using System;
using System.Linq;
using UnityEditor;
using UnityEditor.UIElements;
using UnityEngine;
using UnityEngine.UIElements;

namespace LanLib.Singleton.EditorUtilities
{
    public class SingletonWindow : EditorWindow
    {
        const int SourceUpdateInterval = 100;
        const string UIRootGuid = "f019694f4240ea24281a93f5aab2f756";
        const string UIElementGuid = "a33c335b67caf3e41af9c2753dcbb734";

        [MenuItem("Tools/LanLib/Singletons")]
        private static void ShowWindow()
        {
            var window = GetWindow<SingletonWindow>();
            window.titleContent = new GUIContent("Singletons");
            window.Show();
        }

        private void CreateGUI()
        {
            var uiRootAsset = GetVisualTreeAssetByGUID(UIRootGuid);
            var uiElementAsset = GetVisualTreeAssetByGUID(UIElementGuid);
            uiRootAsset.CloneTree(rootVisualElement);
            var lst = rootVisualElement.Q<ListView>("lst");
            (lst.makeItem, lst.bindItem) = BindItem();
            rootVisualElement.schedule.Execute(UpdateSource).Every(SourceUpdateInterval);

            (Func<VisualElement>, Action<VisualElement, int>) BindItem()
            {
                // GameObject    gameObject = null;
                // Label         txtName    = null;
                // VisualElement btnInspect = null;
                // VisualElement btnDestroy = null;
                // MaskField     mask       = null;
                return (OnCreate, OnBind);

                VisualElement OnCreate()
                {
                    var ele = uiElementAsset.CloneTree();
                    var txtName = ele.Q<Label>("txtName");
                    var btnInspect = ele.Q("btnInspect");
                    var btnDestroy = ele.Q("btnDestroy");
                    var mask = ele.Q<MaskField>("mask");
                    mask.choices = Enum.GetNames(typeof(HideFlags))[1..^2].ToList();
                    mask.RegisterValueChangedCallback(e =>
                    {
                        var go = GetGameObject();
                        if (go) go.hideFlags = (HideFlags)e.newValue;
                    });
                    btnDestroy.RegisterCallback<ClickEvent>(_ =>
                    {
                        var go = GetGameObject();
                        if (go) DestroyImmediate(go);
                    });
                    btnInspect.RegisterCallback<ClickEvent>(_ =>
                    {
                        var go = GetGameObject();
                        if (go) Selection.activeGameObject = go;
                        // EditorUtility.OpenPropertyEditor(go);
                    });
                    txtName.RegisterCallback<ClickEvent>(_ =>
                    {
                        var go = GetGameObject();
                        if (go) Selection.activeGameObject = go;
                    });
                    return ele;
                    GameObject GetGameObject() => ele.userData as GameObject;
                }

                void OnBind(VisualElement ele, int idx)
                {
                    var txtName = ele.Q<Label>("txtName");
                    var mask = ele.Q<MaskField>("mask");
                    var gameObject = lst.itemsSource[idx] as GameObject;
                    if (gameObject != null)
                    {
                        txtName.text = gameObject.name;
                        mask.value = (int)gameObject.hideFlags;
                        ele.userData = gameObject;
                    }
                }
            }

            void UpdateSource()
            {
                lst.itemsSource = Resources.FindObjectsOfTypeAll<SingletonBase>()
                    .Select(comp => comp.gameObject)
                    .Distinct()
                    .Where(o => o)
                    .ToList();
                lst.RefreshItems();
            }
        }

        VisualTreeAsset GetVisualTreeAssetByGUID(string guid) =>
            AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(AssetDatabase.GUIDToAssetPath(guid));
    }
}