using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using Syncfusion.Pdf.Graphics;
using Syncfusion.Pdf.Parsing;
using Syncfusion.Pdf;
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.Media;
using System.Windows.Media.Imaging;
using InABox.DynamicGrid;
using InABox.WPF;
using InABox.Wpf;
using Encoder = System.Drawing.Imaging.Encoder;
using Path = System.IO.Path;
using Image = System.Windows.Controls.Image;
using System.ComponentModel;
using System.Windows.Controls;
using Clipboard = System.Windows.Clipboard;
using DataFormats = System.Windows.DataFormats;
using DragDropEffects = System.Windows.DragDropEffects;
using DragEventArgs = System.Windows.DragEventArgs;
using MessageBox = System.Windows.MessageBox;
using UserControl = System.Windows.Controls.UserControl;
using InABox.Wpf;
using System.Collections.ObjectModel;
using System.Windows.Data;
using PRSDesktop.Panels.DataEntry;
using InABox.Wpf.Editors;
using System.Timers;
using Microsoft.Win32;
using javax.xml.crypto;

namespace PRSDesktop;

public static class PDFExtensions
{
    public static IEnumerable<PdfPageBase> GetPages(this PdfDocumentBase doc)
    {
        if (doc is PdfLoadedDocument lDoc)
            return lDoc.Pages.Cast<PdfPageBase>();
        if (doc is PdfDocument pdfDoc)
            return pdfDoc.Pages.Cast<PdfPageBase>();
        throw new Exception($"Unsupported PDF Document type {doc.GetType()}");
    }
    public static PdfPageBase GetPage(this PdfDocumentBase doc, int index)
    {
        if (doc is PdfLoadedDocument lDoc)
            return lDoc.Pages[index];
        if (doc is PdfDocument pdfDoc)
            return pdfDoc.Pages[index];
        throw new Exception($"Unsupported PDF Document type {doc.GetType()}");
    }
    public static int PageCount(this PdfDocumentBase doc)
    {
        if (doc is PdfLoadedDocument lDoc)
            return lDoc.Pages.Count;
        if (doc is PdfDocument pdfDoc)
            return pdfDoc.Pages.Count;
        throw new Exception($"Unsupported PDF Document type {doc.GetType()}");
    }
    public static PdfLoadedDocument AsLoadedDocument(this PdfDocumentBase doc)
    {
        if (doc is PdfLoadedDocument lDoc)
            return lDoc;
        if (doc is PdfDocument pdfDoc)
        {
            using var ms = new MemoryStream();
            pdfDoc.Save(ms);
            var array = ms.ToArray();
            return new PdfLoadedDocument(array);
        }
        throw new Exception($"Unsupported PDF Document type {doc.GetType()}");
    }

    public static byte[] SaveToBytes(this PdfDocumentBase doc)
    {
        using var ms = new MemoryStream();
        doc.Save(ms);
        return ms.ToArray();
    }
}

/// <summary>
/// Interaction logic for ScanPanel.xaml
/// </summary>
public partial class DataEntryList : UserControl, ICorePanel, IDockPanel
{
    private List<DataEntryDocument> SelectedScans = new();

    public delegate void DateEntrySelectionHandler(String appliesTo, Guid entityID, bool allowprocess);

    public event DateEntrySelectionHandler? SelectionChanged;

    public DataEntryList()
    {

        InitializeComponent();
    }

    #region Panel

    public void Setup()
    {
        _dataEntryGrid.HiddenColumns.Add(x => x.Document.ID);
        _dataEntryGrid.Refresh(true, false);
        _historyGrid.Refresh(true, false);
    }

    public void Refresh()
    {
        if (_pages.SelectedIndex == 0)
            _dataEntryGrid.Refresh(false, true);
        else if (_pages.SelectedIndex == 1)
            _historyGrid.Refresh(false,true);
            
    }

    public void Shutdown(CancelEventArgs? cancel)
    {
        ViewList.CloseImageWindows();
    }

    #endregion

    #region Uploading

    private static byte[] RenderData(ref string filename, byte[] data)
    {
        var extension = Path.GetExtension(filename).ToLower();
        if ((extension == ".jpg" || extension == ".jpeg" || extension == ".png" || extension == ".bmp") && ImageUtils.TryGetImageType(data, out var format))
        {
            return data;
        }
        else if (extension == ".pdf")
        {
            return data;
        }
        else
        {
            using var stream = new MemoryStream(data);
            filename = Path.ChangeExtension(filename, "pdf");
            return DataEntryReGroupWindow.RenderToPDF(filename, stream).SaveToBytes();
        }
        throw new Exception("Could not render file to PDF");
    }

    private void DynamicTabItem_Drop(object sender, DragEventArgs e)
    {
        Task.Run(() =>
        {
            Dispatcher.Invoke(() =>
            {
                Progress.Show("Uploading documents");
                try
                {
                    var result = DocumentUtils.HandleFileDrop(e);
                    if (result is not null)
                    {
                        foreach (var (filename, stream) in result)
                        {
                            var newFilename = filename;
                            byte[] data;
                            if (stream is null)
                            {
                                data = File.ReadAllBytes(newFilename);
                            }
                            else
                            {
                                using var memStream = new MemoryStream();
                                stream.CopyTo(memStream);
                                data = memStream.ToArray();
                            }
                            data = RenderData(ref newFilename, data);

