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

public class UISelectionManager : MonoBehaviour
{
    readonly List<Selectable> _selectables = new List<Selectable>();

    void Update()
    {
        if (ShouldRestoreSelection())
        {
            RestoreSelection();
            //if (EventSystem.current.currentSelectedGameObject != null)
            //{
            //    Debug.Log($"Current Selection: {EventSystem.current.currentSelectedGameObject.name}"); 
            //}
        }
    }

    void RestoreSelection()
    {
        gameObject.GetComponentsInChildren<Selectable>(includeInactive: false, _selectables);
        foreach (var selectable in _selectables)
        {
            if (!(selectable is TMP_InputField))
            {
                if (selectable.isActiveAndEnabled && selectable.interactable)
                {
                    selectable.Select();
                    break;
                }
            }
        }
    }

    static bool ShouldRestoreSelection()
    {
        if (HasValidSelection())
        {
            return false;
        }

        // The selection is permitted to be lost when a click is made outside of a selectable
        bool requireSelection = (!Input.mousePresent || Player.Instance.GetInputHandler().UsingGamePad);

        // Restore selection immediately or when any keyboard/controller input is detected.
        return requireSelection || IsAnyJoinedButtonDown();
    }

    static bool HasValidSelection()
    {
        var selected = EventSystem.current.currentSelectedGameObject;
        return (
          selected != null &&
          selected.activeInHierarchy &&
          selected.TryGetComponent<Selectable>(out var selectable) &&
          selectable.interactable
        );
    }

    static bool IsAnyJoinedButtonDown()
    {
        //for (var i = 0; i < 1; i++)
        //{
        //    var player = ReInput.players.GetPlayer(i);
        //    if (player.isPlaying && (player.GetAnyButton() || player.GetAnyNegativeButton()))
        //    {
        //        return true;
        //    }
        //}
        return false;
    }
}