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

public class PauseMenu : MonoBehaviour
{
    public static bool GameIsPaused = false;
    public GameObject pauseMenuUI;
    public GameObject pauseSettingsMenuUI;
    public GameObject pauseGraphicsSettingsMenuUI;
    public GameObject pauseAudioSettingsMenuUI;
    public GameObject pauseGameplaySettingsMenuUI;
    public GameObject pauseQuitToMainMenuQuestionMenuUI;
    public GameObject pauseQuitGameMenuUI;
    public Animator pauseMenuBackgroundPanelAnimator;

    [Header("Menus Buttons")]
    [SerializeField] private Button pauseMenuHomePanelFirstSelectedButton;
    [SerializeField] private Button settingsMenuPanelFirstSelectedButton;
    [SerializeField] private Button quitToMainMenuPanelFirstSelectedButton;
    [SerializeField] private Button quitGameMenuPanelFirstSelectedButton;
    [SerializeField] private TMP_Dropdown graphicsMenuPanelFirstSelectedButton;
    [SerializeField] private Slider audioSettingsMenuPanelFirstSelectedButton;
    [SerializeField] private Slider gameplaySettingsMenuPanelFirstSelectedButton;

    private static PauseMenu _instance;
    public static PauseMenu GetInstance() { return _instance; }

    private void Awake()
    {
        if (!_instance)
        {
            _instance = this;
        }
    }

    public enum PauseMenuState
    {
        Resumed,
        PauseMenuHome,
        PhotomodeMenu,
        SettingsMenu,
        GraphicsSettingsMenu,
        AudioSettingsMenu,
        GameplaySettingsMenu,
        QuitToMainMenuQuestionMenu,
        QuitGameQuestionMenu
    }

    public PauseMenuState pauseMenuState = PauseMenuState.Resumed;


    public void GoToResumed()
    {
        StartCoroutine(ResumeAfterSec());
    }

    IEnumerator ResumeAfterSec() 
    {
        yield return new WaitForSecondsRealtime(0.5f);
        UIManager.GetInstance().userInterfaceIsOnScreen = false;
        pauseMenuUI.SetActive(true);
        pauseSettingsMenuUI.SetActive(false);
        Resume();
        pauseMenuState = PauseMenuState.Resumed;
    }

    public void GoToPauseMenuHome()
    {
        UIManager.GetInstance().userInterfaceIsOnScreen = true;
        pauseMenuUI.SetActive(true);
        pauseSettingsMenuUI.SetActive(false);
        pauseQuitToMainMenuQuestionMenuUI.SetActive(false);
        pauseQuitGameMenuUI.SetActive(false);
        Pause();
        pauseMenuState = PauseMenuState.PauseMenuHome;
        EventSystemController.GetInstance().firstSelectedButton = pauseMenuHomePanelFirstSelectedButton.gameObject;
        EventSystem.current.SetSelectedGameObject(EventSystemController.GetInstance().firstSelectedButton);
    }

    public void GoToPhotomodeMenu() 
    {
        pauseMenuUI.SetActive(false);
        pauseGraphicsSettingsMenuUI.SetActive(false);
        pauseAudioSettingsMenuUI.SetActive(false);
        pauseGameplaySettingsMenuUI.SetActive(false);
        pauseSettingsMenuUI.SetActive(false);
        PhotomodeManager.GetInstance().HasPressedToOpenPhotoMode = true;
        pauseMenuState = PauseMenuState.PhotomodeMenu;
        //EventSystemController.GetInstance().firstSelectedButton = settingsMenuPanelFirstSelectedButton.gameObject;
        EventSystem.current.SetSelectedGameObject(EventSystemController.GetInstance().firstSelectedButton);
    }

