using ComPDFKit.PDFDocument;
using ComPDFKit.PDFPage;
using ComPDFKitViewer.PdfViewer;
using Microsoft.Win32;
using PDF_Master.CustomControl;
using PDF_Master.Helper;
using PDF_Master.Model;
using PDF_Master.Model.Dialog.ToolsDialogs;
using PDF_Master.Views.Dialog;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using static PDF_Master.Model.Dialog.ToolsDialogs.SaftyDialogs.DeleteSafetySettintgsModel;

namespace PDF_Master.ViewModels.Dialog.ToolsDialogs
{
    class MergeDialogViewModel : BindableBase, IDialogAware
    {
        enum PageSizeType
        {
            kDefault = 0,
            A4 = 1,
            A3 = 2,
            Letter = 3,
            Legal = 4,
            Customized = 5,
        }
        string CurrentFilePath = "";

        #region 框架内容

        public string Title => "";

        public event Action<IDialogResult> RequestClose;

        public bool CanCloseDialog()
        {
            return true;
        }

        public void OnDialogClosed()
        {

        }

        public void OnDialogOpened(IDialogParameters parameters)
        {
            CPDFViewer pdfViewer = null;
            parameters.TryGetValue<CPDFViewer>(ParameterNames.PDFViewer, out pdfViewer);
            if (pdfViewer != null)
            {
                CurrentFilePath = pdfViewer.Document.FilePath;

                List<string> list = new List<string>();
                list.Add(CurrentFilePath);
                AddFiles(list.ToArray());
            }

            string[] Paths;
            parameters.TryGetValue<string[]>(ParameterNames.FilePath, out Paths);
            if (Paths != null)
            {
                AddFiles(Paths);
            }
        }

        #endregion
        #region 定义与初始化

        public ObservableCollection<MergeObject> MergeObjectlist { get; set; }

        public DelegateCommand CancelCommand { get; set; }
        public DelegateCommand MergeCommand { get; set; }
        public DelegateCommand<object> AddFilesCommand { get; set; }
        public DelegateCommand ClearCommand { get; set; }
        public DelegateCommand<object> SetPageSizeTypeCommand { get; set; }

        public IDialogService dialogs;

        private PageSizeType pageSizeType = PageSizeType.kDefault;

        private string inputWidth;

        public string InputWidth
        {
            get { return inputWidth; }
            set
            {
                SetProperty(ref inputWidth, value);
            }
        }

        private string inputHeight;

        public string InputHeight
        {
            get { return inputHeight; }
            set
            {
                SetProperty(ref inputHeight, value);
            }
        }
        private int comboBoxSelectedIndex=0;

        public int ComboBoxSelectedIndex
        {
            get { return comboBoxSelectedIndex; }
            set
            {
                SetProperty(ref comboBoxSelectedIndex, value);
            }
        }


        public MergeDialogViewModel(IDialogService dialogService)
        {
            dialogs = dialogService;
            MergeObjectlist = new ObservableCollection<MergeObject>();
            CancelCommand = new DelegateCommand(Cancel);
            AddFilesCommand = new DelegateCommand<object>(ButtonAddFiles);
            MergeCommand = new DelegateCommand(Merge);
            ClearCommand = new DelegateCommand(Clear);
            SetPageSizeTypeCommand = new DelegateCommand<object>(SetPageSizeType);
        }

        #endregion

        #region 私有方法

        private void UpDataMergeObjectIndex()
        {
            for (int i = 0; i < MergeObjectlist.Count; i++)
            {
                MergeObjectlist[i].ItemIndex = i + 1;
            }
        }

        private void Cancel()
        {
            Clear();
            RequestClose.Invoke(new DialogResult(ButtonResult.Cancel));
        }

        public void ButtonAddFiles(object data)
        {
            int index = Convert.ToInt32(data);
            switch (index)
            {
                case 0:
                    //打开文件
                    ComboBoxSelectedIndex = 0;//打开文件弹窗会影响UI更新，所以手动更新
                    AddFiles(OpenFile());
                    break;
                case 1:
                    //打开文件夹
                    ComboBoxSelectedIndex = 1;//打开文件夹弹窗会影响UI更新，所以手动更新
                    AddFiles(OpenFileFolder());
                    break;
                case 2:
                    //打开当前文件
                    List<string> list = new List<string>();

