3DTD/Assets/Scripts/Manager/MoneyManager.cs

using System;
using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.Assertions;

public class MoneyManager : MonoBehaviour
{
    public TowerCollection towerCollection;
    [Space(10)]
    public GameObject[] ShopButtons;
    public TMP_Text[] MoneyTexts;

    /// <summary>
    /// Invoked when player selects tower from shop
    /// </summary>
    public static event Action<TowerInfo> OnShopSelected;

    private void OnEnable()
    {
        for (int i = 0; i < ShopButtons.Length; i++)
        {
            var eventScript = ShopButtons[i].GetComponentInChildren<UITooltips>();
            eventScript.ButtonIndex = i;

            eventScript.OnClick += OnShopButtonClicked;
        }
    }

    private void Start()
    {
        // Show prices
        for (int i = 0; i < towerCollection.Towers.Length; i++)
        {
            MoneyTexts[i].text = towerCollection.Towers[i].price.ToString();
        }
    }

    private void OnShopButtonClicked(int index)
    {
        Assert.AreNotEqual(index, -1, "Shop button not init-ed with index");

        OnShopSelected?.Invoke(towerCollection.Towers[index]);
    }
}