using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.Wpf;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using InABox.Configuration;
using PRSDesktop.Panels.DataEntry.Grids;

namespace PRSDesktop;


public class DataEntryPanelSettings : BaseObject, IUserConfigurationSettings
{
    private static readonly double DefaultCacheAge = 7;

    [NullEditor]
    public double PreviewWidth { get; set; }

    [Comment("Age of cached documents before they are deleted (days)")]
    [DoubleEditor]
    public double CacheAge { get; set; } = DefaultCacheAge;
}

/// <summary>
/// Interaction logic for DataEntryPanel.xaml
/// </summary>
public partial class DataEntryPanel : UserControl, IBasePanel, IDynamicEditorHost
{
    private DataEntryPanelSettings _settings;
    
    //IPopupEditorControl? _popup;
    private IDynamicDataGrid? _grid;
    
    private Type? _selectedType;

    // The id of the entity currently being edited.
    private Guid _entityID;
    // The id of the entity we selected from the grid, as it was when we selected it; this is to cancel, because the lookup for the item
    // updates _entityID, and we need to set it back when cancelling.
    private Guid _originalID;

    private bool _processenabled;

    private Entity? _entity;

    private Button? _process;

    private bool _isChanged;
    private bool IsChanged
    {
        get => _isChanged;
        set
        {
            if(_isChanged != value)
            {
                _isChanged = value;
                Editor.HideButtons = !value;
                if (_process != null)
                    _process.IsEnabled = value;
                _documents._dataEntryGrid.IsEnabled = !value;
            }
        }
    }
    
    public void Select(Type? type, Guid id)
    {
        ClearEditor();
        
        _selectedType = type;
        _entityID = id;

        if (_selectedType != null)
        {
            CreateEditor();
            PopulateEditor();
            //LoadPopup();
        }
    }
    
    private void ScanPanel_OnSelectScan(string appliesto, Guid entityid, bool processenabled)
    {
        _processenabled = processenabled;
        _originalID = entityid;
        Select(
            CoreUtils.GetEntityOrNull(appliesto),
            entityid
        );
    }
    
    public DataEntryPanel()
    {
        InitializeComponent();
        LoadSettings();
    }

    private void LoadSettings()
    {
        _settings = new UserConfiguration<DataEntryPanelSettings>().Load();
        _panel.AnchorWidth = _settings.PreviewWidth > 0.0F
            ? _settings.PreviewWidth
            : 500F;
    }

    public void Setup()
    {
        _documents.Setup();

        IsChanged = false;
    }
    
    public void Refresh()
    {
        if (CheckSaved())
        {
            _documents.Refresh();
            IsChanged = false;
        }
    }

    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<CanSetupDataEntryTags>())
        {
            host.CreateSetupAction(new PanelAction("Data Entry Tags", null, (action) =>
            {
                var list = new MasterList(typeof(DataEntryTag));
                list.ShowDialog();
            }));
            
            host.CreateSetupAction(new PanelAction("Settings", null, (action) =>
            {
                var settings = new UserConfiguration<DataEntryPanelSettings>().Load();

                var grid = new DynamicItemsListGrid<DataEntryPanelSettings>();
                if (grid.EditItems(new DataEntryPanelSettings[] { settings }))
                {
                    new UserConfiguration<DataEntryPanelSettings>().Save(settings);
                    LoadSettings();
                }
            }));
        }
    }

    public void Heartbeat(TimeSpan time)
    {
    }
    
    public Dictionary<string, object[]> Selected()
    {
        return new Dictionary<string, object[]>();
    }
    
    private void CheckSaved(CancelEventArgs cancel)
    {
        if (!_isChanged)
        {
            return;
        }
        var result = MessageBox.Show("You have changes that have not been saved; do you wish to save these changes?", "Save Changes?", MessageBoxButton.YesNoCancel);
        if (result == MessageBoxResult.Yes)
        {
            if (!Editor.Validate())
            {
                cancel.Cancel = true;
                return;
            }
            DoSave(false);
            if (!cancel.Cancel)
                MessageBox.Show("Item saved.");
        }
        else if (result == MessageBoxResult.Cancel)
        {
            cancel.Cancel = true;
        }
    }
    private bool CheckSaved()
    {
        var cancel = new CancelEventArgs();
        CheckSaved(cancel);
        return !cancel.Cancel;
    }

    public void Shutdown(CancelEventArgs? cancel)
    {
        if (cancel != null)
            CheckSaved(cancel);
        if (cancel?.Cancel != true) 
            _documents.Shutdown(cancel);
    }

