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

public class EventSystemController : MonoBehaviour
{
    public GameObject firstSelectedButton;
    [SerializeField] private EventSystem eventSystem;
    [SerializeField] private StandaloneInputModule standaloneInputModule;

    public float navigationDelay = 0.2f; // Delay between button selections

    private float navigationTimer = 0f;
    private bool canNavigate = true;

    public Slider lastSelectedSlider;
    public float dpadSensitivity = 0.1f;

    private bool updateControllerControls = true;
    private bool updateKeyboardMouseControls = true;

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

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

    private void Start()
    {
        eventSystem = FindObjectOfType<EventSystem>();
        standaloneInputModule = FindObjectOfType<StandaloneInputModule>();
    }

    private void Update()
    {
        if (InputControlManager.Getinstance().IsUsingJoystick)
        {
            if (updateControllerControls)
            {
                eventSystem.SetSelectedGameObject(firstSelectedButton);
                standaloneInputModule.horizontalAxis = "Joystick Horizontal";
                standaloneInputModule.verticalAxis = "Joystick Vertical";
                updateKeyboardMouseControls = true;
                updateControllerControls = false;
            }
        }
        else
        {
            if (updateKeyboardMouseControls)
            {
                eventSystem.SetSelectedGameObject(firstSelectedButton);
                standaloneInputModule.horizontalAxis = "Horizontal";
                standaloneInputModule.verticalAxis = "Vertical";
                updateKeyboardMouseControls = false;
                updateControllerControls = true;
            }
        }

        //if (EventSystem.current.currentSelectedGameObject == null)
        //{
        //    EventSystem.current.SetSelectedGameObject(firstSelectedButton);
        //}

        // Read input values for navigation axes
        float horizontalInput = Input.GetAxis("DpadHorizontal");
        float verticalInput = Input.GetAxis("DpadVertical");
        // Check if enough time has passed to allow button navigation
        if (!canNavigate)
        {
            navigationTimer += Time.unscaledDeltaTime;
            if (navigationTimer >= navigationDelay)
            {
                canNavigate = true;
                navigationTimer = 0f;
            }
        }

        // Select the next button based on the input values
        if (canNavigate)
        {
            if (EventSystem.current.currentSelectedGameObject != null)
            {
                if (horizontalInput > 0.1f)
                {
                    Selectable nextButton = EventSystem.current.currentSelectedGameObject.GetComponent<Selectable>().FindSelectableOnRight();
                    if (nextButton != null)
                    {
                        EventSystem.current.SetSelectedGameObject(nextButton.gameObject);
                        canNavigate = false;
                    }
                }
                else if (horizontalInput < -0.1f)
                {
                    Selectable nextButton = EventSystem.current.currentSelectedGameObject.GetComponent<Selectable>().FindSelectableOnLeft();
                    if (nextButton != null)
                    {
                        EventSystem.current.SetSelectedGameObject(nextButton.gameObject);
                        canNavigate = false;
                    }
                }
                else if (verticalInput > 0.1f)
                {
                    Selectable nextButton = EventSystem.current.currentSelectedGameObject.GetComponent<Selectable>().FindSelectableOnUp();
                    if (nextButton != null)
                    {
                        EventSystem.current.SetSelectedGameObject(nextButton.gameObject);
                        canNavigate = false;
                    }
                }
                else if (verticalInput < -0.1f)
                {
                    Selectable nextButton = EventSystem.current.currentSelectedGameObject.GetComponent<Selectable>().FindSelectableOnDown();
                    if (nextButton != null)
                    {
                        EventSystem.current.SetSelectedGameObject(nextButton.gameObject);
                        canNavigate = false;
                    }
                }

                // Find currently selected slider
                Slider selectedSlider = FindSelectedSlider();

                // If a slider is selected and it's different from the last selected one, update the last selected slider
                if (selectedSlider != null && selectedSlider != lastSelectedSlider)
                {
                    lastSelectedSlider = selectedSlider;
                }
                // If no slider is selected, set lastSelectedSlider to null
                if (selectedSlider == null)
                {
                    lastSelectedSlider = null;
                }

                // If a slider is selected, adjust its value based on D-pad input
                if (lastSelectedSlider != null)
                {
                    if (Mathf.Abs(horizontalInput) > dpadSensitivity)
                    {
                        lastSelectedSlider.value -= horizontalInput;
                    }
                    //else if (Mathf.Abs(verticalInput) > dpadSensitivity)
                    //{
                    //    lastSelectedSlider.value += verticalInput;
                    //}
                }
            }

          
        }
    }


    Slider FindSelectedSlider()
    {
        // Get the currently selected game object
        GameObject selectedGameObject = EventSystem.current.currentSelectedGameObject;

        // If the selected game object is a slider, return it
        if (selectedGameObject != null)
        {
            Slider slider = selectedGameObject.GetComponent<Slider>();
            if (slider != null)
            {
                return slider;
            }
        }

        return null; // No slider is currently selected
    }
}