using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;

namespace BITKit.UX
{
    public class CycleContainer : VisualElement
    {
        public new class UxmlTraits : VisualElement.UxmlTraits
        {
            private readonly UxmlIntAttributeDescription m_currentTabAttribute = new ()
            {
                name = "CurrentIndex",
                defaultValue = -1
            };
            private readonly UxmlStringAttributeDescription m_customTabPathAttribute = new ()
            {
                name = "CurrentButtonPath",
            };

            public override void Init(VisualElement ve, IUxmlAttributes bag, CreationContext cc)
            {
                base.Init(ve, bag, cc);
                var self = (CycleContainer)ve;
                self.Index = m_currentTabAttribute.GetValueFromBag(bag, cc);
                self.CurrentButtonPath = m_customTabPathAttribute.GetValueFromBag(bag, cc);
            }
        }
        public new class UxmlFactory : UxmlFactory<CycleContainer, UxmlTraits> { }

        public CycleContainer()
        {
            RegisterCallback<AttachToPanelEvent>(OnAttachToPanel);
            RegisterCallback<DetachFromPanelEvent>(OnDetachFromPanel);
        }

        private void OnDetachFromPanel(DetachFromPanelEvent evt)
        {
            RebuildInternal();
        }

        private void OnAttachToPanel(AttachToPanelEvent evt)
        {
            RebuildInternal();
        }


        public int Index
        {
            get=>_index;
            set
            {
                _index = value;
                RebuildInternal();
            }
        }
        private int _index;
        public string CurrentButtonPath
        {
            get=>_currentButtonPath;
            set
            {
                _currentButtonPath=value;
                RebuildInternal();
            }
        }
        private string _currentButtonPath;
        

        
        private Button _currentButton;
        public void Cycle()
        {
            _index++;
            if (_index >= childCount)
            {
                _index = 0;
            }
            for (var i = 0; i < childCount; i++)
            {
                this[i].style.display = i == _index ? DisplayStyle.Flex : DisplayStyle.None;
            }
        }
        
        private void RebuildInternal()
        {
            for (var i = 0; i < this.childCount; i++)
            {
                this[i].style.display = i == _index ? DisplayStyle.Flex : DisplayStyle.None;
            }
            if (panel is null) return;
            if (_currentButton is not null)
            {
                _currentButton.clickable = null;
            }
            
            _currentButton = panel.visualTree.Q<Button>(_currentButtonPath);
            
            if(_currentButton is null)return;
    
            _currentButton.clickable = null;
            _currentButton.clicked += Cycle;
        }
    }

}