using UnityEngine.LowLevel;
using UnityEngine.UIElements;

namespace UnityEditor.U2D.Common
{
    internal class PlayerLoopInspector : EditorWindow
    {
        [MenuItem("internal:Window/Player Loop Inspector")]
        static void ShowWindow()
        {
            var wind = GetWindow<PlayerLoopInspector>(false, "Player Loop");
            wind.Show();
        }

        void OnEnable()
        {
            Refresh();
        }

        void Refresh()
        {
            rootVisualElement.Clear();
            rootVisualElement.Add(new Button(Refresh) { text = "Refresh" });
            var scrollView = new ScrollView();
            rootVisualElement.Add(scrollView);

            var loop = PlayerLoop.GetCurrentPlayerLoop();
            ShowSystems(scrollView.contentContainer, loop.subSystemList, 0);
        }

        static void ShowSystems(VisualElement root, PlayerLoopSystem[] systems, int indent)
        {
            foreach (var playerLoopSystem in systems)
            {
                if (playerLoopSystem.subSystemList != null)
                {
                    var foldout = new Foldout { text = playerLoopSystem.type.Name, style = { left = indent * 15 } };
                    root.Add(foldout);
                    ShowSystems(foldout, playerLoopSystem.subSystemList, indent + 1);
                }
                else
                {
                    root.Add(new Label(playerLoopSystem.type.Name) { style = { left = indent * 15 } });
                }
            }
        }
    }
}