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



public class InGameManager : MonoBehaviour
{

    [SerializeField]
    private Volume gameVolume;
    [SerializeField]
    private Volume pausedVolume;

    [SerializeField]
    private bool isPaused = false;
    private bool isTransitioning = false;

    [SerializeField]
    private float pauseTransitionDuration = 1f;

    [SerializeField]
    private Canvas gameCanvas;
    [SerializeField]
    private Canvas pausedCanvas;

    public bool IsPaused { get { return this.isPaused; } }

    public void TogglePause()
    {
        if (!isTransitioning)
        {
            isPaused = !isPaused;
            Cursor.visible = isPaused;
            if (!isPaused)
            {
                Cursor.lockState = CursorLockMode.Locked;
            }
            else
            {
                Cursor.lockState = CursorLockMode.None;
            }
            StartCoroutine(pauseTransition());

        }

    }
    public void UnPause()
    {
        if (!isTransitioning)
        {
            isPaused = false;
            Cursor.lockState = CursorLockMode.Locked;
            Cursor.visible = isPaused;
            StartCoroutine(pauseTransition());
        }
            
    }
    public void Pause()
    {
        if (!isTransitioning)
        {
            isPaused = true;
            Cursor.lockState = CursorLockMode.None;
            Cursor.visible = isPaused;
            StartCoroutine(pauseTransition());
        }
            
    }

    IEnumerator pauseTransition()
    {
        if (pausedCanvas.gameObject.activeInHierarchy && !isPaused)
        {
            pausedCanvas.gameObject.SetActive(false);
        }
        if (gameCanvas.gameObject.activeInHierarchy && isPaused)
        {
            gameCanvas.gameObject.SetActive(false);
        }

        this.isTransitioning = true;
        yield return new WaitForSeconds(0);
        this.isTransitioning = false;
        print("Unpause canvas?" + isPaused+","+pausedCanvas.gameObject.activeInHierarchy);
        if (!pausedCanvas.gameObject.activeInHierarchy && isPaused)
        {
            pausedCanvas.gameObject.SetActive(true);
            
        }
        if (!gameCanvas.gameObject.activeInHierarchy && !isPaused)
        {
            gameCanvas.gameObject.SetActive(true);
        }

    }
    
   

    // Start is called before the first frame update
    void Start()
    {
        isPaused = false;
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = isPaused;
        gameVolume.weight = 1;
        pausedVolume.weight = 0;
        gameCanvas.gameObject.SetActive(true);
        pausedCanvas.gameObject.SetActive(false);
        
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetButtonDown("Pause"))
        {
            this.TogglePause();
            print("Toggled!");
        }

        if (isTransitioning||true)
        {
            if (isPaused)
            {
                //transition into pause

                //gameVolume.weight = Mathf.Lerp(gameVolume.weight, 0, Time.deltaTime);
                //pausedVolume.weight = Mathf.Lerp(pausedVolume.weight, 1, Time.deltaTime);

                //gameVolume.weight = gameVolume.weight < 0.1 ? 0 : gameVolume.weight;
                //pausedVolume.weight = pausedVolume.weight > 0.9 ? 1 : pausedVolume.weight;
                gameVolume.weight = 0;
                pausedVolume.weight = 1;

            }
            else
            {
                //transition out of pause
                
                gameVolume.weight = 1;
                pausedVolume.weight = 0;
            }
        }
    }

    public void ExitToMenu()
    {
        SceneManager.LoadScene(0);
    }
}