                            _dataEntryGrid.UploadDocument(newFilename, data, Guid.Empty);
                        }
                    }
                    Progress.Close();
                }
                catch (Exception e)
                {
                    Progress.Close();
                    MessageWindow.ShowError("Could not upload documents.", e);
                }
            });
        });
    }

    private void DynamicTabItem_DragOver(object sender, DragEventArgs e)
    {
        if (e.Data.GetDataPresent(DataFormats.FileDrop) || e.Data.GetDataPresent("FileGroupDescriptor"))
        {
            e.Effects = DragDropEffects.Copy;
        }
        else
        {
            e.Effects = DragDropEffects.None;
        }
        e.Handled = true;
    }

    #endregion

    private void _documents_OnSelectItem(object sender, DynamicGridSelectionEventArgs e)
    {
        ViewList.Documents = _dataEntryGrid.SelectedRows.ToArray(x => x.ToObject<DataEntryDocument>());

        DoSelect(e.Rows);
    }

    private void DoSelect(CoreRow[]? rows)
    {
        var appliesTo = rows?.Length == 1
            ? rows[0].Get<DataEntryDocument, string>(x => x.Tag.AppliesTo)
            : "";
        var entityid = rows?.Length == 1
            ? rows[0].Get<DataEntryDocument, Guid>(x => x.EntityID)
            : Guid.Empty;
        var archived = rows?.Length == 1
            ? rows[0].Get<DataEntryDocument, DateTime>(x => x.Archived)
            : DateTime.MinValue;
        SelectionChanged?.Invoke(appliesTo, entityid, archived.IsEmpty());

        ViewList.CloseImageWindows();
    }

    private void _historyGrid_OnOnSelectItem(object sender, DynamicGridSelectionEventArgs e)
    {
        DoSelect(e.Rows);
    }

    private List<DataEntryTag>? _tags;

    private void _uploadMenu_OnOpened(object sender, RoutedEventArgs e)
    {
        _uploadMenu.Items.Clear();

        _uploadMenu.AddItem("Load from File", null, _addItem_OnClick);
        if (Clipboard.ContainsText())
        {
            _uploadMenu.AddItem("Paste Text from Clipboard", null, _pasteItem_OnClick);
        }
        else if (Clipboard.ContainsImage())
        {
            _uploadMenu.AddItem("Paste Image from Clipboard", null, _pasteItem_OnClick);
        }
        else if (Clipboard.ContainsFileDropList())
        {
            int count = CheckAllowableFiles();
            if (count > 0)
            {
                _uploadMenu.AddItem($@"Paste {count} File{(count > 1 ? "s" : "")} from Clipboard", null, _pasteItem_OnClick);
            }
        }
        _uploadMenu.AddSeparatorIfNeeded();
        if(_dataEntryGrid.SelectedRows.Length > 0)
        {
            if (Security.CanEdit<DataEntryDocument>())
            {
                if (Security.IsAllowed<CanSetupDataEntryTags>())
                {
                    _tags ??= DataEntryGrid.GetVisibleTagList();
                    if(_tags.Count > 0)
                    {
                        var changeTag = _uploadMenu.AddItem("Set Tag", null, null);
                        foreach(var tag in _tags)
                        {
                            changeTag.AddItem(tag.Name, null, tag, ChangeTag);
                        }
                        changeTag.AddSeparatorIfNeeded();
                        changeTag.AddItem<DataEntryTag?>("Clear Tags", null, null, ChangeTag);
                    }
                }
                _uploadMenu.AddItem("Set Note", null, _dataEntryGrid.SelectedRows, _changeNote_Click);
                _uploadMenu.AddSeparator();
                _uploadMenu.AddItem("Archive", null, _remove_OnClick);
                _uploadMenu.AddItem("Edit", null, _dataEntryGrid.SelectedRows, EditItem_Click);
            }
            if (Security.CanDelete<DataEntryDocument>())
            {
                _uploadMenu.AddItem("Delete", null, _dataEntryGrid.SelectedRows, DeleteItem_Click);
            }
        }