    #region Host

    public Type GetEditorType() => _selectedType ?? typeof(BaseObject);

    public void LoadLookups(ILookupEditorControl sender)
    {
        var colname = sender.ColumnName;

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

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

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

    #endregion

    private void ClearEditor()
    {

        DetailBorder.Child = null;
        IsChanged = false;
        
        //if (_popup is UIElement element)
        //    DetailHeader.Children.Remove(element);
    }
    

    private void CreateEditor()
    {
        if (_selectedType == null)
            return;
        
        Editor = new EmbeddedDynamicEditorForm();
        
        if (_selectedType == typeof(Bill))
            Editor.SetLayoutType<SupplierBillEditDocumentLayout>();
        else
            Editor.SetLayoutType<VerticalDynamicEditorGridLayout>();
        
        Editor.HighlightButtons = true;
        Editor.HideButtons = true;
        Editor.SetValue(Grid.RowProperty, 1);
        Editor.SetValue(Grid.ColumnProperty, 0);
        Editor.SetValue(Grid.ColumnSpanProperty, 4);

        Editor.OnOK += () => { DoSave(false); };
        Editor.OnCancel += () =>
        {
            _entityID = _originalID;
            Select(_selectedType, _entityID);
        };
        Editor.OnChanged += (sender, args) => IsChanged = true;
        
        DetailBorder.Child = Editor;
        _grid = (DynamicGridUtils.CreateDynamicGrid(typeof(DynamicDataGrid<>), _selectedType) as IDynamicDataGrid)!;
        _grid.OnCustomiseEditor += (sender, items, column, editor) =>
        {
            if ((editor is BaseCodeEditor be) && editor.Editable.EditorVisible())
            {
                be.Buttons = new[]
                {
                    new EditorButton(null, "..", 30, DoLookup, false)
                };
            }
        };
        _grid.OnAfterEditorValueChangedEvent += (sender, args) =>
        {
            IsChanged = IsChanged || (_entity?.IsChanged() == true || _originalID != _entityID);
            return null;
        };

        if (_grid is DynamicDataGrid<JobDocumentSetMileStone> milestoneGrid)
        {
            milestoneGrid.OnValidate += (o, items, err) =>
            {
                if (items.Any(x => x.ID == Guid.Empty))
                {
                    err.Add("Cannot create a new milestone from Data Entry screen. Please select a milestone to edit.");
                }
            };
        }
    }

    private void DoLookup(object editor, object? item)
    {
        if (_selectedType == null)
            return;

        if (editor is CodeEditorControl ce)
        {
            Dictionary<string, string>? filter = null;
            if (ce.Value != null)
            {
                filter = new Dictionary<string, string>
                {
                    [ce.ColumnName] = ce.Value
                };
            }

            Type? gridType = null;
            if (_selectedType == typeof(JobDocumentSetMileStone))
            {
                gridType = typeof(JobDocumentSetMileStoneDataEntryPopupGrid);
            }

            var popup = new PopupList(_selectedType, _entityID, Array.Empty<string>(), filter, gridType: gridType);

            popup.OnDefineFilter += LookupFactory.DefineFilter;

            if (popup.ShowDialog() == true)
            {
                _entityID = popup.ID;
                Select(_selectedType, _entityID);
            }
        }
    }