    public void GoToSettingsMenu()
    {
        pauseMenuUI.SetActive(false);
        pauseGraphicsSettingsMenuUI.SetActive(false);
        pauseAudioSettingsMenuUI.SetActive(false);
        pauseGameplaySettingsMenuUI.SetActive(false);
        pauseSettingsMenuUI.SetActive(true);
        pauseMenuState = PauseMenuState.SettingsMenu;
        EventSystemController.GetInstance().firstSelectedButton = settingsMenuPanelFirstSelectedButton.gameObject;
        EventSystem.current.SetSelectedGameObject(EventSystemController.GetInstance().firstSelectedButton);
    }


    public void GoToGraphicsSettingsMenu()
    {
        pauseSettingsMenuUI.SetActive(false);
        pauseGraphicsSettingsMenuUI.SetActive(true);
        pauseMenuState = PauseMenuState.GraphicsSettingsMenu;
        EventSystemController.GetInstance().firstSelectedButton = graphicsMenuPanelFirstSelectedButton.gameObject;
        EventSystem.current.SetSelectedGameObject(EventSystemController.GetInstance().firstSelectedButton);
    }

    public void GoToAudioSettingsMenu()
    {
        pauseSettingsMenuUI.SetActive(false);
        pauseAudioSettingsMenuUI.SetActive(true);
        pauseMenuState = PauseMenuState.AudioSettingsMenu;
        EventSystemController.GetInstance().firstSelectedButton = audioSettingsMenuPanelFirstSelectedButton.gameObject;
        EventSystem.current.SetSelectedGameObject(EventSystemController.GetInstance().firstSelectedButton);
    }

    public void GoToGameplaySettingsMenu()
    {
        pauseSettingsMenuUI.SetActive(false);
        pauseAudioSettingsMenuUI.SetActive(false);
        pauseGameplaySettingsMenuUI.SetActive(true);
        pauseMenuState = PauseMenuState.GameplaySettingsMenu;
        EventSystemController.GetInstance().firstSelectedButton = gameplaySettingsMenuPanelFirstSelectedButton.gameObject;
        EventSystem.current.SetSelectedGameObject(EventSystemController.GetInstance().firstSelectedButton);
    }

    public void GoToQuitToMainMenuQuestion() 
    {
        pauseMenuUI.SetActive(false);
        pauseQuitToMainMenuQuestionMenuUI.SetActive(true);
        pauseMenuState = PauseMenuState.QuitToMainMenuQuestionMenu;
        EventSystemController.GetInstance().firstSelectedButton = quitToMainMenuPanelFirstSelectedButton.gameObject;
        EventSystem.current.SetSelectedGameObject(EventSystemController.GetInstance().firstSelectedButton);
    }

    public void GoToQuitGameQuestion()
    {
        pauseMenuUI.SetActive(false);
        pauseQuitGameMenuUI.SetActive(true);
        pauseMenuState = PauseMenuState.QuitGameQuestionMenu;
        EventSystemController.GetInstance().firstSelectedButton = quitGameMenuPanelFirstSelectedButton.gameObject;
        EventSystem.current.SetSelectedGameObject(EventSystemController.GetInstance().firstSelectedButton);
    }

    void Update()
    {
        #region Old way
        //if (Input.GetKeyDown(KeyCode.Escape))
        //{
        //    if (!GameplayController.GetInstance().IsOnState(GameplayController.State.InventoryMenu) 
        //        && !GameplayController.GetInstance().IsOnState(GameplayController.State.ImportantTutorialMessage)
        //        && !LoadManager.GetInstance().LoadingGame && !ExaminableItemData.GetInstance().IsExamining)
        //    {
        //        if (GameIsPaused)
        //        {
        //            Resume();
        //        }
        //        else
        //        {
        //            Pause();
        //        }
        //    }
        //}
        #endregion

