creative-jam-20/Assets/Scripts/GameManager.cs

using UnityEngine;
using UnityEngine.InputSystem;

public class GameManager : MonoBehaviour
{
    [SerializeField] private PlayerInput controls;
    [SerializeField] private CannonScript[] cannonList;
    [SerializeField] private UIController uiController;
    
    [Header("Game Variables")]
    [SerializeField, ReadOnly] private GameState state;
    [SerializeField, ReadOnly] private float points;

    public static GameManager Instance { get; private set; }

    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(gameObject);
        }
        else
        {
            Instance = this;
            state = GameState.InGame;
            points = 0f;
            uiController.UpdatePointsText(points);
        }
    }

    public void TriggerGameOver(int dimensionID)
    {
        if (state == GameState.Loss) return;
        
        // Stop controls
        controls.SwitchCurrentActionMap("UI");
        
        // Show Game Over Message
        Debug.Log("Game Over: Dimension " + dimensionID + " has been destroyed");
        
        // Show Options (Return to Menu / Retry)
        state = GameState.Loss;
    }
    
    public bool OnUpgrade(Upgrade selectedUpgrade)
    {
        if (!(points >= selectedUpgrade.GetCost())) return false;
        points -= selectedUpgrade.GetCost();
        uiController.UpdatePointsText(points);
        return true;
    }

    public void UpgradeFireRate(FireRateUpgrade upgrade)
    {
        foreach (var cannon in cannonList)
        {
            cannon.SetFireRate(upgrade.GetFireRate());
        }
    }

    public void UpgradeDamage(DamageUpgrade upgrade)
    {
        foreach (var cannon in cannonList)
        {
            cannon.SetDamage(upgrade.GetDamage());
        }

    }

    public void UpgradeBullets(BulletsAmountUpgrade upgrade)
    {
        foreach (var cannon in cannonList)
        {
            cannon.SetBullets(upgrade.GetBullets());
        }
    }
    
    public float GetPoints()
    {
        return points;
    }

    public void SetPoints(float nPoints)
    {
        points = nPoints;
        uiController.UpdatePointsText(points);
    }

    public void SpendPoints(float amount)
    {
        if (amount > points) return;
        points -= amount;
        uiController.UpdatePointsText(points);
    }

    public void GainPoints(float amount)
    {
        points += amount;
        uiController.UpdatePointsText(points);
    }
}

public enum GameState
{
    InGame,
    Loss
}