using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
public class LoadingScreen : MonoBehaviour
{
    public static LoadingScreen instance;
    CanvasGroup canvasGroup;
    public Slider loadingProgress;
    public TMPro.TMP_Text loadingProgressTxt;
    private static bool loading;
    public static bool Loading => loading;

    void Awake(){
        instance =this;
    }
    void Start()
    {
        DontDestroyOnLoad(gameObject);
        canvasGroup = GetComponent<CanvasGroup>(); 
    }

    public void LoadLevel(string levelName){
        if(loading){return;}loading=true;
        StartCoroutine(loadlLevel(levelName));
    }

    IEnumerator loadlLevel(string levelName){
        loading=true;
        canvasGroup.alpha=0;
        canvasGroup.blocksRaycasts=true;
        SetProgress(0);
        while(canvasGroup.alpha< 1f){
            canvasGroup.alpha+=0.03f;
            yield return new WaitForFixedUpdate();
        }
        while(RegionManager.selectedServer == null){
            loadingProgressTxt.text = "Preparing";
            yield return new WaitForSeconds(0.5f);
        }
        AsyncOperation asyncOperation = SceneManager.LoadSceneAsync(levelName);
        // asyncOperation.allowSceneActivation = false;
        while (!asyncOperation.isDone)
        {
            //Output the current progress
            // m_Text.text = "Loading progress: " + (asyncOperation.progress * 100) + "%";
            // Check if the load has finished
            SetProgress(asyncOperation.progress);
            yield return null;
        }
        yield return new WaitForSeconds(0.2f);

        canvasGroup.blocksRaycasts=false;
    
        while(canvasGroup.alpha> 0){
            canvasGroup.alpha-=0.03f;
            yield return new WaitForFixedUpdate();
        }
        loading=false;
    }

    void SetProgress(float value){
        loadingProgress.value = value;
        loadingProgressTxt.text = (int)(value*100) + "%";
    }
}