using System;
using UnityEngine;

public class GameManager : MonoBehaviour
{
    public Observer<float> Balance = new(500f);
    public static GameManager Instance;

    public bool IsBuildMode = false;
    private Tower selectedTower;

    public float health = 0;
    public float startHealth = 100;

    public int CurrentNumEnemies = 0;

    public float Volume = 10f;

    /// <summary>
    /// First param: isBuildMode
    /// </summary>
    public static event Action<bool> OnUpdateUIRequested;

    public Tower SelectedTower { get { return selectedTower; } set {
        if (selectedTower != null)
            selectedTower.TowerSelected(false);

        selectedTower = value;
        if (selectedTower != null)
            selectedTower.TowerSelected(true);
    }}

    private void Awake()
    {
        if (Instance != null)
        {
            Destroy(gameObject);
            return;

        }

        Instance = this;
        health = startHealth;
    }

    public void Reset()
    {
        foreach (var go in GameObject.FindObjectsByType<GameObject>(FindObjectsSortMode.None))
        {
            if (go != null && go != this.gameObject)
                Destroy(go);
        }
        Destroy(this.gameObject);
    }

    private void OnEnable()
    {
        MoneyManager.OnShopSelected += m_OnTowerShopSelected;
        TowerPlacementManager.OnTowerPlaced += m_finishBuildmode;
    }

    private void OnDisable()
    {
        MoneyManager.OnShopSelected -= m_OnTowerShopSelected;
        TowerPlacementManager.OnTowerPlaced -= m_finishBuildmode;
    }

    private void m_OnTowerShopSelected(TowerInfo info)
    {
        IsBuildMode = true;
        OnUpdateUIRequested?.Invoke(IsBuildMode);
    }

    private void m_finishBuildmode(TowerInfo info)
    {
        IsBuildMode = false;
        OnUpdateUIRequested?.Invoke(IsBuildMode);
    }
}