using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;
using System.Collections.Generic;

namespace ProjectExporter
{
    public class ProjectExporterWindow : EditorWindow
    {
        private ProjectExporterController _controller;
        private VisualElement _rootElement;
        private VisualElement _contentContainer;
        private Dictionary<string, AssetModel> _assetTrees;
        private string _currentTab = "Scenes";

        [MenuItem("Tools/Project Exporter")]
        public static void ShowWindow()
        {
            ProjectExporterWindow wnd = GetWindow<ProjectExporterWindow>(true, "Project Exporter");
            wnd.minSize = new Vector2(400, 300);
        }

        private void OnEnable()
        {
            _controller = new ProjectExporterController();
            _assetTrees = new Dictionary<string, AssetModel>();
            _rootElement = rootVisualElement;

            // Build the UI frame without loading asset data initially
            BuildUI();
            
            // Trigger the first content refresh
            RefreshContent(_currentTab);
        }

        private void BuildUI()
        {
            _rootElement.Clear();

            var tabContainer = new VisualElement { style = { flexDirection = FlexDirection.Row } };
            tabContainer.Add(ProjectExporterUI.CreateTab("Scenes"));
            tabContainer.Add(ProjectExporterUI.CreateTab("Prefabs"));
            tabContainer.Add(ProjectExporterUI.CreateTab("Scriptable Objects"));
            tabContainer.Add(ProjectExporterUI.CreateTab("Meta Files"));
            tabContainer.Add(ProjectExporterUI.CreateTab("Settings"));
            _rootElement.Add(tabContainer);

            // Create a scrollable container for the main content
            var scrollView = new ScrollView(ScrollViewMode.Vertical);
            _rootElement.Add(scrollView);

            _contentContainer = ProjectExporterUI.CreateMainContainer();
            scrollView.Add(_contentContainer);

            var generateButton = ProjectExporterUI.CreateGenerateButton();
            _rootElement.Add(generateButton);
            generateButton.clicked += () => _controller.ExportAssets(_assetTrees[_currentTab]);

            var tabs = tabContainer.Query<Button>().ToList();
            tabs[0].clicked += () => RefreshContent("Scenes");
            tabs[1].clicked += () => RefreshContent("Prefabs");
            tabs[2].clicked += () => RefreshContent("Scriptable Objects");
            tabs[3].clicked += () => RefreshContent("Meta Files");
            tabs[4].clicked += () => RefreshContent("Settings");
        }

        private void RefreshContent(string tabName)
        {
            _currentTab = tabName;
            _contentContainer.Clear();

            // Load data on demand if it hasn't been loaded yet
            if (!_assetTrees.ContainsKey(tabName))
            {
                EditorUtility.DisplayProgressBar("Loading...", $"Fetching {tabName}...", 0.5f);
                try
                {
                    switch (tabName)
                    {
                        case "Scenes":
                            _assetTrees[tabName] = _controller.GetAssets("t:Scene");
                            break;
                        case "Prefabs":
                            _assetTrees[tabName] = _controller.GetAssets("t:Prefab");
                            break;
                        case "Scriptable Objects":
                            _assetTrees[tabName] = _controller.GetAssets("t:ScriptableObject");
                            break;
                        case "Meta Files":
                            _assetTrees[tabName] = _controller.GetAllMetaFiles();
                            break;
                        case "Settings":
                            _assetTrees[tabName] = _controller.GetProjectSettingsFiles();
                            break;
                    }
                }
                finally
                {
                    EditorUtility.ClearProgressBar();
                }
            }

            var rootModel = _assetTrees[tabName];
            if (rootModel != null)
            {
                foreach (var child in rootModel.Children)
                {
                    _contentContainer.Add(CreateAssetView(child, 0));
                }
            }
        }

        private VisualElement CreateAssetView(AssetModel model, int indentLevel)
        {
            const int indentWidth = 20;

            if (model.Children.Count > 0)
            {
                var row = new VisualElement { style = { flexDirection = FlexDirection.Row, alignItems = Align.Center, marginLeft = indentLevel * indentWidth } };
                var foldout = ProjectExporterUI.CreateFoldout(model.Name);
                foldout.style.flexGrow = 1;
                var toggle = new Toggle { value = model.IsSelected, text = "" };
                
                toggle.RegisterValueChangedCallback(evt => {
                    model.IsSelected = evt.newValue;
                    SetChildrenSelection(model, evt.newValue);
                    UpdateChildTogglesUI(foldout, evt.newValue);
                });

                row.Add(toggle);
                row.Add(foldout);

                foreach (var child in model.Children)
                {
                    foldout.Add(CreateAssetView(child, indentLevel + 1));
                }
                return row;
            }
            else
            {
                var toggle = ProjectExporterUI.CreateToggle(model.Name);
                toggle.style.marginLeft = (indentLevel + 1) * indentWidth;
                toggle.value = model.IsSelected;
                toggle.RegisterValueChangedCallback(evt => model.IsSelected = evt.newValue);
                return toggle;
            }
        }
        
        private void UpdateChildTogglesUI(VisualElement container, bool isSelected)
        {
            container.Query<Toggle>().ForEach(childToggle => {
                childToggle.SetValueWithoutNotify(isSelected);
            });
        }

        private void SetChildrenSelection(AssetModel parent, bool isSelected)
        {
            parent.IsSelected = isSelected;
            foreach (var child in parent.Children)
            {
                SetChildrenSelection(child, isSelected);
            }
        }
    }
}