// 本脚本只在不存在时会生成一次。组件逻辑写在当前脚本内。已存在不会再次生成覆盖 

using System;
using System.Collections.Generic;
using UnityEngine;
using FairyGUI;
using NBC;

namespace NBF
{
    public partial class ClassifyList : GComponent
    {
        private readonly List<object> _listData = new List<object>();

        public event Action<object> OnClickItem;

        private int _columnsCount;

        private void OnInited()
        {
            Game.Input.OnUICanceled += OnUICanceled;
        }

        public override void Dispose()
        {
            Game.Input.OnUICanceled -= OnUICanceled;
            base.Dispose();
        }

        private void OnUICanceled(string action)
        {
            if (action == InputDef.UI.Right)
            {
                SetListSelected(List.selectedIndex + 1);
            }
            else if (action == InputDef.UI.Left)
            {
                SetListSelected(List.selectedIndex - 1);
            }
            else if (action == InputDef.UI.Up)
            {
                SetListSelected(List.selectedIndex - _columnsCount);
            }
            else if (action == InputDef.UI.Down)
            {
                if (List.selectedIndex < 0)
                {
                    SetListSelected(0);
                }
                else
                {
                    SetListSelected(List.selectedIndex + _columnsCount);
                }
            }
        }

        private void SetListSelected(int selectedIndex)
        {
            if (selectedIndex >= 0 && selectedIndex < _listData.Count)
            {
                List.selectedIndex = selectedIndex;
                List.ScrollToView(List.selectedIndex);
            }
        }

        public void SetListData(List<object> listData,
            ListSelectionMode selectionMode = ListSelectionMode.Single)
        {
            List.selectedIndex = -1;
            List.defaultItem = ListTitleItem.URL;
            List.itemProvider = GetListItemResource;
            List.itemRenderer = OnRenderItem;
            List.onClickItem.Add(OnClickListItem);
            // List.SetVirtual();
            _listData.Clear();

            foreach (var obj in listData)
            {
                _listData.Add(obj);
            }

            List.selectionMode = selectionMode;
            List.numItems = _listData.Count;
            List.ScrollToView(0);
            _columnsCount = 5;
        }

        void OnClickListItem(EventContext context)
        {
            OnClickItem?.Invoke(context.data);
        }

        void OnRenderItem(int index, GObject obj)
        {
            if (obj is ListItemBase item)
            {
                item.SetData(_listData[index]);
                obj.SetSize(350, 300);
            }
            else if (obj is ListTitleItem titleItem)
            {
                titleItem.SetSize(List.width, 32);
            }
        }
        

        //根据索引的不同，返回不同的资源URL
        string GetListItemResource(int index)
        {
            var itemData = _listData[index];

            if (itemData is ShopGearData)
            {
                return ShopGearItem.URL;
            }

            if (itemData is string title)
            {
                return ListTitleItem.URL;
            }

            return List.defaultItem;
        }
    }
}