    private void SaveDocument(DataEntryDocument dataEntryDocument)
    {
        var doctype = CoreUtils.TypeList(x =>
        {
            var entityDoc = x.GetInterfaceDefinition(typeof(IEntityDocument<>));
            if (entityDoc is null)
            {
                return false;
            }
            var linkType = entityDoc.GenericTypeArguments[0].GetInterfaceDefinition(typeof(IEntityLink<>));
            if (linkType is null)
            {
                return false;
            }
            return linkType.GenericTypeArguments[0] == _selectedType;
        }).FirstOrDefault();
        if(doctype is null)
        {
            return;
        }

        var doc = (IEntityDocument)Activator.CreateInstance(doctype)!;
        CoreUtils.SetPropertyValue(doc, "EntityLink.ID", _entityID);
        doc.DocumentLink.ID = dataEntryDocument.Document.ID;
        doc.Thumbnail = dataEntryDocument.Thumbnail;
        ClientFactory.CreateClient(doctype).Save(doc,"Added from Data Entry Screen");

    }

    private void DoSave(bool markasprocessed)
    {
        var cancel = new System.ComponentModel.CancelEventArgs();
        if (markasprocessed && (_entity is IDataEntryInstance scannable))
            scannable.DataEntered = DateTime.Now;
        Editor.SaveItem(cancel);

        if (!cancel.Cancel)
        {
            _originalID = _entityID;
            _entityID = _entity.ID;
            IsChanged = false;
            var row = _documents._dataEntryGrid.SelectedRows.FirstOrDefault();
            if (row != null)
            {
                var scan = row.ToObject<DataEntryDocument>();
                scan.EntityID = _entity.ID;
                if (markasprocessed)
                {
                    SaveDocument(scan);
                    scan.Archived = DateTime.Now;
                }

                if (scan.IsChanged())
                {
                    new Client<DataEntryDocument>().Save(scan, "Updated from Data Entry Screen");
                    _documents.Refresh();
                }
                
            }
        }
    }

    private void PopulateEditor()
    {
        if (_selectedType == null)
            return;

        _entity = null;
        if (_entityID != Guid.Empty)
        {
            _entity = Client.Create(_selectedType)
                .Query(
                    Filter.Create<Entity>(_selectedType, x => x.ID).IsEqualTo(_entityID),
                    _grid.LoadEditorColumns()
                )
                .ToObjects(_selectedType)
                .OfType<Entity>()
                .FirstOrDefault();
        }
        _entity ??= Activator.CreateInstance(_selectedType) as Entity;
        if (_entity == null)
            return;
        _grid?.InitialiseEditorForm(Editor, new object[] { _entity }, null, true);
        
        _process = new Button()
        {
            Content = "Mark as Processed",
            BorderBrush = new SolidColorBrush(Colors.DarkBlue),
            Background = new SolidColorBrush(Colors.DodgerBlue),
            Margin = new Thickness(0, 0, 5, 0),
            Padding = new Thickness(10, 0, 10, 0),
            IsEnabled = _processenabled
        };
        _process.Click += (sender, args) =>
        {
            if (Editor.Validate())
            {
                DoSave(true);
            }
        };
        Editor.AddButton(_process);
        IsChanged = false;

        if (_selectedType == typeof(JobDocumentSetMileStone))
        {
            var disabled = _entityID == Guid.Empty;
            foreach (var page in Editor.Pages)
            {
                if (page is DynamicEditorGrid.DynamicEditPage editPage)
                {
                    foreach (var editor in editPage.Editors)
                    {
                        if (editor.EditorDefinition is not BaseCodeEditor)
                        {
                            editor.IsEnabled = !disabled && editor.EditorDefinition.Editable.IsEditable();
                        }
                    }
                }
                else
                {
                    page.ReadOnly = disabled;
                }
            }
        }
    }

    private void _panel_OnOnChanged(object sender, DynamicSplitPanelSettings e)
    {
        _settings.PreviewWidth = e.AnchorWidth;
        new UserConfiguration<DataEntryPanelSettings>().Save(_settings);
    }
}