        switch (pauseMenuState)
        {
            case PauseMenuState.Resumed:
                if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton7)/*Start button*/)
                {
                    if (!GameplayController.GetInstance().IsOnState(GameplayController.State.InventoryMenu)
                        && !GameplayController.GetInstance().IsOnState(GameplayController.State.ImportantTutorialMessage)
                        && !LoadManager.GetInstance().LoadingGame && !ExaminableItemData.GetInstance().IsExamining)
                    {
                        GoToPauseMenuHome();
                    }
                }
                break;
            case PauseMenuState.PauseMenuHome:
                if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton1)/*B button*/ || Input.GetKeyDown(KeyCode.JoystickButton7)/*Start button*/)
                {
                    if (!GameplayController.GetInstance().IsOnState(GameplayController.State.InventoryMenu)
                        && !GameplayController.GetInstance().IsOnState(GameplayController.State.ImportantTutorialMessage)
                        && !LoadManager.GetInstance().LoadingGame && !ExaminableItemData.GetInstance().IsExamining)
                    {
                        GoToResumed();
                    }
                }
                break;
            case PauseMenuState.PhotomodeMenu:
                //if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton1)/*B button*/)
                //{
                //    GoToPauseMenuHome();
                //}
                break;
            case PauseMenuState.SettingsMenu:
                if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton1)/*B button*/)
                {
                    GoToPauseMenuHome();
                }
                break;
            case PauseMenuState.GraphicsSettingsMenu:
                if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton1)/*B button*/)
                {
                    GoToSettingsMenu();
                }
                break;
            case PauseMenuState.AudioSettingsMenu:
                if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton1)/*B button*/)
                {
                    GoToSettingsMenu();
                }
                break;
            case PauseMenuState.GameplaySettingsMenu:
                if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton1)/*B button*/)
                {
                    GoToSettingsMenu();
                }
                break;
            case PauseMenuState.QuitToMainMenuQuestionMenu:
                if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton1)/*B button*/)
                {
                    GoToPauseMenuHome();
                }
                break;
            case PauseMenuState.QuitGameQuestionMenu:
                if (Input.GetKeyDown(KeyCode.Escape) || Input.GetKeyDown(KeyCode.JoystickButton1)/*B button*/)
                {
                    GoToPauseMenuHome();
                }
                break;
            default:
                break;
        }
    }

    public void Resume()
    {
        pauseMenuUI.SetActive(false);
        pauseMenuBackgroundPanelAnimator.SetBool("FadeIn", false);
        pauseSettingsMenuUI.SetActive(false);
        pauseGraphicsSettingsMenuUI.SetActive(false);
        pauseAudioSettingsMenuUI.SetActive(false);
        Time.timeScale = 1f;
        GameIsPaused = false;
        Cursor.lockState = CursorLockMode.Locked; 
        Cursor.visible = false;
        GameplayController.GetInstance().GoToGameplayState();
    }
    public void Pause()
    {
        pauseMenuUI.SetActive(true);
        pauseMenuBackgroundPanelAnimator.SetBool("FadeIn", true);
        Time.timeScale = 0f;
        GameIsPaused = true;
        Cursor.lockState = CursorLockMode.None;
        Cursor.visible = true;
        GameplayController.GetInstance().GoToPauseMenuState();
    }
    public void LoadMenu()
    {
        pauseMenuUI.SetActive(false);
        Time.timeScale = 1f;
        GameIsPaused = false;
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;

        //- I COMMENTED OUT TO SEE IF IT WORKS WITH THE LOAD!!!!!
        //GameSystemsManager.GetInstance().Systems.SetActive(false);

        //I ADDED TO SEE IF IT WORKS!!!!!!!!!
        Destroy(GameSystemsManager.GetInstance().transform.gameObject);
        //-------------------------------------------------------------

        GameplayController.GetInstance().GoToMainMenuState();
        //SaveSlotManager.GetInstance().LoadingScreen.SetActive(true);
        //SaveSlotManager.GetInstance().loadingUIAnimator.SetBool("FadeIn", true);
        //SceneManager.LoadScene("MainMenu");
        LoadManager.GetInstance().LoadMainMenu();
    }
    public void QuitGame()
    {
        Application.Quit();
    }

}