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

public class BattlePlayerControls : MonoBehaviour
{
    public GameObject uiCanvas;
    public GameObject cardPrefab;

    public delegate void CardUsedAction(int i);
    public event CardUsedAction OnCardUsed;

    private List<GameObject> cardsInHand;

    // Start is called before the first frame update
    void Start()
    {
        
    }

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

    public void SetHand(int numberOfCards) {
        this.cardsInHand = new List<GameObject>();
        for (int i = 0; i < numberOfCards; i++) {
            GameObject newCard = Instantiate(this.cardPrefab, this.uiCanvas.transform);
            this.cardsInHand.Add(newCard);
            newCard.transform.position = CalculateCardPosition(i, numberOfCards);
            Button button = newCard.GetComponent<Button>();
            int cardIndex = i;
            button.onClick.AddListener(delegate {OnCardClicked(cardIndex);});
        }
    }

    private Vector3 CalculateCardPosition(int index, int count) {
        const int CARD_SIZE = 120;
        const int SPACING = 8;
        const int DELTA = CARD_SIZE + SPACING;
        
        return new Vector3(Screen.width * 0.5f - DELTA / 2 * (count - 1) + DELTA * index, 160, 0);
    }

    private void OnCardClicked(int index) {
        OnCardUsed(index);
    }
}