using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Syncfusion.Data.Extensions;
using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using Syncfusion.Pdf.Parsing;
using Encoder = System.Drawing.Imaging.Encoder;
using Image = System.Windows.Controls.Image;
using System.Reflection;

namespace PRSDesktop
{
    /// <summary>
    /// Interaction logic for DataEntryPanel.xaml
    /// </summary>
    /// <remarks>
    /// This is a host because it has a singular code popup editor
    /// </remarks>
    public partial class DataEntryPanel : UserControl, IBasePanel, IDynamicEditorHost
    {
        IPopupEditorControl? Popup;


        public DataEntryPanel()
        {
            InitializeComponent();
        }

        public void Setup()
        {
            var types = CoreUtils.Entities
                .Where(x => x.IsAssignableTo(typeof(Entity))
                && x.HasInterface(typeof(IRemotable))
                && x.HasInterface(typeof(IPersistent))
                && x.GetCustomAttribute<AutoEntity>() is null
                && Security.CanEdit(x)
                && x.HasInterface<IScannable>())
                .Select(x => new Tuple<string, Type?>(x.Name, x)).OrderBy(x => x.Item1).ToList();
            types.Insert(0, new("", null));

            TypeBox.ItemsSource = types;
            TypeBox.DisplayMemberPath = "Item1";
            TypeBox.SelectedValuePath = "Item2";

            ScanPanel.Setup();
        }
        public void Refresh()
        {
            ScanPanel.Refresh();
        }

        public bool IsReady { get; set; }

        public string SectionName => "Data Entry";

        public DataModel DataModel(Selection selection)
        {
            return new EmptyDataModel();
        }

        public event DataModelUpdateEvent? OnUpdateDataModel;

        public void CreateToolbarButtons(IPanelHost host)
        {
            if (Security.IsAllowed<CanSetupScanTags>())
            {
                host.CreateSetupAction(new PanelAction
                {
                    Caption = "Scan Tags",
                    OnExecute = (action) =>
                    {
                        var list = new MasterList(typeof(ScanTag));
                        list.ShowDialog();
                    }
                });
            }
        }

        public void Heartbeat(TimeSpan time)
        {
        }


        public Dictionary<string, object[]> Selected()
        {
            return new Dictionary<string, object[]>();
        }

        public void Shutdown()
        {
            ScanPanel.Shutdown();
        }

        #region Host

        private HashSet<Type> _loadedTypes = new();

        public DynamicGridColumns Columns { get; set; } = new();

        IEnumerable<DynamicGridColumn> IDynamicEditorHost.Columns => Columns;

        public void LoadColumns(string column, Dictionary<string, string> columns)
        {
            var selectedType = TypeBox.SelectedValue as Type;
            if (selectedType is null) return;

            columns.Clear();

            foreach (var c in LookupFactory.DefineColumns(selectedType).ColumnNames().Where(x => x != "ID"))
            {
               columns.Add(c, c);
            }
            if (Popup?.EditorDefinition is CodePopupEditorControl codePopup && !columns.ContainsKey(codePopup.CodeColumn))
            {
                columns.Add(codePopup.CodeColumn, codePopup.CodeColumn);
            }
        }

        public IFilter? DefineFilter(Type type) => LookupFactory.DefineFilter(type);

        public void LoadLookups(ILookupEditorControl sender)
        {
            var editor = sender.EditorDefinition as ILookupEditor;
            var colname = sender.ColumnName;

            var values = editor.Values(colname, Editor.Items);
            sender.LoadLookups(values);
        }

        public Document? FindDocument(string filename) => null;

        public Document? GetDocument(Guid id) => null;

        public void SaveDocument(Document document) { }

        object?[] IDynamicEditorHost.GetItems() => Editor.Items;

        public BaseEditor? GetEditor(DynamicGridColumn column) => column.Editor.CloneEditor();