                    for (int i = 0; i < App.OpenedFileList.Count; i++)
                    {
                        list.Add(App.OpenedFileList[i]);
                    }
                    AddFiles(list.ToArray());
                    break;
                default:
                    break;
            }
        }

        private string[] OpenFileFolder()
        {
            System.Windows.Forms.FolderBrowserDialog openFile = new System.Windows.Forms.FolderBrowserDialog();
            if (openFile.ShowDialog() == System.Windows.Forms.DialogResult.Cancel)
            {
                return null;
            }
            DirectoryInfo tempfolder = new DirectoryInfo(openFile.SelectedPath);
            FileInfo[] fileInfos = tempfolder.GetFiles();
            List<string> list = new List<string>();
            foreach (FileInfo item in fileInfos)
            {
                list.Add(item.FullName);
            }
            return list.ToArray();
        }
        private string[] OpenFile()
        {
            OpenFileDialog openFile = new OpenFileDialog();
            openFile.Multiselect = true;
            openFile.Filter = Properties.Resources.imageex.ToLower()+"|*";
            if (openFile.ShowDialog() == false)
            {
                return null;
            }
            return openFile.FileNames;
        }

        private void Merge()
        {
            //付费锁
            if (!App.IsLogin)
            {
                dialogs.ShowDialog(DialogNames.IAPCompareDialog);
                return;
            }
            bool result = true;
            CPDFDocument SaveDoc = CPDFDocument.CreateDocument();
            for (int i = 0; i < MergeObjectlist.Count; i++)
            {
                //图片
                if (Path.GetExtension(MergeObjectlist[i].FilePath).Trim().ToLower() != ".pdf")
                {
                    BitmapSource frame = MergeObjectlist[i].DocThumbnail;
                    byte[] imageData = new byte[frame.PixelWidth * frame.PixelHeight * 4];
                    if (frame.Format != PixelFormats.Bgra32)
                    {
                        FormatConvertedBitmap covert = new FormatConvertedBitmap(frame, PixelFormats.Bgra32, frame.Palette, 0);
                        covert.CopyPixels(imageData, frame.PixelWidth * 4, 0);
                    }
                    else
                    {
                        frame.CopyPixels(imageData, frame.PixelWidth * 4, 0);
                    }
                    frame.CopyPixels(imageData, frame.PixelWidth * 4, 0);
                    result = SaveDoc.InsertPage(0, frame.PixelWidth, frame.PixelHeight, imageData, CPDFDocumentImageMode.CPDFDocumentImageModeScaleToFill);
                    if (!result)
                    {
                        SaveDoc.Release();
                        return;
                    }
                    continue;
                }
                else
                {
                    CPDFDocument tempDoc = CPDFDocument.InitWithFilePath(MergeObjectlist[i].FilePath);
                    if (!string.IsNullOrEmpty(MergeObjectlist[i].Password))
                    {
                        tempDoc.UnlockWithPassword(MergeObjectlist[i].Password);
                    }
                    if (!string.IsNullOrEmpty(MergeObjectlist[i].SetPageRangeStr))
                    {
                        result = SaveDoc.ImportPages(tempDoc, MergeObjectlist[i].SetPageRangeStr);
                    }
                    else
                    {
                        //下拉框控件传出来的list是页面索引集合，
                        //此处传给SDK的合并接口的是页码集合，因此需要将集合项遍历+1，只有合并接口是接收页码集合，其余接口是接受页面索引集合
                        List<int> pageIndexs = new List<int>();
                        for(int j=0;j< MergeObjectlist[i].SetPageRange.Count; j++)
                        {
                            pageIndexs.Add(MergeObjectlist[i].SetPageRange[j]+1);
                        }
                        result = SaveDoc.ImportPages(tempDoc, CommonHelper.GetPageParmFromList(pageIndexs));
                    }
                    if (!result)
                    {
                        SaveDoc.Release();
                        tempDoc.Release();
                        return;
                    }
                    tempDoc.Release();
                }
            }

