using System;
using System.Collections.Generic;
using System.Reflection;
using RosettaUI.UIToolkit.Builder;
using UnityEngine;
using UnityEngine.UIElements;

namespace RosettaUI.UIToolkit
{
    public class PopupMenuUIToolkit : IPopupMenuImplement
    {
        public void Show(IEnumerable<IMenuItem> menuItems, Vector2 screenPosition, Element targetElement)
        {
            var visualElement = UIToolkitBuilder.Instance.GetUIObj(targetElement);
            if (visualElement == null)
            {
                Debug.LogWarning("PopupMenuUIToolkit.Show: targetElement is not a VisualElement.");
                return;
            }

            var position = screenPosition;
            if (visualElement.panel.contextType == ContextType.Player)
            {
                position = RuntimePanelUtils.ScreenToPanel(visualElement.panel, screenPosition);
            }

            PopupMenuUtility.Show(menuItems, position, visualElement);
        }
    }

    public static class PopupMenuUtility
    {
        public static void Show(IEnumerable<IMenuItem> menuItems, Vector2 position, VisualElement targetElement, Action onClosed = null)
        {
            var menu = new NestedDropdownMenu();
            
            foreach (var item in menuItems)
            {
                switch (item)
                {
                    case MenuItemSeparator:
                        menu.AddSeparator(item.Name);
                        continue;
                    case MenuItem { isEnable: true } menuItem:
                        menu.AddItem(menuItem.name, menuItem.isChecked, menuItem.action);
                        break;
                    case MenuItem menuItem:
                        menu.AddDisabledItem(menuItem.name, menuItem.isChecked);
                        break;
                }
            }

            foreach (var singleMenu in menu.SingleMenus)
            {
                singleMenu.OuterContainer.AddBoxShadow();
            }
            
            menu.DropDown(
                new Rect() { position = position },
                targetElement,
                anchored: false,
                onClosed
            );
        }
    }
}