using System.Collections.Generic;
using uiwidgets;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.material;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using TextStyle = Unity.UIWidgets.painting.TextStyle;

namespace UIWidgetsSample.RaycastableScene
{
    public class PickListItem
    {
        public string itemName;
        public bool active;
        public string showName;

        public PickListItem(string itemName, bool active = true, string showName = null)
        {
            this.itemName = itemName;
            this.active = active;
            this.showName = showName ?? itemName;
        }
    }

    public delegate void OnItemSelected(int itemIndex);

    public delegate void OnItemChecked(int itemIndex, bool active);
    
    public class LeftUIPanel : StatefulWidget
    {
        public LeftUIPanel(Key key = null,
            List<PickListItem> itemNames = null,
            OnItemChecked itemCheckCallback = null,
            OnItemSelected itemSelectCallback = null) : base(key: key)
        {
            this.itemNames = itemNames ?? new List<PickListItem>();
            this.itemCheckCallback = itemCheckCallback;
            this.itemSelectCallback = itemSelectCallback;
        }
        
        public readonly List<PickListItem> itemNames;
        public readonly OnItemChecked itemCheckCallback;
        public readonly OnItemSelected itemSelectCallback;
        
        public override State createState()
        {
            return new LeftUIPanelState();
        }
    }

    public class LeftUIPanelState : State<LeftUIPanel>
    {
        readonly TextEditingController controller = new TextEditingController();
        public override Widget build(BuildContext context)
        {
            return new Column(
                children: new List<Widget>
                    {
                        buildSearchBar(),
                        buildItemList()
                    }
                );
        }

        public override void initState()
        {
            base.initState();
            _searchResult.AddRange(widget.itemNames);
        }

        private readonly List<PickListItem> _searchResult = new List<PickListItem>();
        private int selectedIndex = -1;

        private Widget buildSearchBar()
        {
            return new Container(
                color: Colors.grey,
                child: new Padding(
                    padding: EdgeInsets.all(1.0f),
                    child:
                    new Card(
                        child: new Row(
                            children: new List<Widget>{
                                new Padding(padding: EdgeInsets.only(left: 2f)),
                            new Icon(Icons.search, size: 14f),
                            new Flexible(child: new TextField(
                                controller: controller,
                                style: new TextStyle(fontSize: 8f),
                                decoration: new InputDecoration(
                                    hintText: "Search", border: InputBorder.none,
                                    contentPadding: EdgeInsets.all(4),
                                    isDense: true),
                                onChanged: onSearchTextChanged
                            )),
                            new GestureDetector(
                                child: new Icon(Icons.cancel, size: 10f),
                                onTap: () =>
                                {
                                    controller.clear();
                                    onSearchTextChanged("");
                                }
                                ),
                            new Padding(padding: EdgeInsets.only(right: 2f))
                        }))));
        }

        private Widget buildItemList()
        {
            return new Expanded(
                child: _searchResult.Count != 0 ?
                    (Widget) ListView.builder(itemCount: _searchResult.Count,
                        itemBuilder: (build_context, index) =>
                        {
                            return new Container(
                                child: new Padding(
                                    padding: EdgeInsets.only(left: 4.0f, right: 4f),
                                child: new Card(
                                    shape:new RoundedRectangleBorder(
                                        borderRadius: BorderRadius.all(Radius.circular(2.0f))
                                    ),
                                    margin: EdgeInsets.all(1),
                                    child: new GestureDetector(
                                        onTap: () =>
                                        {
                                            setState(() =>
                                            {
                                                selectedIndex = index;
                                                GameObjectManager.FocusOnObject(_searchResult[index].itemName);
                                                widget.itemSelectCallback?.Invoke(selectedIndex);
                                            });
                                        },
                                        child: new AnimateButton(
                                            selected: selectedIndex == index,
                                            child: new Row(
                                        children: new List<Widget> {
                                            new Padding(padding: EdgeInsets.only(left: 2f)),
                                            new Checkbox(value: _searchResult[index].active, onChanged: (value) =>
                                            {
                                                if (value == null)
                                                {
                                                    return;
                                                }
                                                setState(() =>
                                                {
                                                    _searchResult[index].active = value.Value;
                                                    if (value.Value)
                                                    {
                                                        GameObjectManager.MoveCenter(_searchResult[index].itemName);
                                                    }
                                                    else
                                                    {
                                                        GameObjectManager.MoveFar(_searchResult[index].itemName);
                                                    }
                                                    widget.itemCheckCallback?.Invoke(index, value.Value);
                                                });
                                            }),
                                            new Text(_searchResult[index].showName, style: new TextStyle(fontSize: 8f))
                                        }
                                        )
                                )))));
                        }) : new Center(
                            child: new Text("No Available Item", style: new TextStyle(fontSize: 8f))
                        )
                    );
        }

        private void onSearchTextChanged(string text)
        {
            _searchResult.Clear();
            if (text.isEmpty())
            {
                _searchResult.AddRange(widget.itemNames);
            }
            else
            {
                foreach (var item in widget.itemNames)
                {
                    if (item.showName.StartsWith(text))
                    {
                        _searchResult.Add(item);
                    }
                }
            }
            
            setState(() => {});
        }
    }
}