        #endregion

        private void ClearEditor(Type TEntity)
        {
            UpdateEditor(TEntity, null);

            if(Popup is not null)
            {
                Popup.Value = Guid.Empty;
            }
        }

        private bool EditorChanged = false;

        private IDynamicDataGrid UpdateEditor(Type TEntity, BaseObject[]? items)
        {
            DetailGrid.Children.Remove(Editor);

            Editor = new EmbeddedDynamicEditorForm();
            Editor.SetLayoutType<VerticalDynamicEditorGridLayout>();
            Editor.SetValue(Grid.RowProperty, 1);
            Editor.SetValue(Grid.ColumnProperty, 0);
            Editor.SetValue(Grid.ColumnSpanProperty, 4);

            EditorChanged = false;

            Editor.OnAfterEditorValueChanged += (sender, column) =>
            {
                EditorChanged = true;
                return null;
            };

            Editor.OnOK += () =>
            {
                var cancel = new System.ComponentModel.CancelEventArgs();
                Editor.SaveItem(cancel);
                if(!cancel.Cancel)
                    ClearEditor(TEntity);
            };
            Editor.OnCancel += () =>
            {
                ClearEditor(TEntity);
            };
            
            DetailGrid.Children.Add(Editor);

            var grid = DynamicGridUtils.CreateDynamicGrid(typeof(DynamicDataGrid<>), TEntity);
            grid.InitialiseEditorForm(Editor, items ?? new object[] { Activator.CreateInstance(TEntity)! });
            return (grid as IDynamicDataGrid)!;
        }

        private void TypeBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var selectedType = TypeBox.SelectedValue as Type;
            if (selectedType is not null)
            {
                var dataGrid = UpdateEditor(selectedType, null);
                var editorColumns = dataGrid.LoadEditorColumns();

                if (Popup is UIElement element)
                    DetailGrid.Children.Remove(element);

                var code = DatabaseSchema.Properties(selectedType)
                    .Where(x => x.Parent is null && (x.Editor is CodeEditor || x.Editor is UniqueCodeEditor)
                        && x.Editor.Editable != Editable.Hidden)
                    .FirstOrDefault();

                BaseEditor editor;
                if (code is not null)
                {
                    editor = new CodePopupEditor(selectedType) { CodeColumn = code.Name };
                    Popup = new CodePopupEditorControl { Margin = new Thickness(5), CodeColumn = code.Name };
                }
                else
                {
                    editor = new PopupEditor(selectedType);
                    Popup = new PopupEditorControl { Margin = new Thickness(5) };
                }
                if (Popup is IPopupEditorControl popupEditor)
                {
                    Popup.ColumnName = "ID";
                    popupEditor.Host = this;

                    Columns = new DynamicGridColumns();
                    Columns.ExtractColumns(selectedType);
                }
                var el = (Popup as UIElement)!;

                el.SetValue(Grid.RowProperty, 0);
                el.SetValue(Grid.ColumnProperty, 3);
                Popup.EditorDefinition = editor;
                Popup.OnEditorValueChanged += (s, v) =>
                {
                    var entityID = (Guid)v["ID"];
                    BaseObject[]? objs = null;
                    if (entityID != Guid.Empty)
                    {
                        var obj = Client.Create(selectedType)
                            .Query(
                                Filter.Create<Entity>(selectedType, x => x.ID).IsEqualTo(entityID),
                                editorColumns)
                            .ToObjects(selectedType)
                            .FirstOrDefault();
                        if (obj is not null)
                        {
                            objs = new BaseObject[] { obj };
                        }
                    }
                    UpdateEditor(selectedType, objs);
                };

                Popup.Configure();
                Popup.Loaded = true;

                DetailGrid.Children.Add(el);
            }
            else
            {
                DetailGrid.Children.Remove(Editor);
                if (Popup is UIElement el)
                    DetailGrid.Children.Remove(el);
            }
        }

        private void ScanPanel_OnSelectAppliesTo(string appliesTo)
        {
            if(CoreUtils.TryGetEntity(appliesTo, out var entity))
            {
                TypeBox.SelectedValue = entity;
            }
        }
    }
}