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

public class KeyBoardNavigation : MonoBehaviour
{
    public static HashSet<KeyBoardNavigation> NavigationSet = new();
    public List<Button> buttons;

    public static bool IsNavigationButton(Button btn)
    {
        foreach (var item in NavigationSet)
        {
            if (item.buttons.Contains(btn)) return true;
        }
        return false;
    }

    public static Button Next(Button btn, int delta, bool first = false)
    {
        if (Mathf.Abs(delta) != 1) throw new System.Exception("delta only support 1 or -1");
        List<Button> buttons = btn.GetComponentInParent<KeyBoardNavigation>().buttons;
        if (buttons.Count == 0) throw new System.Exception("KeyBoardNavigation.buttons Is Empty");
        int index = first ? (delta < 0 ? buttons.Count : -1) : buttons.IndexOf(btn);
        if (delta < 0 && index < 0) index = buttons.Count;
        int maxCheckCount = buttons.Count;
        for (int i = 0; i < maxCheckCount; i++)
        {
            index += delta;
            if (index < 0) index += buttons.Count;
            index = index % buttons.Count;
            Button curBtn = buttons[index];
            if (curBtn && curBtn.gameObject && curBtn.gameObject.activeInHierarchy && curBtn.interactable)
            {
                return buttons[index];
            }
        }
        return null;
    }

    void Awake()
    {
        if (!CommonConfig.StandaloneMode)
        {
            Destroy(this);
        }
    }

    void OnEnable()
    {
        NavigationSet.Add(this);
    }

    void OnDisable()
    {
        if (NavigationSet.Contains(this))
        {
            NavigationSet.Remove(this);
        }
    }
}