using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using Syncfusion.SfPdfViewer.XForms;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Xamarin.Essentials;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using XF.Material.Forms.UI.Dialogs;
using Document = InABox.Core.Document;
using PRSSecurity = InABox.Core.Security;

namespace comal.timesheets
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class PDFList : ContentPage
    {
        List<DocShell> pDFShells = new List<DocShell>();
        bool bAllowPrintShare;
        bool bAllowDelete;
        bool bAllowView = true;
        Entity Entity;
        DeviceIdiom DeviceIdiom;

        //allowing of print/share is disabled by default
        //allowing of upload is disabled by default
        public PDFList(Dictionary<string, Guid> fileNameIDs, bool allowprintshare = false)
        {
            InitializeComponent();
            NavigationPage.SetHasBackButton(this, false);
            bAllowPrintShare = allowprintshare;
            LoadScreen(fileNameIDs);
        }

        //2nd constructor requires an entity for uploading of files or deleting (if allowed)
        public PDFList(Dictionary<string, Guid> fileNameIDs, Entity entity, bool allowprintshare = false, bool allowUpload = false, bool allowDelete = false, bool allowView = true)
        {
            InitializeComponent();
            NavigationPage.SetHasBackButton(this, false);
            bAllowPrintShare = allowprintshare;
            Entity = entity;
            if (allowUpload)
                uploadBtn.IsVisible = true;
            bAllowDelete = allowDelete;
            bAllowView = allowView;
            LoadScreen(fileNameIDs);
        }

        //standard load
        private void LoadScreen(Dictionary<string, Guid> fileNameIDs)
        {
            foreach (KeyValuePair<string, Guid> pair in fileNameIDs)
            {
                DocShell shell = new DocShell();
                shell.FileName = pair.Key;
                shell.DocID = pair.Value;
                shell = AssignIcon(shell);
                pDFShells.Add(shell);
            }
            pdfListView.ItemsSource = pDFShells;
        }

        private DocShell AssignThumbnail(DocShell shell)
        {
            shell.ImageRow = 0;
            shell.ImageRowSpan = 2;
            shell.ImageSource = ImageSource.FromStream(() => new MemoryStream(shell.ThumbNail));
            shell.TypeColumn = 1;
            shell.TypeColumnSpan = 1;
            if (DeviceIdiom == DeviceIdiom.Tablet)
            {
                shell.ImageHeightRequest = 300;
                shell.ImageWidthRequest = 400;
                shell.ColumnWidth = 400;
            }
            else
            {
                shell.ImageHeightRequest = 150;
                shell.ImageWidthRequest = 200;
                shell.ColumnWidth = 200;
                shell.ExpandVisible = true;
            }
            return shell;
        }


        private DocShell AssignIcon(DocShell shell)
        {
            if (shell.FileName.ToLower().EndsWith("pdf"))
                shell.ImageSource = "pdficon.png";
            else if (shell.FileName.ToLower().EndsWith("docx") || shell.FileName.ToLower().EndsWith("doc"))
                shell.ImageSource = "worddoc.png";
            else if (shell.FileName.ToLower().EndsWith("png") || shell.FileName.ToLower().EndsWith("jpg"))
                shell.ImageSource = "productimage.png";
            return shell;
        }

        private void ExpandImage_Tapped(object sender, EventArgs e)
        {
            var item = ((TappedEventArgs)e).Parameter as DocShell;
            if (item == null)
                return;
        }

        void ExitBtn_Clicked(object sender, EventArgs e)
        {
            Navigation.PopAsync();
        }

        private async void Upload_Clicked(object sender, EventArgs e)
        {
            var result = await FilePicker.PickAsync(new PickOptions { FileTypes = FilePickerFileType.Pdf });
            if (result != null)
            {
                using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Saving"))
                {
                    string fileName = $"File Name: {result.FileName}";
                    var stream = await result.OpenReadAsync();
                    var memoryStream = new MemoryStream();
                    stream.CopyTo(memoryStream);
                    var data = memoryStream.ToArray();
                    var doc = new Document { FileName = fileName, Data = data };
                    new Client<Document>().Save(doc, "Uploaded from mobile device");
                    pDFShells.Add(new DocShell { FileName = fileName, DocID = doc.ID });
                    pdfListView.ItemsSource = null;
                    pdfListView.ItemsSource = pDFShells;
                    SaveEntityDoc(doc.ID);
                }
            }
        }

        private void SaveEntityDoc(Guid docID)
        {
            if (Entity is EmployeeQualification)
            {
                EmployeeQualificationDocument empDoc = new EmployeeQualificationDocument();
                empDoc.DocumentLink.ID = docID;
                empDoc.EntityLink.ID = Entity.ID;
                new Client<EmployeeQualificationDocument>().Save(empDoc, "Upload from mobile device");
            }
            if (Entity is Notification)
            {
                NotificationDocument notificationDoc = new NotificationDocument();
                notificationDoc.DocumentLink.ID = docID;
                notificationDoc.EntityLink.ID = Entity.ID;
                new Client<NotificationDocument>().Save(notificationDoc, "Upload from mobile device");
            }
        }

        private async void List_Tapped(object sender, EventArgs e)
        {
            DocShell shell = pdfListView.SelectedItem as DocShell;
            if (!bAllowView)
            {
                DisplayAlert("Alert", "Opening is not allowed from this module", "OK");
                return;
            }

