using System.Collections;
using BansheeGz.BGDatabase;
using UnityEngine;

/// <summary>
/// This is a preloader script for LiveUpdate plugin on WEBGL platform.
/// Place this script in the preloader scene.
/// Ready method is called once all data is loaded OR if timeout is expired, place you code in Ready method
///
/// Setup:
/// 1) Enable LiveUpdate plugin
/// 2) Make sure to toggle "Manual load" on in addons settings (Addons->LiveUpdate).
/// 3) Place this script in your preloader scene. Make sure you access database after Ready method is called
///
/// Explanation:
/// There is no way to load data from GoogleSheets synchronously on WEBGL platform.
/// So we need to load it asynchronously, and it can take several frames.
/// This script ensures data is updated and once it's updated Ready method is called   
/// 
/// </summary>
public class LiveUpdatePreloader : MonoBehaviour
{
	//this is a timeout in seconds in case OnLoadComplete is not called by some unexpected reason
	public float timeOut = 8;

	//to make sure "Ready" method is not called twice
	private bool readyIsCalled;
	
	void Start ()
	{
		var liveUpdate = BGRepo.I.Addons.Get<BGAddonLiveUpdate>();
		liveUpdate.OnLoadComplete += LoadCompleteCallback;
		liveUpdate.Load();
		StartCoroutine(WaitForTimeout());
	}

	private IEnumerator WaitForTimeout()
	{
		yield return new WaitForSecondsRealtime(timeOut);
		if (!readyIsCalled)
		{
			readyIsCalled = true;
			Ready();
		}
	}

	private void LoadCompleteCallback()
	{
		var liveUpdate = BGRepo.I.Addons.Get<BGAddonLiveUpdate>();
		liveUpdate.OnLoadComplete -= LoadCompleteCallback;
		if (readyIsCalled) return;
		
		readyIsCalled = true;
		Ready();
	}

	private void Ready()
	{
		//place your code here
	}
}