using System;
using UnityEngine;

public class GameManager : MonoBehaviour
{
    [SerializeField] private float timeLimit = 60f;
    [SerializeField] private Health playerHealth;

    private float remainingTime;
    private GameState state = GameState.Ready;

    public float RemainingTime => remainingTime;
    public GameState State => state;
    public bool IsPlaying => state == GameState.Playing;

    public event Action<GameState> StateChanged;
    public event Action<float> TimeChanged;

    private void Start()
    {
        remainingTime = timeLimit;

        if (playerHealth != null)
        {
            playerHealth.Died += OnPlayerDied;
        }

        ChangeState(GameState.Playing);
        TimeChanged?.Invoke(remainingTime);
    }

    private void Update()
    {
        if (!IsPlaying)
        {
            return;
        }

        remainingTime = Mathf.Max(0f, remainingTime - Time.deltaTime);
        TimeChanged?.Invoke(remainingTime);

        if (remainingTime <= 0f)
        {
            ChangeState(GameState.Clear);
        }
    }

    private void OnDestroy()
    {
        if (playerHealth != null)
        {
            playerHealth.Died -= OnPlayerDied;
        }
    }

    private void OnPlayerDied()
    {
        ChangeState(GameState.GameOver);
    }

    private void ChangeState(GameState nextState)
    {
        if (state == nextState)
        {
            return;
        }

        state = nextState;
        StateChanged?.Invoke(state);
    }
}