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

public class HeroHandControls
{
    public delegate void CardClickedAction(HeroCard card);
    public event CardClickedAction OnCardClicked;

    private MonoBehaviour root;
    private GameObject uiCanvas;
    private GameObject cardPrefab;

    private List<GameObject> cardsInHandUIs;

    public HeroHandControls(MonoBehaviour root, GameObject uiCanvas, GameObject cardPrefab) {
        this.root = root;
        this.uiCanvas = uiCanvas;
        this.cardPrefab = cardPrefab;
    }
    
    public void SetHeroHand(List<HeroCard> hand) {
        if (this.cardsInHandUIs != null) {
            foreach (GameObject cardInHandUI in this.cardsInHandUIs) {
                GameObject.Destroy(cardInHandUI);
            }
        }

        this.cardsInHandUIs = new List<GameObject>();
        for (int i = 0; i < hand.Count; i++) {
            HeroCard card = hand[i];
            GameObject cardUI = GameObject.Instantiate(this.cardPrefab, this.uiCanvas.transform);
            this.cardsInHandUIs.Add(cardUI);
            cardUI.transform.position = CalculateHandCardPosition(i, hand.Count);
            cardUI.GetComponent<CardUI>().Init(card);
            int cardIndex = i;
            cardUI.GetComponent<Button>().onClick.AddListener(delegate {OnCardClicked(card);});
        }
    }
    
    private Vector3 CalculateHandCardPosition(int index, int count) {
        const int SPACING = 8;
        const int DELTA = BattleCardPrefabConstants.CARD_WIDTH + SPACING;
        
        return new Vector3(Screen.width * 0.5f - DELTA / 2 * (count - 1) + DELTA * index,
                SPACING + BattleCardPrefabConstants.CARD_HEIGHT / 2,
                0);
    }
}