using System;
using TemplateUnity.Core;
using UnityEngine;
using UnityEngine.UI;

namespace TemplateUnity.MainMenu
{
    public class UIMainSection : UICore
    {
        public static UIMainSection Instance { get; private set; }

        public event EventHandler onNewGameTrigger;
        public event EventHandler onContinueTrigger;
        public event EventHandler onOptionsTrigger;
        public event EventHandler onQuitTrigger;
        
        [Header("Buttons")]
        [SerializeField] private Button newGameButton;
        [SerializeField] private Button continueButton;
        [SerializeField] private Button optionsButton;
        [SerializeField] private Button quitButton;
        
        private Button _lastSelectedButton;

        private void Awake()
        {
            if (Instance)
            {
                Debug.LogWarning($"{typeof(UIMainSection)} already instantiated! {transform}");
                Destroy(gameObject);
                return;
            }
            
            Instance = this;
        }

        private void OnEnable()
        {
            if(_lastSelectedButton)
                _lastSelectedButton.Select();
        }

        private void Start()
        {
            newGameButton.onClick.AddListener(() => onNewGameTrigger?.Invoke(this, EventArgs.Empty));
            continueButton.onClick.AddListener(() => onContinueTrigger?.Invoke(this, EventArgs.Empty));
            optionsButton.onClick.AddListener(() =>
            {
                _lastSelectedButton = optionsButton;
                onOptionsTrigger?.Invoke(this, EventArgs.Empty);
            });
            quitButton.onClick.AddListener(() => onQuitTrigger?.Invoke(this, EventArgs.Empty));
            
            MainMenuManager.Instance.onMainSectionReveal += (_, _) => Show();
            MainMenuManager.Instance.onSaveSectionReveal += (_, _) => Hide();
            MainMenuManager.Instance.onOptionsSectionReveal += (_, _) => Hide();

            _lastSelectedButton = newGameButton;
            _lastSelectedButton.Select();
        }
    }
}