            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.FileName = "Untitle";
            saveFileDialog.Filter = "PDF|*.pdf;";
            if (saveFileDialog.ShowDialog() == false)
            {
                return;
            }
            string path = saveFileDialog.FileName;

            System.Windows.Rect rect = new System.Windows.Rect();

            switch (pageSizeType)
            {
                case PageSizeType.kDefault:
                    break;
                case PageSizeType.A4:

                    rect.Width = CommonHelper.GetPageSizeFomrUnit(210);
                    rect.Height = CommonHelper.GetPageSizeFomrUnit(297);
                    break;
                case PageSizeType.A3:
                    rect.Width = CommonHelper.GetPageSizeFomrUnit(297);
                    rect.Height = CommonHelper.GetPageSizeFomrUnit(420);
                    break;
                case PageSizeType.Letter:
                    rect.Width = CommonHelper.GetPageSizeFomrUnit(216);
                    rect.Height = CommonHelper.GetPageSizeFomrUnit(279);
                    break;
                case PageSizeType.Legal:
                    rect.Width = CommonHelper.GetPageSizeFomrUnit(216);
                    rect.Height = CommonHelper.GetPageSizeFomrUnit(356);
                    break;
                case PageSizeType.Customized:
                    if (!string.IsNullOrEmpty(InputWidth) && !string.IsNullOrEmpty(InputHeight))
                    {
                        rect.Width = CommonHelper.GetPageSizeFomrUnit(Convert.ToInt32(InputWidth));
                        rect.Height = CommonHelper.GetPageSizeFomrUnit(Convert.ToInt32(InputHeight));
                    }
                    else
                    {
                        rect.Width = CommonHelper.GetPageSizeFomrUnit(595);
                        rect.Height = CommonHelper.GetPageSizeFomrUnit(841);
                    }
                    break;
                default:
                    break;
            }
            if (rect.Width > 0 && rect.Height > 0)
            {
                //裁剪
                for (int i = 0; i < SaveDoc.PageCount; i++)
                {
                    CPDFPage page = SaveDoc.PageAtIndex(i);
                    page.CropPage(CPDFDisplayBox.MediaBox, rect);
                }
            }

            bool saveResult = SaveDoc.WriteToFilePath(path);
            SaveDoc.Release();
            CommonHelper.ShowFileBrowser(path);
            DialogParameters valuePairs = new DialogParameters();
            valuePairs.Add(ParameterNames.FilePath, path);
            RequestClose.Invoke(new DialogResult(ButtonResult.OK, valuePairs));
        }

        private void Clear()
        {
            MergeObjectlist.Clear();
        }

        private void SetPageSizeType(object button)
        {
            if (button is RadioButton)
            {
                pageSizeType = (PageSizeType)Convert.ToInt32((button as RadioButton).Tag);
            }
        }

        #endregion

        #region 公开方法

        public void DeleteItem(MergeObject merge)
        {
            MergeObjectlist.Remove(merge);
            UpDataMergeObjectIndex();
        }

        /// <summary>
        /// 拖拽插入
        /// </summary>
        public void MoveMerge(MergeObject targetNode, MergeObject soureNode)
        {
            int targetindex = MergeObjectlist.IndexOf(targetNode);
            MergeObjectlist.Remove(soureNode);
            if (targetNode.IsForward)
            {
                if (targetindex + 1 < MergeObjectlist.Count)
                {
                    MergeObjectlist.Insert(targetindex + 1, soureNode);
                }
                else
                {
                    MergeObjectlist.Add(soureNode);
                }
            }
            else
            {
                MergeObjectlist.Insert(targetindex, soureNode);
            }
            UpDataMergeObjectIndex();
        }

        public void AddFiles(string[] FilePath)
        {
            if (FilePath == null)
            {
                return;
            }
            bool showDialog = false;
            for (int i = 0; i < FilePath.Length; i++)
            {
                MergeObject mergeObject = new MergeObject();
                mergeObject.FilePath = FilePath[i];