            if (bAllowDelete)
            {
                string chosenOption = await DisplayActionSheet("Choose an option", "Cancel", null, "View", "Delete File");
                switch (chosenOption)
                {
                    case "Cancel":
                        return;
                    default:
                        return;
                    case "View":
                        OpenDocViewer(shell);
                        break;
                    case "Delete File":
                        ConfirmDelete(shell);
                        break;
                }
            }
            else
            {
                OpenDocViewer(shell);
            }
        }

        private async void ConfirmDelete(DocShell shell)
        {
            string chosenOption = await DisplayActionSheet("Confirm Delete?", "Cancel", null, "Yes", "No");
            switch (chosenOption)
            {
                case "Cancel":
                    return;
                default:
                    return;
                case "No":
                    return;
                case "Yes":
                    using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Working"))
                    {
                        pDFShells.Remove(shell);
                        pdfListView.ItemsSource = null;
                        pdfListView.ItemsSource = pDFShells;
                        Document document = new Document { ID = shell.DocID };
                        DeleteEntityDocument(shell.DocID);
                        new Client<Document>().Delete(document, "Deleted from mobile device");
                    }
                    break;
            }
        }

        void DeleteEntityDocument(Guid id)
        {
            if (Entity is EmployeeQualification)
            {
                CoreTable table = new Client<EmployeeQualificationDocument>().Query(new Filter<EmployeeQualificationDocument>(x => x.DocumentLink.ID).IsEqualTo(id),
                    new Columns<EmployeeQualificationDocument>(x => x.ID));
                EmployeeQualificationDocument empDoc = new EmployeeQualificationDocument();
                empDoc.ID = Guid.Parse(table.Rows.First().Values[0].ToString());
                new Client<EmployeeQualificationDocument>().Delete(empDoc, "Deleted from mobile device");
            }
        }

        void OpenDocViewer(DocShell shell)
        {
            shell.FileName = shell.FileName.ToLower();
            if (shell.FileName.EndsWith("pdf"))
            {
                if (Device.RuntimePlatform.Equals(Device.Android) && PRSSecurity.IsAllowed<CanOpenMobileNativePDFViewer>())
                    OpenNativeViewer(shell);
                else
                {
                    PDFViewer viewer = new PDFViewer(shell.DocID, bAllowPrintShare);
                    Navigation.PushAsync(viewer);
                }
            }
            else if (shell.FileName.EndsWith("docx") || shell.FileName.EndsWith("doc"))
            {
                CoreTable table = new Client<Document>().Query(new Filter<Document>(x => x.ID).IsEqualTo(shell.DocID),
                    new Columns<Document>(x => x.Data));
                Document doc = table.Rows.First().ToObject<Document>();
                MemoryStream memoryStream = new MemoryStream(doc.Data);
                DisplayAlert("Error", "Word documents not available at this time", "OK");
            }
            else if (shell.FileName.EndsWith("png") || shell.FileName.EndsWith("jpg") || shell.FileName.EndsWith("jpeg"))
            {
                CoreTable table = new Client<Document>().Query(new Filter<Document>(x => x.ID).IsEqualTo(shell.DocID),
                        new Columns<Document>(x => x.Data));
                Document doc = table.Rows.First().ToObject<Document>();
                ImageSource src = ImageSource.FromStream(() => new MemoryStream(doc.Data));
                ImageViewer viewer = new ImageViewer(src);
                Navigation.PushAsync(viewer);
            }
        }

        private async void OpenNativeViewer(DocShell shell)
        {
            CoreTable table = new Client<Document>().Query(new Filter<Document>(x => x.ID).IsEqualTo(shell.DocID));
            Document doc = table.Rows.First().ToObject<Document>();

            var filePath = Path.Combine(FileSystem.AppDataDirectory, doc.FileName);

            File.WriteAllBytes(filePath, doc.Data);

            await Launcher.OpenAsync(new OpenFileRequest
            {
                File = new ReadOnlyFile(filePath)
            });
        }

        void SearchEnt_Changed(object sender, EventArgs e)
        {
            pdfListView.ItemsSource = pDFShells.Where(x =>
            x.FileName.Contains(searchEnt.Text) || x.FileName.Contains(searchEnt.Text.ToLower())
            || x.FileName.Contains(searchEnt.Text.ToUpper()) || x.FileName.Contains(UpperCaseFirst(searchEnt.Text))
                );
        }
        static String UpperCaseFirst(string s)
        {
            char[] a = s.ToCharArray();
            a[0] = char.ToUpper(a[0]);
            return new string(a);
        }
    }

    public class DocShell
    {
        public string FileName { get; set; }
        public Guid DocID { get; set; }
        public ImageSource ImageSource { get; set; }
        public double FirstRowHeight { get; set; }
        public string Type { get; set; }
        public double ImageHeightRequest { get; set; }
        public double ImageWidthRequest { get; set; }
        public double ColumnWidth { get; set; }
        public double ImageRow { get; set; }
        public double ImageRowSpan { get; set; }
        public byte[] ThumbNail { get; set; }
        public double TypeColumn { get; set; }
        public double TypeColumnSpan { get; set; }
        public string FileDetails { get; set; }
        public bool ExpandVisible { get; set; }
        public DocShell()
        {
            FileName = "";
            DocID = Guid.Empty;
            ImageSource = "";
            FirstRowHeight = 0;
            Type = "";
            ImageHeightRequest = 30;
            ImageWidthRequest = 30;
            ColumnWidth = 40;
            ImageRow = 1;
            ImageRowSpan = 1;
            TypeColumn = 0;
            TypeColumnSpan = 2;
            FileDetails = "";
            ExpandVisible = false;
        }
    }
}