HighGroundRoyaleNetcode/Assets/SynchronizedTimer.cs

using System;
using Unity.Netcode;
using TMPro;
using UnityEngine;

public class SynchronizedTimer : NetworkBehaviour
{
    public event Action OnTimerEnd; // Ensure it's public

    [SerializeField] private TextMeshProUGUI timerText; // Reference to the TextMeshProUGUI component

    private NetworkVariable<float> timer = new NetworkVariable<float>(0f, NetworkVariableReadPermission.Everyone, NetworkVariableWritePermission.Server);
    private bool isTimerRunning = false;

    void Update()
    {
        if (IsServer && isTimerRunning)
        {
            // Decrease the timer only on the server
            timer.Value -= Time.deltaTime;

            if (timer.Value <= 0)
            {
                timer.Value = 0;
                isTimerRunning = false;
                OnTimerEnd?.Invoke(); // Trigger the event on the server
            }
        }

        // Update the UI on all clients
        UpdateTimerUI();
    }

    /// <summary>
    /// Starts the timer.
    /// </summary>
    /// <param name="time">The duration of the timer in seconds.</param>
    [ServerRpc(RequireOwnership = false)]
    public void StartTimerServerRpc(float time)
    {
        if (!isTimerRunning)
        {
            timer.Value = time;
            isTimerRunning = true;
        }
    }

    /// <summary>
    /// Gets the remaining time on the timer.
    /// </summary>
    /// <returns>The remaining time in seconds.</returns>
    public float GetRemainingTime()
    {
        return timer.Value;
    }

    // This method ensures the timer stays synchronized for clients
    private void OnEnable()
    {
        timer.OnValueChanged += OnTimerValueChanged;
    }

    private void OnDisable()
    {
        timer.OnValueChanged -= OnTimerValueChanged;
    }

    private void OnTimerValueChanged(float oldValue, float newValue)
    {
        if (!IsServer && newValue <= 0 && oldValue > 0)
        {
            OnTimerEnd?.Invoke(); // Trigger the event on clients when timer reaches zero
        }
    }

    /// <summary>
    /// Updates the TextMeshProUGUI with the remaining time.
    /// </summary>
    private void UpdateTimerUI()
    {
        if (timerText != null)
        {
            int minutes = Mathf.FloorToInt(timer.Value / 60);
            int seconds = Mathf.FloorToInt(timer.Value % 60);

            timerText.text = $"{minutes:D2}:{seconds:D2}";
        }
    }
}