                //通过路径判断文件是否已添加
                bool IsExists = false;
                for (int j = 0; j < MergeObjectlist.Count; j++)
                {
                    if (MergeObjectlist[j].FilePath == mergeObject.FilePath)
                    {
                        IsExists = true;
                    }
                }
                if (IsExists)
                {
                    continue;
                }
                string FileType = Path.GetExtension(mergeObject.FilePath).Trim().ToLower();
                if (string.IsNullOrEmpty(FileType))
                {
                    showDialog = true;
                    //获取不到文件类型
                    continue;
                }
                if (FileType != ".pdf")
                {
                    string imagetype = "*" + FileType;
                    string[] x = Properties.Resources.imageex.ToLower().Split(';');
                    List<string> list = x.ToList();
                    int imageindex = list.IndexOf(imagetype);
                    if (imageindex < 0)
                    {
                        showDialog = true;
                        //图片格式不支持
                        continue;
                    };

                    mergeObject.DocName = Path.GetFileName(mergeObject.FilePath);
                    mergeObject.DocPageCount = 1 + " " + App.MainPageLoader.GetString("Merge_ItemPages");
                    mergeObject.SDKPageCount = 1;
                    mergeObject.DocSize = CommonHelper.GetFileSize(mergeObject.FilePath);
                    try
                    {
                        mergeObject.DocThumbnail = new BitmapImage(new Uri(mergeObject.FilePath));
                    }
                    catch (Exception)
                    {
                        showDialog = true;
                        //解码错误
                        continue;
                    }
                }
                else
                {
                    CPDFDocument doc = CPDFDocument.InitWithFilePath(mergeObject.FilePath);
                    if (doc == null)
                    {
                        showDialog = true;
                        //PDF打开失败
                        continue;
                    }
                    VerifyPasswordResult condition = SecurityHelper.VerifyPasswordByPasswordKind(doc, EnumPasswordKind.StatusPermissionsPassword, dialogs);
                    if (condition.IsDiscryptied)
                    {
                        if (condition.Password != null)
                        {
                            mergeObject.Password = condition.Password;
                            doc.UnlockWithPassword(condition.Password);
                        }
                    }
                    else
                    {
                        doc.Release();
                        continue;
                    }
                    mergeObject.DocName = doc.FileName;
                    mergeObject.DocPageCount = doc.PageCount.ToString() +" "+ App.MainPageLoader.GetString("Merge_ItemPages");
                    mergeObject.SDKPageCount = doc.PageCount;
                    mergeObject.DocSize = CommonHelper.GetFileSize(mergeObject.FilePath);

                    //获取第一页缩略图
                    CPDFPage page = doc.PageAtIndex(0);
                    Size size = doc.GetPageSize(0);

                    byte[] bmpData = new byte[(int)(size.Width * size.Height * 4)];
                    WriteableBitmap WirteBitmap = new WriteableBitmap((int)size.Width, (int)size.Height, 96, 96, PixelFormats.Bgra32, null);
                    page.RenderPageBitmap(0, 0, (int)size.Width, (int)size.Height, 0xFFFFFFFF, bmpData, 1);
                    WirteBitmap.WritePixels(new Int32Rect(0, 0, (int)size.Width, (int)size.Height), bmpData, WirteBitmap.BackBufferStride, 0);
                    WirteBitmap.Freeze();
                    mergeObject.DocThumbnail = WirteBitmap;

                    doc.Release();
                }
                MergeObjectlist.Add(mergeObject);
                UpDataMergeObjectIndex();
            }

            if (showDialog)
            {
                AlertsMessage alertsMessage = new AlertsMessage();
                alertsMessage.ShowDialog("", "The file was not added successfully, please select the file again.", "OK");
                if (alertsMessage.result == ContentResult.Ok)
                {
                }
            }
        }
        #endregion
    }
}