using UnityEngine;
using System.Collections;
public class SceneController : MonoBehaviour {
    public const int gridRows = 2;
    public const int gridCols = 4;
    public const float offsetX = 2f;
    public const float offsetY = 2.5f;
    private MemoryCard _firstRevealed;
    private MemoryCard _secondRevealed;
    private int _score = 0;
    [SerializeField] private MemoryCard originalCard;
    [SerializeField] private Sprite[] images;
    [SerializeField] private TextMesh scoreLabel;
    void Start() { 
            Vector3 startPos = originalCard.transform.position;
        int[] numbers = {0, 0, 1, 1, 2, 2, 3, 3}; 
            numbers = ShuffleArray(numbers);
        for (int i = 0; i < gridCols; i++) {
            for (int j = 0; j < gridRows; j++) {
                MemoryCard card;
                if (i == 0 && j == 0) {
                    card = originalCard;
                } else {
                    card = Instantiate(originalCard) as MemoryCard;
                }
                int index = j * gridCols + i;
                int id = numbers[index]; 
                    card.SetCard(id, images[id]);
                float posX = (offsetX * i) + startPos.x;
                float posY = -(offsetY * j) + startPos.y;
                card.transform.position = new Vector3(posX, posY, startPos.z);
            }
        }
    }
    private int[] ShuffleArray(int[] numbers) { 
        int[] newArray = numbers.Clone() as int[];
        for (int i = 0; i < newArray.Length; i++ ) {
            int tmp = newArray[i];
            int r = Random.Range(i, newArray.Length);
            newArray[i] = newArray[r];
            newArray[r] = tmp;
        }
        return newArray;
    }

    public bool canReveal
    {
        get { return _secondRevealed == null; }
    }

    public void CardRevealed(MemoryCard card) {
        if (_firstRevealed == null) {
            _firstRevealed = card;
        } else {
            _secondRevealed = card;
            StartCoroutine(CheckMatch());  
        }
    }
    
    private IEnumerator CheckMatch()
    {
        if (_firstRevealed.id == _secondRevealed.id)
        {
            _score++;
            scoreLabel.text = "Score: " + _score;
        }
        else {
            yield return new WaitForSeconds(.5f);
            _firstRevealed.Unreveal();
                _secondRevealed.Unreveal();
        }
        _firstRevealed = null; 
            _secondRevealed = null;
    }
    public void Restart() {
        Application.LoadLevel("SampleScene");
    }
}