        _uploadMenu.RemoveUnnecessarySeparators();
    }

    private void DeleteItem_Click(CoreRow[] obj)
    {
        _dataEntryGrid.DeleteItems(obj);
        _dataEntryGrid.Refresh(false, true);
    }

    private void EditItem_Click(CoreRow[] rows)
    {
        var items = _dataEntryGrid.LoadItems(rows);
        if (_dataEntryGrid.EditItems(items))
        {
            _dataEntryGrid.Refresh(false, true);
        }
    }

    private void ChangeTag(DataEntryTag? obj)
    {
        _dataEntryGrid.DoChangeTags(obj?.ID ?? Guid.Empty);
    }

    private void _addItem_OnClick()
    {
        var ofd = new OpenFileDialog()
        {
            Filter = @"All Files (*.pdf, *.bmp, *.png, *.jpg, *.jpeg)|*.pdf;*.bmp;*.png;*.jpg;*.jpeg",
            Multiselect = true,
            Title = @"Select Files to Upload",
            InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
        };
        if (ofd.ShowDialog() == true)
        {
            foreach (var file in ofd.FileNames)
                Upload(
                    Path.GetFileName(file),
                    new FileStream(file,FileMode.Open));
        }
    }

    private void _pasteItem_OnClick()
    {
        if (Clipboard.ContainsText())
        {
            Upload(
                $"Pasted Text {DateTime.Now:yyyy-MM-dd hh-mm-ss-fff}.txt",
                new MemoryStream(new UTF8Encoding().GetBytes(Clipboard.GetText()))
            );
        }
        else if (Clipboard.ContainsImage())
        {
            var img = Clipboard.GetImage();
            if (img != null)
            {
                var bmp = ImageUtils.BitmapSourceToBitmap(img);
                using (var ms = new MemoryStream())
                {
                    bmp.Save(ms, ImageFormat.Png);
                    Upload(
                        $"Pasted Image {DateTime.Now:yyyy-MM-dd hh-mm-ss-fff}.png",
                        ms
                    );
                }
            }
            
        }
        else if (CheckAllowableFiles() > 0)
        {
            var files = Clipboard.GetFileDropList().OfType<String>().ToArray();
            foreach (var file in files)
            {
                Upload(
                    Path.GetFileName(file), 
                    new FileStream(file,FileMode.Open)
                );
            }
        }
    }

    private void Upload(string filename, Stream data)
    {
        var doc = DataEntryReGroupWindow.RenderToPDF(filename, data);
        _dataEntryGrid.UploadDocument(Path.ChangeExtension(filename,"pdf"), doc.SaveToBytes(), Guid.Empty);
    }
    
    private static int CheckAllowableFiles()
    {
        var extensions = Clipboard.GetFileDropList().OfType<String>().Select(x => Path.GetExtension(x.ToUpper())).ToArray();
        return extensions.Count(x => 
            String.Equals(x, "PDF")
            || String.Equals(x, "PNG")
            || String.Equals(x, "JPG")
            || String.Equals(x, "JPEG")
            || String.Equals(x, "BMP")
            || String.Equals(x, "TXT")
        );
    }
    
    private void _pages_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (_pages.SelectedIndex == 0)
            _dataEntryGrid.Refresh(false,true);
        else if (_pages.SelectedIndex == 1)
            _historyGrid.Refresh(false,true);
    }

    private void _remove_OnClick()
    {
        _dataEntryGrid.DoRemove();
    }

    private void _reopen_OnClick(object sender, RoutedEventArgs e)
    {
        _historyGrid.DoReopen();
    }

    private void _changeNote_Click(CoreRow[] rows)
    {
        var notes = rows.ToObjects<DataEntryDocument>().Select(x => x.Note).Distinct().ToArray();

        var note = notes.Length == 1 ? notes[0] : "";

        if(TextBoxDialog.Execute("Enter note:", ref note))
        {
            _dataEntryGrid.DoChangeNote(note);
        }
    }

    private void _dataEntryGrid_OnContextMenuOpening(object sender, ContextMenuEventArgs e)
    {

    }

    private void ViewList_Explode()
    {
        _dataEntryGrid.DoExplode();
    }

    private void ViewList_ExplodeAll()
    {
        _dataEntryGrid.DoExplodeAll();
    }

    private void ViewList_UpdateDocument(DataEntryDocument document, Document doc)
    {
        if (Path.GetExtension(doc.FileName) == ".pdf")
        {
            document.Thumbnail = ImageUtils.GetPDFThumbnail(doc.Data, 256, 256);
        }

        Client.Save(document, "");

        DataEntryCache.Cache.Add(new DocumentCachedDocument(doc));

        ViewList.UpdateViewList(_dataEntryGrid.SelectedRows.ToArray(x => x.ToObject<DataEntryDocument>()), true);
    }
}