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using UnityEngine;
using UnityEngine.Events;
using PixelCrushers.DialogueSystem;

public class QuestTimer : MonoBehaviour
{
    public string timerVariable;
    public float maxTime;
    public bool startTimerImmediately;
    public UnityEvent onTimerStart = new UnityEvent();
    public UnityEvent onTimerEnd = new UnityEvent();

    private float timeLeft = 0;

    private void Start()
    {
        // Check if we need to start the timer as soon as the scene starts:
        if (startTimerImmediately) StartTimer();
    }

    public void StartTimer()
    {
        // To start the timer, set timeLeft to maxTime and invoke the notification events:
        timeLeft = maxTime;
        onTimerStart.Invoke();
        DialogueManager.SendUpdateTracker();
    }

    private void Update()
    {
        // Every frame, check timeLeft:
        if (timeLeft > 0)
        {
            var prevTimeLeft = timeLeft;
            timeLeft -= Time.deltaTime;
            var timeLeftInt = Mathf.FloorToInt(timeLeft);
            // If we crossed a whole second boundary, update variable:
            if (timeLeftInt != Mathf.FloorToInt(prevTimeLeft))
            {
                DialogueLua.SetVariable(timerVariable, Mathf.FloorToInt(timeLeft));
                DialogueManager.SendUpdateTracker();
            }
            if (timeLeftInt == 0) onTimerEnd.Invoke();
        }
    }


    // Hook into save system so timer gets saved:

    private void OnEnable()
    {
        PersistentDataManager.RegisterPersistentData(gameObject);
    }

    private void OnDisable()
    {
        PersistentDataManager.UnregisterPersistentData(gameObject);
    }

    public void OnApplyPersistentData()
    {
        timeLeft = DialogueLua.GetVariable(timerVariable).AsFloat;
    }
}