using UnityEngine;

/// <summary>
/// Отвечает только за отображение и обновление UI монет
/// </summary>
public class CoinUI : MonoBehaviour
{
    [SerializeField] private int playerId;
    [SerializeField] private Coin coin;
    
    private int lastCoins;
    private bool eventsSubscribed;

    private void OnEnable()
    {
        CreditSystem.OnInitialize += Subscribe;
        
        if (!eventsSubscribed && (CreditSystem.onCoinAdded != null || CreditSystem.onCoinRemoved != null))
            Subscribe();
    }

    private void OnDisable()
    {
        if (eventsSubscribed)
        {
            if (CreditSystem.onCoinAdded != null) CreditSystem.onCoinAdded.RemoveListener(HandleCoinsChanged);
            if (CreditSystem.onCoinRemoved != null) CreditSystem.onCoinRemoved.RemoveListener(HandleCoinsChanged);
            eventsSubscribed = false;
        }
        
        CreditSystem.OnInitialize -= Subscribe;
    }

    private void Subscribe()
    {
        if (eventsSubscribed) return;

        if (CreditSystem.onCoinAdded != null) CreditSystem.onCoinAdded.AddListener(HandleCoinsChanged);
        if (CreditSystem.onCoinRemoved != null) CreditSystem.onCoinRemoved.AddListener(HandleCoinsChanged);

        lastCoins = CreditSystem.GetPlayerCredits(playerId);
        eventsSubscribed = true;
    }

    private void Start()
    {
        int current = CreditSystem.GetPlayerCredits(playerId);
        lastCoins = current;

        if (coin != null)
        {
            coin.ChangeCoinText($"{current}");
            if (current == 0) coin.FreezeCoin(); 
            else coin.UnfreezeCoin();
        }
    }

    private void HandleCoinsChanged(int playerID, int newAmount)
    {
        if (coin == null || playerID != playerId) return;

        coin.ChangeCoinText($"{newAmount}");

        if (newAmount == 0) coin.FreezeCoin(); 
        else coin.UnfreezeCoin();

        if (newAmount > lastCoins) 
            coin.PlayAddCoinsAnimation();

        lastCoins = newAmount;
    }
}