using System;
using UnityEditor;
using UnityEditor.IMGUI.Controls;
using UnityEngine;
using UnityEngine.TestTools;

namespace BracerLib.Editor.Utility
{
    /// <summary>
    /// Referenced via https://github.com/marijnz/unity-autocomplete-search-field
    /// </summary>
    [Serializable]
    [Obsolete("Use Odin or some attribute-based item instead.")]
    [ExcludeFromCoverage]
    public class EditorSearchField
    {
        private static class Styles
        {
            public const float RESULT_HEIGHT = 20f;
            public const float RESULT_BORDER_WIDTH = 2f;
            public const float RESULT_MARGIN = 15f;
            public const float RESULT_LABEL_OFFSET = 2f;

            public static readonly GUIStyle ENTRY_EVEN;
            public static readonly GUIStyle ENTRY_ODD;
            public static readonly GUIStyle LABEL_STYLE;
            public static readonly GUIStyle RESULTS_BORDER_STYLE;

            static Styles()
            {
                ENTRY_EVEN = new GUIStyle("CN EntryBackEven");
                ENTRY_ODD = new GUIStyle("CN EntryBackOdd");
                RESULTS_BORDER_STYLE = new GUIStyle("hostview");

                LABEL_STYLE = new GUIStyle
                {
                    alignment = TextAnchor.MiddleLeft,
                    richText = true
                };
            }
        }

        private static void RepaintFocusedWindow()
        {
            if (EditorWindow.focusedWindow != null)
                EditorWindow.focusedWindow.Repaint();
        }

        private SearchField searchField;
        private string searchString;

        public event Action<string> OnInputChanged;

        public bool HasSearchString => !string.IsNullOrEmpty(SearchString);
        public string SearchString
        {
            get => searchString;
            set
            {
                searchString = value;
                OnGUI();
            }
        }

        public void OnGUI()
        {
            var rect = GUILayoutUtility.GetRect(1, 1, 18, 18, GUILayout.ExpandWidth(true));
            GUILayout.BeginHorizontal();

            DoSearchField(rect);

            GUILayout.EndHorizontal();
        }

        private void DoSearchField(Rect rect)
        {
            if (searchField == null)
                searchField = new SearchField();

            var result = searchField.OnGUI(rect, searchString);
            if (result != searchString)
                OnInputChanged?.Invoke(result);

            searchString = result;

            if (HasSearchbarFocused())
                RepaintFocusedWindow();
        }

        private bool HasSearchbarFocused() => GUIUtility.keyboardControl == searchField.searchFieldControlID;
    }
}