using System;
using UnityEngine;

public class InternetCheckSystem : MonoBehaviour
{
    public event Action OnCheckSuccess;
    public event Action OnCheckFailed;
    
    [SerializeField] private string pingAddress = "8.8.8.8";
    [SerializeField] private float pingTimeOut = 2f;
    [SerializeField] private int pingRetries = 3;

    private Ping _ping;
    private int _pingCount;
    private float _startTime;
    private bool _isPinging;

    public void CheckInternet()
    {
        _ping?.DestroyPing();
        
        if (_pingCount >= pingRetries)
        {
            Debug.Log("** Connection Unavailable!");
            OnCheckFailed?.Invoke();
            OnCheckFailed = null;
            return;
        }

        _ping = new Ping(pingAddress);
        _isPinging = true;
        _startTime = Time.time;
        _pingCount++;
        Debug.Log($"ping [{_pingCount}] has started");
    }

    private void Update()
    {
        if (!_isPinging) return;

        Debug.Log("ping on-going...");
        // Debug.Log($"StartTime: {_startTime}, CurrentTime: {Time.time}");
        
        if (Time.time >= _startTime + pingTimeOut)
        {
            Debug.Log($"ping [{_pingCount}] time out");
            _isPinging = false;
            CheckInternet();
            return;
        }


        if (!_ping.isDone) return;
        if (_ping.time <= 0) return;
        
        _isPinging = false;
        Debug.Log("** Internet Available!!!");
        OnCheckSuccess?.Invoke();
        OnCheckSuccess = null;
    }
}