using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace NEG.UI.UnityUi.Buttons
{
    public class CustomNavigationButton : Button
    {
        [SerializeField] [HideInInspector] private OverridableNavigation upOverride;
        [SerializeField] private OverridableNavigation downOverride;
        [SerializeField] private OverridableNavigation leftOverride;
        [SerializeField] private OverridableNavigation rightOverride;


        public override void OnMove(AxisEventData eventData)
        {
            switch (eventData.moveDir)
            {
                case MoveDirection.Left:
                    if (TryNavigate(eventData, leftOverride))
                        return;
                    break;
                case MoveDirection.Up:
                    if (TryNavigate(eventData, upOverride))
                        return;
                    break;
                case MoveDirection.Right:
                    if (TryNavigate(eventData, rightOverride))
                        return;
                    break;
                case MoveDirection.Down:
                    if (TryNavigate(eventData, downOverride))
                        return;
                    break;
                case MoveDirection.None:
                    break;
                default:
                    throw new ArgumentOutOfRangeException();
            }

            base.OnMove(eventData);
        }

        public static bool TryNavigate(BaseEventData eventData, OverridableNavigation overrideNavigation)
        {
            if (!overrideNavigation.Override)
                return false;

            if (overrideNavigation.Selectable == null || !overrideNavigation.Selectable.IsActive())
                return true;

            eventData.selectedObject = overrideNavigation.Selectable.gameObject;
            return true;
        }
    }

    [Serializable]
    public class OverridableNavigation
    {
        [field: SerializeField] public bool Override { get; private set; }
        [field: SerializeField] public Selectable Selectable { get; private set; }
    }
}