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

namespace RPGCoreCommon.Helpers.Editor.UIElements
{
    public class SearchFieldPopup : PopupWindowContent
    {
        // Elements
        private VisualElement _root;
        private ToolbarSearchField _searchField;
        private ScrollView _scrollView;
        
        // Runtime
        private VisualElement _boundTo;
        private Dictionary<string, Action> _menuItems;
        
        public SearchFieldPopup(VisualElement boundTo, Dictionary<string, Action> menuItems)
        {
            _boundTo = boundTo;
            _menuItems = menuItems;
        }

        public override VisualElement CreateGUI()
        {
            _root = new VisualElement();
            _root.style.maxHeight = 500;
            _root.style.maxWidth = _boundTo.worldBound.width;
            
            _searchField = new ToolbarSearchField();
            _searchField.style.left = _searchField.style.right = 0;
            _searchField.style.width = StyleKeyword.Auto;
            
            _root.Add(_searchField);
            
            _scrollView = new ScrollView();
            _root.Add(_scrollView);

            // Show all options
            _menuItems.DictSelect((name, action) => new Button(() =>
            {
                action();
                Close();
            }) { text = name }).ForEach(_scrollView.Add);

            // Do auto focus when appear
            _root.RegisterCallback<AttachToPanelEvent>(_ => _searchField.Focus());
            
            // ESC - close
            // ENTER - select first visible
            _root.RegisterCallback<KeyDownEvent>(ev =>
            {
                switch (ev.keyCode)
                {
                    case KeyCode.Escape:
                        Close();
                        break;
                    case KeyCode.Return:
                        SelectFirst();
                        break;
                    default:
                        ApplyFilter();
                        break;
                }
            }, TrickleDown.TrickleDown);
            
            return _root;
        }

        public void Show()
        {
            UnityEditor.PopupWindow.Show(_boundTo.worldBound, this);
        }

        public void Close()
        {
            editorWindow.Close();
        }

        private void SelectFirst()
        {
            _scrollView.Query<Button>().Visible().First().Click();
        }

        private void ApplyFilter()
        {
            _scrollView.Query<Button>()
                .ForEach(b => b.style.display = b.text.Contains(_searchField.value) ? DisplayStyle.Flex : DisplayStyle.None);
        }
    }
}