zombies [selectedZombiePosition - 1], selectedZombiePosition - 1);
        }
    }

    void GetZombieRight() {
        if (selectedZombiePosition == 3) {
            SelectZombie (zombies [0], 0);
        } else {
            SelectZombie(zombies[selectedZombiePosition + 1], selectedZombiePosition + 1);
        }
    }

    void SelectZombie(GameObject newZombie, int newPosition) {
        selectedZombie.transform.localScale = defaultSize;

        selectedZombie = newZombie;

        selectedZombie.transform.localScale = selectedSize;

        selectedZombiePosition = newPosition;
    }

    void PushUp() {
        Rigidbody rb = selectedZombie.GetComponent<Rigidbody> ();
        rb.AddForce (0, 0, 10, ForceMode.Impulse);
    }

    public void AddScore() {
        score = score + 1;
        text.text = "Score: " + score;
    }
}