using System;
using GameOff.Player;
using UnityEngine;

namespace GameOff.Core
{
    public class PlayerMain : MonoBehaviour
    {
        public static PlayerMain Instance { get; private set; }

        public event EventHandler<bool> OnStateUpdate;

        private PlayerInputHandler _inputHandler;

        private IState _currentState;
        private PlayerClassState _classState;
        private PlayerQuizState _quizState;
        
        private void Awake()
        {
            if (Instance)
            {
                Debug.LogError($"PlayerMain already exist! {transform}");
                Destroy(gameObject);
                return;
            }

            Instance = this;
            _inputHandler = GetComponent<PlayerInputHandler>();
        }

        private void Start()
        {
            _inputHandler.OnChangeState += InputHandler_OnChangeState;

            _classState = new PlayerClassState();
            _quizState = new PlayerQuizState();
            _currentState = _classState;
        }

        private void Update()
        {
            _currentState.UpdateState();
        }

        private void InputHandler_OnChangeState(object sender, EventArgs e)
        {
            bool isQuiz = _currentState is PlayerQuizState;
            ChangeState(isQuiz ? _classState: _quizState);
            OnStateUpdate?.Invoke(this, !isQuiz);
        }

        private void ChangeState(IState next)
        {
            _currentState.ExitState();
            _currentState = next;
            _currentState.EnterState();
        }
    }
}