using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

namespace SubAssetsToolbox.Editor
{
    internal class RenameSubAssetWindow : EditorWindow
    {
        [SerializeField] private VisualTreeAsset _visualTreeAsset;

        private Object _target;
        private TextField _nameField;
        private Button _renameButton;

        public static void Open(Object subAsset)
        {
            RenameSubAssetWindow window = GetWindow<RenameSubAssetWindow>(true, "Rename Sub-Asset");
            window._target = subAsset;
            window.minSize = new Vector2(300f, 70f);
            window.maxSize = new Vector2(300f, 70f);
            window.Populate();
            window.Show();
        }

        private void CreateGUI()
        {
            VisualElement root = rootVisualElement;
            VisualElement template = _visualTreeAsset.Instantiate();
            template.style.flexGrow = 1f;

            _nameField = template.Q<TextField>("NameField");
            _nameField.selectAllOnFocus = true;
            _nameField.RegisterValueChangedCallback(_ => UpdateRenameButton());
            _nameField.RegisterCallback<KeyUpEvent>(OnKeyUp);

            template.Q<Button>("CancelBtn").clicked += Close;
            _renameButton = template.Q<Button>("RenameBtn");
            _renameButton.clicked += PerformRename;

            root.Add(template);
            UpdateRenameButton();
        }

        private void OnKeyUp(KeyUpEvent evt)
        {
            switch (evt.keyCode)
            {
                case KeyCode.Return:
                case KeyCode.KeypadEnter:
                    PerformRename();
                    break;

                case KeyCode.Escape:
                    Close();
                    break;
            }
        }

        private void Populate()
        {
            _nameField.value = _target != null ? _target.name : "";
            UpdateRenameButton();
            _nameField.schedule.Execute(() =>
            {
                _nameField.Focus();
                _nameField.SelectAll();
            });
        }

        private void UpdateRenameButton()
        {
            bool valid = _target != null
                         && !string.IsNullOrWhiteSpace(_nameField.value)
                         && _nameField.value != _target.name;
            
            _renameButton.SetEnabled(valid);
        }

        private void PerformRename()
        {
            _target.name = _nameField.value;
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            Close();
        }
    }
}