using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class MenuManager : MonoBehaviour
{
    public Transform vcam;
    public Button btnPlay;
    public Button btnLeaderboard;
    public Button btnExit;

    public CanvasGroup loadingCanvasGroup;
    public BlockProgressBar progressBar;

    void Awake()
    {
        loadingCanvasGroup.alpha=1f;   
    }

    void Start()
    {
        btnPlay.onClick.AddListener(OnPlayClick);
        btnExit.onClick.AddListener(OnExitClick);

        StartCoroutine(LoadingScreen());
    }

    IEnumerator LoadingScreen()
    {
        progressBar.progress = 0f;
        while(progressBar.progress < 1f)
        {
            progressBar.progress += 0.1f;
            progressBar.progress = Mathf.Clamp01(progressBar.progress);
            yield return new WaitForSeconds(Random.Range(0.05f, 1f));
        }
        yield return new WaitForSeconds(0.8f);

        float alpha = 1f;
        while(alpha > 0){
            alpha-=Time.deltaTime * 3f;
            loadingCanvasGroup.alpha = alpha;
            yield return null;
        }

        loadingCanvasGroup.alpha=0;
        loadingCanvasGroup.blocksRaycasts=false;

    }
    void OnPlayClick()
    {
        StartCoroutine(PlayCoroutine());
    }


    IEnumerator PlayCoroutine(){
        progressBar.progress = 0;
        float camSpeed = 0f;
        float speed = 50f;
        while(camSpeed < GameManager.movespeed){
            float multiplier = Mathf.Clamp01(camSpeed / GameManager.movespeed);
            loadingCanvasGroup.alpha = multiplier;
            progressBar.progress = multiplier;
            camSpeed += Time.deltaTime * speed;
            vcam.position = new Vector3(vcam.position.x, vcam.position.y, vcam.position.z + camSpeed * Time.deltaTime);
            yield return null;
        }

        GameManager.Reset();
        SceneManager.LoadScene("GameScene");
    }

    void OnExitClick()
    {
        Application.Quit();
    }
}